summaryrefslogtreecommitdiff
path: root/src/screen.c
blob: 6a9f63248736432b68a86cb469e99595c6dcff80 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
4627
4628
4629
4630
4631
4632
4633
4634
4635
4636
4637
4638
4639
4640
4641
4642
4643
4644
4645
4646
4647
4648
4649
4650
4651
4652
4653
4654
4655
4656
4657
4658
4659
4660
4661
4662
4663
4664
4665
4666
4667
4668
4669
4670
4671
4672
4673
4674
4675
4676
4677
4678
4679
4680
4681
4682
4683
4684
4685
4686
4687
4688
4689
4690
4691
4692
4693
4694
4695
4696
4697
4698
4699
4700
4701
4702
4703
4704
4705
4706
4707
4708
4709
4710
4711
4712
4713
4714
4715
4716
4717
4718
4719
4720
4721
4722
4723
4724
4725
4726
4727
4728
4729
4730
4731
4732
4733
4734
4735
4736
4737
4738
4739
4740
4741
4742
4743
4744
4745
4746
4747
4748
4749
4750
4751
4752
4753
4754
4755
4756
4757
4758
4759
4760
4761
4762
4763
4764
4765
4766
4767
4768
4769
4770
4771
4772
4773
4774
4775
4776
4777
4778
4779
4780
4781
4782
4783
4784
4785
4786
4787
4788
4789
4790
4791
4792
4793
4794
4795
4796
4797
4798
4799
4800
4801
4802
4803
4804
4805
4806
4807
4808
4809
4810
4811
4812
4813
4814
4815
4816
4817
4818
4819
4820
4821
4822
4823
4824
4825
4826
4827
4828
4829
4830
4831
4832
4833
4834
4835
4836
4837
4838
4839
4840
4841
4842
4843
4844
4845
4846
4847
4848
4849
4850
4851
4852
4853
4854
4855
4856
4857
4858
4859
4860
4861
4862
4863
4864
4865
4866
4867
4868
4869
4870
4871
4872
4873
4874
4875
4876
4877
4878
4879
4880
4881
4882
4883
4884
4885
4886
4887
4888
4889
4890
4891
4892
4893
4894
4895
4896
4897
4898
4899
4900
4901
4902
4903
4904
4905
4906
4907
4908
4909
4910
4911
4912
4913
4914
4915
4916
4917
4918
4919
4920
4921
4922
4923
4924
4925
4926
4927
4928
4929
4930
4931
4932
4933
4934
4935
4936
4937
4938
4939
4940
4941
4942
4943
4944
4945
4946
4947
4948
4949
4950
4951
4952
4953
4954
4955
4956
4957
4958
4959
4960
4961
4962
4963
4964
4965
4966
4967
4968
4969
4970
4971
4972
4973
4974
4975
4976
4977
4978
4979
4980
/* vi:set ts=8 sts=4 sw=4 noet:
 *
 * VIM - Vi IMproved	by Bram Moolenaar
 *
 * Do ":help uganda"  in Vim to read copying and usage conditions.
 * Do ":help credits" in Vim to see a list of people who contributed.
 * See README.txt for an overview of the Vim source code.
 */

/*
 * screen.c: Lower level code for displaying on the screen.
 *
 * Output to the screen (console, terminal emulator or GUI window) is minimized
 * by remembering what is already on the screen, and only updating the parts
 * that changed.
 *
 * ScreenLines[off]  Contains a copy of the whole screen, as it is currently
 *		     displayed (excluding text written by external commands).
 * ScreenAttrs[off]  Contains the associated attributes.
 * LineOffset[row]   Contains the offset into ScreenLines*[] and ScreenAttrs[]
 *		     for each line.
 * LineWraps[row]    Flag for each line whether it wraps to the next line.
 *
 * For double-byte characters, two consecutive bytes in ScreenLines[] can form
 * one character which occupies two display cells.
 * For UTF-8 a multi-byte character is converted to Unicode and stored in
 * ScreenLinesUC[].  ScreenLines[] contains the first byte only.  For an ASCII
 * character without composing chars ScreenLinesUC[] will be 0 and
 * ScreenLinesC[][] is not used.  When the character occupies two display
 * cells the next byte in ScreenLines[] is 0.
 * ScreenLinesC[][] contain up to 'maxcombine' composing characters
 * (drawn on top of the first character).  There is 0 after the last one used.
 * ScreenLines2[] is only used for euc-jp to store the second byte if the
 * first byte is 0x8e (single-width character).
 *
 * The screen_*() functions write to the screen and handle updating
 * ScreenLines[].
 */

#include "vim.h"

/*
 * The attributes that are actually active for writing to the screen.
 */
static int	screen_attr = 0;

static void screen_char_2(unsigned off, int row, int col);
static void screenclear2(void);
static void lineclear(unsigned off, int width, int attr);
static void lineinvalid(unsigned off, int width);
static int win_do_lines(win_T *wp, int row, int line_count, int mayclear, int del, int clear_attr);
static void win_rest_invalid(win_T *wp);
static void msg_pos_mode(void);
static void recording_mode(int attr);

// Ugly global: overrule attribute used by screen_char()
static int screen_char_attr = 0;

#if defined(FEAT_CONCEAL) || defined(PROTO)
/*
 * Return TRUE if the cursor line in window "wp" may be concealed, according
 * to the 'concealcursor' option.
 */
    int
conceal_cursor_line(win_T *wp)
{
    int		c;

    if (*wp->w_p_cocu == NUL)
	return FALSE;
    if (get_real_state() & VISUAL)
	c = 'v';
    else if (State & INSERT)
	c = 'i';
    else if (State & NORMAL)
	c = 'n';
    else if (State & CMDLINE)
	c = 'c';
    else
	return FALSE;
    return vim_strchr(wp->w_p_cocu, c) != NULL;
}

/*
 * Check if the cursor line needs to be redrawn because of 'concealcursor'.
 * To be called after changing the state, "was_concealed" is the value of
 * "conceal_cursor_line()" before the change.
 * "
 */
    void
conceal_check_cursor_line(int was_concealed)
{
    if (curwin->w_p_cole > 0 && conceal_cursor_line(curwin) != was_concealed)
    {
	int wcol = curwin->w_wcol;

	need_cursor_line_redraw = TRUE;
	// Need to recompute cursor column, e.g., when starting Visual mode
	// without concealing.
	curs_columns(TRUE);

	// When concealing now w_wcol will be computed wrong, keep the previous
	// value, it will be updated in win_line().
	if (!was_concealed)
	    curwin->w_wcol = wcol;
    }
}
#endif

/*
 * Get 'wincolor' attribute for window "wp".  If not set and "wp" is a popup
 * window then get the "Pmenu" highlight attribute.
 */
    int
get_wcr_attr(win_T *wp)
{
    int wcr_attr = 0;

    if (*wp->w_p_wcr != NUL)
	wcr_attr = syn_name2attr(wp->w_p_wcr);
#ifdef FEAT_PROP_POPUP
    else if (WIN_IS_POPUP(wp))
    {
	if (wp->w_popup_flags & POPF_INFO)
	    wcr_attr = HL_ATTR(HLF_PSI);    // PmenuSel
	else
	    wcr_attr = HL_ATTR(HLF_PNI);    // Pmenu
    }
#endif
    return wcr_attr;
}

/*
 * Call screen_fill() with the columns adjusted for 'rightleft' if needed.
 * Return the new offset.
 */
    static int
screen_fill_end(
	win_T *wp,
	int	c1,
	int	c2,
	int	off,
	int	width,
	int	row,
	int	endrow,
	int	attr)
{
    int	    nn = off + width;

    if (nn > wp->w_width)
	nn = wp->w_width;
#ifdef FEAT_RIGHTLEFT
    if (wp->w_p_rl)
    {
	screen_fill(W_WINROW(wp) + row, W_WINROW(wp) + endrow,
		W_ENDCOL(wp) - nn, (int)W_ENDCOL(wp) - off,
		c1, c2, attr);
    }
    else
#endif
	screen_fill(W_WINROW(wp) + row, W_WINROW(wp) + endrow,
		wp->w_wincol + off, (int)wp->w_wincol + nn,
		c1, c2, attr);
    return nn;
}

/*
 * Clear lines near the end the window and mark the unused lines with "c1".
 * use "c2" as the filler character.
 * When "draw_margin" is TRUE then draw the sign, fold and number columns.
 */
    void
win_draw_end(
    win_T	*wp,
    int		c1,
    int		c2,
    int		draw_margin,
    int		row,
    int		endrow,
    hlf_T	hl)
{
    int		n = 0;
    int		attr = HL_ATTR(hl);
    int		wcr_attr = get_wcr_attr(wp);

    attr = hl_combine_attr(wcr_attr, attr);

    if (draw_margin)
    {
#ifdef FEAT_FOLDING
	int	fdc = compute_foldcolumn(wp, 0);

	if (fdc > 0)
	    // draw the fold column
	    n = screen_fill_end(wp, ' ', ' ', n, fdc,
		      row, endrow, hl_combine_attr(wcr_attr, HL_ATTR(HLF_FC)));
#endif
#ifdef FEAT_SIGNS
	if (signcolumn_on(wp))
	    // draw the sign column
	    n = screen_fill_end(wp, ' ', ' ', n, 2,
		      row, endrow, hl_combine_attr(wcr_attr, HL_ATTR(HLF_SC)));
#endif
	if ((wp->w_p_nu || wp->w_p_rnu)
				  && vim_strchr(p_cpo, CPO_NUMCOL) == NULL)
	    // draw the number column
	    n = screen_fill_end(wp, ' ', ' ', n, number_width(wp) + 1,
		       row, endrow, hl_combine_attr(wcr_attr, HL_ATTR(HLF_N)));
    }

#ifdef FEAT_RIGHTLEFT
    if (wp->w_p_rl)
    {
	screen_fill(W_WINROW(wp) + row, W_WINROW(wp) + endrow,
		wp->w_wincol, W_ENDCOL(wp) - 1 - n,
		c2, c2, attr);
	screen_fill(W_WINROW(wp) + row, W_WINROW(wp) + endrow,
		W_ENDCOL(wp) - 1 - n, W_ENDCOL(wp) - n,
		c1, c2, attr);
    }
    else
#endif
    {
	screen_fill(W_WINROW(wp) + row, W_WINROW(wp) + endrow,
		wp->w_wincol + n, (int)W_ENDCOL(wp),
		c1, c2, attr);
    }

    set_empty_rows(wp, row);
}

#if defined(FEAT_FOLDING) || defined(PROTO)
/*
 * Compute the width of the foldcolumn.  Based on 'foldcolumn' and how much
 * space is available for window "wp", minus "col".
 */
    int
compute_foldcolumn(win_T *wp, int col)
{
    int fdc = wp->w_p_fdc;
    int wmw = wp == curwin && p_wmw == 0 ? 1 : p_wmw;
    int wwidth = wp->w_width;

    if (fdc > wwidth - (col + wmw))
	fdc = wwidth - (col + wmw);
    return fdc;
}

/*
 * Fill the foldcolumn at "p" for window "wp".
 * Only to be called when 'foldcolumn' > 0.
 * Returns the number of bytes stored in 'p'. When non-multibyte characters are
 * used for the fold column markers, this is equal to 'fdc' setting. Otherwise,
 * this will be greater than 'fdc'.
 */
    size_t
fill_foldcolumn(
    char_u	*p,
    win_T	*wp,
    int		closed,		// TRUE of FALSE
    linenr_T	lnum)		// current line number
{
    int		i = 0;
    int		level;
    int		first_level;
    int		empty;
    int		fdc = compute_foldcolumn(wp, 0);
    size_t	byte_counter = 0;
    int		symbol = 0;
    int		len = 0;

    // Init to all spaces.
    vim_memset(p, ' ', MAX_MCO * fdc + 1);

    level = win_foldinfo.fi_level;
    empty = (fdc == 1) ? 0 : 1;

    // If the column is too narrow, we start at the lowest level that
    // fits and use numbers to indicate the depth.
    first_level = level - fdc - closed + 1 + empty;
    if (first_level < 1)
	first_level = 1;

    for (i = 0; i < MIN(fdc, level); i++)
    {
	if (win_foldinfo.fi_lnum == lnum
		&& first_level + i >= win_foldinfo.fi_low_level)
	    symbol = fill_foldopen;
	else if (first_level == 1)
	    symbol = fill_foldsep;
	else if (first_level + i <= 9)
	    symbol = '0' + first_level + i;
	else
	    symbol = '>';

	len = utf_char2bytes(symbol, &p[byte_counter]);
	byte_counter += len;
	if (first_level + i >= level)
	{
	    i++;
	    break;
	}
    }

    if (closed)
    {
	if (symbol != 0)
	{
	    // rollback length and the character
	    byte_counter -= len;
	    if (len > 1)
		// for a multibyte character, erase all the bytes
		vim_memset(p + byte_counter, ' ', len);
	}
	symbol = fill_foldclosed;
	len = utf_char2bytes(symbol, &p[byte_counter]);
	byte_counter += len;
    }

    return MAX(byte_counter + (fdc - i), (size_t)fdc);
}
#endif // FEAT_FOLDING

/*
 * Return if the composing characters at "off_from" and "off_to" differ.
 * Only to be used when ScreenLinesUC[off_from] != 0.
 */
    static int
comp_char_differs(int off_from, int off_to)
{
    int	    i;

    for (i = 0; i < Screen_mco; ++i)
    {
	if (ScreenLinesC[i][off_from] != ScreenLinesC[i][off_to])
	    return TRUE;
	if (ScreenLinesC[i][off_from] == 0)
	    break;
    }
    return FALSE;
}

/*
 * Check whether the given character needs redrawing:
 * - the (first byte of the) character is different
 * - the attributes are different
 * - the character is multi-byte and the next byte is different
 * - the character is two cells wide and the second cell differs.
 */
    static int
char_needs_redraw(int off_from, int off_to, int cols)
{
    if (cols > 0
	    && ((ScreenLines[off_from] != ScreenLines[off_to]
		    || ScreenAttrs[off_from] != ScreenAttrs[off_to])
		|| (enc_dbcs != 0
		    && MB_BYTE2LEN(ScreenLines[off_from]) > 1
		    && (enc_dbcs == DBCS_JPNU && ScreenLines[off_from] == 0x8e
			? ScreenLines2[off_from] != ScreenLines2[off_to]
			: (cols > 1 && ScreenLines[off_from + 1]
						 != ScreenLines[off_to + 1])))
		|| (enc_utf8
		    && (ScreenLinesUC[off_from] != ScreenLinesUC[off_to]
			|| (ScreenLinesUC[off_from] != 0
			    && comp_char_differs(off_from, off_to))
			|| ((*mb_off2cells)(off_from, off_from + cols) > 1
			    && ScreenLines[off_from + 1]
						!= ScreenLines[off_to + 1])))))
	return TRUE;
    return FALSE;
}

#if defined(FEAT_TERMINAL) || defined(PROTO)
/*
 * Return the index in ScreenLines[] for the current screen line.
 */
    int
screen_get_current_line_off()
{
    return (int)(current_ScreenLine - ScreenLines);
}
#endif

#ifdef FEAT_PROP_POPUP
/*
 * Return TRUE if this position has a higher level popup or this cell is
 * transparent in the current popup.
 */
    static int
blocked_by_popup(int row, int col)
{
    int off;

    if (!popup_visible)
	return FALSE;
    off = row * screen_Columns + col;
    return popup_mask[off] > screen_zindex || popup_transparent[off];
}
#endif

/*
 * Reset the highlighting.  Used before clearing the screen.
 */
    void
reset_screen_attr(void)
{
#ifdef FEAT_GUI
    if (gui.in_use)
	// Use a code that will reset gui.highlight_mask in
	// gui_stop_highlight().
	screen_attr = HL_ALL + 1;
    else
#endif
	// Use attributes that is very unlikely to appear in text.
	screen_attr = HL_BOLD | HL_UNDERLINE | HL_INVERSE | HL_STRIKETHROUGH;
}

/*
 * Move one "cooked" screen line to the screen, but only the characters that
 * have actually changed.  Handle insert/delete character.
 * "coloff" gives the first column on the screen for this line.
 * "endcol" gives the columns where valid characters are.
 * "clear_width" is the width of the window.  It's > 0 if the rest of the line
 * needs to be cleared, negative otherwise.
 * "flags" can have bits:
 * SLF_POPUP	    popup window
 * SLF_RIGHTLEFT    rightleft window:
 *    When TRUE and "clear_width" > 0, clear columns 0 to "endcol"
 *    When FALSE and "clear_width" > 0, clear columns "endcol" to "clear_width"
 */
    void
screen_line(
    int	    row,
    int	    coloff,
    int	    endcol,
    int	    clear_width,
    int	    flags UNUSED)
{
    unsigned	    off_from;
    unsigned	    off_to;
    unsigned	    max_off_from;
    unsigned	    max_off_to;
    int		    col = 0;
    int		    hl;
    int		    force = FALSE;	// force update rest of the line
    int		    redraw_this		// bool: does character need redraw?
#ifdef FEAT_GUI
				= TRUE	// For GUI when while-loop empty
#endif
				;
    int		    redraw_next;	// redraw_this for next character
    int		    clear_next = FALSE;
    int		    char_cells;		// 1: normal char
					// 2: occupies two display cells
# define CHAR_CELLS char_cells

    // Check for illegal row and col, just in case.
    if (row >= Rows)
	row = Rows - 1;
    if (endcol > Columns)
	endcol = Columns;

# ifdef FEAT_CLIPBOARD
    clip_may_clear_selection(row, row);
# endif

    off_from = (unsigned)(current_ScreenLine - ScreenLines);
    off_to = LineOffset[row] + coloff;
    max_off_from = off_from + screen_Columns;
    max_off_to = LineOffset[row] + screen_Columns;

#ifdef FEAT_RIGHTLEFT
    if (flags & SLF_RIGHTLEFT)
    {
	// Clear rest first, because it's left of the text.
	if (clear_width > 0)
	{
	    while (col <= endcol && ScreenLines[off_to] == ' '
		    && ScreenAttrs[off_to] == 0
				  && (!enc_utf8 || ScreenLinesUC[off_to] == 0))
	    {
		++off_to;
		++col;
	    }
	    if (col <= endcol)
		screen_fill(row, row + 1, col + coloff,
					    endcol + coloff + 1, ' ', ' ', 0);
	}
	col = endcol + 1;
	off_to = LineOffset[row] + col + coloff;
	off_from += col;
	endcol = (clear_width > 0 ? clear_width : -clear_width);
    }
#endif // FEAT_RIGHTLEFT

#ifdef FEAT_PROP_POPUP
    // First char of a popup window may go on top of the right half of a
    // double-wide character. Clear the left half to avoid it getting the popup
    // window background color.
    if (coloff > 0 && enc_utf8
		   && ScreenLines[off_to] == 0
		   && ScreenLinesUC[off_to - 1] != 0
		   && (*mb_char2cells)(ScreenLinesUC[off_to - 1]) > 1)
    {
	ScreenLines[off_to - 1] = ' ';
	ScreenLinesUC[off_to - 1] = 0;
	screen_char(off_to - 1, row, col + coloff - 1);
    }
#endif

    redraw_next = char_needs_redraw(off_from, off_to, endcol - col);

    while (col < endcol)
    {
	if (has_mbyte && (col + 1 < endcol))
	    char_cells = (*mb_off2cells)(off_from, max_off_from);
	else
	    char_cells = 1;

	redraw_this = redraw_next;
	redraw_next = force || char_needs_redraw(off_from + CHAR_CELLS,
			      off_to + CHAR_CELLS, endcol - col - CHAR_CELLS);

