summaryrefslogtreecommitdiff
path: root/src/os_msdos.c
blob: dee6d9128041bee3c8d125963a253aec0e1a793e (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
/* vi:set ts=8 sts=4 sw=4:
 *
 * 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.
 */

/*
 * os_msdos.c
 *
 * MSDOS system-dependent routines.
 * A cheap plastic imitation of the amiga dependent code.
 * A lot in this file was made by Juergen Weigert (jw).
 *
 * DJGPP changes by Gert van Antwerpen
 * Faster text screens by John Lange (jlange@zilker.net)
 * Windows clipboard functionality added by David Kotchan (dk)
 *
 * Some functions are also used for Win16 (MS-Windows 3.1).
 */

#include "vimio.h"
#include "vim.h"

#include <conio.h>
#ifdef HAVE_FCNTL_H
# include <fcntl.h>
#endif

/*
 * MS-DOS only code, not used for Win16.
 */
#ifndef WIN16


#include <bios.h>
#ifdef DJGPP
# include <dpmi.h>
# include <signal.h>
# include <sys/movedata.h>
# include <crt0.h>
# ifdef FEAT_CLIPBOARD
#  include <sys/segments.h>
# endif
#else
# include <alloc.h>
#endif

#if defined(DJGPP) || defined(PROTO)
# define _cdecl	    /* DJGPP doesn't have this */
#endif

static int cbrk_pressed = FALSE;    /* set by ctrl-break interrupt */
static int ctrlc_pressed = FALSE;   /* set when ctrl-C or ctrl-break detected */
static int delayed_redraw = FALSE;  /* set when ctrl-C detected */

static int bioskey_read = _NKEYBRD_READ;   /* bioskey() argument: read key */
static int bioskey_ready = _NKEYBRD_READY; /* bioskey() argument: key ready? */

#ifdef FEAT_MOUSE
static int mouse_avail = FALSE;		/* mouse present */
static int mouse_active;		/* mouse enabled */
static int mouse_hidden;		/* mouse not shown */
static int mouse_click = -1;		/* mouse status */
static int mouse_last_click = -1;	/* previous status at click */
static int mouse_x = -1;		/* mouse x coodinate */
static int mouse_y = -1;		/* mouse y coodinate */
static long mouse_click_time = 0;	/* biostime() of last click */
static int mouse_click_count = 0;	/* count for multi-clicks */
static int mouse_click_x = 0;		/* x of previous mouse click */
static int mouse_click_y = 0;		/* y of previous mouse click */
static linenr_T mouse_topline = 0;	/* w_topline at previous mouse click */
#ifdef FEAT_DIFF
static int mouse_topfill = 0;		/* w_topfill at previous mouse click */
#endif
static int mouse_x_div = 8;		/* column = x coord / mouse_x_div */
static int mouse_y_div = 8;		/* line   = y coord / mouse_y_div */
#endif

#define BIOSTICK    55			/* biostime() increases one tick about
					   every 55 msec */

static int orig_attr = 0x0700;		/* video attributes when starting */

static int S_iLeft = 0;			/* Scroll window; these are 1 offset */
static int S_iTop = 0;
static int S_iRight = 0;
static int S_iBottom = 0;

/*
 * Need to remember the values, because we set horizontal and vertical
 * edges separately.
 */
    static void
mywindow(int iLeft, int iTop, int iRight, int iBottom)
{
    S_iLeft = iLeft;
    S_iTop = iTop;
    S_iRight = iRight;
    S_iBottom = iBottom;
    window(iLeft, iTop, iRight, iBottom);
}

#ifdef DJGPP
/*
 * For DJGPP, use our own functions for fast text screens.  JML 1/18/98
 */

unsigned long	S_ulScreenBase = 0xb8000;
unsigned short	S_uiAttribute = 0;
int		S_iCurrentRow = 0;	/* These are 0 offset */
int		S_iCurrentColumn = 0;
short		S_selVideo;	/* Selector for DJGPP direct video transfers */

/*
 * Use burst writes to improve mch_write speed - VJN 01/10/99
 */
unsigned short	S_linebuffer[8000]; /* <VN> enough for 160x50 */
unsigned short	S_blankbuffer[256]; /* <VN> max length of console line */
unsigned short	*S_linebufferpos = S_linebuffer;
int		S_iBufferRow;
int		S_iBufferColumn;

    static void
myflush(void)
{
    if (S_linebufferpos != S_linebuffer)
    {
	_dosmemputw(S_linebuffer, (S_linebufferpos - S_linebuffer),
		S_ulScreenBase
		      + S_iBufferRow * (Columns << 1) + (S_iBufferColumn << 1));
	S_linebufferpos = S_linebuffer;
    }
}

    static void
mygotoxy(int x, int y)
{
    S_iCurrentRow = y - 1;
    S_iCurrentColumn = x - 1;
}

/*
 * Set the system cursor to our cursor position.
 */
    static void
set_sys_cursor(void)
{
    if (term_console && full_screen)
    {
	myflush();
	gotoxy(S_iCurrentColumn + 1, S_iCurrentRow + 1);
    }
}

    static void
setblankbuffer(unsigned short uiValue)
{
    int				i;
    static unsigned short	olduiValue = 0;

    if (olduiValue != uiValue)
    {
	/* Load blank line buffer with spaces */
	for (i = 0; i < Columns; ++i)
	    S_blankbuffer[i] = uiValue;
	olduiValue = uiValue;
    }
}

    static void
myclreol(void)
{
    /* Clear to end of line */
    setblankbuffer(S_uiAttribute | ' ');
    _dosmemputw(S_blankbuffer, S_iRight - S_iCurrentColumn, S_ulScreenBase
			 + (S_iCurrentRow) * (Columns << 1)
			 + (S_iCurrentColumn << 1));
}

    static void
myclrscr(void)
{
    /* Clear whole screen */
    short	iColumn;
    int		endpoint = (Rows * Columns) << 1;

    setblankbuffer(S_uiAttribute | ' ');

    for (iColumn = 0; iColumn < endpoint; iColumn += (Columns << 1))
	_dosmemputw(S_blankbuffer, Columns, S_ulScreenBase + iColumn);
}

    static void
mydelline(void)
{
    short iRow, iColumn;

    iColumn = (S_iLeft - 1) << 1;

    /* Copy the lines underneath */
    for (iRow = S_iCurrentRow; iRow < S_iBottom - 1; iRow++)
	movedata(S_selVideo, (((iRow + 1) * Columns) << 1) + iColumn,
		S_selVideo, ((iRow * Columns) << 1) + iColumn,
		(S_iRight - S_iLeft + 1) << 1);

    /* Clear the new row */
    setblankbuffer(S_uiAttribute | ' ');

    _dosmemputw(S_blankbuffer, (S_iRight - S_iLeft) + 1, S_ulScreenBase
			 + (S_iBottom - 1) * (Columns << 1) + iColumn);
}

    static void
myinsline(void)
{
    short iRow, iColumn;

    iColumn = (S_iLeft - 1) << 1;

    /* Copy the lines underneath */
    for (iRow = S_iBottom - 1; iRow >= S_iTop; iRow--)
	movedata(S_selVideo, (((iRow - 1) * Columns) << 1) + iColumn,
		S_selVideo, ((iRow * Columns) << 1) + iColumn,
		(S_iRight - S_iLeft + 1) << 1);

    /* Clear the new row */
    setblankbuffer(S_uiAttribute | ' ');

    _dosmemputw(S_blankbuffer, (S_iRight - S_iLeft) + 1, S_ulScreenBase
			 + (S_iTop - 1) * (Columns << 1) + iColumn);
}

/*
 * Scroll the screen one line up, clear the last line.
 */
    static void
myscroll(void)
{
    short		iRow, iColumn;

    iColumn = (S_iLeft - 1) << 1;

    /* Copy the screen */
    for (iRow = S_iTop; iRow < S_iBottom; iRow++)
	movedata(S_selVideo, ((iRow * Columns) << 1) + iColumn,
		S_selVideo, (((iRow - 1) * Columns) << 1) + iColumn,
		(S_iRight - S_iLeft + 1) << 1);

    /* Clear the bottom row */
    setblankbuffer(S_uiAttribute | ' ');

    _dosmemputw(S_blankbuffer, (S_iRight - S_iLeft) + 1, S_ulScreenBase
			 + (S_iBottom - 1) * (Columns << 1) + iColumn);
}

    static int
myputch(int iChar)
{
    unsigned short uiValue;

    if (iChar == '\n')
    {
	myflush();
	if (S_iCurrentRow >= S_iBottom - S_iTop)
	    myscroll();
	else
	{
	    S_iCurrentColumn = S_iLeft - 1;
	    S_iCurrentRow++;
	}
    }
    else if (iChar == '\r')
    {
	myflush();
	S_iCurrentColumn = S_iLeft - 1;
    }
    else if (iChar == '\b')
    {
	myflush();
	if (S_iCurrentColumn >= S_iLeft)
	    S_iCurrentColumn--;
    }
    else if (iChar == 7)
    {
	sound(440);	/* short beep */
	delay(200);
	nosound();
    }
    else
    {
	uiValue = S_uiAttribute | (unsigned char)iChar;

	/*
	 * Normal char - are we starting to buffer?
	 */
	if (S_linebufferpos == S_linebuffer)
	{
	    S_iBufferColumn = S_iCurrentColumn;
	    S_iBufferRow = S_iCurrentRow;
	}

	*S_linebufferpos++ = uiValue;

	S_iCurrentColumn++;
	if (S_iCurrentColumn >= S_iRight && S_iCurrentRow >= S_iBottom - S_iTop)
	{
	    myflush();
	    myscroll();
	    S_iCurrentColumn = S_iLeft - 1;
	    S_iCurrentRow++;
	}
    }

    return 0;
}

    static void
mytextinit(struct text_info *pTextinfo)
{
    S_selVideo = __dpmi_segment_to_descriptor(S_ulScreenBase >> 4);
    S_uiAttribute = pTextinfo->normattr << 8;
}

    static void
get_screenbase(void)
{
    static union REGS	    regs;

    /* old Hercules grafic card has different base address (Macewicz) */
    regs.h.ah = 0x0f;
    (void)int86(0x10, &regs, &regs);	/* int 10 0f */
    if (regs.h.al == 0x07)		/* video mode 7 -- hercules mono */
	S_ulScreenBase = 0xb0000;
    else
	S_ulScreenBase = 0xb8000;
}

    static void
mytextattr(int iAttribute)
{
    S_uiAttribute = (unsigned short)iAttribute << 8;
}

    static void
mynormvideo(void)
{
    mytextattr(orig_attr);
}

    static void
mytextcolor(int iTextColor)
{
    S_uiAttribute = (unsigned short)((S_uiAttribute & 0xf000)
					   | (unsigned short)iTextColor << 8);
}

    static void
mytextbackground(int iBkgColor)
{
    S_uiAttribute = (unsigned short)((S_uiAttribute & 0x0f00)
					 | (unsigned short)(iBkgColor << 12));
}
/*
 * Getdigits: Get a number from a string and skip over it.
 * Note: the argument is a pointer to a char_u pointer!
 */

    static long
mygetdigits(pp)
    char_u **pp;
{
    char_u	*p;
    long	retval = 0;

    p = *pp;
    if (*p == '-')		/* skip negative sign */
	++p;
    while (VIM_ISDIGIT(*p))
    {
	retval = (retval * 10) + (*p - '0');
	++p;
    }
    if (**pp == '-')		/* process negative sign */
	retval = -retval;

