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/cdefs.h>
39 __FBSDID("$FreeBSD: stable/12/usr.bin/m4/misc.c 352277 2019-09-13 07:10:50Z bapt $");
40
41 #include <sys/types.h>
42 #include <errno.h>
43 #include <unistd.h>
44 #include <stdarg.h>
45 #include <stdio.h>
46 #include <stdint.h>
47 #include <stdlib.h>
48 #include <stddef.h>
49 #include <string.h>
50 #include <err.h>
51 #include "mdef.h"
52 #include "stdd.h"
53 #include "extern.h"
54 #include "pathnames.h"
55
56
57 char *ep; /* first free char in strspace */
58 static char *strspace; /* string space for evaluation */
59 char *endest; /* end of string space */
60 static size_t strsize = STRSPMAX;
61 static size_t bufsize = BUFSIZE;
62
63 unsigned char *buf; /* push-back buffer */
64 unsigned char *bufbase; /* the base for current ilevel */
65 unsigned char *bbase[MAXINP]; /* the base for each ilevel */
66 unsigned char *bp; /* first available character */
67 unsigned char *endpbb; /* end of push-back buffer */
68
69
70 /*
71 * find the index of second str in the first str.
72 */
73 ptrdiff_t
indx(const char * s1,const char * s2)74 indx(const char *s1, const char *s2)
75 {
76 char *t;
77
78 t = strstr(s1, s2);
79 if (t == NULL)
80 return (-1);
81 else
82 return (t - s1);
83 }
84 /*
85 * pushback - push character back onto input
86 */
87 void
pushback(int c)88 pushback(int c)
89 {
90 if (c == EOF)
91 return;
92 if (bp >= endpbb)
93 enlarge_bufspace();
94 *bp++ = c;
95 }
96
97 /*
98 * pbstr - push string back onto input
99 * pushback is replicated to improve
100 * performance.
101 */
102 void
pbstr(const char * s)103 pbstr(const char *s)
104 {
105 size_t n;
106
107 n = strlen(s);
108 while (endpbb - bp <= (long)n)
109 enlarge_bufspace();
110 while (n > 0)
111 *bp++ = s[--n];
112 }
113
114 /*
115 * pbnum - convert number to string, push back on input.
116 */
117 void
pbnum(int n)118 pbnum(int n)
119 {
120 pbnumbase(n, 10, 0);
121 }
122
123 void
pbnumbase(int n,int base,int d)124 pbnumbase(int n, int base, int d)
125 {
126 static char digits[36] = "0123456789abcdefghijklmnopqrstuvwxyz";
127 int num;
128 int printed = 0;
129
130 if (base > 36)
131 m4errx(1, "base %d > 36: not supported.", base);
132
133 if (base < 2)
134 m4errx(1, "bad base %d for conversion.", base);
135
136 num = (n < 0) ? -n : n;
137 do {
138 pushback(digits[num % base]);
139 printed++;
140 }
141 while ((num /= base) > 0);
142
143 if (n < 0)
144 printed++;
145 while (printed++ < d)
146 pushback('0');
147
148 if (n < 0)
149 pushback('-');
150 }
151
152 /*
153 * pbunsigned - convert unsigned long to string, push back on input.