#ifdef FEAT_GUI
	// If the next character was bold, then redraw the current character to
	// remove any pixels that might have spilt over into us.  This only
	// happens in the GUI.
	if (redraw_next && gui.in_use)
	{
	    hl = ScreenAttrs[off_to + CHAR_CELLS];
	    if (hl > HL_ALL)
		hl = syn_attr2attr(hl);
	    if (hl & HL_BOLD)
		redraw_this = TRUE;
	}
#endif
#ifdef FEAT_PROP_POPUP
	if (blocked_by_popup(row, col + coloff))
	    redraw_this = FALSE;
#endif
	if (redraw_this)
	{
	    /*
	     * Special handling when 'xs' termcap flag set (hpterm):
	     * Attributes for characters are stored at the position where the
	     * cursor is when writing the highlighting code.  The
	     * start-highlighting code must be written with the cursor on the
	     * first highlighted character.  The stop-highlighting code must
	     * be written with the cursor just after the last highlighted
	     * character.
	     * Overwriting a character doesn't remove its highlighting.  Need
	     * to clear the rest of the line, and force redrawing it
	     * completely.
	     */
	    if (       p_wiv
		    && !force
#ifdef FEAT_GUI
		    && !gui.in_use
#endif
		    && ScreenAttrs[off_to] != 0
		    && ScreenAttrs[off_from] != ScreenAttrs[off_to])
	    {
		/*
		 * Need to remove highlighting attributes here.
		 */
		windgoto(row, col + coloff);
		out_str(T_CE);		// clear rest of this screen line
		screen_start();		// don't know where cursor is now
		force = TRUE;		// force redraw of rest of the line
		redraw_next = TRUE;	// or else next char would miss out

		/*
		 * If the previous character was highlighted, need to stop
		 * highlighting at this character.
		 */
		if (col + coloff > 0 && ScreenAttrs[off_to - 1] != 0)
		{
		    screen_attr = ScreenAttrs[off_to - 1];
		    term_windgoto(row, col + coloff);
		    screen_stop_highlight();
		}
		else
		    screen_attr = 0;	    // highlighting has stopped
	    }
	    if (enc_dbcs != 0)
	    {
		// Check if overwriting a double-byte with a single-byte or
		// the other way around requires another character to be
		// redrawn.  For UTF-8 this isn't needed, because comparing
		// ScreenLinesUC[] is sufficient.
		if (char_cells == 1
			&& col + 1 < endcol
			&& (*mb_off2cells)(off_to, max_off_to) > 1)
		{
		    // Writing a single-cell character over a double-cell
		    // character: need to redraw the next cell.
		    ScreenLines[off_to + 1] = 0;
		    redraw_next = TRUE;
		}
		else if (char_cells == 2
			&& col + 2 < endcol
			&& (*mb_off2cells)(off_to, max_off_to) == 1
			&& (*mb_off2cells)(off_to + 1, max_off_to) > 1)
		{
		    // Writing the second half of a double-cell character over
		    // a double-cell character: need to redraw the second
		    // cell.
		    ScreenLines[off_to + 2] = 0;
		    redraw_next = TRUE;
		}

		if (enc_dbcs == DBCS_JPNU)
		    ScreenLines2[off_to] = ScreenLines2[off_from];
	    }
	    // When writing a single-width character over a double-width
	    // character and at the end of the redrawn text, need to clear out
	    // the right halve of the old character.
	    // Also required when writing the right halve of a double-width
	    // char over the left halve of an existing one.
	    if (has_mbyte && col + char_cells == endcol
		    && ((char_cells == 1
			    && (*mb_off2cells)(off_to, max_off_to) > 1)
			|| (char_cells == 2
			    && (*mb_off2cells)(off_to, max_off_to) == 1
			    && (*mb_off2cells)(off_to + 1, max_off_to) > 1)))
		clear_next = TRUE;

	    ScreenLines[off_to] = ScreenLines[off_from];
	    if (enc_utf8)
	    {
		ScreenLinesUC[off_to] = ScreenLinesUC[off_from];
		if (ScreenLinesUC[off_from] != 0)
		{
		    int	    i;

		    for (i = 0; i < Screen_mco; ++i)
			ScreenLinesC[i][off_to] = ScreenLinesC[i][off_from];
		}
	    }
	    if (char_cells == 2)
		ScreenLines[off_to + 1] = ScreenLines[off_from + 1];

#if defined(FEAT_GUI) || defined(UNIX)
	    // The bold trick makes a single column of pixels appear in the
	    // next character.  When a bold character is removed, the next
	    // character should be redrawn too.  This happens for our own GUI
	    // and for some xterms.
	    if (
# ifdef FEAT_GUI
		    gui.in_use
# endif
# if defined(FEAT_GUI) && defined(UNIX)
		    ||
# endif
# ifdef UNIX
		    term_is_xterm
# endif
		    )
	    {
		hl = ScreenAttrs[off_to];
		if (hl > HL_ALL)
		    hl = syn_attr2attr(hl);
		if (hl & HL_BOLD)
		    redraw_next = TRUE;
	    }
#endif
	    ScreenAttrs[off_to] = ScreenAttrs[off_from];

	    // For simplicity set the attributes of second half of a
	    // double-wide character equal to the first half.
	    if (char_cells == 2)
		ScreenAttrs[off_to + 1] = ScreenAttrs[off_from];

	    if (enc_dbcs != 0 && char_cells == 2)
		screen_char_2(off_to, row, col + coloff);
	    else
		screen_char(off_to, row, col + coloff);
	}
	else if (  p_wiv
#ifdef FEAT_GUI
		&& !gui.in_use
#endif
		&& col + coloff > 0)
	{
	    if (ScreenAttrs[off_to] == ScreenAttrs[off_to - 1])
	    {
		/*
		 * Don't output stop-highlight when moving the cursor, it will
		 * stop the highlighting when it should continue.
		 */
		screen_attr = 0;
	    }
	    else if (screen_attr != 0)
		screen_stop_highlight();
	}

	off_to += CHAR_CELLS;
	off_from += CHAR_CELLS;
	col += CHAR_CELLS;
    }

    if (clear_next)
    {
	// Clear the second half of a double-wide character of which the left
	// half was overwritten with a single-wide character.
	ScreenLines[off_to] = ' ';
	if (enc_utf8)
	    ScreenLinesUC[off_to] = 0;
	screen_char(off_to, row, col + coloff);
    }

    if (clear_width > 0
#ifdef FEAT_RIGHTLEFT
		    && !(flags & SLF_RIGHTLEFT)
#endif
				   )
    {
#ifdef FEAT_GUI
	int startCol = col;
#endif

	// blank out the rest of the line
	while (col < clear_width && ScreenLines[off_to] == ' '
						  && ScreenAttrs[off_to] == 0
				  && (!enc_utf8 || ScreenLinesUC[off_to] == 0))
	{
	    ++off_to;
	    ++col;
	}
	if (col < clear_width)
	{
#ifdef FEAT_GUI
	    /*
	     * In the GUI, clearing the rest of the line may leave pixels
	     * behind if the first character cleared was bold.  Some bold
	     * fonts spill over the left.  In this case we redraw the previous
	     * character too.  If we didn't skip any blanks above, then we
	     * only redraw if the character wasn't already redrawn anyway.
	     */
	    if (gui.in_use && (col > startCol || !redraw_this))
	    {
		hl = ScreenAttrs[off_to];
		if (hl > HL_ALL || (hl & HL_BOLD))
		{
		    int prev_cells = 1;

		    if (enc_utf8)
			// for utf-8, ScreenLines[char_offset + 1] == 0 means
			// that its width is 2.
			prev_cells = ScreenLines[off_to - 1] == 0 ? 2 : 1;
		    else if (enc_dbcs != 0)
		    {
			// find previous character by counting from first
			// column and get its width.
			unsigned off = LineOffset[row];
			unsigned max_off = LineOffset[row] + screen_Columns;

			while (off < off_to)
			{
			    prev_cells = (*mb_off2cells)(off, max_off);
			    off += prev_cells;
			}
		    }

		    if (enc_dbcs != 0 && prev_cells > 1)
			screen_char_2(off_to - prev_cells, row,
						   col + coloff - prev_cells);
		    else
			screen_char(off_to - prev_cells, row,
						   col + coloff - prev_cells);
		}
	    }
#endif
	    screen_fill(row, row + 1, col + coloff, clear_width + coloff,
								 ' ', ' ', 0);
	    off_to += clear_width - col;
	    col = clear_width;
	}
    }

    if (clear_width > 0
#ifdef FEAT_PROP_POPUP
	    && !(flags & SLF_POPUP)  // no separator for popup window
#endif
	    )
    {
	// For a window that has a right neighbor, draw the separator char
	// right of the window contents.  But not on top of a popup window.
	if (coloff + col < Columns)
	{
#ifdef FEAT_PROP_POPUP
	    if (!blocked_by_popup(row, col + coloff))
#endif
	    {
		int c;

		c = fillchar_vsep(&hl);
		if (ScreenLines[off_to] != (schar_T)c
			|| (enc_utf8 && (int)ScreenLinesUC[off_to]
							!= (c >= 0x80 ? c : 0))
			|| ScreenAttrs[off_to] != hl)
		{
		    ScreenLines[off_to] = c;
		    ScreenAttrs[off_to] = hl;
		    if (enc_utf8)
		    {
			if (c >= 0x80)
			{
			    ScreenLinesUC[off_to] = c;
			    ScreenLinesC[0][off_to] = 0;
			}
			else
			    ScreenLinesUC[off_to] = 0;
		    }
		    screen_char(off_to, row, col + coloff);
		}
	    }
	}
	else
	    LineWraps[row] = FALSE;
    }
}

#if defined(FEAT_RIGHTLEFT) || defined(PROTO)
/*
 * Mirror text "str" for right-left displaying.
 * Only works for single-byte characters (e.g., numbers).
 */
    void
rl_mirror(char_u *str)
{
    char_u	*p1, *p2;
    int		t;

    for (p1 = str, p2 = str + STRLEN(str) - 1; p1 < p2; ++p1, --p2)
    {
	t = *p1;
	*p1 = *p2;
	*p2 = t;
    }
}
#endif

/*
 * Draw the verticap separator right of window "wp" starting with line "row".
 */
    void
draw_vsep_win(win_T *wp, int row)
{
    int		hl;
    int		c;

    if (wp->w_vsep_width)
    {
	// draw the vertical separator right of this window
	c = fillchar_vsep(&hl);
	screen_fill(W_WINROW(wp) + row, W_WINROW(wp) + wp->w_height,
		W_ENDCOL(wp), W_ENDCOL(wp) + 1,
		c, ' ', hl);
    }
}

#ifdef FEAT_WILDMENU
static int skip_status_match_char(expand_T *xp, char_u *s);

/*
 * Get the length of an item as it will be shown in the status line.
 */
    static int
status_match_len(expand_T *xp, char_u *s)
{
    int	len = 0;

#ifdef FEAT_MENU
    int emenu = (xp->xp_context == EXPAND_MENUS
	    || xp->xp_context == EXPAND_MENUNAMES);

    // Check for menu separators - replace with '|'.
    if (emenu && menu_is_separator(s))
	return 1;
#endif

    while (*s != NUL)
    {
	s += skip_status_match_char(xp, s);
	len += ptr2cells(s);
	MB_PTR_ADV(s);
    }

    return len;
}

/*
 * Return the number of characters that should be skipped in a status match.
 * These are backslashes used for escaping.  Do show backslashes in help tags.
 */
    static int
skip_status_match_char(expand_T *xp, char_u *s)
{
    if ((rem_backslash(s) && xp->xp_context != EXPAND_HELP)
#ifdef FEAT_MENU
	    || ((xp->xp_context == EXPAND_MENUS
		    || xp->xp_context == EXPAND_MENUNAMES)
			  && (s[0] == '\t' || (s[0] == '\\' && s[1] != NUL)))
#endif
	   )
    {
#ifndef BACKSLASH_IN_FILENAME
	if (xp->xp_shell && csh_like_shell() && s[1] == '\\' && s[2] == '!')
	    return 2;
#endif
	return 1;
    }
    return 0;
}

/*
 * Show wildchar matches in the status line.
 * Show at least the "match" item.
 * We start at item 'first_match' in the list and show all matches that fit.
 *
 * If inversion is possible we use it. Else '=' characters are used.
 */
    void
win_redr_status_matches(
    expand_T	*xp,
    int		num_matches,
    char_u	**matches,	// list of matches
    int		match,
    int		showtail)
{
#define L_MATCH(m) (showtail ? sm_gettail(matches[m]) : matches[m])
    int		row;
    char_u	*buf;
    int		len;
    int		clen;		// length in screen cells
    int		fillchar;
    int		attr;
    int		i;
    int		highlight = TRUE;
    char_u	*selstart = NULL;
    int		selstart_col = 0;
    char_u	*selend = NULL;
    static int	first_match = 0;
    int		add_left = FALSE;
    char_u	*s;
#ifdef FEAT_MENU
    int		emenu;
#endif
    int		l;

    if (matches == NULL)	// interrupted completion?
	return;

    if (has_mbyte)
	buf = alloc(Columns * MB_MAXBYTES + 1);
    else
	buf = alloc(Columns + 1);
    if (buf == NULL)
	return;

    if (match == -1)	// don't show match but original text
    {
	match = 0;
	highlight = FALSE;
    }
    // count 1 for the ending ">"
    clen = status_match_len(xp, L_MATCH(match)) + 3;
    if (match == 0)
	first_match = 0;
    else if (match < first_match)
    {
	// jumping left, as far as we can go
	first_match = match;
	add_left = TRUE;
    }
    else
    {
	// check if match fits on the screen
	for (i = first_match; i < match; ++i)
	    clen += status_match_len(xp, L_MATCH(i)) + 2;
	if (first_match > 0)
	    clen += 2;
	// jumping right, put match at the left
	if ((long)clen > Columns)
	{
	    first_match = match;
	    // if showing the last match, we can add some on the left
	    clen = 2;
	    for (i = match; i < num_matches; ++i)
	    {
		clen += status_match_len(xp, L_MATCH(i)) + 2;
		if ((long)clen >= Columns)
		    break;
	    }
	    if (i == num_matches)
		add_left = TRUE;
	}
    }
    if (add_left)
	while (first_match > 0)
	{
	    clen += status_match_len(xp, L_MATCH(first_match - 1)) + 2;
	    if ((long)clen >= Columns)
		break;
	    --first_match;
	}

    fillchar = fillchar_status(&attr, curwin);

    if (first_match == 0)
    {
	*buf = NUL;
	len = 0;
    }
    else
    {
	STRCPY(buf, "< ");
	len = 2;
    }
    clen = len;

    i = first_match;
    while ((long)(clen + status_match_len(xp, L_MATCH(i)) + 2) < Columns)
    {
	if (i == match)
	{
	    selstart = buf + len;
	    selstart_col = clen;
	}

	s = L_MATCH(i);
	// Check for menu separators - replace with '|'
#ifdef FEAT_MENU
	emenu = (xp->xp_context == EXPAND_MENUS
		|| xp->xp_context == EXPAND_MENUNAMES);
	if (emenu && menu_is_separator(s))
	{
	    STRCPY(buf + len, transchar('|'));
	    l = (int)STRLEN(buf + len);
	    len += l;
	    clen += l;
	}
	else
#endif
	    for ( ; *s != NUL; ++s)
	{
	    s += skip_status_match_char(xp, s);
	    clen += ptr2cells(s);
	    if (has_mbyte && (l = (*mb_ptr2len)(s)) > 1)
	    {
		STRNCPY(buf + len, s, l);
		s += l - 1;
		len += l;
	    }
	    else
	    {
		STRCPY(buf + len, transchar_byte(*s));
		len += (int)STRLEN(buf + len);
	    }
	}
	if (i == match)
	    selend = buf + len;

	*(buf + len++) = ' ';
	*(buf + len++) = ' ';
	clen += 2;
	if (++i == num_matches)
		break;
    }

    if (i != num_matches)
    {
	*(buf + len++) = '>';
	++clen;
    }

    buf[len] = NUL;

    row = cmdline_row - 1;
    if (row >= 0)
    {
	if (wild_menu_showing == 0)
	{
	    if (msg_scrolled > 0)
	    {
		// Put the wildmenu just above the command line.  If there is
		// no room, scroll the screen one line up.
		if (cmdline_row == Rows - 1)
		{
		    screen_del_lines(0, 0, 1, (int)Rows, TRUE, 0, NULL);
		    ++msg_scrolled;
		}
		else
		{
		    ++cmdline_row;
		    ++row;
		}
		wild_menu_showing = WM_SCROLLED;
	    }
	    else
	    {
		// Create status line if needed by setting 'laststatus' to 2.
		// Set 'winminheight' to zero to avoid that the window is
		// resized.
		if (lastwin->w_status_height == 0)
		{
		    save_p_ls = p_ls;
		    save_p_wmh = p_wmh;
		    p_ls = 2;
		    p_wmh = 0;
		    last_status(FALSE);
		}
		wild_menu_showing = WM_SHOWN;
	    }
	}

	screen_puts(buf, row, 0, attr);
	if (selstart != NULL && highlight)
	{
	    *selend = NUL;
	    screen_puts(selstart, row, selstart_col, HL_ATTR(HLF_WM));
	}

	screen_fill(row, row + 1, clen, (int)Columns, fillchar, fillchar, attr);
    }

    win_redraw_last_status(topframe);
    vim_free(buf);
}
#endif

/*
 * Return TRUE if the status line of window "wp" is connected to the status
 * line of the window right of it.  If not, then it's a vertical separator.
 * Only call if (wp->w_vsep_width != 0).
 */
    int
stl_connected(win_T *wp)
{
    frame_T	*fr;

    fr = wp->w_frame;
    while (fr->fr_parent != NULL)
    {
	if (fr->fr_parent->fr_layout == FR_COL)
	{
	    if (fr->fr_next != NULL)
		break;
	}
	else
	{
	    if (fr->fr_next != NULL)
		return TRUE;
	}
	fr = fr->fr_parent;
    }
    return FALSE;
}


/*
 * Get the value to show for the language mappings, active 'keymap'.
 */
    int
get_keymap_str(
    win_T	*wp,
    char_u	*fmt,	    // format string containing one %s item
    char_u	*buf,	    // buffer for the result
    int		len)	    // length of buffer
{
    char_u	*p;

    if (wp->w_buffer->b_p_iminsert != B_IMODE_LMAP)
	return FALSE;