    *pp = p;
    return retval;
}
#else
# define mygotoxy gotoxy
# define myputch putch
# define myscroll scroll
# define mynormvideo normvideo
# define mytextattr textattr
# define mytextcolor textcolor
# define mytextbackground textbackground
# define mygetdigits getdigits
# define myclreol clreol
# define myclrscr clrscr
# define myinsline insline
# define mydelline delline
#endif

static const struct
{
    char_u	scancode;
    char_u	metakey;
} altkey_table[] =
{
    {0x1e, 0xe1}, /* a */
    {0x30, 0xe2}, /* b */
    {0x2e, 0xe3}, /* c */
    {0x20, 0xe4}, /* d */
    {0x12, 0xe5}, /* e */
    {0x21, 0xe6}, /* f */
    {0x22, 0xe7}, /* g */
    {0x23, 0xe8}, /* h */
    {0x17, 0xe9}, /* i */
    {0x24, 0xea}, /* j */
    {0x25, 0xeb}, /* k */
    {0x26, 0xec}, /* l */
    {0x32, 0xed}, /* m */
    {0x31, 0xee}, /* n */
    {0x18, 0xef}, /* o */
    {0x19, 0xf0}, /* p */
    {0x10, 0xf1}, /* q */
    {0x13, 0xf2}, /* r */
    {0x1f, 0xf3}, /* s */
    {0x14, 0xf4}, /* t */
    {0x16, 0xf5}, /* u */
    {0x2f, 0xf6}, /* v */
    {0x11, 0xf7}, /* w */
    {0x2d, 0xf8}, /* x */
    {0x15, 0xf9}, /* y */
    {0x2c, 0xfa}, /* z */
    {0x78, 0xb1}, /* 1 */
    {0x79, 0xb2}, /* 2 */
    {0x7a, 0xb3}, /* 3 */
    {0x7b, 0xb4}, /* 4 */
    {0x7c, 0xb5}, /* 5 */
    {0x7d, 0xb6}, /* 6 */
    {0x7e, 0xb7}, /* 7 */
    {0x7f, 0xb8}, /* 8 */
    {0x80, 0xb9}, /* 9 */
    {0x81, 0xb0}, /* 0 */
};

/*
 * Translate extended keycodes into meta-chars where applicable
 */
    static int
translate_altkeys(int rawkey)
{
    int i, c;

    if ((rawkey & 0xff) == 0)
    {
	c = (rawkey >> 8);
	for (i = sizeof(altkey_table) / sizeof(altkey_table[0]); --i >= 0; )
	{
	    if (c == altkey_table[i].scancode)
		return (int)altkey_table[i].metakey;
	}
    }
    return rawkey;
}

/*
 * Set normal fg/bg color, based on T_ME.  Called whem t_me has been set.
 */
    void
mch_set_normal_colors()
{
    char_u	*p;
    int		n;

    cterm_normal_fg_color = (orig_attr & 0xf) + 1;
    cterm_normal_bg_color = ((orig_attr >> 4) & 0xf) + 1;
    if (T_ME[0] == ESC && T_ME[1] == '|')
    {
	p = T_ME + 2;
	n = getdigits(&p);
	if (*p == 'm' && n > 0)
	{
	    cterm_normal_fg_color = (n & 0xf) + 1;
	    cterm_normal_bg_color = ((n >> 4) & 0xf) + 1;
	}
    }
}

#if defined(MCH_CURSOR_SHAPE) || defined(PROTO)
/*
 * Save/restore the shape of the cursor.
 * call with FALSE to save, TRUE to restore
 */
    static void
mch_restore_cursor_shape(int restore)
{
    static union REGS	    regs;
    static int		    saved = FALSE;

    if (restore)
    {
	if (saved)
	    regs.h.ah = 0x01;	    /* Set Cursor */
	else
	    return;
    }
    else
    {
	regs.h.ah = 0x03;	    /* Get Cursor */
	regs.h.bh = 0x00;	    /* Page */
	saved = TRUE;
    }

    (void)int86(0x10, &regs, &regs);
}

/*
 * Set the shape of the cursor.
 * 'thickness' can be from 0 (thin) to 7 (block)
 */
    static void
mch_set_cursor_shape(int thickness)
{
    union REGS	    regs;

    regs.h.ch = 7 - thickness;	    /* Starting Line */
    regs.h.cl = 7;		    /* Ending Line */
    regs.h.ah = 0x01;		    /* Set Cursor */
    (void)int86(0x10, &regs, &regs);
}

    void
mch_update_cursor(void)
{
    int		idx;
    int		thickness;

    /*
     * How the cursor is drawn depends on the current mode.
     */
    idx = get_shape_idx(FALSE);

    if (shape_table[idx].shape == SHAPE_BLOCK)
	thickness = 7;
    else
	thickness = (7 * shape_table[idx].percentage + 90) / 100;
    mch_set_cursor_shape(thickness);
}
#endif

/*
 * Return amount of memory currently available.
 */
    long_u
mch_avail_mem(int special)
{
#ifdef DJGPP
    return _go32_dpmi_remaining_virtual_memory();
#else
    return coreleft();
#endif
}

#ifdef FEAT_MOUSE

/*
 * Set area where mouse can be moved to: The whole screen.
 * Rows and Columns must be valid when calling!
 */
    static void
mouse_area(void)
{
    union REGS	    regs;

    if (mouse_avail)
    {
	regs.x.cx = 0;	/* mouse visible between cx and dx */
	regs.x.dx = Columns * mouse_x_div - 1;
	regs.x.ax = 7;
	(void)int86(0x33, &regs, &regs);

	regs.x.cx = 0;	/* mouse visible between cx and dx */
	regs.x.dx = Rows * mouse_y_div - 1;
	regs.x.ax = 8;
	(void)int86(0x33, &regs, &regs);
    }
}

    static void
show_mouse(int on)
{
    static int	    was_on = FALSE;
    union REGS	    regs;

    if (mouse_avail)
    {
	if (!mouse_active || mouse_hidden)
	    on = FALSE;
	/*
	 * Careful: Each switch on must be compensated by exactly one switch
	 * off
	 */
	if ((on && !was_on) || (!on && was_on))
	{
	    was_on = on;
	    regs.x.ax = on ? 1 : 2;
	    int86(0x33, &regs, &regs);	/* show mouse */
	    if (on)
		mouse_area();
	}
    }
}

#endif

/*
 * Version of kbhit() and getch() that use direct console I/O.
 * This avoids trouble with CTRL-P and the like, and should work over a telnet
 * connection (it works for Xvi).
 */

static int cons_key = -1;

/*
 * Try to get one character directly from the console.
 * If there is a key, it is stored in cons_key.
 * Only call when cons_key is -1!
 */
    static void
cons_getkey(void)
{
    union REGS regs;

    /* call DOS function 6: Direct console I/O */
    regs.h.ah = 0x06;
    regs.h.dl = 0xff;
    (void)intdos(&regs, &regs);
    if ((regs.x.flags & 0x40) == 0)	/* zero flag not set? */
	cons_key = (regs.h.al & 0xff);
}

/*
 * Return TRUE if a character is available.
 */
    static int
cons_kbhit(void)
{
    if (cons_key < 0)
	cons_getkey();
    return (cons_key >= 0);
}

/*
 * Return a character from the console.
 * Should only be called when vim_kbhit() returns TRUE.
 */
    static int
cons_getch(void)
{
    int	    c = -1;

    if (cons_key < 0)
	cons_getkey();
    c = cons_key;
    cons_key = -1;
    return c;
}


#ifdef DJGPP
/*
 * DJGPP provides a kbhit() function that goes to the BIOS instead of DOS.
 * This doesn't work for terminals connected to a serial port.
 * Redefine kbhit() here to make it work.
 */
    static int
vim_kbhit(void)
{
    union REGS regs;

    regs.h.ah = 0x0b;
    (void)intdos(&regs, &regs);
    return regs.h.al;
}

#ifdef kbhit
# undef kbhit	    /* might have been defined in conio.h */
#endif
#define kbhit()	vim_kbhit()

#endif

/*
 * Simulate WaitForChar() by slowly polling with bioskey(1) or kbhit().
 *
 * If Vim should work over the serial line after a 'ctty com1' we must use
 * kbhit() and getch(). (jw)
 * Usually kbhit() is not used, because then CTRL-C and CTRL-P
 * will be catched by DOS (mool).
 *
 * return TRUE if a character is available, FALSE otherwise
 */

#define FOREVER 1999999999L

    static  int
WaitForChar(long msec)
{
    long	starttime = 0;

    if (msec != 0)
	starttime = biostime(0, 0L);

    for (;;)
    {
#ifdef FEAT_MOUSE
	long		clicktime;
	static int	old_status = 0;
	union REGS	regs;
	int		x, y;

	if (mouse_avail && mouse_active && mouse_click < 0)
	{
	    regs.x.ax = 3;
	    int86(0x33, &regs, &regs);	    /* check mouse status */
		/* only recognize button-down and button-up event */
	    x = regs.x.cx / mouse_x_div;
	    y = regs.x.dx / mouse_y_div;
	    if ((old_status == 0) != (regs.x.bx == 0))
	    {
		if (old_status)	/* button up */
		    mouse_click = MOUSE_RELEASE;
		else			/* button down */
		{
		    /*
		     * Translate MSDOS mouse events to Vim mouse events.
		     * TODO: should handle middle mouse button, by pressing
		     * left and right at the same time.
		     */
		    if (regs.x.bx & MSDOS_MOUSE_LEFT)
			mouse_click = MOUSE_LEFT;
		    else if (regs.x.bx & MSDOS_MOUSE_RIGHT)
			mouse_click = MOUSE_RIGHT;
		    else if (regs.x.bx & MSDOS_MOUSE_MIDDLE)
			mouse_click = MOUSE_MIDDLE;

		    /*
		     * Find out if this is a multi-click
		     */
		    clicktime = biostime(0, 0L);
		    if (mouse_click_x == x && mouse_click_y == y
			    && mouse_topline == curwin->w_topline
#ifdef FEAT_DIFF
			    && mouse_topfill == curwin->w_topfill
#endif
			    && mouse_click_count != 4
			    && mouse_click == mouse_last_click
			    && clicktime < mouse_click_time
							+ p_mouset / BIOSTICK)
			++mouse_click_count;
		    else
			mouse_click_count = 1;
		    mouse_click_time = clicktime;
		    mouse_last_click = mouse_click;
		    mouse_click_x = x;
		    mouse_click_y = y;
		    mouse_topline = curwin->w_topline;
#ifdef FEAT_DIFF
		    mouse_topfill = curwin->w_topfill;
#endif
		    SET_NUM_MOUSE_CLICKS(mouse_click, mouse_click_count);
		}
	    }
	    else if (old_status && (x != mouse_x || y != mouse_y))
		mouse_click = MOUSE_DRAG;
	    old_status = regs.x.bx;
	    if (mouse_hidden && mouse_x >= 0 && (mouse_x != x || mouse_y != y))
	    {
		mouse_hidden = FALSE;
		show_mouse(TRUE);
	    }
	    mouse_x = x;
	    mouse_y = y;
	}
#endif

	if ((p_consk ? cons_kbhit()
				 : p_biosk ? bioskey(bioskey_ready) : kbhit())
		|| cbrk_pressed
#ifdef FEAT_MOUSE
						    || mouse_click >= 0
#endif
		)
	    return TRUE;
	/*
	 * Use biostime() to wait until our time is done.
	 * We busy-wait here.  Unfortunately, delay() and usleep() have been
	 * reported to give problems with the original Windows 95.  This is
	 * fixed in service pack 1, but not everybody installed that.
	 * The DJGPP implementation of usleep() uses a busy-wait loop too.
	 */
	if (msec == 0 || (msec != FOREVER
			    && biostime(0, 0L) > starttime + msec / BIOSTICK))
	    break;

