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[emacs.git] / src / tparam.c
blob0548c722198ce2d260e8025c6cd574b3253b5e1e
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
27 #if defined(HAVE_STRING_H) || defined(STDC_HEADERS)
28 #define bcopy(s, d, n) memcpy ((d), (s), (n))
29 #endif
31 #ifdef STDC_HEADERS
32 #include <stdlib.h>
33 #include <string.h>
34 #else
35 char *malloc ();
36 char *realloc ();
37 #endif
39 #endif /* not emacs */
41 #ifndef NULL
42 #define NULL (char *) 0
43 #endif
45 #ifndef emacs
46 static void
47 memory_out ()
49 write (2, "virtual memory exhausted\n", 25);
50 exit (1);
53 static char *
54 xmalloc (size)
55 unsigned size;
57 register char *tem = malloc (size);
59 if (!tem)
60 memory_out ();
61 return tem;
64 static char *
65 xrealloc (ptr, size)
66 char *ptr;
67 unsigned size;
69 register char *tem = realloc (ptr, size);
71 if (!tem)
72 memory_out ();
73 return tem;
75 #endif /* not emacs */
77 /* Assuming STRING is the value of a termcap string entry
78 containing `%' constructs to expand parameters,
79 merge in parameter values and store result in block OUTSTRING points to.
80 LEN is the length of OUTSTRING. If more space is needed,
81 a block is allocated with `malloc'.
83 The value returned is the address of the resulting string.
84 This may be OUTSTRING or may be the address of a block got with `malloc'.
85 In the latter case, the caller must free the block.
87 The fourth and following args to tparam serve as the parameter values. */
89 static char *tparam1 ();
91 /* VARARGS 2 */
92 char *
93 tparam (string, outstring, len, arg0, arg1, arg2, arg3)
94 char *string;
95 char *outstring;
96 int len;
97 int arg0, arg1, arg2, arg3;
99 int arg[4];
101 arg[0] = arg0;
102 arg[1] = arg1;
103 arg[2] = arg2;
104 arg[3] = arg3;
105 return tparam1 (string, outstring, len, NULL, NULL, arg);
108 char *BC;
109 char *UP;
111 static char tgoto_buf[50];
113 char *
114 tgoto (cm, hpos, vpos)
115 char *cm;
116 int hpos, vpos;
118 int args[2];
119 if (!cm)
120 return NULL;
121 args[0] = vpos;
122 args[1] = hpos;
123 return tparam1 (cm, tgoto_buf, 50, UP, BC, args);
126 static char *
127 tparam1 (string, outstring, len, up, left, argp)
128 char *string;
129 char *outstring;
130 int len;
131 char *up, *left;
132 register int *argp;
134 register int c;
135 register char *p = string;
136 register char *op = outstring;
137 char *outend;
138 int outlen = 0;
140 register int tem;
141 int *old_argp = argp;
142 int doleft = 0;
143 int doup = 0;
145 outend = outstring + len;
147 while (1)
149 /* If the buffer might be too short, make it bigger. */
150 if (op + 5 >= outend)
152 register char *new;
153 int offset = op - outstring;
155 if (outlen == 0)
157 outlen = len + 40;
158 new = (char *) xmalloc (outlen);
159 bcopy (outstring, new, offset);
161 else
163 outlen *= 2;
164 new = (char *) xrealloc (outstring, outlen);
167 op = new + offset;
168 outend = new + outlen;
169 outstring = new;
171 c = *p++;
172 if (!c)
173 break;
174 if (c == '%')
176 c = *p++;
177 tem = *argp;
178 switch (c)
180 case 'd': /* %d means output in decimal. */
181 if (tem < 10)
182 goto onedigit;
183 if (tem < 100)
184 goto twodigit;
185 case '3': /* %3 means output in decimal, 3 digits. */
186 if (tem > 999)
188 *op++ = tem / 1000 + '0';