    {
#ifdef FEAT_EVAL
	buf_T	*old_curbuf = curbuf;
	win_T	*old_curwin = curwin;
	char_u	*s;

	curbuf = wp->w_buffer;
	curwin = wp;
	STRCPY(buf, "b:keymap_name");	// must be writable
	++emsg_skip;
	s = p = eval_to_string(buf, FALSE);
	--emsg_skip;
	curbuf = old_curbuf;
	curwin = old_curwin;
	if (p == NULL || *p == NUL)
#endif
	{
#ifdef FEAT_KEYMAP
	    if (wp->w_buffer->b_kmap_state & KEYMAP_LOADED)
		p = wp->w_buffer->b_p_keymap;
	    else
#endif
		p = (char_u *)"lang";
	}
	if (vim_snprintf((char *)buf, len, (char *)fmt, p) > len - 1)
	    buf[0] = NUL;
#ifdef FEAT_EVAL
	vim_free(s);
#endif
    }
    return buf[0] != NUL;
}

#if defined(FEAT_STL_OPT) || defined(PROTO)
/*
 * Redraw the status line or ruler of window "wp".
 * When "wp" is NULL redraw the tab pages line from 'tabline'.
 */
    void
win_redr_custom(
    win_T	*wp,
    int		draw_ruler)	// TRUE or FALSE
{
    static int	entered = FALSE;
    int		attr;
    int		curattr;
    int		row;
    int		col = 0;
    int		maxwidth;
    int		width;
    int		n;
    int		len;
    int		fillchar;
    char_u	buf[MAXPATHL];
    char_u	*stl;
    char_u	*p;
    stl_hlrec_T *hltab;
    stl_hlrec_T *tabtab;
    int		use_sandbox = FALSE;
    win_T	*ewp;
    int		p_crb_save;

    // There is a tiny chance that this gets called recursively: When
    // redrawing a status line triggers redrawing the ruler or tabline.
    // Avoid trouble by not allowing recursion.
    if (entered)
	return;
    entered = TRUE;

    // setup environment for the task at hand
    if (wp == NULL)
    {
	// Use 'tabline'.  Always at the first line of the screen.
	stl = p_tal;
	row = 0;
	fillchar = ' ';
	attr = HL_ATTR(HLF_TPF);
	maxwidth = Columns;
# ifdef FEAT_EVAL
	use_sandbox = was_set_insecurely((char_u *)"tabline", 0);
# endif
    }
    else
    {
	row = statusline_row(wp);
	fillchar = fillchar_status(&attr, wp);
	maxwidth = wp->w_width;

	if (draw_ruler)
	{
	    stl = p_ruf;
	    // advance past any leading group spec - implicit in ru_col
	    if (*stl == '%')
	    {
		if (*++stl == '-')
		    stl++;
		if (atoi((char *)stl))
		    while (VIM_ISDIGIT(*stl))
			stl++;
		if (*stl++ != '(')
		    stl = p_ruf;
	    }
	    col = ru_col - (Columns - wp->w_width);
	    if (col < (wp->w_width + 1) / 2)
		col = (wp->w_width + 1) / 2;
	    maxwidth = wp->w_width - col;
	    if (!wp->w_status_height)
	    {
		row = Rows - 1;
		--maxwidth;	// writing in last column may cause scrolling
		fillchar = ' ';
		attr = 0;
	    }

# ifdef FEAT_EVAL
	    use_sandbox = was_set_insecurely((char_u *)"rulerformat", 0);
# endif
	}
	else
	{
	    if (*wp->w_p_stl != NUL)
		stl = wp->w_p_stl;
	    else
		stl = p_stl;
# ifdef FEAT_EVAL
	    use_sandbox = was_set_insecurely((char_u *)"statusline",
					 *wp->w_p_stl == NUL ? 0 : OPT_LOCAL);
# endif
	}

	col += wp->w_wincol;
    }

    if (maxwidth <= 0)
	goto theend;

    // Temporarily reset 'cursorbind', we don't want a side effect from moving
    // the cursor away and back.
    ewp = wp == NULL ? curwin : wp;
    p_crb_save = ewp->w_p_crb;
    ewp->w_p_crb = FALSE;

    // Make a copy, because the statusline may include a function call that
    // might change the option value and free the memory.
    stl = vim_strsave(stl);
    width = build_stl_str_hl(ewp, buf, sizeof(buf),
				stl, use_sandbox,
				fillchar, maxwidth, &hltab, &tabtab);
    vim_free(stl);
    ewp->w_p_crb = p_crb_save;

    // Make all characters printable.
    p = transstr(buf);
    if (p != NULL)
    {
	vim_strncpy(buf, p, sizeof(buf) - 1);
	vim_free(p);
    }

    // fill up with "fillchar"
    len = (int)STRLEN(buf);
    while (width < maxwidth && len < (int)sizeof(buf) - 1)
    {
	len += (*mb_char2bytes)(fillchar, buf + len);
	++width;
    }
    buf[len] = NUL;

    /*
     * Draw each snippet with the specified highlighting.
     */
    curattr = attr;
    p = buf;
    for (n = 0; hltab[n].start != NULL; n++)
    {
	len = (int)(hltab[n].start - p);
	screen_puts_len(p, len, row, col, curattr);
	col += vim_strnsize(p, len);
	p = hltab[n].start;

	if (hltab[n].userhl == 0)
	    curattr = attr;
	else if (hltab[n].userhl < 0)
	    curattr = syn_id2attr(-hltab[n].userhl);
#ifdef FEAT_TERMINAL
	else if (wp != NULL && wp != curwin && bt_terminal(wp->w_buffer)
						   && wp->w_status_height != 0)
	    curattr = highlight_stltermnc[hltab[n].userhl - 1];
	else if (wp != NULL && bt_terminal(wp->w_buffer)
						   && wp->w_status_height != 0)
	    curattr = highlight_stlterm[hltab[n].userhl - 1];
#endif
	else if (wp != NULL && wp != curwin && wp->w_status_height != 0)
	    curattr = highlight_stlnc[hltab[n].userhl - 1];
	else
	    curattr = highlight_user[hltab[n].userhl - 1];
    }
    screen_puts(p, row, col, curattr);

    if (wp == NULL)
    {
	// Fill the TabPageIdxs[] array for clicking in the tab pagesline.
	col = 0;
	len = 0;
	p = buf;
	fillchar = 0;
	for (n = 0; tabtab[n].start != NULL; n++)
	{
	    len += vim_strnsize(p, (int)(tabtab[n].start - p));
	    while (col < len)
		TabPageIdxs[col++] = fillchar;
	    p = tabtab[n].start;
	    fillchar = tabtab[n].userhl;
	}
	while (col < Columns)
	    TabPageIdxs[col++] = fillchar;
    }

theend:
    entered = FALSE;
}

#endif // FEAT_STL_OPT

/*
 * Output a single character directly to the screen and update ScreenLines.
 */
    void
screen_putchar(int c, int row, int col, int attr)
{
    char_u	buf[MB_MAXBYTES + 1];

    if (has_mbyte)
	buf[(*mb_char2bytes)(c, buf)] = NUL;
    else
    {
	buf[0] = c;
	buf[1] = NUL;
    }
    screen_puts(buf, row, col, attr);
}

/*
 * Get a single character directly from ScreenLines into "bytes[]".
 * Also return its attribute in *attrp;
 */
    void
screen_getbytes(int row, int col, char_u *bytes, int *attrp)
{
    unsigned off;

    // safety check
    if (ScreenLines != NULL && row < screen_Rows && col < screen_Columns)
    {
	off = LineOffset[row] + col;
	*attrp = ScreenAttrs[off];
	bytes[0] = ScreenLines[off];
	bytes[1] = NUL;

	if (enc_utf8 && ScreenLinesUC[off] != 0)
	    bytes[utfc_char2bytes(off, bytes)] = NUL;
	else if (enc_dbcs == DBCS_JPNU && ScreenLines[off] == 0x8e)
	{
	    bytes[0] = ScreenLines[off];
	    bytes[1] = ScreenLines2[off];
	    bytes[2] = NUL;
	}
	else if (enc_dbcs && MB_BYTE2LEN(bytes[0]) > 1)
	{
	    bytes[1] = ScreenLines[off + 1];
	    bytes[2] = NUL;
	}
    }
}

/*
 * Return TRUE if composing characters for screen posn "off" differs from
 * composing characters in "u8cc".
 * Only to be used when ScreenLinesUC[off] != 0.
 */
    static int
screen_comp_differs(int off, int *u8cc)
{
    int	    i;

    for (i = 0; i < Screen_mco; ++i)
    {
	if (ScreenLinesC[i][off] != (u8char_T)u8cc[i])
	    return TRUE;
	if (u8cc[i] == 0)
	    break;
    }
    return FALSE;
}

/*
 * Put string '*text' on the screen at position 'row' and 'col', with
 * attributes 'attr', and update ScreenLines[] and ScreenAttrs[].
 * Note: only outputs within one row, message is truncated at screen boundary!
 * Note: if ScreenLines[], row and/or col is invalid, nothing is done.
 */
    void
screen_puts(
    char_u	*text,
    int		row,
    int		col,
    int		attr)
{
    screen_puts_len(text, -1, row, col, attr);
}

/*
 * Like screen_puts(), but output "text[len]".  When "len" is -1 output up to
 * a NUL.
 */
    void
screen_puts_len(
    char_u	*text,
    int		textlen,
    int		row,
    int		col,
    int		attr)
{
    unsigned	off;
    char_u	*ptr = text;
    int		len = textlen;
    int		c;
    unsigned	max_off;
    int		mbyte_blen = 1;
    int		mbyte_cells = 1;
    int		u8c = 0;
    int		u8cc[MAX_MCO];
    int		clear_next_cell = FALSE;
#ifdef FEAT_ARABIC
    int		prev_c = 0;		// previous Arabic character
    int		pc, nc, nc1;
    int		pcc[MAX_MCO];
#endif
    int		force_redraw_this;
    int		force_redraw_next = FALSE;
    int		need_redraw;

    // Safety check. The check for negative row and column is to fix issue
    // #4102. TODO: find out why row/col could be negative.
    if (ScreenLines == NULL
	    || row >= screen_Rows || row < 0
	    || col >= screen_Columns || col < 0)
	return;
    off = LineOffset[row] + col;

    // When drawing over the right halve of a double-wide char clear out the
    // left halve.  Only needed in a terminal.
    if (has_mbyte && col > 0 && col < screen_Columns
#ifdef FEAT_GUI
	    && !gui.in_use
#endif
	    && mb_fix_col(col, row) != col)
    {
	ScreenLines[off - 1] = ' ';
	ScreenAttrs[off - 1] = 0;
	if (enc_utf8)
	{
	    ScreenLinesUC[off - 1] = 0;
	    ScreenLinesC[0][off - 1] = 0;
	}
	// redraw the previous cell, make it empty
	screen_char(off - 1, row, col - 1);
	// force the cell at "col" to be redrawn
	force_redraw_next = TRUE;
    }

    max_off = LineOffset[row] + screen_Columns;
    while (col < screen_Columns
	    && (len < 0 || (int)(ptr - text) < len)
	    && *ptr != NUL)
    {
	c = *ptr;
	// check if this is the first byte of a multibyte
	if (has_mbyte)
	{
	    if (enc_utf8 && len > 0)
		mbyte_blen = utfc_ptr2len_len(ptr, (int)((text + len) - ptr));
	    else
		mbyte_blen = (*mb_ptr2len)(ptr);
	    if (enc_dbcs == DBCS_JPNU && c == 0x8e)
		mbyte_cells = 1;
	    else if (enc_dbcs != 0)
		mbyte_cells = mbyte_blen;
	    else	// enc_utf8
	    {
		if (len >= 0)
		    u8c = utfc_ptr2char_len(ptr, u8cc,
						   (int)((text + len) - ptr));
		else
		    u8c = utfc_ptr2char(ptr, u8cc);
		mbyte_cells = utf_char2cells(u8c);
#ifdef FEAT_ARABIC
		if (p_arshape && !p_tbidi && ARABIC_CHAR(u8c))
		{
		    // Do Arabic shaping.
		    if (len >= 0 && (int)(ptr - text) + mbyte_blen >= len)
		    {
			// Past end of string to be displayed.
			nc = NUL;
			nc1 = NUL;
		    }
		    else
		    {
			nc = utfc_ptr2char_len(ptr + mbyte_blen, pcc,
				      (int)((text + len) - ptr - mbyte_blen));
			nc1 = pcc[0];
		    }
		    pc = prev_c;
		    prev_c = u8c;
		    u8c = arabic_shape(u8c, &c, &u8cc[0], nc, nc1, pc);
		}
		else
		    prev_c = u8c;
#endif
		if (col + mbyte_cells > screen_Columns)
		{
		    // Only 1 cell left, but character requires 2 cells:
		    // display a '>' in the last column to avoid wrapping.
		    c = '>';
		    mbyte_cells = 1;
		}
	    }
	}

	force_redraw_this = force_redraw_next;
	force_redraw_next = FALSE;

	need_redraw = ScreenLines[off] != c
		|| (mbyte_cells == 2
		    && ScreenLines[off + 1] != (enc_dbcs ? ptr[1] : 0))
		|| (enc_dbcs == DBCS_JPNU
		    && c == 0x8e
		    && ScreenLines2[off] != ptr[1])
		|| (enc_utf8
		    && (ScreenLinesUC[off] !=
				(u8char_T)(c < 0x80 && u8cc[0] == 0 ? 0 : u8c)
			|| (ScreenLinesUC[off] != 0
					  && screen_comp_differs(off, u8cc))))
		|| ScreenAttrs[off] != attr
		|| exmode_active;

	if ((need_redraw || force_redraw_this)
#ifdef FEAT_PROP_POPUP
		&& !blocked_by_popup(row, col)
#endif
	   )
	{
#if defined(FEAT_GUI) || defined(UNIX)
	    // The bold trick makes a single row of pixels appear in the next
	    // character.  When a bold character is removed, the next
	    // character should be redrawn too.  This happens for our own GUI
	    // and for some xterms.
	    if (need_redraw && ScreenLines[off] != ' ' && (
# ifdef FEAT_GUI
		    gui.in_use
# endif
# if defined(FEAT_GUI) && defined(UNIX)
		    ||
# endif
# ifdef UNIX
		    term_is_xterm
# endif
		    ))
	    {
		int	n = ScreenAttrs[off];

		if (n > HL_ALL)
		    n = syn_attr2attr(n);
		if (n & HL_BOLD)
		    force_redraw_next = TRUE;
	    }
#endif
	    // When at the end of the text and overwriting a two-cell
	    // character with a one-cell character, need to clear the next
	    // cell.  Also when overwriting the left halve of a two-cell char
	    // with the right halve of a two-cell char.  Do this only once
	    // (mb_off2cells() may return 2 on the right halve).
	    if (clear_next_cell)
		clear_next_cell = FALSE;
	    else if (has_mbyte
		    && (len < 0 ? ptr[mbyte_blen] == NUL
					     : ptr + mbyte_blen >= text + len)
		    && ((mbyte_cells == 1 && (*mb_off2cells)(off, max_off) > 1)
			|| (mbyte_cells == 2
			    && (*mb_off2cells)(off, max_off) == 1
			    && (*mb_off2cells)(off + 1, max_off) > 1)))
		clear_next_cell = TRUE;

	    // Make sure we never leave a second byte of a double-byte behind,
	    // it confuses mb_off2cells().
	    if (enc_dbcs
		    && ((mbyte_cells == 1 && (*mb_off2cells)(off, max_off) > 1)
			|| (mbyte_cells == 2
			    && (*mb_off2cells)(off, max_off) == 1
			    && (*mb_off2cells)(off + 1, max_off) > 1)))
		ScreenLines[off + mbyte_blen] = 0;
	    ScreenLines[off] = c;
	    ScreenAttrs[off] = attr;
	    if (enc_utf8)
	    {
		if (c < 0x80 && u8cc[0] == 0)
		    ScreenLinesUC[off] = 0;
		else
		{
		    int	    i;

		    ScreenLinesUC[off] = u8c;
		    for (i = 0; i < Screen_mco; ++i)
		    {
			ScreenLinesC[i][off] = u8cc[i];
			if (u8cc[i] == 0)
			    break;
		    }
		}
		if (mbyte_cells == 2)
		{
		    ScreenLines[off + 1] = 0;
		    ScreenAttrs[off + 1] = attr;
		}
		screen_char(off, row, col);
	    }
	    else if (mbyte_cells == 2)
	    {
		ScreenLines[off + 1] = ptr[1];
		ScreenAttrs[off + 1] = attr;
		screen_char_2(off, row, col);
	    }
	    else if (enc_dbcs == DBCS_JPNU && c == 0x8e)
	    {
		ScreenLines2[off] = ptr[1];
		screen_char(off, row, col);
	    }
	    else
		screen_char(off, row, col);
	}
	if (has_mbyte)
	{
	    off += mbyte_cells;
	    col += mbyte_cells;
	    ptr += mbyte_blen;
	    if (clear_next_cell)
	    {
		// This only happens at the end, display one space next.
		ptr = (char_u *)" ";
		len = -1;
	    }
	}
	else
	{
	    ++off;
	    ++col;
	    ++ptr;
	}
    }

    // If we detected the next character needs to be redrawn, but the text
    // doesn't extend up to there, update the character here.
    if (force_redraw_next && col < screen_Columns)
    {
	if (enc_dbcs != 0 && dbcs_off2cells(off, max_off) > 1)
	    screen_char_2(off, row, col);
	else
	    screen_char(off, row, col);
    }
}

#if defined(FEAT_SEARCH_EXTRA) || defined(PROTO)
/*
 * Prepare for 'hlsearch' highlighting.
 */
    void
start_search_hl(void)
{
    if (p_hls && !no_hlsearch)
    {
	end_search_hl();  // just in case it wasn't called before
	last_pat_prog(&screen_search_hl.rm);
	screen_search_hl.attr = HL_ATTR(HLF_L);
# ifdef FEAT_RELTIME
	// Set the time limit to 'redrawtime'.
	profile_setlimit(p_rdt, &screen_search_hl.tm);
# endif
    }
}

/*
 * Clean up for 'hlsearch' highlighting.
 */
    void
end_search_hl(void)
{
    if (screen_search_hl.rm.regprog != NULL)
    {
	vim_regfree(screen_search_hl.rm.regprog);
	screen_search_hl.rm.regprog = NULL;
    }
}
#endif

      static void
screen_start_highlight(int attr)
{
    attrentry_T *aep = NULL;

    screen_attr = attr;
    if (full_screen
#ifdef MSWIN
		    && termcap_active
#endif
				       )
    {
#ifdef FEAT_GUI
	if (gui.in_use)
	{
	    char	buf[20];

	    // The GUI handles this internally.
	    sprintf(buf, IF_EB("\033|%dh", ESC_STR "|%dh"), attr);
	    OUT_STR(buf);
	}
	else
#endif
	{
	    if (attr > HL_ALL)				// special HL attr.
	    {
		if (IS_CTERM)
		    aep = syn_cterm_attr2entry(attr);
		else
		    aep = syn_term_attr2entry(attr);
		if (aep == NULL)	    // did ":syntax clear"
		    attr = 0;
		else
		    attr = aep->ae_attr;
	    }
#if defined(FEAT_VTP) && defined(FEAT_TERMGUICOLORS)
	    if (use_vtp())
	    {
		guicolor_T  defguifg, defguibg;
		int	    defctermfg, defctermbg;