#ifdef DJGPP
	/* Yield the CPU to the next process. */
	__dpmi_yield();
#endif
    }
    return FALSE;
}

/*
 * don't do anything for about "msec" msec
 */
    void
mch_delay(
    long	msec,
    int		ignoreinput)
{
    long	starttime;

    if (ignoreinput)
    {
	/*
	 * We busy-wait here.  Unfortunately, delay() and usleep() have been
	 * reported to give problems with the original Windows 95.  This is
	 * fixed in service pack 1, but not everybody installed that.
	 */
	starttime = biostime(0, 0L);
	while (biostime(0, 0L) < starttime + msec / BIOSTICK)
	    ;
    }
    else
	WaitForChar(msec);
}

/*
 * mch_write(): write the output buffer to the screen
 */
    void
mch_write(
    char_u	*s,
    int		len)
{
    char_u	*p;
    int		row, col;

    if (term_console && full_screen)
	while (len--)
	{
	    /* translate ESC | sequences into bios calls */
	    if (p_wd)	    /* testing: wait a bit for each char */
		WaitForChar(p_wd);

	    if (s[0] == '\n')
#ifdef DJGPP
	    {
		myflush();
		S_iCurrentColumn = S_iLeft - 1;
	    }
#else
		myputch('\r');
#endif
	    else if (s[0] == ESC && len > 1 && s[1] == '|')
	    {
		switch (s[2])
		{
#ifdef DJGPP
		case 'B':   ScreenVisualBell();
			    goto got3;
#endif
		case 'J':
#ifdef DJGPP
			    myflush();
#endif
			    myclrscr();
			    goto got3;

		case 'K':
#ifdef DJGPP
			    myflush();
#endif
			    myclreol();
			    goto got3;

		case 'L':
#ifdef DJGPP
			    myflush();
#endif
			    myinsline();
			    goto got3;

		case 'M':
#ifdef DJGPP
			    myflush();
#endif
			    mydelline();
got3:			    s += 3;
			    len -= 2;
			    continue;

		case '0':
		case '1':
		case '2':
		case '3':
		case '4':
		case '5':
		case '6':
		case '7':
		case '8':
		case '9':   p = s + 2;
			    row = mygetdigits(&p);    /* no check for length! */
			    if (p > s + len)
				break;
			    if (*p == ';')
			    {
				++p;
				col = mygetdigits(&p); /* no check for length! */
				if (p > s + len)
				    break;
				if (*p == 'H' || *p == 'r' || *p == 'V')
				{
#ifdef DJGPP
				    myflush();
#endif
				    if (*p == 'H')  /* set cursor position */
					mygotoxy(col, row);
				    else if (*p == 'V')
					mywindow(row, S_iTop, col, S_iBottom);
				    else	    /* set scroll region  */
					mywindow(S_iLeft, row, S_iRight, col);
				    len -= p - s;
				    s = p + 1;
				    continue;
				}
			    }
			    else if (*p == 'm' || *p == 'f' || *p == 'b')
			    {
				if (*p == 'm')	    /* set color */
				{
				    if (row == 0)
					mynormvideo();/* reset color */
				    else
					mytextattr(row);
				}
				else if (*p == 'f') /* set foreground color */
				    mytextcolor(row);
				else		    /* set background color */
				    mytextbackground(row);

				len -= p - s;
				s = p + 1;
				continue;
			    }
		}
	    }
	    myputch(*s++);
	}
    else
    {
	write(1, s, (unsigned)len);
    }
}

/*
 * mch_inchar(): low level input funcion.
 * Get a characters from the keyboard.
 * If time == 0 do not wait for characters.
 * If time == n wait a short time for characters.
 * If time == -1 wait forever for characters.
 *
 * return the number of characters obtained
 */
    int
mch_inchar(
    char_u	*buf,
    int		maxlen,
    long	time,
    int		tb_change_cnt)
{
    int		len = 0;
    int		c;
    int		tmp_c;
    static int	nextchar = 0;	    /* may keep character when maxlen == 1 */

    /*
     * if we got a ctrl-C when we were busy, there will be a "^C" somewhere
     * on the sceen, so we need to redisplay it.
     */
    if (delayed_redraw)
    {
	delayed_redraw = FALSE;
	update_screen(CLEAR);
	setcursor();
	out_flush();
    }

    /* return remaining character from last call */
    if (nextchar)
    {
	*buf = nextchar;
	nextchar = 0;
	return 1;
    }

#ifdef FEAT_MOUSE
    if (time != 0)
	show_mouse(TRUE);
#endif
#ifdef DJGPP
    set_sys_cursor();
#endif
    if (time >= 0)
    {
	if (WaitForChar(time) == 0)	/* no character available */
	{
#ifdef FEAT_MOUSE
	    show_mouse(FALSE);
#endif
	    return 0;
	}
    }
    else    /* time == -1 */
    {
	/*
	 * If there is no character available within 2 seconds (default)
	 * write the autoscript file to disk.  Or cause the CursorHold event
	 * to be triggered.
	 */
	if (WaitForChar(p_ut) == 0)
	{
#ifdef FEAT_AUTOCMD
	    if (trigger_cursorhold() && maxlen >= 3)
	    {
		buf[0] = K_SPECIAL;
		buf[1] = KS_EXTRA;
		buf[2] = (int)KE_CURSORHOLD;
		return 3;
	    }
#endif
	    before_blocking();
	}
    }
    WaitForChar(FOREVER);	/* wait for key or mouse click */

/*
 * Try to read as many characters as there are, until the buffer is full.
 */
    /*
     * we will get at least one key. Get more if they are available
     * After a ctrl-break we have to read a 0 (!) from the buffer.
     * bioskey(1) will return 0 if no key is available and when a
     * ctrl-break was typed. When ctrl-break is hit, this does not always
     * implies a key hit.
     */
    cbrk_pressed = FALSE;
#ifdef FEAT_MOUSE
    if (mouse_click >= 0 && maxlen >= 5)
    {
	len = 5;
	*buf++ = ESC + 128;
	*buf++ = 'M';
	*buf++ = mouse_click;
	*buf++ = mouse_x + '!';
	*buf++ = mouse_y + '!';
	mouse_click = -1;
    }
    else
#endif
    {
#ifdef FEAT_MOUSE
	mouse_hidden = TRUE;
#endif
	if (p_biosk && !p_consk)
	{
	    while ((len == 0 || bioskey(bioskey_ready)) && len < maxlen)
	    {
		c = translate_altkeys(bioskey(bioskey_read)); /* get the key */
		/*
		 * translate a few things for inchar():
		 * 0x0000 == CTRL-break		-> 3	(CTRL-C)
		 * 0x0300 == CTRL-@		-> NUL
		 * 0xnn00 == extended key code	-> K_NUL, nn
		 * 0xnne0 == enhanced keyboard	-> K_NUL, nn
		 * K_NUL			-> K_NUL, 3
		 */
		if (c == 0)
		    c = 3;
		else if (c == 0x0300)
		    c = NUL;
		else if ((c & 0xff) == 0
			|| c == K_NUL
			|| c == 0x4e2b
			|| c == 0x4a2d
			|| c == 0x372a
			|| ((c & 0xff) == 0xe0 && c != 0xe0))
		{
		    if (c == K_NUL)
			c = 3;
		    else
			c >>= 8;
		    *buf++ = K_NUL;
		    ++len;
		}

		if (len < maxlen)
		{
		    *buf++ = c;
		    len++;
#ifdef FEAT_MBYTE
		    /* Convert from 'termencoding' to 'encoding'. Only
		     * translate normal characters, not key codes. */
		    if (input_conv.vc_type != CONV_NONE
					    && (len == 1 || buf[-2] != K_NUL))
			len += convert_input(buf - 1, 1, maxlen - len + 1) - 1;
#endif
		}
		else
		    nextchar = c;
	    }
	}
	else
	{
	    while ((len == 0 || (p_consk ? cons_kbhit() : kbhit()))
		    && len < maxlen)
	    {
		switch (c = (p_consk ? cons_getch() : getch()))
		{
		    case 0:
			/* NUL means that there is another character.
			 * Get it immediately, because kbhit() doesn't always
			 * return TRUE for the second character.
			 */
			if (p_consk)
			    c = cons_getch();
			else
			    c = getch();
			tmp_c = translate_altkeys(c << 8);
			if (tmp_c == (c << 8))
			{
			    *buf++ = K_NUL;
			    ++len;
			}
			else
			    c = tmp_c;
			break;
		    case K_NUL:
			*buf++ = K_NUL;
			++len;
			c = 3;
			break;
		    case 3:
			cbrk_pressed = TRUE;
			/*FALLTHROUGH*/
		    default:
			break;
		}
		if (len < maxlen)
		{
		    *buf++ = c;
		    ++len;
		}
		else
		    nextchar = c;
	    }
	}
    }
#ifdef FEAT_MOUSE
    show_mouse(FALSE);
#endif

    beep_count = 0;	    /* may beep again now that we got some chars */
    return len;
}

/*
 * return non-zero if a character is available
 */
    int
mch_char_avail(void)
{
    return WaitForChar(0L);
}

#ifdef DJGPP
# define INT_ARG    int
#else
# define INT_ARG
#endif

/*
 * function for ctrl-break interrupt
 */
    static void interrupt
#ifdef DJGPP
catch_cbrk(int a)
#else
catch_cbrk(void)
#endif
{
    cbrk_pressed = TRUE;
    ctrlc_pressed = TRUE;
}

#ifndef DJGPP
/*
 * ctrl-break handler for DOS. Never called when a ctrl-break is typed, because
 * we catch interrupt 1b. If you type ctrl-C while Vim is waiting for a
 * character this function is not called. When a ctrl-C is typed while Vim is
 * busy this function may be called. By that time a ^C has been displayed on
 * the screen, so we have to redisplay the screen. We can't do that here,
 * because we may be called by DOS. The redraw is in mch_inchar().
 */
    static int _cdecl
cbrk_handler(void)
{
    delayed_redraw = TRUE;
    return 1;		    /* resume operation after ctrl-break */
}

/*
 * function for critical error interrupt
 * For DOS 1 and 2 return 0 (Ignore).
 * For DOS 3 and later return 3 (Fail)
 */
    static void interrupt
catch_cint(bp, di, si, ds, es, dx, cx, bx, ax)
    unsigned bp, di, si, ds, es, dx, cx, bx, ax;
{
    ax = (ax & 0xff00);	    /* set AL to 0 */
    if (_osmajor >= 3)
	ax |= 3;	    /* set AL to 3 */
}
#endif

