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[emacs.git] / src / tparam.c
blobea20869216143b8b507033a13764245e0509ba0c
1 /* Merge parameters into a termcap entry string.
2 Copyright (C) 1985, 87, 93, 95, 2000 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
7 any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; see the file COPYING. If not, write to
16 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 Boston, MA 02111-1307, USA. */
19 /* Emacs config.h may rename various library functions such as malloc. */
20 #ifdef HAVE_CONFIG_H
21 #include <config.h>
22 #endif
24 #ifdef emacs
25 #include "lisp.h" /* for xmalloc */
26 #else
28 #ifdef STDC_HEADERS
29 #include <stdlib.h>
30 #include <string.h>
31 #else
32 char *malloc ();
33 char *realloc ();
34 #endif
36 /* Do this after the include, in case string.h prototypes bcopy. */
37 #if (defined(HAVE_STRING_H) || defined(STDC_HEADERS)) && !defined(bcopy)
38 #define bcopy(s, d, n) memcpy ((d), (s), (n))
39 #endif
41 #endif /* not emacs */
43 #ifndef NULL
44 #define NULL (char *) 0
45 #endif
47 #ifndef emacs
48 static void
49 memory_out ()
51 write (2, "virtual memory exhausted\n", 25);
52 exit (1);
55 static char *
56 xmalloc (size)
57 unsigned size;
59 register char *tem = malloc (size);
61 if (!tem)
62 memory_out ();
63 return tem;
66 static char *
67 xrealloc (ptr, size)
68 char *ptr;
69 unsigned size;
71 register char *tem = realloc (ptr, size);
73 if (!tem)
74 memory_out ();
75 return tem;
77 #endif /* not emacs */
79 /* Assuming STRING is the value of a termcap string entry
80 containing `%' constructs to expand parameters,
81 merge in parameter values and store result in block OUTSTRING points to.
82 LEN is the length of OUTSTRING. If more space is needed,
83 a block is allocated with `malloc'.
85 The value returned is the address of the resulting string.
86 This may be OUTSTRING or may be the address of a block got with `malloc'.
87 In the latter case, the caller must free the block.
89 The fourth and following args to tparam serve as the parameter values. */
91 static char *tparam1 ();
93 /* VARARGS 2 */
94 char *
95 tparam (string, outstring, len, arg0, arg1, arg2, arg3)
96 char *string;
97 char *outstring;
98 int len;
99 int arg0, arg1, arg2, arg3;
101 int arg[4];
103 arg[0] = arg0;
104 arg[1] = arg1;
105 arg[2] = arg2;
106 arg[3] = arg3;
107 return tparam1 (string, outstring, len, NULL, NULL, arg);
110 /* These are already defined in the System framework in Mac OS X and
111 cause prebinding to fail. */
112 #ifndef MAC_OSX
113 char *BC;
114 char *UP;
116 static char tgoto_buf[50];
118 char *
119 tgoto (cm, hpos, vpos)
120 char *cm;
121 int hpos, vpos;
123 int args[2];
124 if (!cm)
125 return NULL;
126 args[0] = vpos;
127 args[1] = hpos;
128 return tparam1 (cm, tgoto_buf, 50, UP, BC, args);
130 #endif
132 static char *
133 tparam1 (string, outstring, len, up, left, argp)
134 char *string;
135 char *outstring;
136 int len;
137 char *up, *left;
138 register int *argp;
140 register int c;
141 register char *p = string;
142 register char *op = outstring;
143 char *outend;
144 int outlen = 0;
146 register int tem;
147 int *old_argp = argp; /* can move */
148 int *fixed_argp = argp; /* never moves */
149 int explicit_param_p = 0; /* set by %p */
150 int doleft = 0;
151 int doup = 0;
153 outend = outstring + len;
155 while (1)
157 /* If the buffer might be too short, make it bigger. */
158 if (op + 5 >= outend)
160 register char *new;
161 int offset = op - outstring;
163 if (outlen == 0)
165 outlen = len + 40;
166 new = (char *) xmalloc (outlen);
167 bcopy (outstring, new, offset);
169 else
171 outlen *= 2;
172 new = (char *) xrealloc (outstring, outlen);
175 op = new + offset;
176 outend = new + outlen;
177 outstring = new;
179 c = *p++;
180 if (!c)
181 break;
182 if (c == '%')