		// If FG and BG are unset, the color is undefined when
		// BOLD+INVERSE. Use Normal as the default value.
		get_default_console_color(&defctermfg, &defctermbg, &defguifg,
								    &defguibg);

		if (p_tgc)
		{
		    if (aep == NULL || COLOR_INVALID(aep->ae_u.cterm.fg_rgb))
			term_fg_rgb_color(defguifg);
		    if (aep == NULL || COLOR_INVALID(aep->ae_u.cterm.bg_rgb))
			term_bg_rgb_color(defguibg);
		}
		else if (t_colors >= 256)
		{
		    if (aep == NULL || aep->ae_u.cterm.fg_color == 0)
			term_fg_color(defctermfg);
		    if (aep == NULL || aep->ae_u.cterm.bg_color == 0)
			term_bg_color(defctermbg);
		}
	    }
#endif
	    if ((attr & HL_BOLD) && *T_MD != NUL)	// bold
		out_str(T_MD);
	    else if (aep != NULL && cterm_normal_fg_bold && (
#ifdef FEAT_TERMGUICOLORS
			p_tgc && aep->ae_u.cterm.fg_rgb != CTERMCOLOR
			  ? aep->ae_u.cterm.fg_rgb != INVALCOLOR
			  :
#endif
			    t_colors > 1 && aep->ae_u.cterm.fg_color))
		// If the Normal FG color has BOLD attribute and the new HL
		// has a FG color defined, clear BOLD.
		out_str(T_ME);
	    if ((attr & HL_STANDOUT) && *T_SO != NUL)	// standout
		out_str(T_SO);
	    if ((attr & HL_UNDERCURL) && *T_UCS != NUL) // undercurl
		out_str(T_UCS);
	    if (((attr & HL_UNDERLINE)	    // underline or undercurl
			|| ((attr & HL_UNDERCURL) && *T_UCS == NUL))
		    && *T_US != NUL)
		out_str(T_US);
	    if ((attr & HL_ITALIC) && *T_CZH != NUL)	// italic
		out_str(T_CZH);
	    if ((attr & HL_INVERSE) && *T_MR != NUL)	// inverse (reverse)
		out_str(T_MR);
	    if ((attr & HL_STRIKETHROUGH) && *T_STS != NUL)	// strike
		out_str(T_STS);

	    /*
	     * Output the color or start string after bold etc., in case the
	     * bold etc. override the color setting.
	     */
	    if (aep != NULL)
	    {
#ifdef FEAT_TERMGUICOLORS
		// When 'termguicolors' is set but fg or bg is unset,
		// fall back to the cterm colors.   This helps for SpellBad,
		// where the GUI uses a red undercurl.
		if (p_tgc && aep->ae_u.cterm.fg_rgb != CTERMCOLOR)
		{
		    if (aep->ae_u.cterm.fg_rgb != INVALCOLOR)
			term_fg_rgb_color(aep->ae_u.cterm.fg_rgb);
		}
		else
#endif
		if (t_colors > 1)
		{
		    if (aep->ae_u.cterm.fg_color)
			term_fg_color(aep->ae_u.cterm.fg_color - 1);
		}
#ifdef FEAT_TERMGUICOLORS
		if (p_tgc && aep->ae_u.cterm.bg_rgb != CTERMCOLOR)
		{
		    if (aep->ae_u.cterm.bg_rgb != INVALCOLOR)
			term_bg_rgb_color(aep->ae_u.cterm.bg_rgb);
		}
		else
#endif
		if (t_colors > 1)
		{
		    if (aep->ae_u.cterm.bg_color)
			term_bg_color(aep->ae_u.cterm.bg_color - 1);
		}
#ifdef FEAT_TERMGUICOLORS
		if (p_tgc && aep->ae_u.cterm.ul_rgb != CTERMCOLOR)
		{
		    if (aep->ae_u.cterm.ul_rgb != INVALCOLOR)
			term_ul_rgb_color(aep->ae_u.cterm.ul_rgb);
		}
		else
#endif
		if (t_colors > 1)
		{
		    if (aep->ae_u.cterm.ul_color)
			term_ul_color(aep->ae_u.cterm.ul_color - 1);
		}

		if (!IS_CTERM)
		{
		    if (aep->ae_u.term.start != NULL)
			out_str(aep->ae_u.term.start);
		}
	    }
	}
    }
}

      void
screen_stop_highlight(void)
{
    int	    do_ME = FALSE;	    // output T_ME code
#if defined(FEAT_VTP) && defined(FEAT_TERMGUICOLORS)
    int	    do_ME_fg = FALSE, do_ME_bg = FALSE;
#endif

    if (screen_attr != 0
#ifdef MSWIN
			&& termcap_active
#endif
					   )
    {
#ifdef FEAT_GUI
	if (gui.in_use)
	{
	    char	buf[20];

	    // use internal GUI code
	    sprintf(buf, IF_EB("\033|%dH", ESC_STR "|%dH"), screen_attr);
	    OUT_STR(buf);
	}
	else
#endif
	{
	    if (screen_attr > HL_ALL)			// special HL attr.
	    {
		attrentry_T *aep;

		if (IS_CTERM)
		{
		    /*
		     * Assume that t_me restores the original colors!
		     */
		    aep = syn_cterm_attr2entry(screen_attr);
		    if (aep != NULL && ((
#ifdef FEAT_TERMGUICOLORS
			    p_tgc && aep->ae_u.cterm.fg_rgb != CTERMCOLOR
				? aep->ae_u.cterm.fg_rgb != INVALCOLOR
# ifdef FEAT_VTP
				    ? !(do_ME_fg = TRUE) : (do_ME_fg = FALSE)
# endif
				:
#endif
				aep->ae_u.cterm.fg_color) || (
#ifdef FEAT_TERMGUICOLORS
			    p_tgc && aep->ae_u.cterm.bg_rgb != CTERMCOLOR
				? aep->ae_u.cterm.bg_rgb != INVALCOLOR
# ifdef FEAT_VTP
				    ? !(do_ME_bg = TRUE) : (do_ME_bg = FALSE)
# endif
				:
#endif
				aep->ae_u.cterm.bg_color)))
			do_ME = TRUE;
#if defined(FEAT_VTP) && defined(FEAT_TERMGUICOLORS)
		    if (use_vtp())
		    {
			if (do_ME_fg && do_ME_bg)
			    do_ME = TRUE;

			// FG and BG cannot be separated in T_ME, which is not
			// efficient.
			if (!do_ME && do_ME_fg)
			    out_str((char_u *)"\033|39m"); // restore FG
			if (!do_ME && do_ME_bg)
			    out_str((char_u *)"\033|49m"); // restore BG
		    }
		    else
		    {
			// Process FG and BG at once.
			if (!do_ME)
			    do_ME = do_ME_fg | do_ME_bg;
		    }
#endif
		}
		else
		{
		    aep = syn_term_attr2entry(screen_attr);
		    if (aep != NULL && aep->ae_u.term.stop != NULL)
		    {
			if (STRCMP(aep->ae_u.term.stop, T_ME) == 0)
			    do_ME = TRUE;
			else
			    out_str(aep->ae_u.term.stop);
		    }
		}
		if (aep == NULL)	    // did ":syntax clear"
		    screen_attr = 0;
		else
		    screen_attr = aep->ae_attr;
	    }

	    /*
	     * Often all ending-codes are equal to T_ME.  Avoid outputting the
	     * same sequence several times.
	     */
	    if (screen_attr & HL_STANDOUT)
	    {
		if (STRCMP(T_SE, T_ME) == 0)
		    do_ME = TRUE;
		else
		    out_str(T_SE);
	    }
	    if ((screen_attr & HL_UNDERCURL) && *T_UCE != NUL)
	    {
		if (STRCMP(T_UCE, T_ME) == 0)
		    do_ME = TRUE;
		else
		    out_str(T_UCE);
	    }
	    if ((screen_attr & HL_UNDERLINE)
			    || ((screen_attr & HL_UNDERCURL) && *T_UCE == NUL))
	    {
		if (STRCMP(T_UE, T_ME) == 0)
		    do_ME = TRUE;
		else
		    out_str(T_UE);
	    }
	    if (screen_attr & HL_ITALIC)
	    {
		if (STRCMP(T_CZR, T_ME) == 0)
		    do_ME = TRUE;
		else
		    out_str(T_CZR);
	    }
	    if (screen_attr & HL_STRIKETHROUGH)
	    {
		if (STRCMP(T_STE, T_ME) == 0)
		    do_ME = TRUE;
		else
		    out_str(T_STE);
	    }
	    if (do_ME || (screen_attr & (HL_BOLD | HL_INVERSE)))
		out_str(T_ME);

#ifdef FEAT_TERMGUICOLORS
	    if (p_tgc)
	    {
		if (cterm_normal_fg_gui_color != INVALCOLOR)
		    term_fg_rgb_color(cterm_normal_fg_gui_color);
		if (cterm_normal_bg_gui_color != INVALCOLOR)
		    term_bg_rgb_color(cterm_normal_bg_gui_color);
		if (cterm_normal_ul_gui_color != INVALCOLOR)
		    term_ul_rgb_color(cterm_normal_ul_gui_color);
	    }
	    else
#endif
	    {
		if (t_colors > 1)
		{
		    // set Normal cterm colors
		    if (cterm_normal_fg_color != 0)
			term_fg_color(cterm_normal_fg_color - 1);
		    if (cterm_normal_bg_color != 0)
			term_bg_color(cterm_normal_bg_color - 1);
		    if (cterm_normal_ul_color != 0)
			term_ul_color(cterm_normal_ul_color - 1);
		    if (cterm_normal_fg_bold)
			out_str(T_MD);
		}
	    }
	}
    }
    screen_attr = 0;
}

/*
 * Reset the colors for a cterm.  Used when leaving Vim.
 * The machine specific code may override this again.
 */
    void
reset_cterm_colors(void)
{
    if (IS_CTERM)
    {
	// set Normal cterm colors
#ifdef FEAT_TERMGUICOLORS
	if (p_tgc ? (cterm_normal_fg_gui_color != INVALCOLOR
		 || cterm_normal_bg_gui_color != INVALCOLOR)
		: (cterm_normal_fg_color > 0 || cterm_normal_bg_color > 0))
#else
	if (cterm_normal_fg_color > 0 || cterm_normal_bg_color > 0)
#endif
	{
	    out_str(T_OP);
	    screen_attr = -1;
	}
	if (cterm_normal_fg_bold)
	{
	    out_str(T_ME);
	    screen_attr = -1;
	}
    }
}

/*
 * Put character ScreenLines["off"] on the screen at position "row" and "col",
 * using the attributes from ScreenAttrs["off"].
 */
    void
screen_char(unsigned off, int row, int col)
{
    int		attr;

    // Check for illegal values, just in case (could happen just after
    // resizing).
    if (row >= screen_Rows || col >= screen_Columns)
	return;

    // Skip if under the popup menu.
    // Popup windows with zindex higher than POPUPMENU_ZINDEX go on top.
    if (pum_under_menu(row, col)
#ifdef FEAT_PROP_POPUP
	    && screen_zindex <= POPUPMENU_ZINDEX
#endif
	    )
	return;
#ifdef FEAT_PROP_POPUP
    if (blocked_by_popup(row, col))
	return;
#endif

    // Outputting a character in the last cell on the screen may scroll the
    // screen up.  Only do it when the "xn" termcap property is set, otherwise
    // mark the character invalid (update it when scrolled up).
    if (*T_XN == NUL
	    && row == screen_Rows - 1 && col == screen_Columns - 1
#ifdef FEAT_RIGHTLEFT
	    // account for first command-line character in rightleft mode
	    && !cmdmsg_rl
#endif
       )
    {
	ScreenAttrs[off] = (sattr_T)-1;
	return;
    }

    /*
     * Stop highlighting first, so it's easier to move the cursor.
     */
    if (screen_char_attr != 0)
	attr = screen_char_attr;
    else
	attr = ScreenAttrs[off];
    if (screen_attr != attr)
	screen_stop_highlight();

    windgoto(row, col);

    if (screen_attr != attr)
	screen_start_highlight(attr);

    if (enc_utf8 && ScreenLinesUC[off] != 0)
    {
	char_u	    buf[MB_MAXBYTES + 1];

	if (utf_ambiguous_width(ScreenLinesUC[off]))
	{
	    if (*p_ambw == 'd'
#ifdef FEAT_GUI
		    && !gui.in_use
#endif
		    )
	    {
		// Clear the two screen cells. If the character is actually
		// single width it won't change the second cell.
		out_str((char_u *)"  ");
		term_windgoto(row, col);
	    }
	    // not sure where the cursor is after drawing the ambiguous width
	    // character
	    screen_cur_col = 9999;
	}
	else if (utf_char2cells(ScreenLinesUC[off]) > 1)
	    ++screen_cur_col;

	// Convert the UTF-8 character to bytes and write it.
	buf[utfc_char2bytes(off, buf)] = NUL;
	out_str(buf);
    }
    else
    {
	out_flush_check();
	out_char(ScreenLines[off]);
	// double-byte character in single-width cell
	if (enc_dbcs == DBCS_JPNU && ScreenLines[off] == 0x8e)
	    out_char(ScreenLines2[off]);
    }

    screen_cur_col++;
}

/*
 * Used for enc_dbcs only: Put one double-wide character at ScreenLines["off"]
 * on the screen at position 'row' and 'col'.
 * The attributes of the first byte is used for all.  This is required to
 * output the two bytes of a double-byte character with nothing in between.
 */
    static void
screen_char_2(unsigned off, int row, int col)
{
    // Check for illegal values (could be wrong when screen was resized).
    if (off + 1 >= (unsigned)(screen_Rows * screen_Columns))
	return;

    // Outputting the last character on the screen may scrollup the screen.
    // Don't to it!  Mark the character invalid (update it when scrolled up)
    if (row == screen_Rows - 1 && col >= screen_Columns - 2)
    {
	ScreenAttrs[off] = (sattr_T)-1;
	return;
    }

    // Output the first byte normally (positions the cursor), then write the
    // second byte directly.
    screen_char(off, row, col);
    out_char(ScreenLines[off + 1]);
    ++screen_cur_col;
}

/*
 * Draw a rectangle of the screen, inverted when "invert" is TRUE.
 * This uses the contents of ScreenLines[] and doesn't change it.
 */
    void
screen_draw_rectangle(
    int		row,
    int		col,
    int		height,
    int		width,
    int		invert)
{
    int		r, c;
    int		off;
    int		max_off;

    // Can't use ScreenLines unless initialized
    if (ScreenLines == NULL)
	return;

    if (invert)
	screen_char_attr = HL_INVERSE;
    for (r = row; r < row + height; ++r)
    {
	off = LineOffset[r];
	max_off = off + screen_Columns;
	for (c = col; c < col + width; ++c)
	{
	    if (enc_dbcs != 0 && dbcs_off2cells(off + c, max_off) > 1)
	    {
		screen_char_2(off + c, r, c);
		++c;
	    }
	    else
	    {
		screen_char(off + c, r, c);
		if (utf_off2cells(off + c, max_off) > 1)
		    ++c;
	    }
	}
    }
    screen_char_attr = 0;
}

/*
 * Redraw the characters for a vertically split window.
 */
    static void
redraw_block(int row, int end, win_T *wp)
{
    int		col;
    int		width;

# ifdef FEAT_CLIPBOARD
    clip_may_clear_selection(row, end - 1);
# endif

    if (wp == NULL)
    {
	col = 0;
	width = Columns;
    }
    else
    {
	col = wp->w_wincol;
	width = wp->w_width;
    }
    screen_draw_rectangle(row, col, end - row, width, FALSE);
}

    void
space_to_screenline(int off, int attr)
{
    ScreenLines[off] = ' ';
    ScreenAttrs[off] = attr;
    if (enc_utf8)
	ScreenLinesUC[off] = 0;
}

/*
 * Fill the screen from 'start_row' to 'end_row', from 'start_col' to 'end_col'
 * with character 'c1' in first column followed by 'c2' in the other columns.
 * Use attributes 'attr'.
 */
    void
screen_fill(
	int	start_row,
	int	end_row,
	int	start_col,
	int	end_col,
	int	c1,
	int	c2,
	int	attr)
{
    int	    row;
    int	    col;
    int	    off;
    int	    end_off;
    int	    did_delete;
    int	    c;
    int	    norm_term;
#if defined(FEAT_GUI) || defined(UNIX)
    int	    force_next = FALSE;
#endif

    if (end_row > screen_Rows)		// safety check
	end_row = screen_Rows;
    if (end_col > screen_Columns)	// safety check
	end_col = screen_Columns;
    if (ScreenLines == NULL
	    || start_row >= end_row
	    || start_col >= end_col)	// nothing to do
	return;

    // it's a "normal" terminal when not in a GUI or cterm
    norm_term = (
#ifdef FEAT_GUI
	    !gui.in_use &&
#endif
	    !IS_CTERM);
    for (row = start_row; row < end_row; ++row)
    {
	if (has_mbyte
#ifdef FEAT_GUI
		&& !gui.in_use
#endif
	   )
	{
	    // When drawing over the right halve of a double-wide char clear
	    // out the left halve.  When drawing over the left halve of a
	    // double wide-char clear out the right halve.  Only needed in a
	    // terminal.
	    if (start_col > 0 && mb_fix_col(start_col, row) != start_col)
		screen_puts_len((char_u *)" ", 1, row, start_col - 1, 0);
	    if (end_col < screen_Columns && mb_fix_col(end_col, row) != end_col)
		screen_puts_len((char_u *)" ", 1, row, end_col, 0);
	}
	/*
	 * Try to use delete-line termcap code, when no attributes or in a
	 * "normal" terminal, where a bold/italic space is just a
	 * space.
	 */
	did_delete = FALSE;
	if (c2 == ' '
		&& end_col == Columns
		&& can_clear(T_CE)
		&& (attr == 0
		    || (norm_term
			&& attr <= HL_ALL
			&& ((attr & ~(HL_BOLD | HL_ITALIC)) == 0))))
	{
	    /*
	     * check if we really need to clear something
	     */
	    col = start_col;
	    if (c1 != ' ')			// don't clear first char
		++col;

	    off = LineOffset[row] + col;
	    end_off = LineOffset[row] + end_col;