/*
 * Set the interrupt vectors for use with Vim on or off.
 * on == TRUE means as used within Vim
 */
    static void
set_interrupts(int on)
{
    static int saved_cbrk;
#ifndef DJGPP
    static void interrupt (*old_cint)();
#endif
    static void interrupt (*old_cbrk)(INT_ARG);

    if (on)
    {
	saved_cbrk = getcbrk();		/* save old ctrl-break setting */
	setcbrk(0);			/* do not check for ctrl-break */
#ifdef DJGPP
	old_cbrk = signal(SIGINT, catch_cbrk);	/* critical error interrupt */
#else
	old_cint = getvect(0x24);	/* save old critical error interrupt */
	setvect(0x24, catch_cint);	/* install our critical error interrupt */
	old_cbrk = getvect(0x1B);	/* save old ctrl-break interrupt */
	setvect(0x1B, catch_cbrk);	/* install our ctrl-break interrupt */
	ctrlbrk(cbrk_handler);		/* vim's ctrl-break handler */
#endif
	if (term_console)
	    out_str(T_ME);		/* set colors */
    }
    else
    {
	setcbrk(saved_cbrk);		/* restore ctrl-break setting */
#ifdef DJGPP
	signal(SIGINT,old_cbrk);	/* critical error interrupt */
#else
	setvect(0x24, old_cint);	/* restore critical error interrupt */
	setvect(0x1B, old_cbrk);	/* restore ctrl-break interrupt */
#endif
	/* restore ctrl-break handler, how ??? */
	if (term_console)
	    mynormvideo();		/* restore screen colors */
    }
}

/*
 * We have no job control, fake it by starting a new shell.
 */
    void
mch_suspend(void)
{
    suspend_shell();
}

extern int _fmode;

/*
 * Prepare window for use by Vim.
 */
    void
mch_init(void)
{
    union REGS regs;

#if defined(DJGPP) && defined(FEAT_CLIPBOARD)
    __dpmi_regs  dpmi_regs;
#endif

    /*
     * Get the video attributes at the cursor.  These will be used as the
     * default attributes.
     */
    regs.h.ah = 0x08;
    regs.h.bh = 0x00;		/* video page 0 */
    int86(0x10, &regs, &regs);
    orig_attr = regs.h.ah;
    mynormvideo();
    if (cterm_normal_fg_color == 0)
	cterm_normal_fg_color = (orig_attr & 0xf) + 1;
    if (cterm_normal_bg_color == 0)
	cterm_normal_bg_color = ((orig_attr >> 4) & 0xf) + 1;

    term_console = TRUE;    /* assume using the console for the things here */
    _fmode = O_BINARY;	    /* we do our own CR-LF translation */
    out_flush();
    set_interrupts(TRUE);   /* catch interrupts */

#ifdef DJGPP
    /*
     * Use Long File Names by default, if $LFN not set.
     */
    if (getenv("LFN") == NULL)
	putenv("LFN=y");

    get_screenbase();
#endif

#ifdef FEAT_MOUSE
/* find out if a MS compatible mouse is available */
    regs.x.ax = 0;
    (void)int86(0x33, &regs, &regs);
    mouse_avail = regs.x.ax;
    /* best guess for mouse coordinate computations */
    mch_get_shellsize();
    if (Columns <= 40)
	mouse_x_div = 16;
    if (Rows == 30)
	mouse_y_div = 16;
#endif

    /*
     * Try switching to 16 colors for background, instead of 8 colors and
     * blinking.  Does this always work?  Can the old value be restored?
     */
    regs.x.ax = 0x1003;
    regs.h.bl = 0x00;
    regs.h.bh = 0x00;
    int86(0x10, &regs, &regs);

    /*
     * Test if we have an enhanced AT keyboard.  Write 0xFFFF to the keyboard
     * buffer and try to read it back.  If we can't in 16 tries, it's an old
     * type XT keyboard.
     */
    regs.h.ah = 0x05;
    regs.x.cx = 0xffff;
    int86(0x16, &regs, &regs);
    if (regs.h.al != 1)	/* skip this when keyboard buffer is full */
    {
	int i;

	for (i = 0; i < 16; ++i)
	{
	    regs.h.ah = 0x10;
	    int86(0x16, &regs, &regs);
	    if (regs.x.ax == 0xffff)
		break;
	}
	if (i == 16)	/* 0xffff not read, must be old keyboard */
	{
	    bioskey_read = 0;
	    bioskey_ready = 1;
	}
    }

#ifdef MCH_CURSOR_SHAPE
    /* Save the old cursor shape */
    mch_restore_cursor_shape(FALSE);
    /* Initialise the cursor shape */
    mch_update_cursor();
#endif

#if defined(DJGPP) && defined(FEAT_CLIPBOARD)
    /*
     * Check to see if the Windows clipboard is available, ie. are we
     * running from a DOS session within Windows.  Obviously, the Windows
     * clipboard will not be available if we're running under pure DOS.
     *
     * int 0x2f, AX = 0x1700 identifies the Windows version we're running
     * under.  Upon return from the interrupt, if AX is unchanged, we're
     * running under pure DOS and no Windows clipboard is available.
     *
     * Remark: could use int86() here but __dpmi_int() is recommended in
     * the DJGPP docs, since int86() doesn't cover all available interrupts.
     */
    dpmi_regs.x.ax = 0x1700;
    if (__dpmi_int(0x2f, &dpmi_regs) == -1)
	/* real-mode interrupt failed? */
	dpmi_regs.x.ax = 0x1700;	/* force failure */

    if (dpmi_regs.x.ax == 0x1700)	/* no change in AX? */
	clip_init(FALSE);		/* no clipboard available, too bad */
    else				/* else, running under Windows, OK */
	clip_init(TRUE);		/* clipboard is available */
#endif
}

    int
mch_check_win(
    int		argc,
    char	**argv)
{
    /* store argv[0], may be used for $VIM */
    if (*argv[0] != NUL)
	exe_name = FullName_save((char_u *)argv[0], FALSE);

    /*
     * Try the DOS search path.  The executable may in
     * fact be called differently, so try this last.
     */
    if (exe_name == NULL || *exe_name == NUL)
	exe_name = searchpath("vim.exe");

    if (isatty(1))
	return OK;
    return FAIL;
}

/*
 * Return TRUE if the input comes from a terminal, FALSE otherwise.
 */
    int
mch_input_isatty(void)
{
    if (isatty(read_cmd_fd))
	return TRUE;
    return FALSE;
}

#if defined(USE_FNAME_CASE) || defined(PROTO)
/*
 * fname_case(): Set the case of the file name, if it already exists.
 * TODO: should expand short to long file names.  Need to use DOS interrupts,
 * see DJGPP sources libc/dos/dir/findfirs.c.
 */
    void
fname_case(char_u *name, int len)
{
    char_u	    *tail;
    struct ffblk    fb;

    slash_adjust(name);
    if (findfirst(name, &fb, 0) == 0)
    {
	tail = gettail(name);
	if (len == 0 ? STRLEN(tail) == STRLEN(fb.ff_name)
		: (tail - name) + STRLEN(fb.ff_name) < len)
	    STRCPY(tail, fb.ff_name);
    }
}
#endif

/*
 * return process ID
 */
    long
mch_get_pid(void)
{
    return (long)0;
}

/*
 * Change default drive (just like _chdrive of Borland C 3.1)
 */
    static int
change_drive(int drive)
{
    union REGS regs;

    regs.h.ah = 0x0e;
    regs.h.dl = drive - 1;
    intdos(&regs, &regs);   /* set default drive */
    regs.h.ah = 0x19;
    intdos(&regs, &regs);   /* get default drive */
    if (regs.h.al == drive - 1)
	return 0;
    return -1;
}

/*
 * Get absolute file name into buffer 'buf' of length 'len' bytes.
 * All slashes are replaced with backslashes, to avoid trouble when comparing
 * file names.  When 'shellslash' set do it the other way around.
 *
 * return FAIL for failure, OK otherwise
 */
    int
mch_FullName(
    char_u	*fname,
    char_u	*buf,
    int		len,
    int		force)
{
    if (!force && mch_isFullName(fname))	/* already expanded */
    {
	vim_strncpy(buf, fname, len - 1);
	slash_adjust(buf);
	return OK;
    }

#ifdef __BORLANDC__		/* Only Borland C++ has this */
    if (_fullpath((char *)buf, (char *)fname, len - 1) == NULL)
	return FAIL;
    return OK;
#else			/* almost the same as mch_FullName() in os_unix.c */
    {
# if 1
	char_u	fullpath[MAXPATHL];

	if (!_truename(fname, fullpath))
	    return FAIL;
	slash_adjust(fullpath);	    /* Only needed when 'shellslash' set */
	vim_strncpy(buf, fullpath, len - 1);
	return OK;

# else  /* Old code, to be deleted... */
	int	l;
	char_u	olddir[MAXPATHL];
	char_u	*p, *q;
	int	c;
	int	retval = OK;

	*buf = 0;
	/*
	 * change to the directory for a moment,
	 * and then do the getwd() (and get back to where we were).
	 * This will get the correct path name with "../" things.
	 */
	p = vim_strrchr(fname, '/');
	q = vim_strrchr(fname, '\\');
	if (q != NULL && (p == NULL || q > p))
	    p = q;
	q = vim_strrchr(fname, ':');
	if (q != NULL && (p == NULL || q > p))
	    p = q;
	if (p != NULL)
	{
	    if (getcwd(olddir, MAXPATHL) == NULL)
	    {
		p = NULL;	/* can't get current dir: don't chdir */
		retval = FAIL;
	    }
	    else
	    {
		if (p == fname)			/* /fname	    */
		    q = p + 1;			/* -> /		    */
		else if (q + 1 == p)		/* ... c:\foo	    */
		    q = p + 1;			/* -> c:\	    */
		else				/* but c:\foo\bar   */
		    q = p;			/* -> c:\foo	    */

		c = *q;			/* truncate at start of fname */
		*q = NUL;
# ifdef DJGPP
		STRCPY(buf, fname);
		slash_adjust(buf);	/* needed when fname starts with \ */
		if (mch_chdir(buf))	/* change to the directory */
# else
		if (mch_chdir(fname))	/* change to the directory */
# endif
		    retval = FAIL;
		else
		{
		    fname = q;
		    if (c == psepc)	    /* if we cut the name at a */
			fname++;	    /* '\', don't add it again */
		}
		*q = c;
	    }
	}
	if (getcwd(buf, len) == NULL)
	{
	    retval = FAIL;
	    *buf = NUL;
	}
#  ifdef USE_FNAME_CASE
	else
	{
	    char_u	*head;
	    char_u	*tail;
	    struct ffblk fb;
	    int		c;
	    int		added;

	    /* Apparently "longna~1" isn't expanded by getcwd(), at least not
	     * for DJGPP.  Expand it here.  Have to do each dirname
	     * separately. */
	    slash_adjust(buf);
	    head = buf;
	    if (isalpha(*head) && head[1] == ':')
		head += 2;	/* skip "c:" */
	    while (*head != NUL)
	    {
		/* Advance "head" to the start of a dirname and "tail" to just
		 * after it. */
		while (*head == '/' || *head == '\\')
		    ++head;
		for (tail = head; *tail != NUL; ++tail)
		    if (*tail == '/' || *tail == '\\')
			break;
		c = *tail;
		*tail = NUL;

		if (findfirst(buf, &fb, FA_DIREC) == 0)
		{
		    added = STRLEN(fb.ff_name);
		    if ((head - buf) + added + STRLEN(tail + 1) + 2 < len)
		    {
			added -= (tail - head);
			if (added != 0)
			    mch_memmove(tail + 1 + added, tail + 1,
							STRLEN(tail + 1) + 1);
			STRCPY(head, fb.ff_name);
			tail += added;
		    }
		}
		*tail = c;
		head = tail;
	    }
	}
#  endif
	if (p != NULL)
	    mch_chdir(olddir);
	/*
	 * Concatenate the file name to the path.
	 */
	if (*fname != NUL)
	{
	    l = STRLEN(buf);
	    if (l > 0 && buf[l - 1] != '/' && buf[l - 1] != '\\')
		strcat(buf, pseps);
	    strcat(buf, fname);
	}
	return retval;
# endif
    }
#endif
}

