summaryrefslogtreecommitdiff
path: root/src/termlib.c
blob: a0036c64b725224527ee70cf65407e50ee0e0491 (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
/* vi:set ts=8 sts=4 sw=4: */
/*
 * The following software is (C) 1984 Peter da Silva, the Mad Australian, in
 * the public domain. It may be re-distributed for any purpose with the
 * inclusion of this notice.
 */

/* Modified by Bram Moolenaar for use with VIM - Vi Improved. */
/* A few bugs removed by Olaf 'Rhialto' Seibert. */

/* TERMLIB: Terminal independant database. */

#include "vim.h"
#include "termlib.pro"

#if !defined(AMIGA) && !defined(VMS) && !defined(MACOS) && !defined(RISCOS)
# include <sgtty.h>
#endif

static int  getent __ARGS((char *, char *, FILE *, int));
static int  nextent __ARGS((char *, FILE *, int));
static int  _match __ARGS((char *, char *));
static char *_addfmt __ARGS((char *, char *, int));
static char *_find __ARGS((char *, char *));

/*
 * Global variables for termlib
 */

char	*tent;		      /* Pointer to terminal entry, set by tgetent */
char	PC = 0;		      /* Pad character, default NULL */
char	*UP = 0, *BC = 0;     /* Pointers to UP and BC strings from database */
short	ospeed;		      /* Baud rate (1-16, 1=300, 16=19200), as in stty */

/*
 * Module: tgetent
 *
 * Purpose: Get termcap entry for <term> into buffer at <tbuf>.
 *
 * Calling conventions: char tbuf[TBUFSZ+], term=canonical name for terminal.
 *
 * Returned values: 1 = success, -1 = can't open file,
 *	    0 = can't find terminal.
 *
 * Notes:
 * - Should probably supply static buffer.
 * - Uses environment variables "TERM" and "TERMCAP". If TERM = term (that is,
 *   if the argument matches the environment) then it looks at TERMCAP.
 * - If TERMCAP begins with a slash, then it assumes this is the file to
 *   search rather than /etc/termcap.
 * - If TERMCAP does not begin with a slash, and it matches TERM, then this is
 *   used as the entry.
 * - This could be simplified considerably for non-UNIX systems.
 */

#ifndef TERMCAPFILE
# ifdef AMIGA
#  define TERMCAPFILE "s:termcap"
# else
#  ifdef VMS
#   define TERMCAPFILE "VIMRUNTIME:termcap"
#  else
#   define TERMCAPFILE "/etc/termcap"
#  endif
# endif
#endif

    int
tgetent(tbuf, term)
    char    *tbuf;		/* Buffer to hold termcap entry, TBUFSZ bytes max */
    char    *term;		/* Name of terminal */
{
    char    tcbuf[32];		/* Temp buffer to handle */
    char    *tcptr = tcbuf;	/* extended entries */
    char    *tcap = TERMCAPFILE; /* Default termcap file */
    char    *tmp;
    FILE    *termcap;
    int	    retval = 0;
    int	    len;

    if ((tmp = (char *)mch_getenv((char_u *)"TERMCAP")) != NULL)
    {
	if (*tmp == '/')		/* TERMCAP = name of termcap file */
	{
	    tcap = tmp ;
#if defined(AMIGA)
	    /* Convert /usr/share/lib/termcap to usr:share/lib/termcap */
	    tcap++;
	    tmp = strchr(tcap, '/');
	    if (tmp)
		*tmp = ':';
#endif
	}
	else				/* TERMCAP = termcap entry itself */
	{
	    int tlen = strlen(term);

	    while (*tmp && *tmp != ':')		/* Check if TERM matches */
	    {
		char *nexttmp;

		while (*tmp == '|')
		    tmp++;
		nexttmp  = _find(tmp, ":|");	/* Rhialto */
		if (tmp+tlen == nexttmp && _match(tmp, term) == tlen)
		{
		    strcpy(tbuf, tmp);
		    tent = tbuf;
		    return 1;
		}
		else
		    tmp = nexttmp;
	    }
	}
    }
    if (!(termcap = mch_fopen(tcap, "r")))
    {
	strcpy(tbuf, tcap);
	return -1;
    }

    len = 0;
    while (getent(tbuf + len, term, termcap, TBUFSZ - len))
    {
	tcptr = tcbuf;				/* Rhialto */
	if ((term = tgetstr("tc", &tcptr)))	/* extended entry */
	{
	    rewind(termcap);
	    len = strlen(tbuf);
	}
	else
	{
	    retval = 1;
	    tent = tbuf;	/* reset it back to the beginning */
	    break;
	}
    }
    fclose(termcap);
    return retval;
}