184 c = *p++;
185 if (explicit_param_p)
186 explicit_param_p = 0;
187 else
188 tem = *argp;
189 switch (c)
191 case 'd': /* %d means output in decimal. */
192 if (tem < 10)
193 goto onedigit;
194 if (tem < 100)
195 goto twodigit;
196 case '3': /* %3 means output in decimal, 3 digits. */
197 if (tem > 999)
199 *op++ = tem / 1000 + '0';
200 tem %= 1000;
202 *op++ = tem / 100 + '0';
203 case '2': /* %2 means output in decimal, 2 digits. */
204 twodigit:
205 tem %= 100;
206 *op++ = tem / 10 + '0';
207 onedigit:
208 *op++ = tem % 10 + '0';
209 argp++;
210 break;
211 case 'p': /* %pN means use param N for next subst. */
212 tem = fixed_argp[(*p++) - '1'];
213 explicit_param_p = 1;
214 break;
215 case 'C':
216 /* For c-100: print quotient of value by 96, if nonzero,
217 then do like %+. */
218 if (tem >= 96)
220 *op++ = tem / 96;
221 tem %= 96;
223 case '+': /* %+x means add character code of char x. */
224 tem += *p++;
225 case '.': /* %. means output as character. */
226 if (left)
228 /* If want to forbid output of 0 and \n and \t,
229 and this is one of them, increment it. */
230 while (tem == 0 || tem == '\n' || tem == '\t')
232 tem++;
233 if (argp == old_argp)
234 doup++, outend -= strlen (up);
235 else
236 doleft++, outend -= strlen (left);
239 *op++ = tem ? tem : 0200;
240 case 'f': /* %f means discard next arg. */
241 argp++;
242 break;
244 case 'b': /* %b means back up one arg (and re-use it). */
245 argp--;
246 break;
248 case 'r': /* %r means interchange following two args. */
249 argp[0] = argp[1];
250 argp[1] = tem;
251 old_argp++;
252 break;
254 case '>': /* %>xy means if arg is > char code of x, */
255 if (argp[0] > *p++) /* then add char code of y to the arg, */
256 argp[0] += *p; /* and in any case don't output. */
257 p++; /* Leave the arg to be output later. */
258 break;
260 case 'a': /* %a means arithmetic. */
261 /* Next character says what operation.
262 Add or subtract either a constant or some other arg. */
263 /* First following character is + to add or - to subtract
264 or = to assign. */
265 /* Next following char is 'p' and an arg spec
266 (0100 plus position of that arg relative to this one)
267 or 'c' and a constant stored in a character. */
268 tem = p[2] & 0177;
269 if (p[1] == 'p')
270 tem = argp[tem - 0100];
271 if (p[0] == '-')
272 argp[0] -= tem;
273 else if (p[0] == '+')
274 argp[0] += tem;
275 else if (p[0] == '*')
276 argp[0] *= tem;
277 else if (p[0] == '/')
278 argp[0] /= tem;
279 else
280 argp[0] = tem;
282 p += 3;
283 break;
285 case 'i': /* %i means add one to arg, */
286 argp[0] ++; /* and leave it to be output later. */
287 argp[1] ++; /* Increment the following arg, too! */
288 break;
290 case '%': /* %% means output %; no arg. */
291 goto ordinary;
293 case 'n': /* %n means xor each of next two args with 140. */
294 argp[0] ^= 0140;
295 argp[1] ^= 0140;
296 break;
298 case 'm': /* %m means xor each of next two args with 177. */
299 argp[0] ^= 0177;
300 argp[1] ^= 0177;
301 break;
303 case 'B': /* %B means express arg as BCD char code. */
304 argp[0] += 6 * (tem / 10);
305 break;
307 case 'D': /* %D means weird Delta Data transformation. */
308 argp[0] -= 2 * (tem % 16);
309 break;
311 default:
312 abort ();
315 else
316 /* Ordinary character in the argument string. */
317 ordinary:
318 *op++ = c;
320 *op = 0;
321 while (doup-- > 0)
322 strcat (op, up);
323 while (doleft-- > 0)
324 strcat (op, left);
325 return outstring;
328 #ifdef DEBUG
330 main (argc, argv)
331 int argc;
332 char **argv;
334 char buf[50];
335 int args[3];
336 args[0] = atoi (argv[2]);
337 args[1] = atoi (argv[3]);
338 args[2] = atoi (argv[4]);
339 tparam1 (argv[1], buf, "LEFT", "UP", args);
340 printf ("%s\n", buf);
341 return 0;
344 #endif /* DEBUG */
346 /* arch-tag: 83f7b5ac-a808-4f75-b87a-123de009b402
347 (do not change this comment) */