1 /* $OpenBSD: misc.c,v 1.42 2010/09/07 19:58:09 marco Exp $ */
2 /* $NetBSD: misc.c,v 1.6 1995/09/28 05:37:41 tls Exp $ */
3
4 /*
5 * Copyright (c) 1989, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * Ozan Yigit at York University.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 * $FreeBSD: src/usr.bin/m4/misc.c,v 1.18 2012/11/17 01:54:24 svnexp Exp $
36 */
37
38 #include <sys/types.h>
39 #include <errno.h>
40 #include <unistd.h>
41 #include <stdarg.h>
42 #include <stdio.h>
43 #include <stdlib.h>
44 #include <stddef.h>
45 #include <string.h>
46 #include <err.h>
47 #include "mdef.h"
48 #include "stdd.h"
49 #include "extern.h"
50 #include "pathnames.h"
51
52
53 char *ep; /* first free char in strspace */
54 static char *strspace; /* string space for evaluation */
55 char *endest; /* end of string space */
56 static size_t strsize = STRSPMAX;
57 static size_t bufsize = BUFSIZE;
58
59 unsigned char *buf; /* push-back buffer */
60 unsigned char *bufbase; /* the base for current ilevel */
61 unsigned char *bbase[MAXINP]; /* the base for each ilevel */
62 unsigned char *bp; /* first available character */
63 unsigned char *endpbb; /* end of push-back buffer */
64
65
66 /*
67 * find the index of second str in the first str.
68 */
69 ptrdiff_t
indx(const char * s1,const char * s2)70 indx(const char *s1, const char *s2)
71 {
72 char *t;
73
74 t = strstr(s1, s2);
75 if (t == NULL)
76 return (-1);
77 else
78 return (t - s1);
79 }
80 /*
81 * pushback - push character back onto input
82 */
83 void
pushback(int c)84 pushback(int c)
85 {
86 if (c == EOF)
87 return;
88 if (bp >= endpbb)
89 enlarge_bufspace();
90 *bp++ = c;
91 }
92
93 /*
94 * pbstr - push string back onto input
95 * pushback is replicated to improve
96 * performance.
97 */
98 void
pbstr(const char * s)99 pbstr(const char *s)
100 {
101 size_t n;
102
103 n = strlen(s);
104 while (endpbb - bp <= (long)n)
105 enlarge_bufspace();
106 while (n > 0)
107 *bp++ = s[--n];
108 }
109
110 /*
111 * pbnum - convert number to string, push back on input.
112 */
113 void
pbnum(int n)114 pbnum(int n)
115 {
116 pbnumbase(n, 10, 0);
117 }
118
119 void
pbnumbase(int n,int base,int d)120 pbnumbase(int n, int base, int d)
121 {
122 static char digits[36] = "0123456789abcdefghijklmnopqrstuvwxyz";
123 int num;
124 int printed = 0;
125
126 if (base > 36)
127 m4errx(1, "base %d > 36: not supported.", base);
128
129 if (base < 2)
130 m4errx(1, "bad base %d for conversion.", base);
131
132 num = (n < 0) ? -n : n;
133 do {
134 pushback(digits[num % base]);
135 printed++;
136 }
137 while ((num /= base) > 0);
138
139 if (n < 0)
140 printed++;
141 while (printed++ < d)
142 pushback('0');
143
144 if (n < 0)
145 pushback('-');
146 }
147
148 /*
149 * pbunsigned - convert unsigned long to string, push back on input.
150 */
151 void
pbunsigned(unsigned long n)152 pbunsigned(unsigned long n)
153 {
154 do {
155 pushback(n % 10 + '0');
156 }
157 while ((n /= 10) > 0);
158 }
159
160 void
initspaces(void)161 initspaces(void)
162 {
163 int i;
164
165 strspace = xalloc(strsize + 1, NULL);
166 ep = strspace;
167 endest = strspace + strsize;
168 buf = (unsigned char *)xalloc(bufsize, NULL);
169 bufbase = buf;
170 bp = buf;
171 endpbb = buf + bufsize;
172 for (i = 0; i < MAXINP; i++)
173 bbase[i] = buf;
174 }
175
176 void
enlarge_strspace(void)177 enlarge_strspace(void)
178 {
179 char *newstrspace;
180 int i;
181
182 strsize *= 2;
183 newstrspace = malloc(strsize + 1);
184 if (!newstrspace)
185 errx(1, "string space overflow");
186 memcpy(newstrspace, strspace, strsize/2);
187 for (i = 0; i <= sp; i++)
188 if (sstack[i])
189 mstack[i].sstr = (mstack[i].sstr - strspace) +
190 newstrspace;
191 ep = (ep-strspace) + newstrspace;
192 free(strspace);
193 strspace = newstrspace;
194 endest = strspace + strsize;
195 }
196
197 void
enlarge_bufspace(void)198 enlarge_bufspace(void)
199 {
200 unsigned char *newbuf;
201 int i;
202
203 bufsize += bufsize / 2;
204 newbuf = xrealloc(buf, bufsize, "too many characters pushed back");
205 for (i = 0; i < MAXINP; i++)
206 bbase[i] = (bbase[i] - buf) + newbuf;
207 bp = (bp - buf) + newbuf;
208 bufbase = (bufbase - buf) + newbuf;
209 buf = newbuf;
210 endpbb = buf + bufsize;
211 }
212
213 /*
214 * chrsave - put single char on string space
215 */
216 void
chrsave(int c)217 chrsave(int c)
218 {
219 if (ep >= endest)
220 enlarge_strspace();
221 *ep++ = c;
222 }
223
224 /*
225 * read in a diversion file, and dispose it.
