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1 /* Merge parameters into a termcap entry string.
2 Copyright (C) 1985, 87, 93, 95, 2000 Free Software Foundation, Inc.
3
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.
8
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.
13
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. */
18
19 /* Emacs config.h may rename various library functions such as malloc. */
20 #ifdef HAVE_CONFIG_H
21 #include <config.h>
22 #endif
23
24 #ifdef emacs
25 #include "lisp.h" /* for xmalloc */
26 #else
27
28 #ifdef STDC_HEADERS
29 #include <stdlib.h>
30 #include <string.h>
31 #else
32 char *malloc ();
33 char *realloc ();
34 #endif
35
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
40
41 #endif /* not emacs */
42
43 #ifndef NULL
44 #define NULL (char *) 0
45 #endif
46
47 #ifndef emacs
48 static void
49 memory_out ()
50 {
51 write (2, "virtual memory exhausted\n", 25);
52 exit (1);
53 }
54
55 static char *
56 xmalloc (size)
57 unsigned size;
58 {
59 register char *tem = malloc (size);
60
61 if (!tem)
62 memory_out ();
63 return tem;
64 }
65
66 static char *
67 xrealloc (ptr, size)
68 char *ptr;
69 unsigned size;
70 {
71 register char *tem = realloc (ptr, size);
72
73 if (!tem)
74 memory_out ();
75 return tem;
76 }
77 #endif /* not emacs */
78
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'.
84
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.
88
89 The fourth and following args to tparam serve as the parameter values. */
90
91 static char *tparam1 ();
92
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;
100 {
101 int arg[4];
102
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);
108 }
109
110 char *BC;
111 char *UP;
112
113 static char tgoto_buf[50];
114
115 char *
116 tgoto (cm, hpos, vpos)
117 char *cm;
118 int hpos, vpos;
119 {
120 int args[2];
121 if (!cm)
122 return NULL;
123 args[0] = vpos;
124 args[1] = hpos;
125 return tparam1 (cm, tgoto_buf, 50, UP, BC, args);
126 }
127
128 static char *
129 tparam1 (string, outstring, len, up, left, argp)
130 char *string;
131 char *outstring;
132 int len;
133 char *up, *left;
134 register int *argp;
135 {
136 register int c;
137 register char *p = string;
138 register char *op = outstring;
139 char *outend;
140 int outlen = 0;
141
142 register int tem;
143 int *old_argp = argp;
144 int doleft = 0;
145 int doup = 0;
146
147 outend = outstring + len;
148
149 while (1)
150 {
151 /* If the buffer might be too short, make it bigger. */
152 if (op + 5 >= outend)
153 {
154 register char *new;
155 int offset = op - outstring;
156
157 if (outlen == 0)
158 {
159 outlen = len + 40;
160 new = (char *) xmalloc (outlen);
161 bcopy (outstring, new, offset);
162 }
163 else
164 {
165 outlen *= 2;
166 new = (char *) xrealloc (outstring, outlen);
167 }
168
169 op = new + offset;
170 outend = new + outlen;
171 outstring = new;
172 }
173 c = *p++;
174 if (!c)
175 break;
176 if (c == '%')
177 {
178 c = *p++;
179 tem = *argp;
180 switch (c)
181 {
182 case 'd': /* %d means output in decimal. */
183 if (tem < 10)
184 goto onedigit;
185 if (tem < 100)
186 goto twodigit;
187 case '3': /* %3 means output in decimal, 3 digits. */
188 if (tem > 999)
189 {
190 *op++ = tem / 1000 + '0';
191 tem %= 1000;
192 }
193 *op++ = tem / 100 + '0';
194 case '2': /* %2 means output in decimal, 2 digits. */
195 twodigit:
196 tem %= 100;
197 *op++ = tem / 10 + '0';
198 onedigit:
199 *op++ = tem % 10 + '0';
200 argp++;
201 break;
202
203 case 'C':
204 /* For c-100: print quotient of value by 96, if nonzero,
205 then do like %+. */
206 if (tem >= 96)
207 {
208 *op++ = tem / 96;
209 tem %= 96;
210 }
211 case '+': /* %+x means add character code of char x. */
212 tem += *p++;
213 case '.': /* %. means output as character. */
214 if (left)
215 {
216 /* If want to forbid output of 0 and \n and \t,
217 and this is one of them, increment it. */
218 while (tem == 0 || tem == '\n' || tem == '\t')
219 {
220 tem++;
221 if (argp == old_argp)
222 doup++, outend -= strlen (up);
223 else
224 doleft++, outend -= strlen (left);
225 }
226 }
227 *op++ = tem ? tem : 0200;
228 case 'f': /* %f means discard next arg. */
229 argp++;
230 break;
231
232 case 'b': /* %b means back up one arg (and re-use it). */
233 argp--;
234 break;
235
236 case 'r': /* %r means interchange following two args. */
237 argp[0] = argp[1];
238 argp[1] = tem;
239 old_argp++;
240 break;
241
242 case '>': /* %>xy means if arg is > char code of x, */
243 if (argp[0] > *p++) /* then add char code of y to the arg, */
244 argp[0] += *p; /* and in any case don't output. */
245 p++; /* Leave the arg to be output later. */
246 break;
247
248 case 'a': /* %a means arithmetic. */
249 /* Next character says what operation.
250 Add or subtract either a constant or some other arg. */
251 /* First following character is + to add or - to subtract
252 or = to assign. */
253 /* Next following char is 'p' and an arg spec
254 (0100 plus position of that arg relative to this one)
255 or 'c' and a constant stored in a character. */
256 tem = p[2] & 0177;
257 if (p[1] == 'p')
258 tem = argp[tem - 0100];
259 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 if (p[0] == '/')
266 argp[0] /= tem;
267 else
268 argp[0] = tem;
269
270 p += 3;
271 break;
272
273 case 'i': /* %i means add one to arg, */
274 argp[0] ++; /* and leave it to be output later. */
275 argp[1] ++; /* Increment the following arg, too! */
276 break;
277
278 case '%': /* %% means output %; no arg. */
279 goto ordinary;
280
281 case 'n': /* %n means xor each of next two args with 140. */
282 argp[0] ^= 0140;
283 argp[1] ^= 0140;
284 break;
285
286 case 'm': /* %m means xor each of next two args with 177. */
287 argp[0] ^= 0177;
288 argp[1] ^= 0177;
289 break;
290
291 case 'B': /* %B means express arg as BCD char code. */
292 argp[0] += 6 * (tem / 10);
293 break;
294
295 case 'D': /* %D means weird Delta Data transformation. */
296 argp[0] -= 2 * (tem % 16);
297 break;
298
299 default:
300 abort ();
301 }
302 }
303 else
304 /* Ordinary character in the argument string. */
305 ordinary:
306 *op++ = c;
307 }
308 *op = 0;
309 while (doup-- > 0)
310 strcat (op, up);
311 while (doleft-- > 0)
312 strcat (op, left);
313 return outstring;
314 }
315
316 #ifdef DEBUG
317
318 main (argc, argv)
319 int argc;
320 char **argv;
321 {
322 char buf[50];
323 int args[3];
324 args[0] = atoi (argv[2]);
325 args[1] = atoi (argv[3]);
326 args[2] = atoi (argv[4]);
327 tparam1 (argv[1], buf, "LEFT", "UP", args);
328 printf ("%s\n", buf);
329 return 0;
330 }
331
332 #endif /* DEBUG */