/*
 * Replace all slashes by backslashes.
 * This used to be the other way around, but MS-DOS sometimes has problems
 * with slashes (e.g. in a command name).  We can't have mixed slashes and
 * backslashes, because comparing file names will not work correctly.  The
 * commands that use a file name should try to avoid the need to type a
 * backslash twice.
 * When 'shellslash' set do it the other way around.
 */
    void
slash_adjust(char_u *p)
{
#ifdef OLD_DJGPP    /* this seems to have been fixed in DJGPP 2.01 */
    /* DJGPP can't handle a file name that starts with a backslash, and when it
     * starts with a slash there should be no backslashes */
    if (*p == '\\' || *p == '/')
	while (*p)
	{
	    if (*p == '\\')
		*p = '/';
	    mb_ptr_adv(p);
	}
    else
#endif
    while (*p)
    {
	if (*p == psepcN)
	    *p = psepc;
	mb_ptr_adv(p);
    }
}

/*
 * Return TRUE if "fname" does not depend on the current directory.
 */
    int
mch_isFullName(char_u *fname)
{
    /* A name like "d:/foo" and "//server/share" is absolute */
    return (fname[0] != NUL && fname[1] == ':'
				     && (fname[2] == '/' || fname[2] == '\\'))
	|| (fname[0] == fname[1] && (fname[0] == '/' || fname[0] == '\\'));
}


    void
mch_early_init(void)
{
}

/*
 * Careful: mch_exit() may be called before mch_init()!
 */
    void
mch_exit(int r)
{
    settmode(TMODE_COOK);
    stoptermcap();
    set_interrupts(FALSE);	    /* restore interrupts */
#ifdef DJGPP
    set_sys_cursor();
#endif
    /* Somehow outputting CR-NL causes the original colors to be restored */
    out_char('\r');
    out_char('\n');
    out_flush();
    ml_close_all(TRUE);		    /* remove all memfiles */
#ifdef MCH_CURSOR_SHAPE
    mch_restore_cursor_shape(TRUE);
#endif
    exit(r);
}

/*
 * set the tty in (raw) ? "raw" : "cooked" mode
 * Does not change the tty, as bioskey() and kbhit() work raw all the time.
 */
    void
mch_settmode(int tmode)
{
}

#ifdef FEAT_MOUSE
    void
mch_setmouse(int on)
{
    mouse_active = on;
    mouse_hidden = TRUE;	/* dont show it until moved */
}
#endif

/*
 * set screen mode
 * return FAIL for failure, OK otherwise
 */
    int
mch_screenmode(char_u *arg)
{
    int		    mode;
    int		    i;
    static char	   *(names[]) = {"BW40", "C40", "BW80", "C80", "MONO", "C4350"};
    static int	    modes[]   = { BW40,	  C40,	 BW80,	 C80,	MONO,	C4350};

    mode = -1;
    if (VIM_ISDIGIT(*arg))		    /* mode number given */
	mode = atoi((char *)arg);
    else
    {
	for (i = 0; i < sizeof(names) / sizeof(char_u *); ++i)
	    if (stricmp(names[i], (char *)arg) == 0)
	    {
		mode = modes[i];
		break;
	    }
    }
    if (mode == -1)
    {
	EMSG("E362: Unsupported screen mode");
	return FAIL;
    }
    textmode(mode);		    /* use Borland function */
#ifdef DJGPP
    /* base address may have changed */
    get_screenbase();
#endif

    /* Screen colors may have changed. */
    out_str(T_ME);

#ifdef FEAT_MOUSE
    if (mode <= 1 || mode == 4 || mode == 5 || mode == 13 || mode == 0x13)
	mouse_x_div = 16;
    else
	mouse_x_div = 8;
    if (mode == 0x11 || mode == 0x12)
	mouse_y_div = 16;
    else if (mode == 0x10)
	mouse_y_div = 14;
    else
	mouse_y_div = 8;
    shell_resized();
#endif
    return OK;
}

/*
 * Structure used by Turbo-C/Borland-C to store video parameters.
 */
#ifndef DJGPP
extern struct text_info _video;
#endif

/*
 * try to get the real window size
 * return FAIL for failure, OK otherwise
 */
    int
mch_get_shellsize(void)
{
    struct text_info textinfo;

    /*
     * The screenwidth is returned by the BIOS OK.
     * The screenheight is in a location in the bios RAM, if the display is
     * EGA or VGA.
     */
    if (!term_console)
	return FAIL;
    gettextinfo(&textinfo);
    Columns = textinfo.screenwidth;
    Rows = textinfo.screenheight;
#ifndef DJGPP
    if (textinfo.currmode > 10)
	Rows = *(char far *)MK_FP(0x40, 0x84) + 1;
#endif

    if (Columns < MIN_COLUMNS || Rows < MIN_LINES)
    {
	/* these values are overwritten by termcap size or default */
	Columns = 80;
	Rows = 25;
	return FAIL;
    }
#ifdef DJGPP
    mytextinit(&textinfo);   /* Added by JML, 1/15/98 */
#endif

    return OK;
}

/*
 * Set the active window for delline/insline.
 */
    static void
set_window(void)
{
    if (term_console)
    {
#ifndef DJGPP
	_video.screenheight = Rows;
#endif
	mywindow(1, 1, Columns, Rows);
    }
    screen_start();
}

    void
mch_set_shellsize(void)
{
    /* Should try to set the window size to Rows and Columns.
     * May involve switching display mode....
     * We assume the user knows the size and just use it. */
}

/*
 * Rows and/or Columns has changed.
 */
    void
mch_new_shellsize()
{
#ifdef FEAT_MOUSE
    /* best guess for mouse coordinate computations */
    if (Columns <= 40)
	mouse_x_div = 16;
    if (Rows == 30)
	mouse_y_div = 16;
#endif
    set_window();
#ifdef FEAT_MOUSE
    mouse_area();	/* set area where mouse can go */
#endif
}

#if defined(DJGPP) || defined(PROTO)
/*
 * Check the number of Columns with a BIOS call.  This avoids a crash of the
 * DOS console when 'columns' is set to a too large value.
 */
    void
mch_check_columns()
{
    static union REGS	regs;

    regs.h.ah = 0x0f;
    (void)int86(0x10, &regs, &regs);
    if ((unsigned)Columns > (unsigned)regs.h.ah)
	Columns = (unsigned)regs.h.ah;
}
#endif

/*
 * call shell, return FAIL for failure, OK otherwise
 * options: SHELL_*, see vim.h.
 */
    int
mch_call_shell(
    char_u	*cmd,
    int		options)
{
    int		x;
    int		tmode = cur_tmode;
#ifndef DJGPP
    char_u	*newcmd;
#endif

    out_flush();
#ifdef DJGPP
    set_sys_cursor();
#endif

    if (options & SHELL_COOKED)
	settmode(TMODE_COOK);	/* set to normal mode */
    set_interrupts(FALSE);	/* restore interrupts */

#ifdef DJGPP
    /* ignore signals while external command is running */
    signal(SIGINT, SIG_IGN);
    signal(SIGHUP, SIG_IGN);
    signal(SIGQUIT, SIG_IGN);
    signal(SIGTERM, SIG_IGN);
#endif
    if (cmd == NULL)
	x = system((char *)p_sh);
    else
    {
#ifdef DJGPP
	/*
	 * Use 'shell' for system().
	 */
	setenv("SHELL", (char *)p_sh, 1);
	x = system(cmd);
#else
	/* we use "command" to start the shell, slow but easy */
	newcmd = alloc(STRLEN(p_sh) + STRLEN(p_shcf) + STRLEN(cmd) + 3);
	if (newcmd == NULL)
	    x = -1;
	else
	{
	    sprintf((char *)newcmd, "%s %s %s", p_sh, p_shcf, cmd);
	    x = system((char *)newcmd);
	    vim_free(newcmd);
	}
#endif
    }
#ifdef DJGPP
    signal(SIGINT, SIG_DFL);
    signal(SIGHUP, SIG_DFL);
    signal(SIGQUIT, SIG_DFL);
    signal(SIGTERM, SIG_DFL);
#endif
    if (tmode == TMODE_RAW)
	settmode(TMODE_RAW);	/* set to raw mode */
    set_interrupts(TRUE);	/* catch interrupts */

    if (x && !(options & SHELL_SILENT) && !emsg_silent)
    {
	MSG_PUTS("\nshell returned ");
	msg_outnum((long)x);
	msg_putchar('\n');
    }

    return x;
}

/*
 * check for an "interrupt signal": CTRL-break or CTRL-C
 */
    void
mch_breakcheck(void)
{
    if (ctrlc_pressed)
    {
	ctrlc_pressed = FALSE;
	got_int = TRUE;
    }
}

/*
 * Return TRUE if "p" contain a wildcard that can be expanded by
 * dos_expandpath().
 */
    int
mch_has_exp_wildcard(char_u *p)
{
    for ( ; *p; mb_ptr_adv(p))
    {
	if (vim_strchr((char_u *)"?*[", *p) != NULL
		|| (*p == '~' && p[1] != NUL))
	    return TRUE;
    }
    return FALSE;
}

/*
 * Return TRUE if "p" contain a wildcard or a "~1" kind of thing (could be a
 * shortened file name).
 */
    int
mch_has_wildcard(char_u *p)
{
    for ( ; *p; mb_ptr_adv(p))
    {
	if (vim_strchr((char_u *)
#  ifdef VIM_BACKTICK
				    "?*$[`"
#  else
				    "?*$["
#  endif
						, *p) != NULL
		|| (*p == '~' && p[1] != NUL))
	    return TRUE;
    }
    return FALSE;
}

/*
 * Change directory to "path".
 * The normal chdir() does not change the default drive.  This one does.
 * Return 0 for success, -1 for failure.
 */
    int
mch_chdir(char *path)
{
    if (path[0] == NUL)		    /* just checking... */
	return 0;
    if (path[1] == ':')		    /* has a drive name */
    {
	if (change_drive(TOLOWER_ASC(path[0]) - 'a' + 1))
	    return -1;		    /* invalid drive name */
	path += 2;
    }
    if (*path == NUL)		    /* drive name only */
	return 0;
    return chdir(path);		    /* let the normal chdir() do the rest */
}

#ifdef DJGPP
/*
 * mch_rename() works around a bug in rename (aka MoveFile) in
 * Windows 95: rename("foo.bar", "foo.bar~") will generate a
 * file whose short file name is "FOO.BAR" (its long file name will
 * be correct: "foo.bar~").  Because a file can be accessed by
 * either its SFN or its LFN, "foo.bar" has effectively been
 * renamed to "foo.bar", which is not at all what was wanted.  This
 * seems to happen only when renaming files with three-character
 * extensions by appending a suffix that does not include ".".
 * Windows NT gets it right, however, with an SFN of "FOO~1.BAR".
 * This works like mch_rename in os_win32.c, but is a bit simpler.
 *
 * Like rename(), returns 0 upon success, non-zero upon failure.
 * Should probably set errno appropriately when errors occur.
 */

    int
mch_rename(const char *OldFile, const char *NewFile)
{
    char_u  *TempFile;
    int	    retval;
    int	    fd;