	    // skip blanks (used often, keep it fast!)
	    if (enc_utf8)
		while (off < end_off && ScreenLines[off] == ' '
			  && ScreenAttrs[off] == 0 && ScreenLinesUC[off] == 0)
		    ++off;
	    else
		while (off < end_off && ScreenLines[off] == ' '
						     && ScreenAttrs[off] == 0)
		    ++off;
	    if (off < end_off)		// something to be cleared
	    {
		col = off - LineOffset[row];
		screen_stop_highlight();
		term_windgoto(row, col);// clear rest of this screen line
		out_str(T_CE);
		screen_start();		// don't know where cursor is now
		col = end_col - col;
		while (col--)		// clear chars in ScreenLines
		{
		    space_to_screenline(off, 0);
		    ++off;
		}
	    }
	    did_delete = TRUE;		// the chars are cleared now
	}

	off = LineOffset[row] + start_col;
	c = c1;
	for (col = start_col; col < end_col; ++col)
	{
	    if ((ScreenLines[off] != c
		    || (enc_utf8 && (int)ScreenLinesUC[off]
						       != (c >= 0x80 ? c : 0))
		    || ScreenAttrs[off] != attr
#if defined(FEAT_GUI) || defined(UNIX)
		    || force_next
#endif
		    )
#ifdef FEAT_PROP_POPUP
		    // Skip if under a(nother) popup.
		    && !blocked_by_popup(row, col)
#endif
	       )
	    {
#if defined(FEAT_GUI) || defined(UNIX)
		// The bold trick may make a single row of pixels appear in
		// the next character.  When a bold character is removed, the
		// next character should be redrawn too.  This happens for our
		// own GUI and for some xterms.
		if (
# ifdef FEAT_GUI
			gui.in_use
# endif
# if defined(FEAT_GUI) && defined(UNIX)
			||
# endif
# ifdef UNIX
			term_is_xterm
# endif
		   )
		{
		    if (ScreenLines[off] != ' '
			    && (ScreenAttrs[off] > HL_ALL
				|| ScreenAttrs[off] & HL_BOLD))
			force_next = TRUE;
		    else
			force_next = FALSE;
		}
#endif
		ScreenLines[off] = c;
		if (enc_utf8)
		{
		    if (c >= 0x80)
		    {
			ScreenLinesUC[off] = c;
			ScreenLinesC[0][off] = 0;
		    }
		    else
			ScreenLinesUC[off] = 0;
		}
		ScreenAttrs[off] = attr;
		if (!did_delete || c != ' ')
		    screen_char(off, row, col);
	    }
	    ++off;
	    if (col == start_col)
	    {
		if (did_delete)
		    break;
		c = c2;
	    }
	}
	if (end_col == Columns)
	    LineWraps[row] = FALSE;
	if (row == Rows - 1)		// overwritten the command line
	{
	    redraw_cmdline = TRUE;
	    if (start_col == 0 && end_col == Columns
		    && c1 == ' ' && c2 == ' ' && attr == 0)
		clear_cmdline = FALSE;	// command line has been cleared
	    if (start_col == 0)
		mode_displayed = FALSE; // mode cleared or overwritten
	}
    }
}

/*
 * Check if there should be a delay.  Used before clearing or redrawing the
 * screen or the command line.
 */
    void
check_for_delay(int check_msg_scroll)
{
    if ((emsg_on_display || (check_msg_scroll && msg_scroll))
	    && !did_wait_return
	    && emsg_silent == 0
	    && !in_assert_fails)
    {
	out_flush();
	ui_delay(1006L, TRUE);
	emsg_on_display = FALSE;
	if (check_msg_scroll)
	    msg_scroll = FALSE;
    }
}

/*
 * Init TabPageIdxs[] to zero: Clicking outside of tabs has no effect.
 */
    static void
clear_TabPageIdxs(void)
{
    int		scol;

    for (scol = 0; scol < Columns; ++scol)
	TabPageIdxs[scol] = 0;
}

/*
 * screen_valid -  allocate screen buffers if size changed
 *   If "doclear" is TRUE: clear screen if it has been resized.
 *	Returns TRUE if there is a valid screen to write to.
 *	Returns FALSE when starting up and screen not initialized yet.
 */
    int
screen_valid(int doclear)
{
    screenalloc(doclear);	   // allocate screen buffers if size changed
    return (ScreenLines != NULL);
}

/*
 * Resize the shell to Rows and Columns.
 * Allocate ScreenLines[] and associated items.
 *
 * There may be some time between setting Rows and Columns and (re)allocating
 * ScreenLines[].  This happens when starting up and when (manually) changing
 * the shell size.  Always use screen_Rows and screen_Columns to access items
 * in ScreenLines[].  Use Rows and Columns for positioning text etc. where the
 * final size of the shell is needed.
 */
    void
screenalloc(int doclear)
{
    int		    new_row, old_row;
#ifdef FEAT_GUI
    int		    old_Rows;
#endif
    win_T	    *wp;
    int		    outofmem = FALSE;
    int		    len;
    schar_T	    *new_ScreenLines;
    u8char_T	    *new_ScreenLinesUC = NULL;
    u8char_T	    *new_ScreenLinesC[MAX_MCO];
    schar_T	    *new_ScreenLines2 = NULL;
    int		    i;
    sattr_T	    *new_ScreenAttrs;
    unsigned	    *new_LineOffset;
    char_u	    *new_LineWraps;
    short	    *new_TabPageIdxs;
#ifdef FEAT_PROP_POPUP
    short	    *new_popup_mask;
    short	    *new_popup_mask_next;
    char	    *new_popup_transparent;
#endif
    tabpage_T	    *tp;
    static int	    entered = FALSE;		// avoid recursiveness
    static int	    done_outofmem_msg = FALSE;	// did outofmem message
    int		    retry_count = 0;

retry:
    /*
     * Allocation of the screen buffers is done only when the size changes and
     * when Rows and Columns have been set and we have started doing full
     * screen stuff.
     */
    if ((ScreenLines != NULL
		&& Rows == screen_Rows
		&& Columns == screen_Columns
		&& enc_utf8 == (ScreenLinesUC != NULL)
		&& (enc_dbcs == DBCS_JPNU) == (ScreenLines2 != NULL)
		&& p_mco == Screen_mco)
	    || Rows == 0
	    || Columns == 0
	    || (!full_screen && ScreenLines == NULL))
	return;

    /*
     * It's possible that we produce an out-of-memory message below, which
     * will cause this function to be called again.  To break the loop, just
     * return here.
     */
    if (entered)
	return;
    entered = TRUE;

    /*
     * Note that the window sizes are updated before reallocating the arrays,
     * thus we must not redraw here!
     */
    ++RedrawingDisabled;

    win_new_shellsize();    // fit the windows in the new sized shell

#ifdef FEAT_GUI_HAIKU
    vim_lock_screen();  // be safe, put it here
#endif

    comp_col();		// recompute columns for shown command and ruler

    /*
     * We're changing the size of the screen.
     * - Allocate new arrays for ScreenLines and ScreenAttrs.
     * - Move lines from the old arrays into the new arrays, clear extra
     *	 lines (unless the screen is going to be cleared).
     * - Free the old arrays.
     *
     * If anything fails, make ScreenLines NULL, so we don't do anything!
     * Continuing with the old ScreenLines may result in a crash, because the
     * size is wrong.
     */
    FOR_ALL_TAB_WINDOWS(tp, wp)
	win_free_lsize(wp);
    if (aucmd_win != NULL)
	win_free_lsize(aucmd_win);
#ifdef FEAT_PROP_POPUP
    // global popup windows
    FOR_ALL_POPUPWINS(wp)
	win_free_lsize(wp);
    // tab-local popup windows
    FOR_ALL_TABPAGES(tp)
	FOR_ALL_POPUPWINS_IN_TAB(tp, wp)
	    win_free_lsize(wp);
#endif

    new_ScreenLines = LALLOC_MULT(schar_T, (Rows + 1) * Columns);
    vim_memset(new_ScreenLinesC, 0, sizeof(u8char_T *) * MAX_MCO);
    if (enc_utf8)
    {
	new_ScreenLinesUC = LALLOC_MULT(u8char_T, (Rows + 1) * Columns);
	for (i = 0; i < p_mco; ++i)
	    new_ScreenLinesC[i] = LALLOC_CLEAR_MULT(u8char_T,
							 (Rows + 1) * Columns);
    }
    if (enc_dbcs == DBCS_JPNU)
	new_ScreenLines2 = LALLOC_MULT(schar_T, (Rows + 1) * Columns);
    new_ScreenAttrs = LALLOC_MULT(sattr_T, (Rows + 1) * Columns);
    new_LineOffset = LALLOC_MULT(unsigned, Rows);
    new_LineWraps = LALLOC_MULT(char_u, Rows);
    new_TabPageIdxs = LALLOC_MULT(short, Columns);
#ifdef FEAT_PROP_POPUP
    new_popup_mask = LALLOC_MULT(short, Rows * Columns);
    new_popup_mask_next = LALLOC_MULT(short, Rows * Columns);
    new_popup_transparent = LALLOC_MULT(char, Rows * Columns);
#endif

    FOR_ALL_TAB_WINDOWS(tp, wp)
    {
	if (win_alloc_lines(wp) == FAIL)
	{
	    outofmem = TRUE;
	    goto give_up;
	}
    }
    if (aucmd_win != NULL && aucmd_win->w_lines == NULL
					&& win_alloc_lines(aucmd_win) == FAIL)
	outofmem = TRUE;
#ifdef FEAT_PROP_POPUP
    // global popup windows
    FOR_ALL_POPUPWINS(wp)
	if (win_alloc_lines(wp) == FAIL)
	{
	    outofmem = TRUE;
	    goto give_up;
	}
    // tab-local popup windows
    FOR_ALL_TABPAGES(tp)
	FOR_ALL_POPUPWINS_IN_TAB(tp, wp)
	    if (win_alloc_lines(wp) == FAIL)
	    {
		outofmem = TRUE;
		goto give_up;
	    }
#endif

give_up:

    for (i = 0; i < p_mco; ++i)
	if (new_ScreenLinesC[i] == NULL)
	    break;
    if (new_ScreenLines == NULL
	    || (enc_utf8 && (new_ScreenLinesUC == NULL || i != p_mco))
	    || (enc_dbcs == DBCS_JPNU && new_ScreenLines2 == NULL)
	    || new_ScreenAttrs == NULL
	    || new_LineOffset == NULL
	    || new_LineWraps == NULL
	    || new_TabPageIdxs == NULL
#ifdef FEAT_PROP_POPUP
	    || new_popup_mask == NULL
	    || new_popup_mask_next == NULL
	    || new_popup_transparent == NULL
#endif
	    || outofmem)
    {
	if (ScreenLines != NULL || !done_outofmem_msg)
	{
	    // guess the size
	    do_outofmem_msg((long_u)((Rows + 1) * Columns));

	    // Remember we did this to avoid getting outofmem messages over
	    // and over again.
	    done_outofmem_msg = TRUE;
	}
	VIM_CLEAR(new_ScreenLines);
	VIM_CLEAR(new_ScreenLinesUC);
	for (i = 0; i < p_mco; ++i)
	    VIM_CLEAR(new_ScreenLinesC[i]);
	VIM_CLEAR(new_ScreenLines2);
	VIM_CLEAR(new_ScreenAttrs);
	VIM_CLEAR(new_LineOffset);
	VIM_CLEAR(new_LineWraps);
	VIM_CLEAR(new_TabPageIdxs);
#ifdef FEAT_PROP_POPUP
	VIM_CLEAR(new_popup_mask);
	VIM_CLEAR(new_popup_mask_next);
	VIM_CLEAR(new_popup_transparent);
#endif
    }
    else
    {
	done_outofmem_msg = FALSE;

	for (new_row = 0; new_row < Rows; ++new_row)
	{
	    new_LineOffset[new_row] = new_row * Columns;
	    new_LineWraps[new_row] = FALSE;

	    /*
	     * If the screen is not going to be cleared, copy as much as
	     * possible from the old screen to the new one and clear the rest
	     * (used when resizing the window at the "--more--" prompt or when
	     * executing an external command, for the GUI).
	     */
	    if (!doclear)
	    {
		(void)vim_memset(new_ScreenLines + new_row * Columns,
				      ' ', (size_t)Columns * sizeof(schar_T));
		if (enc_utf8)
		{
		    (void)vim_memset(new_ScreenLinesUC + new_row * Columns,
				       0, (size_t)Columns * sizeof(u8char_T));
		    for (i = 0; i < p_mco; ++i)
			(void)vim_memset(new_ScreenLinesC[i]
							  + new_row * Columns,
				       0, (size_t)Columns * sizeof(u8char_T));
		}
		if (enc_dbcs == DBCS_JPNU)
		    (void)vim_memset(new_ScreenLines2 + new_row * Columns,
				       0, (size_t)Columns * sizeof(schar_T));
		(void)vim_memset(new_ScreenAttrs + new_row * Columns,
					0, (size_t)Columns * sizeof(sattr_T));
		old_row = new_row + (screen_Rows - Rows);
		if (old_row >= 0 && ScreenLines != NULL)
		{
		    if (screen_Columns < Columns)
			len = screen_Columns;
		    else
			len = Columns;
		    // When switching to utf-8 don't copy characters, they
		    // may be invalid now.  Also when p_mco changes.
		    if (!(enc_utf8 && ScreenLinesUC == NULL)
						       && p_mco == Screen_mco)
			mch_memmove(new_ScreenLines + new_LineOffset[new_row],
				ScreenLines + LineOffset[old_row],
				(size_t)len * sizeof(schar_T));
		    if (enc_utf8 && ScreenLinesUC != NULL
						       && p_mco == Screen_mco)
		    {
			mch_memmove(new_ScreenLinesUC + new_LineOffset[new_row],
				ScreenLinesUC + LineOffset[old_row],
				(size_t)len * sizeof(u8char_T));
			for (i = 0; i < p_mco; ++i)
			    mch_memmove(new_ScreenLinesC[i]
						    + new_LineOffset[new_row],
				ScreenLinesC[i] + LineOffset[old_row],
				(size_t)len * sizeof(u8char_T));
		    }
		    if (enc_dbcs == DBCS_JPNU && ScreenLines2 != NULL)
			mch_memmove(new_ScreenLines2 + new_LineOffset[new_row],
				ScreenLines2 + LineOffset[old_row],
				(size_t)len * sizeof(schar_T));
		    mch_memmove(new_ScreenAttrs + new_LineOffset[new_row],
			    ScreenAttrs + LineOffset[old_row],
			    (size_t)len * sizeof(sattr_T));
		}
	    }
	}
	// Use the last line of the screen for the current line.
	current_ScreenLine = new_ScreenLines + Rows * Columns;

#ifdef FEAT_PROP_POPUP
	vim_memset(new_popup_mask, 0, Rows * Columns * sizeof(short));
	vim_memset(new_popup_transparent, 0, Rows * Columns * sizeof(char));
#endif
    }

    free_screenlines();

    // NOTE: this may result in all pointers to become NULL.
    ScreenLines = new_ScreenLines;
    ScreenLinesUC = new_ScreenLinesUC;
    for (i = 0; i < p_mco; ++i)
	ScreenLinesC[i] = new_ScreenLinesC[i];
    Screen_mco = p_mco;
    ScreenLines2 = new_ScreenLines2;
    ScreenAttrs = new_ScreenAttrs;
    LineOffset = new_LineOffset;
    LineWraps = new_LineWraps;
    TabPageIdxs = new_TabPageIdxs;
#ifdef FEAT_PROP_POPUP
    popup_mask = new_popup_mask;
    popup_mask_next = new_popup_mask_next;
    popup_transparent = new_popup_transparent;
    popup_mask_refresh = TRUE;
#endif

    // It's important that screen_Rows and screen_Columns reflect the actual
    // size of ScreenLines[].  Set them before calling anything.
#ifdef FEAT_GUI
    old_Rows = screen_Rows;
#endif
    screen_Rows = Rows;
    screen_Columns = Columns;

    must_redraw = CLEAR;	// need to clear the screen later
    if (doclear)
	screenclear2();
#ifdef FEAT_GUI
    else if (gui.in_use
	    && !gui.starting
	    && ScreenLines != NULL
	    && old_Rows != Rows)
    {
	gui_redraw_block(0, 0, (int)Rows - 1, (int)Columns - 1, 0);

	// Adjust the position of the cursor, for when executing an external
	// command.
	if (msg_row >= Rows)		// Rows got smaller
	    msg_row = Rows - 1;		// put cursor at last row
	else if (Rows > old_Rows)	// Rows got bigger
	    msg_row += Rows - old_Rows; // put cursor in same place
	if (msg_col >= Columns)		// Columns got smaller
	    msg_col = Columns - 1;	// put cursor at last column
    }
#endif
    clear_TabPageIdxs();

#ifdef FEAT_GUI_HAIKU
    vim_unlock_screen();
#endif

    entered = FALSE;
    --RedrawingDisabled;

    /*
     * Do not apply autocommands more than 3 times to avoid an endless loop
     * in case applying autocommands always changes Rows or Columns.
     */
    if (starting == 0 && ++retry_count <= 3)
    {
	apply_autocmds(EVENT_VIMRESIZED, NULL, NULL, FALSE, curbuf);
	// In rare cases, autocommands may have altered Rows or Columns,
	// jump back to check if we need to allocate the screen again.
	goto retry;
    }
}

    void
free_screenlines(void)
{
    int		i;

    VIM_CLEAR(ScreenLinesUC);
    for (i = 0; i < Screen_mco; ++i)
	VIM_CLEAR(ScreenLinesC[i]);
    VIM_CLEAR(ScreenLines2);
    VIM_CLEAR(ScreenLines);
    VIM_CLEAR(ScreenAttrs);
    VIM_CLEAR(LineOffset);
    VIM_CLEAR(LineWraps);
    VIM_CLEAR(TabPageIdxs);
#ifdef FEAT_PROP_POPUP
    VIM_CLEAR(popup_mask);
    VIM_CLEAR(popup_mask_next);
    VIM_CLEAR(popup_transparent);
#endif
}

    void
screenclear(void)
{
    check_for_delay(FALSE);
    screenalloc(FALSE);	    // allocate screen buffers if size changed
    screenclear2();	    // clear the screen
}

    static void
screenclear2(void)
{
    int	    i;

    if (starting == NO_SCREEN || ScreenLines == NULL
#ifdef FEAT_GUI
	    || (gui.in_use && gui.starting)
#endif
	    )
	return;

#ifdef FEAT_GUI
    if (!gui.in_use)
#endif
	screen_attr = -1;	// force setting the Normal colors
    screen_stop_highlight();	// don't want highlighting here

#ifdef FEAT_CLIPBOARD
    // disable selection without redrawing it
    clip_scroll_selection(9999);
#endif

    // blank out ScreenLines
    for (i = 0; i < Rows; ++i)
    {
	lineclear(LineOffset[i], (int)Columns, 0);
	LineWraps[i] = FALSE;
    }

    if (can_clear(T_CL))
    {
	out_str(T_CL);		// clear the display
	clear_cmdline = FALSE;
	mode_displayed = FALSE;
    }
    else
    {
	// can't clear the screen, mark all chars with invalid attributes
	for (i = 0; i < Rows; ++i)
	    lineinvalid(LineOffset[i], (int)Columns);
	clear_cmdline = TRUE;
    }

    screen_cleared = TRUE;	// can use contents of ScreenLines now

    win_rest_invalid(firstwin);
    redraw_cmdline = TRUE;
    redraw_tabline = TRUE;
    if (must_redraw == CLEAR)	// no need to clear again
	must_redraw = NOT_VALID;
    compute_cmdrow();
    msg_row = cmdline_row;	// put cursor on last line for messages
    msg_col = 0;
    screen_start();		// don't know where cursor is now
    msg_scrolled = 0;		// can't scroll back
    msg_didany = FALSE;
    msg_didout = FALSE;
}