    static int
getent(tbuf, term, termcap, buflen)
    char    *tbuf, *term;
    FILE    *termcap;
    int	    buflen;
{
    char    *tptr;
    int	    tlen = strlen(term);

    while (nextent(tbuf, termcap, buflen))	/* For each possible entry */
    {
	tptr = tbuf;
	while (*tptr && *tptr != ':')		/* : terminates name field */
	{
	    char    *nexttptr;

	    while (*tptr == '|')		/* | seperates names */
		tptr++;
	    nexttptr = _find(tptr, ":|");	/* Rhialto */
	    if (tptr + tlen == nexttptr &&
		_match(tptr, term) == tlen)	/* FOUND! */
	    {
		tent = tbuf;
		return 1;
	    }
	    else				/* Look for next name */
		tptr = nexttptr;
	}
    }
    return 0;
}

    static int
nextent(tbuf, termcap, buflen)		/* Read 1 entry from TERMCAP file */
    char    *tbuf;
    FILE    *termcap;
    int	    buflen;
{
    char *lbuf = tbuf;				/* lbuf=line buffer */
				/* read lines straight into buffer */

    while (lbuf < tbuf+buflen &&		/* There's room and */
	  fgets(lbuf, (int)(tbuf+buflen-lbuf), termcap)) /* another line */
    {
	int llen = strlen(lbuf);

	if (*lbuf == '#')			/* eat comments */
	    continue;
	if (lbuf[-1] == ':' &&			/* and whitespace */
	    lbuf[0] == '\t' &&
	    lbuf[1] == ':')
	{
	    strcpy(lbuf, lbuf+2);
	    llen -= 2;
	}
	if (lbuf[llen-2] == '\\')		/* and continuations */
	    lbuf += llen-2;
	else
	{
	    lbuf[llen-1]=0;			/* no continuation, return */
	    return 1;
	}
    }

    return 0;					/* ran into end of file */
}

/*
 * Module: tgetflag
 *
 * Purpose: returns flag true or false as to the existence of a given entry.
 * used with 'bs', 'am', etc...
 *
 * Calling conventions: id is the 2 character capability id.
 *
 * Returned values: 1 for success, 0 for failure.
 */

    int
tgetflag(id)
    char *id;
{
    char    buf[256], *ptr = buf;

    return tgetstr(id, &ptr) ? 1 : 0;
}

/*
 * Module: tgetnum
 *
 * Purpose: get numeric value such as 'li' or 'co' from termcap.
 *
 * Calling conventions: id = 2 character id.
 *
 * Returned values: -1 for failure, else numerical value.
 */

    int
tgetnum(id)
    char *id;
{
    char *ptr, buf[256];
    ptr = buf;

    if (tgetstr(id, &ptr))
	return atoi(buf);
    else
	return 0;
}

/*
 * Module: tgetstr
 *
 * Purpose: get terminal capability string from database.
 *
 * Calling conventions: id is the two character capability id.
 *	    (*buf) points into a hold buffer for the
 *	    id. the capability is copied into the buffer
 *	    and (*buf) is advanced to point to the next
 *	    free byte in the buffer.
 *
 * Returned values: 0 = no such entry, otherwise returns original
 *	    (*buf) (now a pointer to the string).
 *
 * Notes
 *	It also decodes certain escape sequences in the buffer.
 *  they should be obvious from the code:
 *	\E = escape.
 *	\n, \r, \t, \f, \b match the 'c' escapes.
 *	^x matches control-x (^@...^_).
 *	\nnn matches nnn octal.
 *	\x, where x is anything else, matches x. I differ
 *  from the standard library here, in that I allow ^: to match
 *  :.
 *
 */

    char *
tgetstr(id, buf)
    char	*id, **buf;
{
    int		len = strlen(id);
    char	*tmp=tent;
    char	*hold;
    int		i;

    do {
	tmp = _find(tmp, ":");			/* For each field */
	while (*tmp == ':')			/* skip empty fields */
	    tmp++;
	if (!*tmp)
	    break;