    /* rename() works correctly without long file names, so use that */
    if (!_USE_LFN)
	return rename(OldFile, NewFile);

    if ((TempFile = alloc((unsigned)(STRLEN(OldFile) + 13))) == NULL)
	return -1;

    STRCPY(TempFile, OldFile);
    STRCPY(gettail(TempFile), "axlqwqhy.ba~");
    if (rename(OldFile, TempFile))
	retval = -1;
    else
    {
	/* now create an empty file called OldFile; this prevents
	 * the operating system using OldFile as an alias (SFN)
	 * if we're renaming within the same directory.  For example,
	 * we're editing a file called filename.asc.txt by its SFN,
	 * filena~1.txt.  If we rename filena~1.txt to filena~1.txt~
	 * (i.e., we're making a backup while writing it), the SFN
	 * for filena~1.txt~ will be filena~1.txt, by default, which
	 * will cause all sorts of problems later in buf_write().  So, we
	 * create an empty file called filena~1.txt and the system will have
	 * to find some other SFN for filena~1.txt~, such as filena~2.txt
	 */
	if ((fd = open(OldFile, O_RDWR|O_CREAT|O_EXCL, 0444)) < 0)
	    return -1;
	retval = rename(TempFile, NewFile);
	close(fd);
	mch_remove((char_u *)OldFile);

	/* If renaming to NewFile failed, rename TempFile back to OldFile, so
	 * that it looks like nothing happened. */
	if (retval)
	    rename(TempFile, OldFile);
    }
    vim_free(TempFile);

    return retval;  /* success */
}
#endif

#if defined(DJGPP) || defined(PROTO)
/*
 * setlocale() for DJGPP with MS-DOS codepage support
 * Author: Cyril Slobin <slobin@fe.msk.ru>
 *
 * Scaled down a lot for use by Vim: Only support setlocale(LC_ALL, "").
 */

#undef setlocale

#include <go32.h>
#include <inlines/ctype.ha>
#include <locale.h>

#define UPCASE (__dj_ISALNUM | __dj_ISALPHA | __dj_ISGRAPH | __dj_ISPRINT | __dj_ISUPPER)
#define LOCASE (__dj_ISALNUM | __dj_ISALPHA | __dj_ISGRAPH | __dj_ISPRINT | __dj_ISLOWER)

    char *
djgpp_setlocale(void)
{
    __dpmi_regs regs;
    struct { char id; unsigned short off, seg; } __attribute__ ((packed)) info;
    unsigned char buffer[0x82], lower, upper;
    int i;

    regs.x.ax = 0x6502;
    regs.x.bx = 0xffff;
    regs.x.dx = 0xffff;
    regs.x.cx = 5;
    regs.x.es = __tb >> 4;
    regs.x.di = __tb & 0xf;

    __dpmi_int(0x21, &regs);

    if (regs.x.flags & 1)
	return NULL;

    dosmemget(__tb, 5, &info);
    dosmemget((info.seg << 4) + info.off, 0x82, buffer);

    if (*(short *)buffer != 0x80)
	return NULL;

    /* Fix problem of underscores being replaced with y-umlaut. (Levin) */
    if (buffer[26] == 0x5f)
	buffer[26] = 0x98;

    for (i = 0; i < 0x80; i++)
    {
	lower = i + 0x80;
	upper = (buffer+2)[i];
	if (lower != upper)
	{
	    __dj_ctype_flags[lower+1] = LOCASE;
	    __dj_ctype_toupper[lower+1] = upper;
	    if (__dj_ctype_flags[upper+1] == 0)
		__dj_ctype_flags[upper+1] = UPCASE;
	    if (__dj_ctype_tolower[upper+1] == upper)
		__dj_ctype_tolower[upper+1] = lower;
	}
    }

    return "C";
}

#if defined(FEAT_CLIPBOARD) || defined(PROTO)

/*
 * Clipboard stuff, for cutting and pasting text to other windows.
 *
 * Implementation of DOS/Windows clipboard data transfer
 * by David Kotchan (dkotchan@sympatico.ca)
 */

#define CF_TEXT	    0x01    /* Windows clipboard format: Windows (ANSI) text */
#define CF_OEMTEXT  0x07    /* Windows clipboard format: OEM (DOS) text */
#define CF_VIMCLIP  0x04    /* trick: SYLK clipboard format for VimClipboard */

static int Win16OpenClipboard(void);
static int Win16CloseClipboard(void);
static int Win16EmptyClipboard(void);
static char_u *Win16GetClipboardData(int clip_data_format);
static int Win16SetClipboardData(int clip_data_format, char_u *clip_data, int clip_data_size, int clip_data_type);

/*
 * Make vim the owner of the current selection.  Return OK upon success.
 */
    int
clip_mch_own_selection(VimClipboard *cbd)
{
    /*
     * Never actually own the clipboard.  If another application sets the
     * clipboard, we don't want to think that we still own it.
     */
    return FAIL;
}

/*
 * Make vim NOT the owner of the current selection.
 */
    void
clip_mch_lose_selection(VimClipboard *cbd)
{
    /* Nothing needs to be done here */
}

/*
 * Read the Windows clipboard text and put it in Vim's clipboard register.
 */
    void
clip_mch_request_selection(VimClipboard *cbd)
{
    int		type = MCHAR;
    char_u	*pAllocated = NULL;
    char_u	*pClipText = NULL;
    int		clip_data_format = 0;

    if (Win16OpenClipboard())
    {
	/* Check for Vim's own clipboard format first.  The CF_VIMCLIP format
	 * is just ordinary text (like CF_TEXT) except prepended by the
	 * selection type (as a single character).  Note that under DOS we
	 * actually cannot define a custom CF_VIMCLIP clipboard format; we
	 * use instead one of the existing Windows-defined formats, usually
	 * "DIF" or "SYLK".  See Win16GetClipboardData() for details.
	 *
	 * Note that Win16GetClipboardData() returns the address of the memory
	 * block it allocated.  This is not necessary the start of the
	 * clipboard text data: there may be other bytes ahead of the
	 * text (particularly for CF_VIMCLIP) which are used for data
	 * management.  So pClipText is not necessarily == pAllocated.
	 */

	if ((pAllocated = Win16GetClipboardData(CF_VIMCLIP)) != NULL)
	{
	    clip_data_format = CF_VIMCLIP;
	    pClipText = pAllocated;

	    switch (*pClipText++)	/* after ++, pClipText points to text */
	    {
		default:
		case 'L':	type = MLINE;	break;
		case 'C':	type = MCHAR;	break;
#ifdef FEAT_VISUAL
		case 'B':	type = MBLOCK;	break;
#endif
	    }
	}

	/* Otherwise, check for the normal Windows text formats.  There are
	 * two of these: CF_TEXT (common) and CF_OEMTEXT (used for DOS
	 * compatibility).  Experiments show that, under the DOS/Windows
	 * clipboard interface, writing CF_TEXT data to the clipboard
	 * automatically creates a CF_OEMTEXT format as well.
	 */

	else if ((pAllocated = Win16GetClipboardData(CF_TEXT)) != NULL)
	{
	    clip_data_format = CF_TEXT;
	    pClipText = pAllocated;
	    type = (vim_strchr((char*)pClipText, '\r') != NULL) ? MLINE : MCHAR;
	}

	else if ((pAllocated = Win16GetClipboardData(CF_OEMTEXT)) != NULL)
	{
	    clip_data_format = CF_OEMTEXT;
	    pClipText = pAllocated;
	    type = (vim_strchr((char*)pClipText, '\r') != NULL) ? MLINE : MCHAR;
	}

	/* Did we get anything? */

	if (pClipText != NULL)
	{
	    char_u *pDest;
	    char_u *pStart;
	    char_u *pEnd;

	    long_u clip_data_size = 0;

	    /* The Windows clipboard normally stores its text lines terminated
	     * by <CR><NL>.  But Vim uses only <NL>, so translate the <CR><NL>
	     * into <NL>.  Also, watch for possible null bytes at the end of
	     * pClipText.  These are padding added by "get_clipboard_data"
	     * (int 0x2f, AX= 0x1705) in order to round the data size up to the
	     * next multiple of 32 bytes.  See Win16GetClipboardData() for
	     * details.
	     */

	    pDest = strstr( pClipText, "\r\n" );    /* find first <CR><NL> */

	    if (pDest != NULL)			/* found one? */
	    {
		pStart = pDest + 1;		/* points to <NL> after <CR> */
		pEnd = strstr( pStart, "\r\n" );/* find next <CR><NL> */

		while (pEnd != NULL)		/* found one? */
		{
		    memmove(pDest, pStart, (long)(pEnd - pStart));
							/* exclude <CR> */
		    pDest += (long)(pEnd - pStart);	/* new destination */
		    pStart = pEnd + 1;			/* new starting point */
		    pEnd = strstr(pStart, "\r\n");	/* find next <CR><NL> */
		}

		/* Fell out of while() loop: no more <CR><NL> pairs.  Just copy
		 * the rest of the data, up to the first null byte.  */
		pEnd = strchr(pStart, '\0');		/* find first null */

		memmove(pDest, pStart, (long)(pEnd - pStart)); /* exclude nul */
		pDest += (long)(pEnd - pStart);
		*pDest = '\0';				    /* terminate */

		/* Now that all <CR><NL> pairs have been "compressed" into just
		 * <NL>'s, determine the true text length.  */
		clip_data_size = (long_u)(pDest - pClipText);
	    }
	    else
	    {
		/* no <CR><NL> pairs at all */
		/* Since the data may have been padded with trailing nulls,
		 * determine the true string length. */
		clip_data_size = STRLEN(pClipText);	/* true data length */
	    }

	    /* Copy the cleaned-up data over to Vim's clipboard "*" register. */
	    clip_yank_selection(type, pClipText, clip_data_size, cbd);

	    /* Free the memory that Win16GetClipboardData() allocated. */
	    vim_free(pAllocated);
	}

	Win16CloseClipboard();

    }  // end if (Win16OpenClipboard())
}

/*
 * Send the currently selected Vim text to the Windows clipboard.
 */
    void
clip_mch_set_selection( VimClipboard *cbd )
{
    char_u	*pClipData = NULL;
    long_u	clip_data_size;
    int		clip_data_type;

    /* If the '*' register isn't already filled in, fill it in now. */
    cbd->owned = TRUE;
    clip_get_selection(cbd);
    cbd->owned = FALSE;

    /*
     * clip_convert_selection() returns a pointer to a buffer containing
     * the text to send to the Windows clipboard, together with a count
     * of the number of characters (bytes) in the buffer.  The function's
     * return value is the 'type' of selection: MLINE, MCHAR, or MBLOCK;
     * or -1 for failure.
     */
    clip_data_type = clip_convert_selection(&pClipData, &clip_data_size, cbd);

    if (clip_data_type < 0)	    /* could not convert? */
	return;			    /* early exit */

    if (Win16OpenClipboard())
    {
	if (Win16EmptyClipboard())
	{
	    int sentOK;

	    sentOK = Win16SetClipboardData(CF_TEXT, pClipData,
					      clip_data_size, clip_data_type);
	    sentOK = Win16SetClipboardData(CF_VIMCLIP,
			 pClipData, clip_data_size, clip_data_type) && sentOK;

	    if (!sentOK)
	    {
		/* one or both of Win16SetClipboardData() failed. */
		/* Technically we don't know why Win16SetClipboardData()
		 * failed, but almost always it will be because there wasn't
		 * enough DOS memory to bufer the data, so report that as the
		 * problem.
		 *
		 * We report the error here (instead of in
		 * Win16SetClipboardData()) because we don't want the error
		 * reported twice.
		 */
		EMSG("E450: Selection too large, cannot allocate DOS buffer");
	    }
	}