/*
 * Clear one line in ScreenLines.
 */
    static void
lineclear(unsigned off, int width, int attr)
{
    (void)vim_memset(ScreenLines + off, ' ', (size_t)width * sizeof(schar_T));
    if (enc_utf8)
	(void)vim_memset(ScreenLinesUC + off, 0,
					  (size_t)width * sizeof(u8char_T));
    (void)vim_memset(ScreenAttrs + off, attr, (size_t)width * sizeof(sattr_T));
}

/*
 * Mark one line in ScreenLines invalid by setting the attributes to an
 * invalid value.
 */
    static void
lineinvalid(unsigned off, int width)
{
    (void)vim_memset(ScreenAttrs + off, -1, (size_t)width * sizeof(sattr_T));
}

/*
 * To be called when characters were sent to the terminal directly, outputting
 * test on "screen_lnum".
 */
    void
line_was_clobbered(int screen_lnum)
{
    lineinvalid(LineOffset[screen_lnum], (int)Columns);
}

/*
 * Copy part of a Screenline for vertically split window "wp".
 */
    static void
linecopy(int to, int from, win_T *wp)
{
    unsigned	off_to = LineOffset[to] + wp->w_wincol;
    unsigned	off_from = LineOffset[from] + wp->w_wincol;

    mch_memmove(ScreenLines + off_to, ScreenLines + off_from,
	    wp->w_width * sizeof(schar_T));
    if (enc_utf8)
    {
	int	i;

	mch_memmove(ScreenLinesUC + off_to, ScreenLinesUC + off_from,
		wp->w_width * sizeof(u8char_T));
	for (i = 0; i < p_mco; ++i)
	    mch_memmove(ScreenLinesC[i] + off_to, ScreenLinesC[i] + off_from,
		    wp->w_width * sizeof(u8char_T));
    }
    if (enc_dbcs == DBCS_JPNU)
	mch_memmove(ScreenLines2 + off_to, ScreenLines2 + off_from,
		wp->w_width * sizeof(schar_T));
    mch_memmove(ScreenAttrs + off_to, ScreenAttrs + off_from,
	    wp->w_width * sizeof(sattr_T));
}

/*
 * Return TRUE if clearing with term string "p" would work.
 * It can't work when the string is empty or it won't set the right background.
 * Don't clear to end-of-line when there are popups, it may cause flicker.
 */
    int
can_clear(char_u *p)
{
    return (*p != NUL && (t_colors <= 1
#ifdef FEAT_GUI
		|| gui.in_use
#endif
#ifdef FEAT_TERMGUICOLORS
		|| (p_tgc && cterm_normal_bg_gui_color == INVALCOLOR)
		|| (!p_tgc && cterm_normal_bg_color == 0)
#else
		|| cterm_normal_bg_color == 0
#endif
		|| *T_UT != NUL)
#ifdef FEAT_PROP_POPUP
	    && !(p == T_CE && popup_visible)
#endif
	    );
}

/*
 * Reset cursor position. Use whenever cursor was moved because of outputting
 * something directly to the screen (shell commands) or a terminal control
 * code.
 */
    void
screen_start(void)
{
    screen_cur_row = screen_cur_col = 9999;
}

/*
 * Move the cursor to position "row","col" in the screen.
 * This tries to find the most efficient way to move, minimizing the number of
 * characters sent to the terminal.
 */
    void
windgoto(int row, int col)
{
    sattr_T	    *p;
    int		    i;
    int		    plan;
    int		    cost;
    int		    wouldbe_col;
    int		    noinvcurs;
    char_u	    *bs;
    int		    goto_cost;
    int		    attr;

#define GOTO_COST   7	// assume a term_windgoto() takes about 7 chars
#define HIGHL_COST  5	// assume unhighlight takes 5 chars

#define PLAN_LE	    1
#define PLAN_CR	    2
#define PLAN_NL	    3
#define PLAN_WRITE  4
    // Can't use ScreenLines unless initialized
    if (ScreenLines == NULL)
	return;
    if (col != screen_cur_col || row != screen_cur_row)
    {
	// Check for valid position.
	if (row < 0)	// window without text lines?
	    row = 0;
	if (row >= screen_Rows)
	    row = screen_Rows - 1;
	if (col >= screen_Columns)
	    col = screen_Columns - 1;

	// check if no cursor movement is allowed in highlight mode
	if (screen_attr && *T_MS == NUL)
	    noinvcurs = HIGHL_COST;
	else
	    noinvcurs = 0;
	goto_cost = GOTO_COST + noinvcurs;

	/*
	 * Plan how to do the positioning:
	 * 1. Use CR to move it to column 0, same row.
	 * 2. Use T_LE to move it a few columns to the left.
	 * 3. Use NL to move a few lines down, column 0.
	 * 4. Move a few columns to the right with T_ND or by writing chars.
	 *
	 * Don't do this if the cursor went beyond the last column, the cursor
	 * position is unknown then (some terminals wrap, some don't )
	 *
	 * First check if the highlighting attributes allow us to write
	 * characters to move the cursor to the right.
	 */
	if (row >= screen_cur_row && screen_cur_col < Columns)
	{
	    /*
	     * If the cursor is in the same row, bigger col, we can use CR
	     * or T_LE.
	     */
	    bs = NULL;			    // init for GCC
	    attr = screen_attr;
	    if (row == screen_cur_row && col < screen_cur_col)
	    {
		// "le" is preferred over "bc", because "bc" is obsolete
		if (*T_LE)
		    bs = T_LE;		    // "cursor left"
		else
		    bs = T_BC;		    // "backspace character (old)
		if (*bs)
		    cost = (screen_cur_col - col) * (int)STRLEN(bs);
		else
		    cost = 999;
		if (col + 1 < cost)	    // using CR is less characters
		{
		    plan = PLAN_CR;
		    wouldbe_col = 0;
		    cost = 1;		    // CR is just one character
		}
		else
		{
		    plan = PLAN_LE;
		    wouldbe_col = col;
		}
		if (noinvcurs)		    // will stop highlighting
		{
		    cost += noinvcurs;
		    attr = 0;
		}
	    }

	    /*
	     * If the cursor is above where we want to be, we can use CR LF.
	     */
	    else if (row > screen_cur_row)
	    {
		plan = PLAN_NL;
		wouldbe_col = 0;
		cost = (row - screen_cur_row) * 2;  // CR LF
		if (noinvcurs)		    // will stop highlighting
		{
		    cost += noinvcurs;
		    attr = 0;
		}
	    }

	    /*
	     * If the cursor is in the same row, smaller col, just use write.
	     */
	    else
	    {
		plan = PLAN_WRITE;
		wouldbe_col = screen_cur_col;
		cost = 0;
	    }

	    /*
	     * Check if any characters that need to be written have the
	     * correct attributes.  Also avoid UTF-8 characters.
	     */
	    i = col - wouldbe_col;
	    if (i > 0)
		cost += i;
	    if (cost < goto_cost && i > 0)
	    {
		/*
		 * Check if the attributes are correct without additionally
		 * stopping highlighting.
		 */
		p = ScreenAttrs + LineOffset[row] + wouldbe_col;
		while (i && *p++ == attr)
		    --i;
		if (i != 0)
		{
		    /*
		     * Try if it works when highlighting is stopped here.
		     */
		    if (*--p == 0)
		    {
			cost += noinvcurs;
			while (i && *p++ == 0)
			    --i;
		    }
		    if (i != 0)
			cost = 999;	// different attributes, don't do it
		}
		if (enc_utf8)
		{
		    // Don't use an UTF-8 char for positioning, it's slow.
		    for (i = wouldbe_col; i < col; ++i)
			if (ScreenLinesUC[LineOffset[row] + i] != 0)
			{
			    cost = 999;
			    break;
			}
		}
	    }

	    /*
	     * We can do it without term_windgoto()!
	     */
	    if (cost < goto_cost)
	    {
		if (plan == PLAN_LE)
		{
		    if (noinvcurs)
			screen_stop_highlight();
		    while (screen_cur_col > col)
		    {
			out_str(bs);
			--screen_cur_col;
		    }
		}
		else if (plan == PLAN_CR)
		{
		    if (noinvcurs)
			screen_stop_highlight();
		    out_char('\r');
		    screen_cur_col = 0;
		}
		else if (plan == PLAN_NL)
		{
		    if (noinvcurs)
			screen_stop_highlight();
		    while (screen_cur_row < row)
		    {
			out_char('\n');
			++screen_cur_row;
		    }
		    screen_cur_col = 0;
		}

		i = col - screen_cur_col;
		if (i > 0)
		{
		    /*
		     * Use cursor-right if it's one character only.  Avoids
		     * removing a line of pixels from the last bold char, when
		     * using the bold trick in the GUI.
		     */
		    if (T_ND[0] != NUL && T_ND[1] == NUL)
		    {
			while (i-- > 0)
			    out_char(*T_ND);
		    }
		    else
		    {
			int	off;

			off = LineOffset[row] + screen_cur_col;
			while (i-- > 0)
			{
			    if (ScreenAttrs[off] != screen_attr)
				screen_stop_highlight();
			    out_flush_check();
			    out_char(ScreenLines[off]);
			    if (enc_dbcs == DBCS_JPNU
						  && ScreenLines[off] == 0x8e)
				out_char(ScreenLines2[off]);
			    ++off;
			}
		    }
		}
	    }
	}
	else
	    cost = 999;

	if (cost >= goto_cost)
	{
	    if (noinvcurs)
		screen_stop_highlight();
	    if (row == screen_cur_row && (col > screen_cur_col)
							     && *T_CRI != NUL)
		term_cursor_right(col - screen_cur_col);
	    else
		term_windgoto(row, col);
	}
	screen_cur_row = row;
	screen_cur_col = col;
    }
}

/*
 * Set cursor to its position in the current window.
 */
    void
setcursor(void)
{
    setcursor_mayforce(FALSE);
}

/*
 * Set cursor to its position in the current window.
 * When "force" is TRUE also when not redrawing.
 */
    void
setcursor_mayforce(int force)
{
    if (force || redrawing())
    {
	validate_cursor();
	windgoto(W_WINROW(curwin) + curwin->w_wrow,
		curwin->w_wincol + (
#ifdef FEAT_RIGHTLEFT
		// With 'rightleft' set and the cursor on a double-wide
		// character, position it on the leftmost column.
		curwin->w_p_rl ? ((int)curwin->w_width - curwin->w_wcol
		    - ((has_mbyte
			   && (*mb_ptr2cells)(ml_get_cursor()) == 2
			   && vim_isprintc(gchar_cursor())) ? 2 : 1)) :
#endif
							    curwin->w_wcol));
    }
}


/*
 * Insert 'line_count' lines at 'row' in window 'wp'.
 * If 'invalid' is TRUE the wp->w_lines[].wl_lnum is invalidated.
 * If 'mayclear' is TRUE the screen will be cleared if it is faster than
 * scrolling.
 * Returns FAIL if the lines are not inserted, OK for success.
 */
    int
win_ins_lines(
    win_T	*wp,
    int		row,
    int		line_count,
    int		invalid,
    int		mayclear)
{
    int		did_delete;
    int		nextrow;
    int		lastrow;
    int		retval;

    if (invalid)
	wp->w_lines_valid = 0;

    if (wp->w_height < 5)
	return FAIL;

    if (line_count > wp->w_height - row)
	line_count = wp->w_height - row;

    retval = win_do_lines(wp, row, line_count, mayclear, FALSE, 0);
    if (retval != MAYBE)
	return retval;

    /*
     * If there is a next window or a status line, we first try to delete the
     * lines at the bottom to avoid messing what is after the window.
     * If this fails and there are following windows, don't do anything to
     * avoid messing up those windows, better just redraw.
     */
    did_delete = FALSE;
    if (wp->w_next != NULL || wp->w_status_height)
    {
	if (screen_del_lines(0, W_WINROW(wp) + wp->w_height - line_count,
				  line_count, (int)Rows, FALSE, 0, NULL) == OK)
	    did_delete = TRUE;
	else if (wp->w_next)
	    return FAIL;
    }
    /*
     * if no lines deleted, blank the lines that will end up below the window
     */
    if (!did_delete)
    {
	wp->w_redr_status = TRUE;
	redraw_cmdline = TRUE;
	nextrow = W_WINROW(wp) + wp->w_height + wp->w_status_height;
	lastrow = nextrow + line_count;
	if (lastrow > Rows)
	    lastrow = Rows;
	screen_fill(nextrow - line_count, lastrow - line_count,
		  wp->w_wincol, (int)W_ENDCOL(wp),
		  ' ', ' ', 0);
    }

    if (screen_ins_lines(0, W_WINROW(wp) + row, line_count, (int)Rows, 0, NULL)
								      == FAIL)
    {
	// deletion will have messed up other windows
	if (did_delete)
	{
	    wp->w_redr_status = TRUE;
	    win_rest_invalid(W_NEXT(wp));
	}
	return FAIL;
    }

    return OK;
}

/*
 * Delete "line_count" window lines at "row" in window "wp".
 * If "invalid" is TRUE curwin->w_lines[] is invalidated.
 * If "mayclear" is TRUE the screen will be cleared if it is faster than
 * scrolling
 * Return OK for success, FAIL if the lines are not deleted.
 */
    int
win_del_lines(
    win_T	*wp,
    int		row,
    int		line_count,
    int		invalid,
    int		mayclear,
    int		clear_attr)	    // for clearing lines
{
    int		retval;

    if (invalid)
	wp->w_lines_valid = 0;

    if (line_count > wp->w_height - row)
	line_count = wp->w_height - row;

    retval = win_do_lines(wp, row, line_count, mayclear, TRUE, clear_attr);
    if (retval != MAYBE)
	return retval;

    if (screen_del_lines(0, W_WINROW(wp) + row, line_count,
				   (int)Rows, FALSE, clear_attr, NULL) == FAIL)
	return FAIL;

    /*
     * If there are windows or status lines below, try to put them at the
     * correct place. If we can't do that, they have to be redrawn.
     */
    if (wp->w_next || wp->w_status_height || cmdline_row < Rows - 1)
    {
	if (screen_ins_lines(0, W_WINROW(wp) + wp->w_height - line_count,
			      line_count, (int)Rows, clear_attr, NULL) == FAIL)
	{
	    wp->w_redr_status = TRUE;
	    win_rest_invalid(wp->w_next);
	}
    }
    /*
     * If this is the last window and there is no status line, redraw the
     * command line later.
     */
    else
	redraw_cmdline = TRUE;
    return OK;
}

/*
 * Common code for win_ins_lines() and win_del_lines().
 * Returns OK or FAIL when the work has been done.
 * Returns MAYBE when not finished yet.
 */
    static int
win_do_lines(
    win_T	*wp,
    int		row,
    int		line_count,
    int		mayclear,
    int		del,
    int		clear_attr)
{
    int		retval;

    if (!redrawing() || line_count <= 0)
	return FAIL;

    // When inserting lines would result in loss of command output, just redraw
    // the lines.
    if (no_win_do_lines_ins && !del)
	return FAIL;

    // only a few lines left: redraw is faster
    if (mayclear && Rows - line_count < 5 && wp->w_width == Columns)
    {
	if (!no_win_do_lines_ins)
	    screenclear();	    // will set wp->w_lines_valid to 0
	return FAIL;
    }

#ifdef FEAT_PROP_POPUP
    // this doesn't work when there are popups visible
    if (popup_visible)
	return FAIL;
#endif

    // Delete all remaining lines
    if (row + line_count >= wp->w_height)
    {
	screen_fill(W_WINROW(wp) + row, W_WINROW(wp) + wp->w_height,
		wp->w_wincol, (int)W_ENDCOL(wp),
		' ', ' ', 0);
	return OK;
    }

    /*
     * When scrolling, the message on the command line should be cleared,
     * otherwise it will stay there forever.
     * Don't do this when avoiding to insert lines.
     */
    if (!no_win_do_lines_ins)
	clear_cmdline = TRUE;

    /*
     * If the terminal can set a scroll region, use that.
     * Always do this in a vertically split window.  This will redraw from
     * ScreenLines[] when t_CV isn't defined.  That's faster than using
     * win_line().
     * Don't use a scroll region when we are going to redraw the text, writing
     * a character in the lower right corner of the scroll region may cause a
     * scroll-up .
     */
    if (scroll_region || wp->w_width != Columns)
    {
	if (scroll_region && (wp->w_width == Columns || *T_CSV != NUL))
	    scroll_region_set(wp, row);
	if (del)
	    retval = screen_del_lines(W_WINROW(wp) + row, 0, line_count,
				    wp->w_height - row, FALSE, clear_attr, wp);
	else
	    retval = screen_ins_lines(W_WINROW(wp) + row, 0, line_count,
					   wp->w_height - row, clear_attr, wp);
	if (scroll_region && (wp->w_width == Columns || *T_CSV != NUL))
	    scroll_region_reset();
	return retval;
    }

    if (wp->w_next != NULL && p_tf) // don't delete/insert on fast terminal
	return FAIL;

    return MAYBE;
}

/*
 * window 'wp' and everything after it is messed up, mark it for redraw
 */
    static void
win_rest_invalid(win_T *wp)
{
    while (wp != NULL)
    {
	redraw_win_later(wp, NOT_VALID);
	wp->w_redr_status = TRUE;
	wp = wp->w_next;
    }
    redraw_cmdline = TRUE;
}

/*
 * The rest of the routines in this file perform screen manipulations. The
 * given operation is performed physically on the screen. The corresponding
 * change is also made to the internal screen image. In this way, the editor
 * anticipates the effect of editing changes on the appearance of the screen.
 * That way, when we call screenupdate a complete redraw isn't usually
 * necessary. Another advantage is that we can keep adding code to anticipate
 * screen changes, and in the meantime, everything still works.
 */

/*
 * types for inserting or deleting lines
 */
#define USE_T_CAL   1
#define USE_T_CDL   2
#define USE_T_AL    3
#define USE_T_CE    4
#define USE_T_DL    5
#define USE_T_SR    6
#define USE_NL	    7
#define USE_T_CD    8
#define USE_REDRAW  9

/*
 * insert lines on the screen and update ScreenLines[]
 * 'end' is the line after the scrolled part. Normally it is Rows.
 * When scrolling region used 'off' is the offset from the top for the region.
 * 'row' and 'end' are relative to the start of the region.
 *
 * return FAIL for failure, OK for success.
 */
    int
screen_ins_lines(
    int		off,
    int		row,
    int		line_count,
    int		end,
    int		clear_attr,
    win_T	*wp)	    // NULL or window to use width from
{
    int		i;
    int		j;
    unsigned	temp;
    int		cursor_row;
    int		cursor_col = 0;
    int		type;
    int		result_empty;
    int		can_ce = can_clear(T_CE);

    /*
     * FAIL if
     * - there is no valid screen
     * - the screen has to be redrawn completely
     * - the line count is less than one
     * - the line count is more than 'ttyscroll'
     * - redrawing for a callback and there is a modeless selection
     * - there is a popup window
     */
     if (!screen_valid(TRUE)
	     || line_count <= 0 || line_count > p_ttyscroll
#ifdef FEAT_CLIPBOARD
	     || (clip_star.state != SELECT_CLEARED
						 && redrawing_for_callback > 0)
#endif
#ifdef FEAT_PROP_POPUP
	     || popup_visible
#endif
	     )
	return FAIL;