154 */
155 void
pbunsigned(unsigned long n)156 pbunsigned(unsigned long n)
157 {
158 do {
159 pushback(n % 10 + '0');
160 }
161 while ((n /= 10) > 0);
162 }
163
164 void
initspaces(void)165 initspaces(void)
166 {
167 int i;
168
169 strspace = xalloc(strsize+1, NULL);
170 ep = strspace;
171 endest = strspace+strsize;
172 buf = xalloc(bufsize, NULL);
173 bufbase = buf;
174 bp = buf;
175 endpbb = buf + bufsize;
176 for (i = 0; i < MAXINP; i++)
177 bbase[i] = buf;
178 }
179
180 void
enlarge_strspace(void)181 enlarge_strspace(void)
182 {
183 char *newstrspace;
184 int i;
185
186 strsize *= 2;
187 newstrspace = malloc(strsize + 1);
188 if (!newstrspace)
189 errx(1, "string space overflow");
190 memcpy(newstrspace, strspace, strsize/2);
191 for (i = 0; i <= sp; i++)
192 if (sstack[i] == STORAGE_STRSPACE)
193 mstack[i].sstr = (mstack[i].sstr - strspace)
194 + newstrspace;
195 ep = (ep-strspace) + newstrspace;
196 free(strspace);
197 strspace = newstrspace;
198 endest = strspace + strsize;
199 }
200
201 void
enlarge_bufspace(void)202 enlarge_bufspace(void)
203 {
204 unsigned char *newbuf;
205 int i;
206
207 bufsize += bufsize/2;
208 newbuf = xrealloc(buf, bufsize, "too many characters pushed back");
209 for (i = 0; i < MAXINP; i++)
210 bbase[i] = (bbase[i]-buf)+newbuf;
211 bp = (bp-buf)+newbuf;
212 bufbase = (bufbase-buf)+newbuf;
213 buf = newbuf;
214 endpbb = buf+bufsize;
215 }
216
217 /*
218 * chrsave - put single char on string space
219 */
220 void
chrsave(int c)221 chrsave(int c)
222 {
223 if (ep >= endest)
224 enlarge_strspace();
225 *ep++ = c;
226 }
227
228 /*
229 * read in a diversion file, and dispose it.
230 */
231 void
getdiv(int n)232 getdiv(int n)
233 {
234 int c;
235
236 if (active == outfile[n])
237 m4errx(1, "undivert: diversion still active.");
238 rewind(outfile[n]);
239 while ((c = getc(outfile[n])) != EOF)
240 putc(c, active);
241 (void) fclose(outfile[n]);
242 outfile[n] = NULL;
243 }
244
245 void
onintr(int signo __unused)246 onintr(int signo __unused)
247 {
248 #define intrmessage "m4: interrupted.\n"
249 write(STDERR_FILENO, intrmessage, sizeof(intrmessage)-1);
250 _exit(1);
251 }
252
253 /*
254 * killdiv - get rid of the diversion files
255 */
256 void
killdiv(void)257 killdiv(void)
258 {
259 int n;
260
261 for (n = 0; n < maxout; n++)
262 if (outfile[n] != NULL) {
263 (void) fclose(outfile[n]);
264 }
265 }
266
267 extern char *__progname;
268
269 void
m4errx(int eval,const char * fmt,...)270 m4errx(int eval, const char *fmt, ...)
271 {
272 fprintf(stderr, "%s: ", __progname);
273 fprintf(stderr, "%s at line %lu: ", CURRENT_NAME, CURRENT_LINE);
274 if (fmt != NULL) {
275 va_list ap;
276
277 va_start(ap, fmt);
278 vfprintf(stderr, fmt, ap);
279 va_end(ap);
280 }
281 fprintf(stderr, "\n");
282 exit(eval);
283 }
284
285 /*
286 * resizedivs: allocate more diversion files */
287 void
resizedivs(int n)288 resizedivs(int n)
289 {
290 int i;
291
292 outfile = xreallocarray(outfile, n, sizeof(FILE *),
293 "too many diverts %d", n);
294 for (i = maxout; i < n; i++)
295 outfile[i] = NULL;
296 maxout = n;
297 }
298
299 void *
xalloc(size_t n,const char * fmt,...)300 xalloc(size_t n, const char *fmt, ...)
301 {
302 void *p = malloc(n);
303
304 if (p == NULL) {
305 if (fmt == NULL)
306 err(1, "malloc");
307 else {
308 va_list va;
309
310 va_start(va, fmt);
311 verr(1, fmt, va);
312 va_end(va);
313 }
314 }
315 return p;
316 }
317
318 void *
xcalloc(size_t n,size_t s,const char * fmt,...)319 xcalloc(size_t n, size_t s, const char *fmt, ...)