	if (_match(id, tmp) == len) {
	    tmp += len;				/* find '=' '@' or '#' */
	    if (*tmp == '@')			/* :xx@: entry for tc */
		return 0;			/* deleted entry */
	    hold= *buf;
	    while (*++tmp && *tmp != ':') {	/* not at end of field */
		switch(*tmp) {
		case '\\':			/* Expand escapes here */
		    switch(*++tmp) {
		    case 0:			/* ignore backslashes */
			tmp--;			/* at end of entry */
			break;			/* shouldn't happen */
		    case 'e':
		    case 'E':			/* ESC */
			*(*buf)++ = ESC;
			break;
		    case 'n':			/* \n */
			*(*buf)++ = '\n';
			break;
		    case 'r':			/* \r */
			*(*buf)++ = '\r';
			break;
		    case 't':			/* \t */
			*(*buf)++ = '\t';
			break;
		    case 'b':			/* \b */
			*(*buf)++ = '\b';
			break;
		    case 'f':			/* \f */
			*(*buf)++ = '\f';
			break;
		    case '0':			/* \nnn */
		    case '1':
		    case '2':
		    case '3':
		    case '4':
		    case '5':
		    case '6':
		    case '7':
		    case '8':
		    case '9':
			**buf = 0;
			    /* get up to three digits */
			for (i = 0; i < 3 && VIM_ISDIGIT(*tmp); ++i)
			    **buf = **buf * 8 + *tmp++ - '0';
			(*buf)++;
			tmp--;
			break;
		    default:			/* \x, for all other x */
			*(*buf)++= *tmp;
		    }
		    break;
		case '^':			/* control characters */
		    ++tmp;
		    *(*buf)++ = Ctrl_chr(*tmp);
		    break;
		default:
		    *(*buf)++ = *tmp;
		}
	    }
	    *(*buf)++ = 0;
	    return hold;
	}
    } while (*tmp);

    return 0;
}

/*
 * Module: tgoto
 *
 * Purpose: decode cm cursor motion string.
 *
 * Calling conventions: cm is cursor motion string.  line, col, are the
 * desired destination.
 *
 * Returned values: a string pointing to the decoded string, or "OOPS" if it
 * cannot be decoded.
 *
 * Notes
 *	The accepted escapes are:
 *	%d	 as in printf, 0 origin.
 *	%2, %3   like %02d, %03d in printf.
 *	%.	 like %c
 *	%+x	 adds <x> to value, then %.
 *	%>xy     if value>x, adds y. No output.
 *	%i	 increments line& col, no output.
 *	%r	 reverses order of line&col. No output.
 *	%%	 prints as a single %.
 *	%n	 exclusive or row & col with 0140.
 *	%B	 BCD, no output.
 *	%D	 reverse coding (x-2*(x%16)), no output.
 */

    char *
tgoto(cm, col, line)
    char	*cm;				/* cm string, from termcap */
    int col,					/* column, x position */
    line;					/* line, y position */
{
    char    gx, gy,				/* x, y */
	*ptr,					/* pointer in 'cm' */
	reverse = 0,				/* reverse flag */
	*bufp,					/* pointer in returned string */
	addup = 0,				/* add upline */
	addbak = 0,				/* add backup */
	c;
    static char buffer[32];

    if (!cm)
	return "OOPS";				/* Kludge, but standard */

    bufp = buffer;
    ptr = cm;

    while (*ptr) {
	if ((c = *ptr++) != '%') {		/* normal char */
	    *bufp++ = c;
	} else {				/* % escape */
	    switch(c = *ptr++) {
	    case 'd':				/* decimal */
		bufp = _addfmt(bufp, "%d", line);
		line = col;
		break;
	    case '2':				/* 2 digit decimal */
		bufp = _addfmt(bufp, "%02d", line);
		line = col;
		break;
	    case '3':				/* 3 digit decimal */
		bufp = _addfmt(bufp, "%03d", line);
		line = col;
		break;
	    case '>':				/* %>xy: if >x, add y */
		gx = *ptr++;
		gy = *ptr++;
		if (col>gx) col += gy;
		if (line>gx) line += gy;
		break;
	    case '+':				/* %+c: add c */
		line += *ptr++;
	    case '.':				/* print x/y */
		if (line == '\t' ||		/* these are */
		   line == '\n' ||		/* chars that */
		   line == '\004' ||		/* UNIX hates */
		   line == '\0') {
		    line++;			/* so go to next pos */
		    if (reverse == (line == col))
			addup=1;		/* and mark UP */
		    else
			addbak=1;		/* or BC */
		}
		*bufp++=line;
		line = col;
		break;
	    case 'r':				/* r: reverse */
		gx = line;
		line = col;
		col = gx;
		reverse = 1;
		break;
	    case 'i':			/* increment (1-origin screen) */
		col++;
		line++;
		break;
	    case '%':				/* %%=% literally */
		*bufp++='%';
		break;
	    case 'n':				/* magic DM2500 code */
		line ^= 0140;
		col ^= 0140;
		break;
	    case 'B':				/* bcd encoding */
		line = line/10<<4+line%10;
		col = col/10<<4+col%10;
		break;
	    case 'D':				/* magic Delta Data code */
		line = line-2*(line&15);
		col = col-2*(col&15);
		break;
	    default:				/* Unknown escape */
		return "OOPS";
	    }
	}
    }