    /*
     * There are seven ways to insert lines:
     * 0. When in a vertically split window and t_CV isn't set, redraw the
     *    characters from ScreenLines[].
     * 1. Use T_CD (clear to end of display) if it exists and the result of
     *	  the insert is just empty lines
     * 2. Use T_CAL (insert multiple lines) if it exists and T_AL is not
     *	  present or line_count > 1. It looks better if we do all the inserts
     *	  at once.
     * 3. Use T_CDL (delete multiple lines) if it exists and the result of the
     *	  insert is just empty lines and T_CE is not present or line_count >
     *	  1.
     * 4. Use T_AL (insert line) if it exists.
     * 5. Use T_CE (erase line) if it exists and the result of the insert is
     *	  just empty lines.
     * 6. Use T_DL (delete line) if it exists and the result of the insert is
     *	  just empty lines.
     * 7. Use T_SR (scroll reverse) if it exists and inserting at row 0 and
     *	  the 'da' flag is not set or we have clear line capability.
     * 8. redraw the characters from ScreenLines[].
     *
     * Careful: In a hpterm scroll reverse doesn't work as expected, it moves
     * the scrollbar for the window. It does have insert line, use that if it
     * exists.
     */
    result_empty = (row + line_count >= end);
    if (wp != NULL && wp->w_width != Columns && *T_CSV == NUL)
	type = USE_REDRAW;
    else if (can_clear(T_CD) && result_empty)
	type = USE_T_CD;
    else if (*T_CAL != NUL && (line_count > 1 || *T_AL == NUL))
	type = USE_T_CAL;
    else if (*T_CDL != NUL && result_empty && (line_count > 1 || !can_ce))
	type = USE_T_CDL;
    else if (*T_AL != NUL)
	type = USE_T_AL;
    else if (can_ce && result_empty)
	type = USE_T_CE;
    else if (*T_DL != NUL && result_empty)
	type = USE_T_DL;
    else if (*T_SR != NUL && row == 0 && (*T_DA == NUL || can_ce))
	type = USE_T_SR;
    else
	return FAIL;

    /*
     * For clearing the lines screen_del_lines() is used. This will also take
     * care of t_db if necessary.
     */
    if (type == USE_T_CD || type == USE_T_CDL ||
					 type == USE_T_CE || type == USE_T_DL)
	return screen_del_lines(off, row, line_count, end, FALSE, 0, wp);

    /*
     * If text is retained below the screen, first clear or delete as many
     * lines at the bottom of the window as are about to be inserted so that
     * the deleted lines won't later surface during a screen_del_lines.
     */
    if (*T_DB)
	screen_del_lines(off, end - line_count, line_count, end, FALSE, 0, wp);

#ifdef FEAT_CLIPBOARD
    // Remove a modeless selection when inserting lines halfway the screen
    // or not the full width of the screen.
    if (off + row > 0 || (wp != NULL && wp->w_width != Columns))
	clip_clear_selection(&clip_star);
    else
	clip_scroll_selection(-line_count);
#endif

#ifdef FEAT_GUI_HAIKU
    vim_lock_screen();
#endif

#ifdef FEAT_GUI
    // Don't update the GUI cursor here, ScreenLines[] is invalid until the
    // scrolling is actually carried out.
    gui_dont_update_cursor(row + off <= gui.cursor_row);
#endif

    if (wp != NULL && wp->w_wincol != 0 && *T_CSV != NUL && *T_CCS == NUL)
	cursor_col = wp->w_wincol;

    if (*T_CCS != NUL)	   // cursor relative to region
	cursor_row = row;
    else
	cursor_row = row + off;

    /*
     * Shift LineOffset[] line_count down to reflect the inserted lines.
     * Clear the inserted lines in ScreenLines[].
     */
    row += off;
    end += off;
    for (i = 0; i < line_count; ++i)
    {
	if (wp != NULL && wp->w_width != Columns)
	{
	    // need to copy part of a line
	    j = end - 1 - i;
	    while ((j -= line_count) >= row)
		linecopy(j + line_count, j, wp);
	    j += line_count;
	    if (can_clear((char_u *)" "))
		lineclear(LineOffset[j] + wp->w_wincol, wp->w_width,
								   clear_attr);
	    else
		lineinvalid(LineOffset[j] + wp->w_wincol, wp->w_width);
	    LineWraps[j] = FALSE;
	}
	else
	{
	    j = end - 1 - i;
	    temp = LineOffset[j];
	    while ((j -= line_count) >= row)
	    {
		LineOffset[j + line_count] = LineOffset[j];
		LineWraps[j + line_count] = LineWraps[j];
	    }
	    LineOffset[j + line_count] = temp;
	    LineWraps[j + line_count] = FALSE;
	    if (can_clear((char_u *)" "))
		lineclear(temp, (int)Columns, clear_attr);
	    else
		lineinvalid(temp, (int)Columns);
	}
    }

#ifdef FEAT_GUI_HAIKU
    vim_unlock_screen();
#endif

    screen_stop_highlight();
    windgoto(cursor_row, cursor_col);
    if (clear_attr != 0)
	screen_start_highlight(clear_attr);

    // redraw the characters
    if (type == USE_REDRAW)
	redraw_block(row, end, wp);
    else if (type == USE_T_CAL)
    {
	term_append_lines(line_count);
	screen_start();		// don't know where cursor is now
    }
    else
    {
	for (i = 0; i < line_count; i++)
	{
	    if (type == USE_T_AL)
	    {
		if (i && cursor_row != 0)
		    windgoto(cursor_row, cursor_col);
		out_str(T_AL);
	    }
	    else  // type == USE_T_SR
		out_str(T_SR);
	    screen_start();	    // don't know where cursor is now
	}
    }

    /*
     * With scroll-reverse and 'da' flag set we need to clear the lines that
     * have been scrolled down into the region.
     */
    if (type == USE_T_SR && *T_DA)
    {
	for (i = 0; i < line_count; ++i)
	{
	    windgoto(off + i, cursor_col);
	    out_str(T_CE);
	    screen_start();	    // don't know where cursor is now
	}
    }

#ifdef FEAT_GUI
    gui_can_update_cursor();
    if (gui.in_use)
	out_flush();	// always flush after a scroll
#endif
    return OK;
}

/*
 * Delete lines on the screen and update ScreenLines[].
 * "end" is the line after the scrolled part. Normally it is Rows.
 * When scrolling region used "off" is the offset from the top for the region.
 * "row" and "end" are relative to the start of the region.
 *
 * Return OK for success, FAIL if the lines are not deleted.
 */
    int
screen_del_lines(
    int		off,
    int		row,
    int		line_count,
    int		end,
    int		force,		// even when line_count > p_ttyscroll
    int		clear_attr,	// used for clearing lines
    win_T	*wp UNUSED)	// NULL or window to use width from
{
    int		j;
    int		i;
    unsigned	temp;
    int		cursor_row;
    int		cursor_col = 0;
    int		cursor_end;
    int		result_empty;	// result is empty until end of region
    int		can_delete;	// deleting line codes can be used
    int		type;

    /*
     * FAIL if
     * - there is no valid screen
     * - the screen has to be redrawn completely
     * - the line count is less than one
     * - the line count is more than 'ttyscroll'
     * - redrawing for a callback and there is a modeless selection
     */
    if (!screen_valid(TRUE) || line_count <= 0
					|| (!force && line_count > p_ttyscroll)
#ifdef FEAT_CLIPBOARD
	     || (clip_star.state != SELECT_CLEARED
						 && redrawing_for_callback > 0)
#endif
       )
	return FAIL;

    /*
     * Check if the rest of the current region will become empty.
     */
    result_empty = row + line_count >= end;

    /*
     * We can delete lines only when 'db' flag not set or when 'ce' option
     * available.
     */
    can_delete = (*T_DB == NUL || can_clear(T_CE));

    /*
     * There are six ways to delete lines:
     * 0. When in a vertically split window and t_CV isn't set, redraw the
     *    characters from ScreenLines[].
     * 1. Use T_CD if it exists and the result is empty.
     * 2. Use newlines if row == 0 and count == 1 or T_CDL does not exist.
     * 3. Use T_CDL (delete multiple lines) if it exists and line_count > 1 or
     *	  none of the other ways work.
     * 4. Use T_CE (erase line) if the result is empty.
     * 5. Use T_DL (delete line) if it exists.
     * 6. redraw the characters from ScreenLines[].
     */
    if (wp != NULL && wp->w_width != Columns && *T_CSV == NUL)
	type = USE_REDRAW;
    else if (can_clear(T_CD) && result_empty)
	type = USE_T_CD;
    else if (row == 0 && (
#ifndef AMIGA
	// On the Amiga, somehow '\n' on the last line doesn't always scroll
	// up, so use delete-line command
			    line_count == 1 ||
#endif
						*T_CDL == NUL))
	type = USE_NL;
    else if (*T_CDL != NUL && line_count > 1 && can_delete)
	type = USE_T_CDL;
    else if (can_clear(T_CE) && result_empty
	    && (wp == NULL || wp->w_width == Columns))
	type = USE_T_CE;
    else if (*T_DL != NUL && can_delete)
	type = USE_T_DL;
    else if (*T_CDL != NUL && can_delete)
	type = USE_T_CDL;
    else
	return FAIL;

#ifdef FEAT_CLIPBOARD
    // Remove a modeless selection when deleting lines halfway the screen or
    // not the full width of the screen.
    if (off + row > 0 || (wp != NULL && wp->w_width != Columns))
	clip_clear_selection(&clip_star);
    else
	clip_scroll_selection(line_count);
#endif

#ifdef FEAT_GUI_HAIKU
    vim_lock_screen();
#endif

#ifdef FEAT_GUI
    // Don't update the GUI cursor here, ScreenLines[] is invalid until the
    // scrolling is actually carried out.
    gui_dont_update_cursor(gui.cursor_row >= row + off
						&& gui.cursor_row < end + off);
#endif

    if (wp != NULL && wp->w_wincol != 0 && *T_CSV != NUL && *T_CCS == NUL)
	cursor_col = wp->w_wincol;

    if (*T_CCS != NUL)	    // cursor relative to region
    {
	cursor_row = row;
	cursor_end = end;
    }
    else
    {
	cursor_row = row + off;
	cursor_end = end + off;
    }

    /*
     * Now shift LineOffset[] line_count up to reflect the deleted lines.
     * Clear the inserted lines in ScreenLines[].
     */
    row += off;
    end += off;
    for (i = 0; i < line_count; ++i)
    {
	if (wp != NULL && wp->w_width != Columns)
	{
	    // need to copy part of a line
	    j = row + i;
	    while ((j += line_count) <= end - 1)
		linecopy(j - line_count, j, wp);
	    j -= line_count;
	    if (can_clear((char_u *)" "))
		lineclear(LineOffset[j] + wp->w_wincol, wp->w_width,
								   clear_attr);
	    else
		lineinvalid(LineOffset[j] + wp->w_wincol, wp->w_width);
	    LineWraps[j] = FALSE;
	}
	else
	{
	    // whole width, moving the line pointers is faster
	    j = row + i;
	    temp = LineOffset[j];
	    while ((j += line_count) <= end - 1)
	    {
		LineOffset[j - line_count] = LineOffset[j];
		LineWraps[j - line_count] = LineWraps[j];
	    }
	    LineOffset[j - line_count] = temp;
	    LineWraps[j - line_count] = FALSE;
	    if (can_clear((char_u *)" "))
		lineclear(temp, (int)Columns, clear_attr);
	    else
		lineinvalid(temp, (int)Columns);
	}
    }

#ifdef FEAT_GUI_HAIKU
    vim_unlock_screen();
#endif

    if (screen_attr != clear_attr)
	screen_stop_highlight();
    if (clear_attr != 0)
	screen_start_highlight(clear_attr);

    // redraw the characters
    if (type == USE_REDRAW)
	redraw_block(row, end, wp);
    else if (type == USE_T_CD)	// delete the lines
    {
	windgoto(cursor_row, cursor_col);
	out_str(T_CD);
	screen_start();			// don't know where cursor is now
    }
    else if (type == USE_T_CDL)
    {
	windgoto(cursor_row, cursor_col);
	term_delete_lines(line_count);
	screen_start();			// don't know where cursor is now
    }
    /*
     * Deleting lines at top of the screen or scroll region: Just scroll
     * the whole screen (scroll region) up by outputting newlines on the
     * last line.
     */
    else if (type == USE_NL)
    {
	windgoto(cursor_end - 1, cursor_col);
	for (i = line_count; --i >= 0; )
	    out_char('\n');		// cursor will remain on same line
    }
    else
    {
	for (i = line_count; --i >= 0; )
	{
	    if (type == USE_T_DL)
	    {
		windgoto(cursor_row, cursor_col);
		out_str(T_DL);		// delete a line
	    }
	    else // type == USE_T_CE
	    {
		windgoto(cursor_row + i, cursor_col);
		out_str(T_CE);		// erase a line
	    }
	    screen_start();		// don't know where cursor is now
	}
    }

    /*
     * If the 'db' flag is set, we need to clear the lines that have been
     * scrolled up at the bottom of the region.
     */
    if (*T_DB && (type == USE_T_DL || type == USE_T_CDL))
    {
	for (i = line_count; i > 0; --i)
	{
	    windgoto(cursor_end - i, cursor_col);
	    out_str(T_CE);		// erase a line
	    screen_start();		// don't know where cursor is now
	}
    }

#ifdef FEAT_GUI
    gui_can_update_cursor();
    if (gui.in_use)
	out_flush();	// always flush after a scroll
#endif

    return OK;
}

/*
 * Return TRUE when postponing displaying the mode message: when not redrawing
 * or inside a mapping.
 */
    int
skip_showmode()
{
    // Call char_avail() only when we are going to show something, because it
    // takes a bit of time.  redrawing() may also call char_avail_avail().
    if (global_busy
	    || msg_silent != 0
	    || !redrawing()
	    || (char_avail() && !KeyTyped))
    {
	redraw_mode = TRUE;		// show mode later
	return TRUE;
    }
    return FALSE;
}

/*
 * Show the current mode and ruler.
 *
 * If clear_cmdline is TRUE, clear the rest of the cmdline.
 * If clear_cmdline is FALSE there may be a message there that needs to be
 * cleared only if a mode is shown.
 * If redraw_mode is TRUE show or clear the mode.
 * Return the length of the message (0 if no message).
 */
    int
showmode(void)
{
    int		need_clear;
    int		length = 0;
    int		do_mode;
    int		attr;
    int		nwr_save;
    int		sub_attr;

    do_mode = ((p_smd && msg_silent == 0)
	    && ((State & INSERT)
		|| restart_edit != NUL
		|| VIsual_active));
    if (do_mode || reg_recording != 0)
    {
	if (skip_showmode())
	    return 0;		// show mode later

	nwr_save = need_wait_return;

	// wait a bit before overwriting an important message
	check_for_delay(FALSE);

	// if the cmdline is more than one line high, erase top lines
	need_clear = clear_cmdline;
	if (clear_cmdline && cmdline_row < Rows - 1)
	    msg_clr_cmdline();			// will reset clear_cmdline

	// Position on the last line in the window, column 0
	msg_pos_mode();
	cursor_off();
	attr = HL_ATTR(HLF_CM);			// Highlight mode
	if (do_mode)
	{
	    msg_puts_attr("--", attr);
#if defined(FEAT_XIM)
	    if (
# ifdef FEAT_GUI_GTK
		    preedit_get_status()
# else
		    im_get_status()
# endif
	       )
# ifdef FEAT_GUI_GTK // most of the time, it's not XIM being used
		msg_puts_attr(" IM", attr);
# else
		msg_puts_attr(" XIM", attr);
# endif
#endif
	    // CTRL-X in Insert mode
	    if (edit_submode != NULL && !shortmess(SHM_COMPLETIONMENU))
	    {
		// These messages can get long, avoid a wrap in a narrow
		// window.  Prefer showing edit_submode_extra.
		length = (Rows - msg_row) * Columns - 3;
		if (edit_submode_extra != NULL)
		    length -= vim_strsize(edit_submode_extra);
		if (length > 0)
		{
		    if (edit_submode_pre != NULL)
			length -= vim_strsize(edit_submode_pre);
		    if (length - vim_strsize(edit_submode) > 0)
		    {
			if (edit_submode_pre != NULL)
			    msg_puts_attr((char *)edit_submode_pre, attr);
			msg_puts_attr((char *)edit_submode, attr);
		    }
		    if (edit_submode_extra != NULL)
		    {
			msg_puts_attr(" ", attr);  // add a space in between
			if ((int)edit_submode_highl < (int)HLF_COUNT)
			    sub_attr = HL_ATTR(edit_submode_highl);
			else
			    sub_attr = attr;
			msg_puts_attr((char *)edit_submode_extra, sub_attr);
		    }
		}
	    }
	    else
	    {
		if (State & VREPLACE_FLAG)
		    msg_puts_attr(_(" VREPLACE"), attr);
		else if (State & REPLACE_FLAG)
		    msg_puts_attr(_(" REPLACE"), attr);
		else if (State & INSERT)
		{
#ifdef FEAT_RIGHTLEFT
		    if (p_ri)
			msg_puts_attr(_(" REVERSE"), attr);
#endif
		    msg_puts_attr(_(" INSERT"), attr);
		}
		else if (restart_edit == 'I' || restart_edit == 'i' ||
			restart_edit == 'a' || restart_edit == 'A')
		    msg_puts_attr(_(" (insert)"), attr);
		else if (restart_edit == 'R')
		    msg_puts_attr(_(" (replace)"), attr);
		else if (restart_edit == 'V')
		    msg_puts_attr(_(" (vreplace)"), attr);
#ifdef FEAT_RIGHTLEFT
		if (p_hkmap)
		    msg_puts_attr(_(" Hebrew"), attr);
#endif
#ifdef FEAT_KEYMAP
		if (State & LANGMAP)
		{
# ifdef FEAT_ARABIC
		    if (curwin->w_p_arab)
			msg_puts_attr(_(" Arabic"), attr);
		    else
# endif
			if (get_keymap_str(curwin, (char_u *)" (%s)",
							   NameBuff, MAXPATHL))
			    msg_puts_attr((char *)NameBuff, attr);
		}
#endif
		if ((State & INSERT) && p_paste)
		    msg_puts_attr(_(" (paste)"), attr);

		if (VIsual_active)
		{
		    char *p;