320 {
321 void *p = calloc(n, s);
322
323 if (p == NULL) {
324 if (fmt == NULL)
325 err(1, "calloc");
326 else {
327 va_list va;
328
329 va_start(va, fmt);
330 verr(1, fmt, va);
331 va_end(va);
332 }
333 }
334 return p;
335 }
336
337 void *
xrealloc(void * old,size_t n,const char * fmt,...)338 xrealloc(void *old, size_t n, const char *fmt, ...)
339 {
340 char *p = realloc(old, n);
341
342 if (p == NULL) {
343 free(old);
344 if (fmt == NULL)
345 err(1, "realloc");
346 else {
347 va_list va;
348
349 va_start(va, fmt);
350 verr(1, fmt, va);
351 va_end(va);
352 }
353 }
354 return p;
355 }
356
357 void *
xreallocarray(void * old,size_t s1,size_t s2,const char * fmt,...)358 xreallocarray(void *old, size_t s1, size_t s2, const char *fmt, ...)
359 {
360 void *p = reallocarray(old, s1, s2);
361
362 if (p == NULL) {
363 free(old);
364 if (fmt == NULL)
365 err(1, "reallocarray");
366 else {
367 va_list va;
368
369 va_start(va, fmt);
370 verr(1, fmt, va);
371 va_end(va);
372 }
373 }
374 return p;
375 }
376
377 char *
xstrdup(const char * s)378 xstrdup(const char *s)
379 {
380 char *p = strdup(s);
381 if (p == NULL)
382 err(1, "strdup");
383 return p;
384 }
385
386 void
usage(void)387 usage(void)
388 {
389 fprintf(stderr, "usage: m4 [-EgPs] [-Dname[=value]] [-d flags] "
390 "[-I dirname] [-o filename]\n"
391 "\t[-t macro] [-Uname] [file ...]\n");
392 exit(1);
393 }
394
395 int
obtain_char(struct input_file * f)396 obtain_char(struct input_file *f)
397 {
398 if (f->c == EOF)
399 return EOF;
400
401 f->c = fgetc(f->file);
402 if (f->c == '\n')
403 f->lineno++;
404
405 return f->c;
406 }
407
408 void
set_input(struct input_file * f,FILE * real,const char * name)409 set_input(struct input_file *f, FILE *real, const char *name)
410 {
411 f->file = real;
412 f->lineno = 1;
413 f->c = 0;
414 f->name = xstrdup(name);
415 emit_synchline();
416 }
417
418 void
do_emit_synchline(void)419 do_emit_synchline(void)
420 {
421 fprintf(active, "#line %lu \"%s\"\n",
422 infile[ilevel].lineno, infile[ilevel].name);
423 infile[ilevel].synch_lineno = infile[ilevel].lineno;
424 }
425
426 void
release_input(struct input_file * f)427 release_input(struct input_file *f)
428 {
429 if (ferror(f->file))
430 errx(1, "Fatal error reading from %s\n", f->name);
431 if (f->file != stdin)
432 fclose(f->file);
433 f->c = EOF;
434 /*
435 * XXX can't free filename, as there might still be
436 * error information pointing to it.
437 */
438 }
439
440 void
doprintlineno(struct input_file * f)441 doprintlineno(struct input_file *f)
442 {
443 pbunsigned(f->lineno);
444 }
445
446 void
doprintfilename(struct input_file * f)447 doprintfilename(struct input_file *f)
448 {
449 pbstr(rquote);
450 pbstr(f->name);
451 pbstr(lquote);
452 }
453
454 /*
455 * buffer_mark/dump_buffer: allows one to save a mark in a buffer,
456 * and later dump everything that was added since then to a file.
457 */
458 size_t
buffer_mark(void)459 buffer_mark(void)
460 {
461 return bp - buf;
462 }
463
464
465 void
dump_buffer(FILE * f,size_t m)466 dump_buffer(FILE *f, size_t m)
467 {
468 unsigned char *s;
469
470 for (s = bp; s-buf > (long)m;)
471 fputc(*--s, f);
472 }
473