	Win16CloseClipboard();
    }

    /* release memory allocated by clip_convert_selection() */
    vim_free(pClipData);

    return;
}

/*
 * Win16OpenClipboard: open the Windows clipboard.  The clipboard must be open
 * before it can be communicated with at all.  Return TRUE on success,
 * FALSE on failure.
 */
    static int
Win16OpenClipboard(void)
{
    __dpmi_regs  dpmi_regs;

    long    start_time;
    int	    tick_count;

    /* int 02xf, AX = 0x1701 attempts to open the Windows clipboard.  Upon
     * return from the interrupt, if AX is non-zero, the clipboard was
     * successfully opened.  If AX is zero, the clipboard could not be opened
     * because it is currently in use by another process.
     *
     * Remark: other DOS programs I (dk) have written that use the Windows
     * clipboard sometimes encounter the problem that the clipboard cannot
     * be opened even though it is demonstrably not in use by any other
     * process.  In all cases, repeated attempts to open the clipboard
     * eventually succeed, but the initial attempt occasionally fails.
     *
     * The problem is intermittent and appears to be related to DOS being
     * "busy" at certain unpredictable times.  DOS maintains two internal
     * flags that indicate whether it's busy: InDOS and CritErr.  The
     * location of InDOS can be found by calling int 0x21, AH = 0x34.  The
     * location of CritErr can be found by calling int 0x21, AX = 0x5d06.
     * If either of these flags is set, DOS is "busy" and cannot be
     * interrupted.  See "Undocumented DOS" by Schulman et al for details.
     *
     * However here I take the easier approach that if the first call to open
     * the clipboard does not succeed, just try again.  In fact, try once per
     * biostime() clock tick, up to 18 times (about one second).
     */

    tick_count = 0;

    dpmi_regs.x.ax = 0x1701;	/* open Windows clipboard */
    if (__dpmi_int(0x2f, &dpmi_regs) == -1)
    {
	/* real-mode interrupt failed? */
	return FALSE;		/* FALSE --> clipboard not open */
    }

    /* wait up to one second */
    while (dpmi_regs.x.ax == 0 && tick_count++ < 18)
    {
	/* Wait one clock tick (18.2 ticks/sec = 55 msec per tick).
	 *
	 * We busy-wait here.  Unfortunately, delay() and usleep() have been
	 * reported to give problems with the original Windows 95.  This is
	 * fixed in service pack 1, but not everybody installed that.
	 */
	start_time = biostime(0, 0L);
	while (biostime(0, 0L) == start_time)
	    ;

	dpmi_regs.x.ax = 0x1701;    /* open Windows clipboard */
	if (__dpmi_int(0x2f, &dpmi_regs) == -1)
	{
	    /* real-mode interrupt failed? */
	    return FALSE;		/* FALSE --> clipboard not open */
	}
    }

    /* Couldn't open the clipboard, even after 18 attempts? */

    if (tick_count >= 18 && dpmi_regs.x.ax == 0)
	return FALSE;		/* FALSE --> clipboard not open */

    return TRUE;	/* TRUE --> clipboard opened successfully, OK */
}

/*
 * Win16CloseClipboard: close the Windows clipboard.  Return TRUE on
 * success, FALSE on failure.  This function can always be called,
 * whether the clipboard is open or not.
 */
    static int
Win16CloseClipboard(void)
{
    __dpmi_regs  dpmi_regs;

    /* Close the clipboard.  This interrupt can always be called, even
     * if the clipboard is already closed.
     */

    dpmi_regs.x.ax = 0x1708;	    /* close the clipboard */
    if (__dpmi_int(0x2f, &dpmi_regs) == -1)
    {
	/* real-mode interrupt failed? */
	return FALSE;		/* FALSE --> clipboard could not be closed */
    }

    return TRUE;	/* TRUE --> clipboard closed successfully, OK */
}

/*
 * Win16EmptyClipboard: empty the (previously opened) Windows clipboard.
 * Return TRUE on success, FALSE on failure.
 */
    static int
Win16EmptyClipboard(void)
{
    __dpmi_regs  dpmi_regs;

    /* int 02xf, AX = 0x1702 attempts to empty the Windows clipboard.  Upon
     * return from the interrupt, if AX == 0, the clipboard could not be
     * emptied (for some reason).
     */
    dpmi_regs.x.ax = 0x1702;    /*  empty the Windows clipboard */
    if (__dpmi_int(0x2f, &dpmi_regs) == -1)
    {
	/* real-mode interrupt failed? */
	return FALSE;		/* FALSE --> clipboard could not be emptied */
    }

    /* Did we succeed in clearing the clipboard? */
    if (dpmi_regs.x.ax == 0)
	return FALSE;		/* FALSE --> clipboard could not be emptied */

    return TRUE;		/* TRUE --> clipboard was emptied, OK */
}

/*
 * FreeDOSMemory: a helper function to free memory previously
 * allocated by a call to __dpmi_allocate_dos_memory().
 */
    static void
FreeDOSMemory(int protected_mode_selector)
{
    /* Free the DOS buffer and release the DPMI prot-mode selector.
     *
     * It's important that DOS memory be properly released because
     * there's only a limited amount of it.  Therefore, if the call
     * to __dpmi_free_dos_memory() fails, emit an error message
     * unconditionally.
     */
    if (__dpmi_free_dos_memory(protected_mode_selector) == -1)
	EMSG("E451: could not free DOS memory buffer (DJGPP)");
}

/*
 * Win16GetClipboardData: query the Windows clipboard as to whether data
 * is available in a particular clipboard format.  If data is
 * available, allocate a buffer for it and read the data from the
 * clipboard into the buffer.  Return a pointer to the buffer.  If
 * no data is available in the requested format, return NULL.
 *
 * This routine allocates memory to hold the retrieved clipboard
 * data.  It's the caller's responsibility to free this memory
 * once it's finished using it.  The memory should be freed by
 * calling vim_free().
 */
    static char_u *
Win16GetClipboardData(int clip_data_format)
{
    __dpmi_regs  dpmi_regs;

    int		real_mode_segment_address;
    int		protected_mode_selector;

    char_u	*clip_data_buffer;
    long_u	clip_data_size;

    /* We only handle clipboard formats we recognize, others are ignored.
     *
     * It's not possible to create a custom clipboard format for VimClipboard
     * data under DOS, so one of the predefined Windows formats had to be
     * used for CF_VIMCLIP.  Two obscure formats, popular when Windows 3.0
     * came out but no longer in much use today, are the DIF and SYLK formats.
     * DIF is the Data Interchange Format, SYLK is the Symbolic Link format.
     * They are both text formats and either one can be hijacked for use as
     * "the VimClipboard format".  Of course, this conflicts with anyone who
     * still *is* using DIF or SYLK data formats, but that will be very few
     * people.
     *
     * I (dk) chose SYLK as the more obscure format because it was used
     * mostly for Microsoft Multiplan (the pre-cursor to Excel) and it's not
     * likely Multiplan is used anywhere much anymore.  Mind you, Excel can
     * still export to both DIF and SYLK formats.
     */

    switch (clip_data_format)
    {
    case CF_VIMCLIP:		    /* Vim's own special clipboard format */
    case CF_TEXT:		    /* Windows text */
    case CF_OEMTEXT:		    /* DOS (OEM) text */

	/* int 02xf, AX = 0x1704 returns the number of bytes of data currently
	 * on the Windows clipboard, for the specified format.  Upon return
	 * from the interrupt, DX:AX = the number of bytes, rounded up to the
	 * nearest multiple of 32.
	 */

	dpmi_regs.x.ax = 0x1704;    /* get size of clipbd data */
	dpmi_regs.x.dx = clip_data_format;
	if (__dpmi_int(0x2f, &dpmi_regs) == -1)
	{
	    /* real-mode interrupt failed? */
	    return NULL;				    /* early exit */
	}

	/* Did we get anything?  If not, this is not an error. */
	if (dpmi_regs.x.dx == 0 && dpmi_regs.x.ax == 0)
	{
	    /* no CF_VIMCLIP data? */
	    return NULL;				    /* early exit */
	}

	/* There is data available in the requested clipboard format.
	 *
	 * Calculate data size.  Remember this is rounded up to the nearest
	 * multiple of 32, so clip_data_size is actually an upper limit.
	 * The extra bytes, if any, are set to null (0x00) when the data is
	 * read from the clipboard.  (Later:) actually I'm no longer sure
	 * this is strictly true: the end-of-data is marked by a null, but
	 * the extra bytes appear to sometimes be null, sometimes not.
	 * They may just be garbage.
	 */
	clip_data_size = dpmi_regs.x.ax + (dpmi_regs.x.dx << 16);

	/* Allocate memory to retrieve the data.  The buffer has to lie in the
	 * DOS memory region (in the first 1 MByte of address space) because
	 * the Windows clipboard interface expects a 16-bit segment:offset
	 * pointer to a buffer address within the DOS region.  Must therefore
	 * use __dpmi_allocate_dos_memory() instead of lalloc() or alloc().
	 */
	real_mode_segment_address = __dpmi_allocate_dos_memory(
		(clip_data_size + 15) >> 4,	/* buffer size, in 16-byte paragraphs */
		&protected_mode_selector);	/* prot-mode selector for the address */

	if (real_mode_segment_address == -1)
	{
	    /* memory allocation failed. */

	    /* Technically we don't know why the allocation failed, but
	     * almost always it will be because there wasn't enough DOS
	     * memory to satisfy the request, so report that as the problem.
	     * On my system, DJGPP is able to satisfy a DOS allocation request
	     * up to about 600K in size.  This depends on your HIMEM.SYS and
	     * EMM386.EXE settings however.
	     */
	    EMSG("E452: Clipboard data too large, cannot allocate DOS buffer");
	    return NULL;				    /* early exit */
	}

	/* Copy data from the clipboard into the buffer.  Experiments show that
	 * the Windows clipboard is smart enough to handle data transfers
	 * larger than 64K properly, even though the buffer address is a 16-bit
	 * segment:offset (which would normally limit the block size to 64K
	 * unless ES gets incremented).
	 */
	dpmi_regs.x.ax = 0x1705;	/* get clipboard data */
	dpmi_regs.x.dx = clip_data_format;		/* CF_VIMCLIP */
	dpmi_regs.x.es = real_mode_segment_address;	/* buffer ad: segment */
	dpmi_regs.x.bx = 0;				/* buffer ad: offset */
	if (__dpmi_int( 0x2f, &dpmi_regs) == -1)
	{
	    /* real-mode interrupt failed? */
	    EMSG("E453: could not copy clipboard data to DOS buffer");
	    FreeDOSMemory(protected_mode_selector);	/* clean up DOS mem */
	    return NULL;				/* early exit */
	}

	/* Clipboard data is now in DOS memory in the buffer pointed to by
	 * ES:BX.  Copy this into ordinary memory that Vim can access (ie.
	 * prot-mode memory).  Allocate one extra byte to ensure the text
	 * is terminated properly (in case it was somehow corrupted).
	 */
	clip_data_buffer = (char_u *)lalloc(clip_data_size + 1, TRUE);

	if (clip_data_buffer == NULL)
	{
	    /* allocation failed? */
	    EMSG("E454: could not allocate clipboard memory buffer");
	    FreeDOSMemory(protected_mode_selector);	/* clean up DOS mem */
	    return NULL;				/* early exit */
	}