226 */
227 void
getdiv(int n)228 getdiv(int n)
229 {
230 int c;
231
232 if (active == outfile[n])
233 m4errx(1, "undivert: diversion still active.");
234 rewind(outfile[n]);
235 while ((c = getc(outfile[n])) != EOF)
236 putc(c, active);
237 fclose(outfile[n]);
238 outfile[n] = NULL;
239 }
240
241 void
onintr(int signo __unused)242 onintr(int signo __unused)
243 {
244 #define intrmessage "m4: interrupted.\n"
245 write(STDERR_FILENO, intrmessage, sizeof(intrmessage) - 1);
246 _exit(1);
247 }
248
249 /*
250 * killdiv - get rid of the diversion files
251 */
252 void
killdiv(void)253 killdiv(void)
254 {
255 int n;
256
257 for (n = 0; n < maxout; n++)
258 if (outfile[n] != NULL) {
259 fclose(outfile[n]);
260 }
261 }
262
263 extern const char *__progname;
264
265 void
m4errx(int evaluation,const char * fmt,...)266 m4errx(int evaluation, const char *fmt, ...)
267 {
268 fprintf(stderr, "%s: ", __progname);
269 fprintf(stderr, "%s at line %lu: ", CURRENT_NAME, CURRENT_LINE);
270 if (fmt != NULL) {
271 va_list ap;
272
273 va_start(ap, fmt);
274 vfprintf(stderr, fmt, ap);
275 va_end(ap);
276 }
277 fprintf(stderr, "\n");
278 exit(evaluation);
279 }
280
281 /*
282 * resizedivs: allocate more diversion files */
283 void
resizedivs(int n)284 resizedivs(int n)
285 {
286 int i;
287
288 outfile = (FILE **)xrealloc(outfile, sizeof(FILE *) * n,
289 "too many diverts %d", n);
290 for (i = maxout; i < n; i++)
291 outfile[i] = NULL;
292 maxout = n;
293 }
294
295 void *
xalloc(size_t n,const char * fmt,...)296 xalloc(size_t n, const char *fmt, ...)
297 {
298 void *p = malloc(n);
299
300 if (p == NULL) {
301 if (fmt == NULL)
302 err(1, "malloc");
303 else {
304 va_list va;
305
306 va_start(va, fmt);
307 verr(1, fmt, va);
308 va_end(va);
309 }
310 }
311 return p;
312 }
313
314 void *
xrealloc(void * old,size_t n,const char * fmt,...)315 xrealloc(void *old, size_t n, const char *fmt, ...)
316 {
317 char *p = realloc(old, n);
318
319 if (p == NULL) {
320 free(old);
321 if (fmt == NULL)
322 err(1, "realloc");
323 else {
324 va_list va;
325
326 va_start(va, fmt);
327 verr(1, fmt, va);
328 va_end(va);
329 }
330 }
331 return p;
332 }
333
334 char *
xstrdup(const char * s)335 xstrdup(const char *s)
336 {
337 char *p = strdup(s);
338 if (p == NULL)
339 err(1, "strdup");
340 return p;
341 }
342
343 void
usage(void)344 usage(void)
345 {
346 fprintf(stderr, "usage: m4 [-gPs] [-Dname[=value]] [-d flags] "
347 "[-I dirname] [-o filename]\n"
348 "\t[-t macro] [-Uname] [file ...]\n");
349 exit(1);
350 }
351
352 int
obtain_char(struct input_file * f)353 obtain_char(struct input_file *f)
354 {
355 if (f->c == EOF)
356 return EOF;
357
358 f->c = fgetc(f->file);
359 if (f->c == '\n')
360 f->lineno++;
361
362 return f->c;
363 }
364
365 void
set_input(struct input_file * f,FILE * real,const char * name)366 set_input(struct input_file *f, FILE *real, const char *name)
367 {
368 f->file = real;
369 f->lineno = 1;
370 f->c = 0;
371 f->name = xstrdup(name);
372 emit_synchline();
373 }
374
375 void
do_emit_synchline(void)376 do_emit_synchline(void)
377 {
378 fprintf(active, "#line %lu \"%s\"\n",
379 infile[ilevel].lineno, infile[ilevel].name);
380 infile[ilevel].synch_lineno = infile[ilevel].lineno;
381 }
382
383 void
release_input(struct input_file * f)384 release_input(struct input_file *f)
385 {
386 if (f->file != stdin)
387 fclose(f->file);
388 f->c = EOF;
389 /*
390 * XXX can't free filename, as there might still be
391 * error information pointing to it.
392 */
393 }
394
395 void
doprintlineno(struct input_file * f)396 doprintlineno(struct input_file *f)
397 {
398 pbunsigned(f->lineno);
399 }
400
401 void
doprintfilename(struct input_file * f)402 doprintfilename(struct input_file *f)
403 {
404 pbstr(rquote);
405 pbstr(f->name);
406 pbstr(lquote);
407 }
408
409 /*
410 * buffer_mark/dump_buffer: allows one to save a mark in a buffer,
411 * and later dump everything that was added since then to a file.
412 */
413 size_t
buffer_mark(void)414 buffer_mark(void)
415 {
416 return bp - buf;
417 }
418
419
420 void
dump_buffer(FILE * f,size_t m)421 dump_buffer(FILE *f, size_t m)
422 {
423 unsigned char *s;
424
425 for (s = bp; s-buf > (long)m;)
426 fputc(*--s, f);
427 }
428