		    // Don't concatenate separate words to avoid translation
		    // problems.
		    switch ((VIsual_select ? 4 : 0)
			    + (VIsual_mode == Ctrl_V) * 2
			    + (VIsual_mode == 'V'))
		    {
			case 0:	p = N_(" VISUAL"); break;
			case 1: p = N_(" VISUAL LINE"); break;
			case 2: p = N_(" VISUAL BLOCK"); break;
			case 4: p = N_(" SELECT"); break;
			case 5: p = N_(" SELECT LINE"); break;
			default: p = N_(" SELECT BLOCK"); break;
		    }
		    msg_puts_attr(_(p), attr);
		}
		msg_puts_attr(" --", attr);
	    }

	    need_clear = TRUE;
	}
	if (reg_recording != 0
		&& edit_submode == NULL)    // otherwise it gets too long
	{
	    recording_mode(attr);
	    need_clear = TRUE;
	}

	mode_displayed = TRUE;
	if (need_clear || clear_cmdline || redraw_mode)
	    msg_clr_eos();
	msg_didout = FALSE;		// overwrite this message
	length = msg_col;
	msg_col = 0;
	need_wait_return = nwr_save;	// never ask for hit-return for this
    }
    else if (clear_cmdline && msg_silent == 0)
	// Clear the whole command line.  Will reset "clear_cmdline".
	msg_clr_cmdline();
    else if (redraw_mode)
    {
	msg_pos_mode();
	msg_clr_eos();
    }

#ifdef FEAT_CMDL_INFO
    // In Visual mode the size of the selected area must be redrawn.
    if (VIsual_active)
	clear_showcmd();

    // If the last window has no status line, the ruler is after the mode
    // message and must be redrawn
    if (redrawing() && lastwin->w_status_height == 0)
	win_redr_ruler(lastwin, TRUE, FALSE);
#endif
    redraw_cmdline = FALSE;
    redraw_mode = FALSE;
    clear_cmdline = FALSE;

    return length;
}

/*
 * Position for a mode message.
 */
    static void
msg_pos_mode(void)
{
    msg_col = 0;
    msg_row = Rows - 1;
}

/*
 * Delete mode message.  Used when ESC is typed which is expected to end
 * Insert mode (but Insert mode didn't end yet!).
 * Caller should check "mode_displayed".
 */
    void
unshowmode(int force)
{
    /*
     * Don't delete it right now, when not redrawing or inside a mapping.
     */
    if (!redrawing() || (!force && char_avail() && !KeyTyped))
	redraw_cmdline = TRUE;		// delete mode later
    else
	clearmode();
}

/*
 * Clear the mode message.
 */
    void
clearmode(void)
{
    int save_msg_row = msg_row;
    int save_msg_col = msg_col;

    msg_pos_mode();
    if (reg_recording != 0)
	recording_mode(HL_ATTR(HLF_CM));
    msg_clr_eos();

    msg_col = save_msg_col;
    msg_row = save_msg_row;
}

    static void
recording_mode(int attr)
{
    msg_puts_attr(_("recording"), attr);
    if (!shortmess(SHM_RECORDING))
    {
	char s[4];

	sprintf(s, " @%c", reg_recording);
	msg_puts_attr(s, attr);
    }
}

/*
 * Draw the tab pages line at the top of the Vim window.
 */
    void
draw_tabline(void)
{
    int		tabcount = 0;
    tabpage_T	*tp;
    int		tabwidth;
    int		col = 0;
    int		scol = 0;
    int		attr;
    win_T	*wp;
    win_T	*cwp;
    int		wincount;
    int		modified;
    int		c;
    int		len;
    int		attr_sel = HL_ATTR(HLF_TPS);
    int		attr_nosel = HL_ATTR(HLF_TP);
    int		attr_fill = HL_ATTR(HLF_TPF);
    char_u	*p;
    int		room;
    int		use_sep_chars = (t_colors < 8
#ifdef FEAT_GUI
					    && !gui.in_use
#endif
#ifdef FEAT_TERMGUICOLORS
					    && !p_tgc
#endif
					    );

    if (ScreenLines == NULL)
	return;
    redraw_tabline = FALSE;

#ifdef FEAT_GUI_TABLINE
    // Take care of a GUI tabline.
    if (gui_use_tabline())
    {
	gui_update_tabline();
	return;
    }
#endif

    if (tabline_height() < 1)
	return;

#if defined(FEAT_STL_OPT)
    clear_TabPageIdxs();

    // Use the 'tabline' option if it's set.
    if (*p_tal != NUL)
    {
	int	saved_did_emsg = did_emsg;

	// Check for an error.  If there is one we would loop in redrawing the
	// screen.  Avoid that by making 'tabline' empty.
	did_emsg = FALSE;
	win_redr_custom(NULL, FALSE);
	if (did_emsg)
	    set_string_option_direct((char_u *)"tabline", -1,
					   (char_u *)"", OPT_FREE, SID_ERROR);
	did_emsg |= saved_did_emsg;
    }
    else
#endif
    {
	FOR_ALL_TABPAGES(tp)
	    ++tabcount;

	tabwidth = (Columns - 1 + tabcount / 2) / tabcount;
	if (tabwidth < 6)
	    tabwidth = 6;

	attr = attr_nosel;
	tabcount = 0;
	for (tp = first_tabpage; tp != NULL && col < Columns - 4;
							     tp = tp->tp_next)
	{
	    scol = col;

	    if (tp->tp_topframe == topframe)
		attr = attr_sel;
	    if (use_sep_chars && col > 0)
		screen_putchar('|', 0, col++, attr);

	    if (tp->tp_topframe != topframe)
		attr = attr_nosel;

	    screen_putchar(' ', 0, col++, attr);

	    if (tp == curtab)
	    {
		cwp = curwin;
		wp = firstwin;
	    }
	    else
	    {
		cwp = tp->tp_curwin;
		wp = tp->tp_firstwin;
	    }

	    modified = FALSE;
	    for (wincount = 0; wp != NULL; wp = wp->w_next, ++wincount)
		if (bufIsChanged(wp->w_buffer))
		    modified = TRUE;
	    if (modified || wincount > 1)
	    {
		if (wincount > 1)
		{
		    vim_snprintf((char *)NameBuff, MAXPATHL, "%d", wincount);
		    len = (int)STRLEN(NameBuff);
		    if (col + len >= Columns - 3)
			break;
		    screen_puts_len(NameBuff, len, 0, col,
#if defined(FEAT_SYN_HL)
					 hl_combine_attr(attr, HL_ATTR(HLF_T))
#else
					 attr
#endif
					       );
		    col += len;
		}
		if (modified)
		    screen_puts_len((char_u *)"+", 1, 0, col++, attr);
		screen_putchar(' ', 0, col++, attr);
	    }

	    room = scol - col + tabwidth - 1;
	    if (room > 0)
	    {
		// Get buffer name in NameBuff[]
		get_trans_bufname(cwp->w_buffer);
		shorten_dir(NameBuff);
		len = vim_strsize(NameBuff);
		p = NameBuff;
		if (has_mbyte)
		    while (len > room)
		    {
			len -= ptr2cells(p);
			MB_PTR_ADV(p);
		    }
		else if (len > room)
		{
		    p += len - room;
		    len = room;
		}
		if (len > Columns - col - 1)
		    len = Columns - col - 1;

		screen_puts_len(p, (int)STRLEN(p), 0, col, attr);
		col += len;
	    }
	    screen_putchar(' ', 0, col++, attr);

	    // Store the tab page number in TabPageIdxs[], so that
	    // jump_to_mouse() knows where each one is.
	    ++tabcount;
	    while (scol < col)
		TabPageIdxs[scol++] = tabcount;
	}

	if (use_sep_chars)
	    c = '_';
	else
	    c = ' ';
	screen_fill(0, 1, col, (int)Columns, c, c, attr_fill);

	// Put an "X" for closing the current tab if there are several.
	if (first_tabpage->tp_next != NULL)
	{
	    screen_putchar('X', 0, (int)Columns - 1, attr_nosel);
	    TabPageIdxs[Columns - 1] = -999;
	}
    }

    // Reset the flag here again, in case evaluating 'tabline' causes it to be
    // set.
    redraw_tabline = FALSE;
}

/*
 * Get buffer name for "buf" into NameBuff[].
 * Takes care of special buffer names and translates special characters.
 */
    void
get_trans_bufname(buf_T *buf)
{
    if (buf_spname(buf) != NULL)
	vim_strncpy(NameBuff, buf_spname(buf), MAXPATHL - 1);
    else
	home_replace(buf, buf->b_fname, NameBuff, MAXPATHL, TRUE);
    trans_characters(NameBuff, MAXPATHL);
}

/*
 * Get the character to use in a status line.  Get its attributes in "*attr".
 */
    int
fillchar_status(int *attr, win_T *wp)
{
    int fill;

#ifdef FEAT_TERMINAL
    if (bt_terminal(wp->w_buffer))
    {
	if (wp == curwin)
	{
	    *attr = HL_ATTR(HLF_ST);
	    fill = fill_stl;
	}
	else
	{
	    *attr = HL_ATTR(HLF_STNC);
	    fill = fill_stlnc;
	}
    }
    else
#endif
    if (wp == curwin)
    {
	*attr = HL_ATTR(HLF_S);
	fill = fill_stl;
    }
    else
    {
	*attr = HL_ATTR(HLF_SNC);
	fill = fill_stlnc;
    }
    // Use fill when there is highlighting, and highlighting of current
    // window differs, or the fillchars differ, or this is not the
    // current window
    if (*attr != 0 && ((HL_ATTR(HLF_S) != HL_ATTR(HLF_SNC)
			|| wp != curwin || ONE_WINDOW)
		    || (fill_stl != fill_stlnc)))
	return fill;
    if (wp == curwin)
	return '^';
    return '=';
}

/*
 * Get the character to use in a separator between vertically split windows.
 * Get its attributes in "*attr".
 */
    int
fillchar_vsep(int *attr)
{
    *attr = HL_ATTR(HLF_C);
    if (*attr == 0 && fill_vert == ' ')
	return '|';
    else
	return fill_vert;
}

/*
 * Return TRUE if redrawing should currently be done.
 */
    int
redrawing(void)
{
#ifdef FEAT_EVAL
    if (disable_redraw_for_testing)
	return 0;
    else
#endif
	return ((!RedrawingDisabled
#ifdef FEAT_EVAL
		    || ignore_redraw_flag_for_testing
#endif
		) && !(p_lz && char_avail() && !KeyTyped && !do_redraw));
}

/*
 * Return TRUE if printing messages should currently be done.
 */
    int
messaging(void)
{
    return (!(p_lz && char_avail() && !KeyTyped));
}

/*
 * Compute columns for ruler and shown command. 'sc_col' is also used to
 * decide what the maximum length of a message on the status line can be.
 * If there is a status line for the last window, 'sc_col' is independent
 * of 'ru_col'.
 */

#define COL_RULER 17	    // columns needed by standard ruler

    void
comp_col(void)
{
#if defined(FEAT_CMDL_INFO)
    int last_has_status = (p_ls == 2 || (p_ls == 1 && !ONE_WINDOW));

    sc_col = 0;
    ru_col = 0;
    if (p_ru)
    {
# ifdef FEAT_STL_OPT
	ru_col = (ru_wid ? ru_wid : COL_RULER) + 1;
# else
	ru_col = COL_RULER + 1;
# endif
	// no last status line, adjust sc_col
	if (!last_has_status)
	    sc_col = ru_col;
    }
    if (p_sc)
    {
	sc_col += SHOWCMD_COLS;
	if (!p_ru || last_has_status)	    // no need for separating space
	    ++sc_col;
    }
    sc_col = Columns - sc_col;
    ru_col = Columns - ru_col;
    if (sc_col <= 0)		// screen too narrow, will become a mess
	sc_col = 1;
    if (ru_col <= 0)
	ru_col = 1;
#else
    sc_col = Columns;
    ru_col = Columns;
#endif
#ifdef FEAT_EVAL
    set_vim_var_nr(VV_ECHOSPACE, sc_col - 1);
#endif
}

#if defined(FEAT_LINEBREAK) || defined(PROTO)
/*
 * Return the width of the 'number' and 'relativenumber' column.
 * Caller may need to check if 'number' or 'relativenumber' is set.
 * Otherwise it depends on 'numberwidth' and the line count.
 */
    int
number_width(win_T *wp)
{
    int		n;
    linenr_T	lnum;

    if (wp->w_p_rnu && !wp->w_p_nu)
	// cursor line shows "0"
	lnum = wp->w_height;
    else
	// cursor line shows absolute line number
	lnum = wp->w_buffer->b_ml.ml_line_count;

    if (lnum == wp->w_nrwidth_line_count && wp->w_nuw_cached == wp->w_p_nuw)
	return wp->w_nrwidth_width;
    wp->w_nrwidth_line_count = lnum;

    n = 0;
    do
    {
	lnum /= 10;
	++n;
    } while (lnum > 0);

    // 'numberwidth' gives the minimal width plus one
    if (n < wp->w_p_nuw - 1)
	n = wp->w_p_nuw - 1;

# ifdef FEAT_SIGNS
    // If 'signcolumn' is set to 'number' and there is a sign to display, then
    // the minimal width for the number column is 2.
    if (n < 2 && get_first_valid_sign(wp) != NULL
	    && (*wp->w_p_scl == 'n' && *(wp->w_p_scl + 1) == 'u'))
	n = 2;
# endif

    wp->w_nrwidth_width = n;
    wp->w_nuw_cached = wp->w_p_nuw;
    return n;
}
#endif

#if defined(FEAT_EVAL) || defined(PROTO)
/*
 * Return the current cursor column. This is the actual position on the
 * screen. First column is 0.
 */
    int
screen_screencol(void)
{
    return screen_cur_col;
}

/*
 * Return the current cursor row. This is the actual position on the screen.
 * First row is 0.
 */
    int
screen_screenrow(void)
{
    return screen_cur_row;
}
#endif

/*
 * Handle setting 'listchars' or 'fillchars'.
 * Assume monocell characters.
 * Returns error message, NULL if it's OK.
 */
    char *
set_chars_option(win_T *wp, char_u **varp)
{
    int		round, i, len, entries;
    char_u	*p, *s;
    int		c1 = 0, c2 = 0, c3 = 0;
    char_u	*last_multispace;	// Last occurrence of "multispace:"
    int		multispace_len = 0;	// Length of lcs-multispace string
    struct charstab
    {
	int	*cp;
	char	*name;
    };
    static struct charstab filltab[] =
    {
	{&fill_stl,		"stl"},
	{&fill_stlnc,		"stlnc"},
	{&fill_vert,		"vert"},
	{&fill_fold,		"fold"},
	{&fill_foldopen,	"foldopen"},
	{&fill_foldclosed,	"foldclose"},
	{&fill_foldsep,		"foldsep"},
	{&fill_diff,		"diff"},
	{&fill_eob,		"eob"},
    };
    static lcs_chars_T lcs_chars;
    struct charstab lcstab[] =
    {
	{&lcs_chars.eol,	"eol"},
	{&lcs_chars.ext,	"extends"},
	{&lcs_chars.nbsp,	"nbsp"},
	{&lcs_chars.prec,	"precedes"},
	{&lcs_chars.space,	"space"},
	{&lcs_chars.tab2,	"tab"},
	{&lcs_chars.trail,	"trail"},
	{&lcs_chars.lead,	"lead"},
#ifdef FEAT_CONCEAL
	{&lcs_chars.conceal,	"conceal"},
#else
	{NULL,			"conceal"},
#endif
    };
    struct charstab *tab;

    if (varp == &p_lcs || varp == &wp->w_p_lcs)
    {
	tab = lcstab;
	CLEAR_FIELD(lcs_chars);
	entries = ARRAY_LENGTH(lcstab);
	if (varp == &wp->w_p_lcs && wp->w_p_lcs[0] == NUL)
	    varp = &p_lcs;
    }
    else
    {
	tab = filltab;
	entries = ARRAY_LENGTH(filltab);
    }

    // first round: check for valid value, second round: assign values
    for (round = 0; round <= 1; ++round)
    {
	if (round > 0)
	{
	    // After checking that the value is valid: set defaults: space for
	    // 'fillchars', NUL for 'listchars'
	    for (i = 0; i < entries; ++i)
		if (tab[i].cp != NULL)
		    *(tab[i].cp) =
			((varp == &p_lcs || varp == &wp->w_p_lcs) ? NUL : ' ');

	    if (varp == &p_lcs || varp == &wp->w_p_lcs)
	    {
		lcs_chars.tab1 = NUL;
		lcs_chars.tab3 = NUL;
		if (multispace_len)
		{
		    lcs_chars.multispace = ALLOC_MULT(int, multispace_len + 1);
		    lcs_chars.multispace[multispace_len] = NUL;
		}
		else
		    lcs_chars.multispace = NULL;
	    }
	    else
	    {
		fill_diff = '-';
		fill_foldopen = '-';
		fill_foldclosed = '+';
		fill_foldsep = '|';
		fill_eob = '~';
	    }
	}
	p = *varp;
	while (*p)
	{
	    for (i = 0; i < entries; ++i)
	    {
		len = (int)STRLEN(tab[i].name);
		if (STRNCMP(p, tab[i].name, len) == 0
			&& p[len] == ':'
			&& p[len + 1] != NUL)
		{
		    c2 = c3 = 0;
		    s = p + len + 1;
		    c1 = mb_ptr2char_adv(&s);
		    if (mb_char2cells(c1) > 1)
			return e_invarg;
		    if (tab[i].cp == &lcs_chars.tab2)
		    {
			if (*s == NUL)
			    return e_invarg;
			c2 = mb_ptr2char_adv(&s);
			if (mb_char2cells(c2) > 1)
			    return e_invarg;
			if (!(*s == ',' || *s == NUL))
			{
			    c3 = mb_ptr2char_adv(&s);
			    if (mb_char2cells(c3) > 1)
				return e_invarg;
			}
		    }

		    if (*s == ',' || *s == NUL)
		    {
			if (round)
			{
			    if (tab[i].cp == &lcs_chars.tab2)
			    {
				lcs_chars.tab1 = c1;
				lcs_chars.tab2 = c2;
				lcs_chars.tab3 = c3;
			    }
			    else if (tab[i].cp != NULL)
				*(tab[i].cp) = c1;

			}
			p = s;
			break;
		    }
		}
	    }

	    if (i == entries)
	    {
		len = STRLEN("multispace");
		if ((varp == &p_lcs || varp == &wp->w_p_lcs)
			&& STRNCMP(p, "multispace", len) == 0
			&& p[len] == ':'
			&& p[len + 1] != NUL)
		{
		    s = p + len + 1;
		    if (round == 0)
		    {
			// Get length of lcs-multispace string in first round
			last_multispace = p;
			multispace_len = 0;
			while (*s != NUL && *s != ',')
			{
			    c1 = mb_ptr2char_adv(&s);
			    if (mb_char2cells(c1) > 1)
				return e_invarg;
			    ++multispace_len;
			}
			if (multispace_len == 0)
			    // lcs-multispace cannot be an empty string
			    return e_invarg;
			p = s;
		    }
		    else
		    {
			int multispace_pos = 0;
			while (*s != NUL && *s != ',')
			{
			    c1 = mb_ptr2char_adv(&s);
			    if (p == last_multispace)
				lcs_chars.multispace[multispace_pos++] = c1;
			}
			p = s;
		    }
		}
		else
		    return e_invarg;
	    }

	    if (*p == ',')
		++p;
	}
    }
    if (tab == lcstab)
    {
	if (wp->w_lcs_chars.multispace != NULL)
	    vim_free(wp->w_lcs_chars.multispace);
	wp->w_lcs_chars = lcs_chars;
    }

    return NULL;	// no error
}