source: vendor/bash/3.1/lib/termcap/tparam.c

Last change on this file was 3228, checked in by bird, 18 years ago

bash 3.1
File size: 7.6 KB
Line 
1/* Merge parameters into a termcap entry string.
2 Copyright (C) 1985, 87, 93, 95 Free Software Foundation, Inc.
3
4This program is free software; you can redistribute it and/or modify
5it under the terms of the GNU General Public License as published by
6the Free Software Foundation; either version 2, or (at your option)
7any later version.
8
9This program is distributed in the hope that it will be useful,
10but WITHOUT ANY WARRANTY; without even the implied warranty of
11MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12GNU General Public License for more details.
13
14You should have received a copy of the GNU General Public License
15along with this program; see the file COPYING. If not, write to the
16Free Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
17
18/* Emacs config.h may rename various library functions such as malloc. */
19#ifdef HAVE_CONFIG_H
20#include <config.h>
21
22#ifdef HAVE_STDLIB_H
23# include <stdlib.h>
24#else
25extern char *getenv ();
26extern char *malloc ();
27extern char *realloc ();
28#endif
29
30#else /* not HAVE_CONFIG_H */
31
32#if defined(HAVE_STRING_H) || defined(STDC_HEADERS)
33#define bcopy(s, d, n) memcpy ((d), (s), (n))
34#endif
35
36#ifdef STDC_HEADERS
37#include <stdlib.h>
38#include <string.h>
39#else
40char *malloc ();
41char *realloc ();
42#endif
43
44#endif /* not HAVE_CONFIG_H */
45
46#include "ltcap.h"
47
48#ifndef NULL
49#define NULL (char *) 0
50#endif
51
52
53#ifndef emacs
54static void
55memory_out ()
56{
57 write (2, "virtual memory exhausted\n", 25);
58 exit (1);
59}
60
61static char *
62xmalloc (size)
63 unsigned size;
64{
65 register char *tem = malloc (size);
66
67 if (!tem)
68 memory_out ();
69 return tem;
70}
71
72static char *
73xrealloc (ptr, size)
74 char *ptr;
75 unsigned size;
76{
77 register char *tem = realloc (ptr, size);
78
79 if (!tem)
80 memory_out ();
81 return tem;
82}
83#endif /* not emacs */
84
85
86/* Assuming STRING is the value of a termcap string entry
87 containing `%' constructs to expand parameters,
88 merge in parameter values and store result in block OUTSTRING points to.
89 LEN is the length of OUTSTRING. If more space is needed,
90 a block is allocated with `malloc'.
91
92 The value returned is the address of the resulting string.
93 This may be OUTSTRING or may be the address of a block got with `malloc'.
94 In the latter case, the caller must free the block.
95
96 The fourth and following args to tparam serve as the parameter values. */
97
98static char *tparam1 ();
99
100/* VARARGS 2 */
101char *
102tparam (string, outstring, len, arg0, arg1, arg2, arg3)
103 char *string;
104 char *outstring;
105 int len;
106 int arg0, arg1, arg2, arg3;
107{
108 int arg[4];
109
110 arg[0] = arg0;
111 arg[1] = arg1;
112 arg[2] = arg2;
113 arg[3] = arg3;
114 return tparam1 (string, outstring, len, NULL, NULL, arg);
115}
116
117__private_extern__ char *BC;
118__private_extern__ char *UP;
119
120static char tgoto_buf[50];
121
122__private_extern__
123char *
124tgoto (cm, hpos, vpos)
125 char *cm;
126 int hpos, vpos;
127{
128 int args[2];
129 if (!cm)
130 return NULL;
131 args[0] = vpos;
132 args[1] = hpos;
133 return tparam1 (cm, tgoto_buf, 50, UP, BC, args);
134}
135
136static char *
137tparam1 (string, outstring, len, up, left, argp)
138 char *string;
139 char *outstring;
140 int len;
141 char *up, *left;
142 register int *argp;
143{
144 register int c;
145 register char *p = string;
146 register char *op = outstring;
147 char *outend;
148 int outlen = 0;
149
150 register int tem;
151 int *old_argp = argp;
152 int doleft = 0;
153 int doup = 0;
154
155 outend = outstring + len;
156
157 while (1)
158 {
159 /* If the buffer might be too short, make it bigger. */
160 if (op + 5 >= outend)
161 {
162 register char *new;
163 if (outlen == 0)
164 {
165 outlen = len + 40;
166 new = (char *) xmalloc (outlen);
167 outend += 40;