    if (addup)					/* add upline */
	if (UP) {
	    ptr=UP;
	    while (VIM_ISDIGIT(*ptr) || *ptr == '.')
		ptr++;
	    if (*ptr == '*')
		ptr++;
	    while (*ptr)
		*bufp++ = *ptr++;
	}

    if (addbak)					/* add backspace */
	if (BC) {
	    ptr=BC;
	    while (VIM_ISDIGIT(*ptr) || *ptr == '.')
		ptr++;
	    if (*ptr == '*')
		ptr++;
	    while (*ptr)
		*bufp++ = *ptr++;
	}
	else
	    *bufp++='\b';

    *bufp = 0;

    return(buffer);
}

/*
 * Module: tputs
 *
 * Purpose: decode padding information
 *
 * Calling conventions: cp = string to be padded, affcnt = # of items affected
 *	(lines, characters, whatever), outc = routine to output 1 character.
 *
 * Returned values: none
 *
 * Notes
 *	cp has padding information ahead of it, in the form
 *  nnnTEXT or nnn*TEXT. nnn is the number of milliseconds to delay,
 *  and may be a decimal (nnn.mmm). If the asterisk is given, then
 *  the delay is multiplied by afcnt. The delay is produced by outputting
 *  a number of nulls (or other padding char) after printing the
 *  TEXT.
 *
 */

long _bauds[16]={
    0,	50, 75,	110,
    134,    150,    200,    300,
    600,    1200,   1800,   2400,
    4800,   9600,   19200,  19200 };

    int
tputs(cp, affcnt, outc)
    char *cp;				/* string to print */
    int affcnt;				/* Number of lines affected */
    void (*outc) __ARGS((unsigned int));/* routine to output 1 character */
{
    long    frac,			/* 10^(#digits after decimal point) */
	counter,			/* digits */
	atol __ARGS((const char *));

    if (VIM_ISDIGIT(*cp)) {
	counter = 0;
	frac = 1000;
	while (VIM_ISDIGIT(*cp))
	    counter = counter * 10L + (long)(*cp++ - '0');
	if (*cp == '.')
	    while (VIM_ISDIGIT(*++cp)) {
		counter = counter * 10L + (long)(*cp++ - '0');
		frac = frac * 10;
	    }
	if (*cp!='*') {			/* multiply by affected lines */
	    if (affcnt>1) affcnt = 1;
	}
	else
	    cp++;

	/* Calculate number of characters for padding counter/frac ms delay */
	if (ospeed)
	    counter = (counter * _bauds[ospeed] * (long)affcnt) / frac;

	while (*cp)			/* output string */
	    (*outc)(*cp++);
	if (ospeed)
	    while (counter--)		/* followed by pad characters */
		(*outc)(PC);
    }
    else
	while (*cp)
	    (*outc)(*cp++);
    return 0;
}

/*
 * Module: tutil.c
 *
 * Purpose: Utility routines for TERMLIB functions.
 *
 */
    static int
_match(s1, s2)		/* returns length of text common to s1 and s2 */
    char *s1, *s2;
{
    int i = 0;

    while (s1[i] && s1[i] == s2[i])
	i++;

    return i;
}

/*
 * finds next c in s that's a member of set, returns pointer
 */
    static char *
_find(s, set)
    char *s, *set;
{
    for(; *s; s++)
    {
	char	*ptr = set;

	while (*ptr && *s != *ptr)
	    ptr++;

	if (*ptr)
	    return s;
    }

    return s;
}

/*
 * add val to buf according to format fmt
 */
    static char *
_addfmt(buf, fmt, val)
    char *buf, *fmt;
    int val;
{
    sprintf(buf, fmt, val);
    while (*buf)
	buf++;
    return buf;
}