1 /* $OpenBSD: misc.c,v 1.47 2017/06/15 13:48:42 bcallah Exp $ */
2 /* $NetBSD: misc.c,v 1.6 1995/09/28 05:37:41 tls Exp $ */
3
4 /*-
5 * SPDX-License-Identifier: BSD-3-Clause
6 *
7 * Copyright (c) 1989, 1993
8 * The Regents of the University of California. All rights reserved.
9 *
10 * This code is derived from software contributed to Berkeley by
11 * Ozan Yigit at York University.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
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 <stdint.h>
44 #include <stdlib.h>
45 #include <stddef.h>
46 #include <string.h>
47 #include <err.h>
48 #include "mdef.h"
49 #include "stdd.h"
50 #include "extern.h"
51 #include "pathnames.h"
52
53
54 char *ep; /* first free char in strspace */
55 static char *strspace; /* string space for evaluation */
56 char *endest; /* end of string space */
57 static size_t strsize = STRSPMAX;
58 static size_t bufsize = BUFSIZE;
59
60 unsigned char *buf; /* push-back buffer */
61 unsigned char *bufbase; /* the base for current ilevel */
62 unsigned char *bbase[MAXINP]; /* the base for each ilevel */
63 unsigned char *bp; /* first available character */
64 unsigned char *endpbb; /* end of push-back buffer */
65
66
67 /*
68 * find the index of second str in the first str.
69 */
70 ptrdiff_t
indx(const char * s1,const char * s2)71 indx(const char *s1, const char *s2)
72 {
73 char *t;
74
75 t = strstr(s1, s2);
76 if (t == NULL)
77 return (-1);
78 else
79 return (t - s1);
80 }
81 /*
82 * pushback - push character back onto input
83 */
84 void
pushback(int c)85 pushback(int c)
86 {
87 if (c == EOF)
88 return;
89 if (bp >= endpbb)
90 enlarge_bufspace();
91 *bp++ = c;
92 }
93
94 /*
95 * pbstr - push string back onto input
96 * pushback is replicated to improve
97 * performance.
98 */
99 void
pbstr(const char * s)100 pbstr(const char *s)
101 {
102 size_t n;
103
104 n = strlen(s);
105 while (endpbb - bp <= (long)n)
106 enlarge_bufspace();
107 while (n > 0)
108 *bp++ = s[--n];
109 }
110
111 /*
112 * pbnum - convert number to string, push back on input.
113 */
114 void
pbnum(int n)115 pbnum(int n)
116 {
117 pbnumbase(n, 10, 0);
118 }
119
120 void
pbnumbase(int n,int base,int d)121 pbnumbase(int n, int base, int d)
122 {
123 static char digits[36] __nonstring =
124 "0123456789abcdefghijklmnopqrstuvwxyz";
125 unsigned int num;
126 int printed = 0;
127
128 if (base > 36)
129 m4errx(1, "base %d > 36: not supported.", base);
130
131 if (base < 2)
132 m4errx(1, "bad base %d for conversion.", base);
133
134 num = (n < 0) ? -n : n;
135 do {
136 pushback(digits[num % base]);
137 printed++;
138 }
139 while ((num /= base) > 0);
140
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 = 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] == STORAGE_STRSPACE)
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 (void) 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 (void) fclose(outfile[n]);
260 }
261 }
262
263 extern char *__progname;
264
265 void
m4errx(int eval,const char * fmt,...)266 m4errx(int eval, 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(eval);
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 = xreallocarray(outfile, n, sizeof(FILE *),
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 *
xcalloc(size_t n,size_t s,const char * fmt,...)315 xcalloc(size_t n, size_t s, const char *fmt, ...)
316 {
317 void *p = calloc(n, s);
318
319 if (p == NULL) {
320 if (fmt == NULL)
321 err(1, "calloc");
322 else {
323 va_list va;
324
325 va_start(va, fmt);
326 verr(1, fmt, va);
327 va_end(va);
328 }
329 }
330 return p;
331 }
332
333 void *
xrealloc(void * old,size_t n,const char * fmt,...)334 xrealloc(void *old, size_t n, const char *fmt, ...)
335 {
336 char *p = realloc(old, n);
337
338 if (p == NULL) {
339 free(old);
340 if (fmt == NULL)
341 err(1, "realloc");
342 else {
343 va_list va;
344
345 va_start(va, fmt);
346 verr(1, fmt, va);
347 va_end(va);
348 }
349 }
350 return p;
351 }
352
353 void *
xreallocarray(void * old,size_t s1,size_t s2,const char * fmt,...)354 xreallocarray(void *old, size_t s1, size_t s2, const char *fmt, ...)
355 {
356 void *p = reallocarray(old, s1, s2);
357
358 if (p == NULL) {
359 free(old);
360 if (fmt == NULL)
361 err(1, "reallocarray");
362 else {
363 va_list va;
364
365 va_start(va, fmt);
366 verr(1, fmt, va);
367 va_end(va);
368 }
369 }
370 return p;
371 }
372
373 char *
xstrdup(const char * s)374 xstrdup(const char *s)
375 {
376 char *p = strdup(s);
377 if (p == NULL)
378 err(1, "strdup");
379 return p;
380 }
381
382 void
usage(void)383 usage(void)
384 {
385 fprintf(stderr, "usage: m4 [-EgPs] [-Dname[=value]] [-d flags] "
386 "[-I dirname] [-o filename]\n"
387 "\t[-t macro] [-Uname] [file ...]\n");
388 exit(1);
389 }
390
391 int
obtain_char(struct input_file * f)392 obtain_char(struct input_file *f)
393 {
394 if (f->c == EOF)
395 return EOF;
396
397 f->c = fgetc(f->file);
398 if (f->c == '\n')
399 f->lineno++;
400
401 return f->c;
402 }
403
404 void
set_input(struct input_file * f,FILE * real,const char * name)405 set_input(struct input_file *f, FILE *real, const char *name)
406 {
407 f->file = real;
408 f->lineno = 1;
409 f->c = 0;
410 f->name = xstrdup(name);
411 emit_synchline();
412 }
413
414 void
do_emit_synchline(void)415 do_emit_synchline(void)
416 {
417 fprintf(active, "#line %lu \"%s\"\n",
418 infile[ilevel].lineno, infile[ilevel].name);
419 infile[ilevel].synch_lineno = infile[ilevel].lineno;
420 }
421
422 void
release_input(struct input_file * f)423 release_input(struct input_file *f)
424 {
425 if (ferror(f->file))
426 errx(1, "Fatal error reading from %s\n", f->name);
427 if (f->file != stdin)
428 fclose(f->file);
429 f->c = EOF;
430 /*
431 * XXX can't free filename, as there might still be
432 * error information pointing to it.
433 */
434 }
435
436 void
doprintlineno(struct input_file * f)437 doprintlineno(struct input_file *f)
438 {
439 pbunsigned(f->lineno);
440 }
441
442 void
doprintfilename(struct input_file * f)443 doprintfilename(struct input_file *f)
444 {
445 pbstr(rquote);
446 pbstr(f->name);
447 pbstr(lquote);
448 }
449
450 /*
451 * buffer_mark/dump_buffer: allows one to save a mark in a buffer,
452 * and later dump everything that was added since then to a file.
453 */
454 size_t
buffer_mark(void)455 buffer_mark(void)
456 {
457 return bp - buf;
458 }
459
460
461 void
dump_buffer(FILE * f,size_t m)462 dump_buffer(FILE *f, size_t m)
463 {
464 unsigned char *s;
465
466 for (s = bp; s-buf > (long)m;)
467 fputc(*--s, f);
468 }
469