168 bcopy (outstring, new, op - outstring);
169 }
170 else
171 {
172 outend += outlen;
173 outlen *= 2;
174 new = (char *) xrealloc (outstring, outlen);
175 }
176 op += new - outstring;
177 outend += new - outstring;
178 outstring = new;
179 }
180 c = *p++;
181 if (!c)
182 break;
183 if (c == '%')
184 {
185 c = *p++;
186 tem = *argp;
187 switch (c)
188 {
189 case 'd': /* %d means output in decimal. */
190 if (tem < 10)
191 goto onedigit;
192 if (tem < 100)
193 goto twodigit;
194 case '3': /* %3 means output in decimal, 3 digits. */
195 if (tem > 999)
196 {
197 *op++ = tem / 1000 + '0';
198 tem %= 1000;
199 }
200 *op++ = tem / 100 + '0';
201 case '2': /* %2 means output in decimal, 2 digits. */
202 twodigit:
203 tem %= 100;
204 *op++ = tem / 10 + '0';
205 onedigit:
206 *op++ = tem % 10 + '0';
207 argp++;
208 break;
209
210 case 'C':
211 /* For c-100: print quotient of value by 96, if nonzero,
212 then do like %+. */
213 if (tem >= 96)
214 {
215 *op++ = tem / 96;
216 tem %= 96;
217 }
218 case '+': /* %+x means add character code of char x. */
219 tem += *p++;
220 case '.': /* %. means output as character. */
221 if (left)
222 {
223 /* If want to forbid output of 0 and \n and \t,
224 and this is one of them, increment it. */
225 while (tem == 0 || tem == '\n' || tem == '\t')
226 {
227 tem++;
228 if (argp == old_argp)
229 doup++, outend -= strlen (up);
230 else
231 doleft++, outend -= strlen (left);
232 }
233 }
234 *op++ = tem ? tem : 0200;
235 case 'f': /* %f means discard next arg. */
236 argp++;
237 break;
238
239 case 'b': /* %b means back up one arg (and re-use it). */
240 argp--;
241 break;
242
243 case 'r': /* %r means interchange following two args. */
244 argp[0] = argp[1];
245 argp[1] = tem;
246 old_argp++;
247 break;
248
249 case '>': /* %>xy means if arg is > char code of x, */
250 if (argp[0] > *p++) /* then add char code of y to the arg, */
251 argp[0] += *p; /* and in any case don't output. */
252 p++; /* Leave the arg to be output later. */
253 break;
254
255 case 'a': /* %a means arithmetic. */
256 /* Next character says what operation.
257 Add or subtract either a constant or some other arg. */
258 /* First following character is + to add or - to subtract
259 or = to assign. */
260 /* Next following char is 'p' and an arg spec
261 (0100 plus position of that arg relative to this one)
262 or 'c' and a constant stored in a character. */
263 tem = p[2] & 0177;
264 if (p[1] == 'p')
265 tem = argp[tem - 0100];
266 if (p[0] == '-')
267 argp[0] -= tem;
268 else if (p[0] == '+')
269 argp[0] += tem;
270 else if (p[0] == '*')
271 argp[0] *= tem;
272 else if (p[0] == '/')
273 argp[0] /= tem;
274 else
275 argp[0] = tem;
276
277 p += 3;
278 break;
279
280 case 'i': /* %i means add one to arg, */
281 argp[0] ++; /* and leave it to be output later. */
282 argp[1] ++; /* Increment the following arg, too! */
283 break;
284
285 case '%': /* %% means output %; no arg. */
286 goto ordinary;
287
288 case 'n': /* %n means xor each of next two args with 140. */
289 argp[0] ^= 0140;
290 argp[1] ^= 0140;
291 break;
292
293 case 'm': /* %m means xor each of next two args with 177. */
294 argp[0] ^= 0177;
295 argp[1] ^= 0177;
296 break;
297
298 case 'B': /* %B means express arg as BCD char code. */
299 argp[0] += 6 * (tem / 10);
300 break;
301
302 case 'D': /* %D means weird Delta Data transformation. */
303 argp[0] -= 2 * (tem % 16);
304 break;
305 }
306 }
307 else
308 /* Ordinary character in the argument string. */
309 ordinary:
310 *op++ = c;
311 }
312 *op = 0;
313 while (doup-- > 0)
314 strcat (op, up);
315 while (doleft-- > 0)
316 strcat (op, left);
317 return outstring;
318}
319
320
321#ifdef DEBUG
322
323main (argc, argv)
324 int argc;
325 char **argv;
326{
327 char buf[50];
328 int args[3];
329 args[0] = atoi (argv[2]);
330 args[1] = atoi (argv[3]);
331 args[2] = atoi (argv[4]);
332 tparam1 (argv[1], buf, "LEFT", "UP", args);
333 printf ("%s\n", buf);
334 return 0;
335}
336
337#endif /* DEBUG */
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