	*(clip_data_buffer + clip_data_size) = '\0';	/* ensure terminated */

	/* Copy the data from DOS memory to Vim-accessible memory. */
	movedata(				/* DJGPP version of memcpy() */
		protected_mode_selector, 0, /* source: DOS ad (via selector) */
		_my_ds(), (unsigned)clip_data_buffer,
						/* target: normal mem address */
		clip_data_size);		/* how many bytes */

	/* Free the DOS buffer and release the DPMI prot-mode selector. */
	FreeDOSMemory(protected_mode_selector);	 /* clean up DOS memory */

	return clip_data_buffer;    /* return pointer to allocated buffer */

    default:		/* unknown clipboard format */
	return NULL;
    }
}

/*
 * Win16SetClipboardData: send 'clip_data_size' bytes of data from the buffer
 * pointed to by 'clip_data', to the Windows clipboard.  The data is
 * registered with the clipboard as being in the 'clip_data_format'
 * format.
 */
    static int
Win16SetClipboardData(
	int	clip_data_format,
	char_u	*clip_data,
	int	clip_data_size,
	int	clip_data_type)
{
    __dpmi_regs  dpmi_regs;

    int		real_mode_segment_address;
    int		protected_mode_selector;
    long_u	protected_mode_offset = 0L;
    int		total_size = clip_data_size;

    char_u	*clip_sel_type;

    /* If we're using the CF_VIMCLIP custom format, allocate an extra
     * byte for clip_sel_type, which is a character indicating the type
     * of text selection: MLINE, MCHAR, or MBLOCK.
     */
    if (clip_data_format == CF_VIMCLIP)
	total_size++;			/* extra byte for marker */

    /* Data cannot be sent directly from a Vim string (pClipData) to
     * the Windows clipboard, because the Windows clipboard interface
     * expects a 16-bit (DOS) segment:offset address for the source
     * buffer.  Therefore we must create a "transfer buffer" in the DOS
     * memory region (in the first 1 MByte of address space) and copy
     * the Vim string into that.  From there, the data can then be sent
     * to the Windows clipboard.
     *
     * To allocate DOS memory, we must use __dpmi_allocate_dos_memory()
     * instead of lalloc() or alloc().  If the allocation fails, it will
     * almost invariably be because there is not enough DOS memory
     * available to accommodate the size of clip_data.  There is nothing
     * we can do about this, we simply have to fail.
     */
    real_mode_segment_address = __dpmi_allocate_dos_memory(
	    (total_size + 15) >> 4,	/* buffer size, in 16-byte paragraphs */
	    &protected_mode_selector);	/* prot-mode selector for the address */

    if (real_mode_segment_address == -1)
    {
	/* memory allocation failed. */
	/* Technically we don't know why the allocation failed, but
	 * almost always it will be because there wasn't enough DOS
	 * memory to satisfy the request.  On my system, DJGPP is able
	 * to satisfy a DOS allocation request up to about 600K in size.
	 * This depends however on HIMEM.SYS and EMM386.EXE settings.
	 */
	return FALSE;				/* early exit */
    }

    /* Copy data from Vim's buffer (clip_data) into the DOS transfer buffer.
     * This can be larger than 64K; movedata() takes care of crossing any
     * 16-bit segment boundaries.
     *
     * If we're using Vim's custom clipboard format, we must copy one extra
     * byte to indicate the type of selection: line, character, or block.
     */
    if (clip_data_format == CF_VIMCLIP)
    {
	switch (clip_data_type)
	{
	    default:
	    case MLINE:	    clip_sel_type = "L";	break;
	    case MCHAR:	    clip_sel_type = "C";	break;
#ifdef FEAT_VISUAL
	    case MBLOCK:    clip_sel_type = "B";	break;
#endif
	}

	movedata(
		_my_ds(), (unsigned)clip_sel_type,
					    /* source: normal memory address */
		protected_mode_selector, 0, /* target: DOS ad (via selector) */
		1);			    /* how many bytes to copy */

	protected_mode_offset += STRLEN(clip_sel_type);	/* allow for marker */
    }

    movedata(
	_my_ds(), (unsigned)clip_data,	/* source: normal memory address */
	protected_mode_selector,	/* target: DOS address (via selector) */
	protected_mode_offset,		/* non-zero, if using clip_sel_type */
	clip_data_size);		/* how many bytes to copy */

    /* Send data from the DOS transfer buffer to the Windows clipboard.
     * int 02xf, AX = 0x1703 sends SI:CX bytes of data from the buffer
     * at ES:BX, to the clipboard.
     */
    dpmi_regs.x.ax = 0x1703;			/* send clipboard data */
    dpmi_regs.x.dx = clip_data_format;		/* flag: format of the data */
    dpmi_regs.x.si = ((total_size >> 16)
	    & 0x0000ffffL);			/* hi word of data size */
    dpmi_regs.x.cx = (total_size & 0x0000ffffL);
						/* lo word of data size */
    dpmi_regs.x.es = real_mode_segment_address;	/* buffer address: segment */
    dpmi_regs.x.bx = 0;				/* buffer address: offset */
    if (__dpmi_int(0x2f, &dpmi_regs) == -1)
    {
	/* real-mode interrupt failed. */
	FreeDOSMemory(protected_mode_selector);   /* clean up DOS memory */
	return FALSE;				  /* early exit */
    }

    /* Free the DOS buffer and release the DPMI prot-mode selector. */
    FreeDOSMemory(protected_mode_selector);	  /* clean up DOS memory */

    return TRUE;	/* TRUE --> data successfully sent to clipboard */
}

#endif	/* FEAT_CLIPBOARD */
#endif /* DJGPP */

/*
 * End of MS-DOS only code
 */
#endif /* WIN16 */

/* common MS-DOS and Win16 code follows */

    static int
vim_chmod(char_u *name)
{
    char_u	*p;
    int		f;
    int		c = 0;

    /* chmod() can't handle a file name with a trailing slash, remove it.
     * But don't remove it for "/" or "c:/". */
    p = name + STRLEN(name);
    if (p > name)
	--p;
    if (p > name && (*p == '\\' || *p == '/') && p[-1] != ':')
    {
	c = *p;				/* remove trailing (back)slash */
	*p = NUL;
    }
    else
	p = NULL;
#if defined(__BORLANDC__) && (__BORLANDC__ > 0x410)
    /* this also sets the archive bit, supported by Borland C 4.0 and later,
     * where __BORLANDC__ is 0x450 (3.1 is 0x410) */
    f = _rtl_chmod((char *)name, 0, 0);
#else
    f = _chmod((char *)name, 0, 0);
#endif
    if (p != NULL)
	*p = c;				/* put back (back)slash */
    return f;
}

/*
 * get file permissions for 'name'
 * Returns -1 for error.
 * Returns FA_attributes defined in dos.h
 */
    long
mch_getperm(char_u *name)
{
    return (long)vim_chmod(name);	/* get file mode */
}

/*
 * set file permission for 'name' to 'perm'
 *
 * return FAIL for failure, OK otherwise
 */
    int
mch_setperm(
    char_u	*name,
    long	perm)
{
    perm |= FA_ARCH;	    /* file has changed, set archive bit */
#if defined(__BORLANDC__) && (__BORLANDC__ > 0x410)
    return (_rtl_chmod((char *)name, 1, (int)perm) == -1 ? FAIL : OK);
#else
    return (_chmod((char *)name, 1, (int)perm) == -1 ? FAIL : OK);
#endif
}

/*
 * Set hidden flag for "name".
 */
    void
mch_hide(char_u *name)
{
    /* DOS 6.2 share.exe causes "seek error on file write" errors when making
     * the swap file hidden.  Thus don't do it. */
}

/*
 * return TRUE if "name" is a directory
 * return FALSE if "name" is not a directory
 * return FALSE for error
 *
 * beware of a trailing (back)slash
 */
    int
mch_isdir(char_u *name)
{
    int		f;

    f = vim_chmod(name);
    if (f == -1)
	return FALSE;		    /* file does not exist at all */
    if ((f & FA_DIREC) == 0)
	return FALSE;		    /* not a directory */
    return TRUE;
}

/*
 * Return 1 if "name" can be executed, 0 if not.
 * Return -1 if unknown.
 */
    int
mch_can_exe(name)
    char_u	*name;
{
    char	*p;

    p = searchpath(name);
    if (p == NULL || mch_isdir(p))
	return FALSE;
    return TRUE;
}

/*
 * Check what "name" is:
 * NODE_NORMAL: file or directory (or doesn't exist)
 * NODE_WRITABLE: writable device, socket, fifo, etc.
 * NODE_OTHER: non-writable things
 */
    int
mch_nodetype(char_u *name)
{
    if (STRICMP(name, "AUX") == 0
	    || STRICMP(name, "CON") == 0
	    || STRICMP(name, "CLOCK$") == 0
	    || STRICMP(name, "NUL") == 0
	    || STRICMP(name, "PRN") == 0
	    || ((STRNICMP(name, "COM", 3) == 0
		    || STRNICMP(name, "LPT", 3) == 0)
		&& VIM_ISDIGIT(name[3])
		&& name[4] == NUL))
	return NODE_WRITABLE;
    /* TODO: NODE_OTHER? */
    return NODE_NORMAL;
}

/*
 * Get name of current directory into buffer 'buf' of length 'len' bytes.
 * Return OK for success, FAIL for failure.
 */
    int
mch_dirname(
    char_u	*buf,
    int		len)
{
#ifdef DJGPP
    if (getcwd((char *)buf, len) == NULL)
	return FAIL;
    /* turn the '/'s returned by DJGPP into '\'s */
    slash_adjust(buf);
    return OK;
#else
    return (getcwd((char *)buf, len) != NULL ? OK : FAIL);
#endif
}

/*
 * this version of remove is not scared by a readonly (backup) file
 *
 * returns -1 on error, 0 otherwise (just like remove())
 */
    int
mch_remove(char_u *name)
{
    (void)mch_setperm(name, 0);    /* default permissions */
    return unlink((char *)name);
}

/*
 * Special version of getenv(): Use uppercase name.
 */
    char_u *
mch_getenv(char_u *name)
{
    int		i;
#define MAXENVLEN 50
    char_u	var_copy[MAXENVLEN + 1];
    char_u	*p;
    char_u	*res;

    /*
     * Take a copy of the argument, and force it to upper case before passing
     * to getenv().  On DOS systems, getenv() doesn't like lower-case argument
     * (unlike Win32 et al.)  If the name is too long to fit in var_copy[]
     * allocate memory.
     */
    if ((i = STRLEN(name)) > MAXENVLEN)
	p = alloc(i + 1);
    else
	p = var_copy;
    if (p == NULL)
	p = name;   /* out of memory, fall back to unmodified name */
    else
    {
	for (i = 0; name[i] != NUL; ++i)
	    p[i] = toupper(name[i]);
	p[i] = NUL;
    }

    res = (char_u *)getenv((char *)p);

    if (p != var_copy && p != name)
	vim_free(p);

    return res;
}

/*
 * Insert user name in s[len].
 */
    int
mch_get_user_name(
    char_u	*s,
    int		len)
{
    *s = NUL;
    return FAIL;
}

/*
 * Insert host name is s[len].
 */
    void
mch_get_host_name(
    char_u	*s,
    int		len)
{
#ifdef DJGPP
    vim_strncpy(s, "PC (32 bits Vim)", len - 1);
#else
    vim_strncpy(s, "PC (16 bits Vim)", len - 1);
#endif
}