189 tem %= 1000;
191 *op++ = tem / 100 + '0';
192 case '2': /* %2 means output in decimal, 2 digits. */
193 twodigit:
194 tem %= 100;
195 *op++ = tem / 10 + '0';
196 onedigit:
197 *op++ = tem % 10 + '0';
198 argp++;
199 break;
201 case 'C':
202 /* For c-100: print quotient of value by 96, if nonzero,
203 then do like %+. */
204 if (tem >= 96)
206 *op++ = tem / 96;
207 tem %= 96;
209 case '+': /* %+x means add character code of char x. */
210 tem += *p++;
211 case '.': /* %. means output as character. */
212 if (left)
214 /* If want to forbid output of 0 and \n and \t,
215 and this is one of them, increment it. */
216 while (tem == 0 || tem == '\n' || tem == '\t')
218 tem++;
219 if (argp == old_argp)
220 doup++, outend -= strlen (up);
221 else
222 doleft++, outend -= strlen (left);
225 *op++ = tem ? tem : 0200;
226 case 'f': /* %f means discard next arg. */
227 argp++;
228 break;
230 case 'b': /* %b means back up one arg (and re-use it). */
231 argp--;
232 break;
234 case 'r': /* %r means interchange following two args. */
235 argp[0] = argp[1];
236 argp[1] = tem;
237 old_argp++;
238 break;
240 case '>': /* %>xy means if arg is > char code of x, */
241 if (argp[0] > *p++) /* then add char code of y to the arg, */
242 argp[0] += *p; /* and in any case don't output. */
243 p++; /* Leave the arg to be output later. */
244 break;
246 case 'a': /* %a means arithmetic. */
247 /* Next character says what operation.
248 Add or subtract either a constant or some other arg. */
249 /* First following character is + to add or - to subtract
250 or = to assign. */
251 /* Next following char is 'p' and an arg spec
252 (0100 plus position of that arg relative to this one)
253 or 'c' and a constant stored in a character. */
254 tem = p[2] & 0177;
255 if (p[1] == 'p')
256 tem = argp[tem - 0100];
257 if (p[0] == '-')
258 argp[0] -= tem;
259 else if (p[0] == '+')
260 argp[0] += tem;
261 else if (p[0] == '*')
262 argp[0] *= tem;
263 else if (p[0] == '/')
264 argp[0] /= tem;
265 else
266 argp[0] = tem;
268 p += 3;
269 break;
271 case 'i': /* %i means add one to arg, */
272 argp[0] ++; /* and leave it to be output later. */
273 argp[1] ++; /* Increment the following arg, too! */
274 break;
276 case '%': /* %% means output %; no arg. */
277 goto ordinary;
279 case 'n': /* %n means xor each of next two args with 140. */
280 argp[0] ^= 0140;
281 argp[1] ^= 0140;
282 break;
284 case 'm': /* %m means xor each of next two args with 177. */
285 argp[0] ^= 0177;
286 argp[1] ^= 0177;
287 break;
289 case 'B': /* %B means express arg as BCD char code. */
290 argp[0] += 6 * (tem / 10);
291 break;
293 case 'D': /* %D means weird Delta Data transformation. */
294 argp[0] -= 2 * (tem % 16);
295 break;
297 default:
298 abort ();
301 else
302 /* Ordinary character in the argument string. */
303 ordinary:
304 *op++ = c;
306 *op = 0;
307 while (doup-- > 0)
308 strcat (op, up);
309 while (doleft-- > 0)
310 strcat (op, left);
311 return outstring;
314 #ifdef DEBUG
316 main (argc, argv)
317 int argc;
318 char **argv;
320 char buf[50];
321 int args[3];
322 args[0] = atoi (argv[2]);
323 args[1] = atoi (argv[3]);
324 args[2] = atoi (argv[4]);
325 tparam1 (argv[1], buf, "LEFT", "UP", args);
326 printf ("%s\n", buf);
327 return 0;
330 #endif /* DEBUG */