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] = "0123456789abcdefghijklmnopqrstuvwxyz";
124 int num;
125 int printed = 0;
126
127 if (base > 36)
128 m4errx(1, "base %d > 36: not supported.", base);
129
130 if (base < 2)
131 m4errx(1, "bad base %d for conversion.", base);
132
133 num = (n < 0) ? -n : n;
134 do {
135 pushback(digits[num % base]);
136 printed++;
137 }
138 while ((num /= base) > 0);
139
140 if (n < 0)
141 printed++;
142 while (printed++ < d)
143 pushback('0');
144
145 if (n < 0)
146 pushback('-');
147 }
148
149 /*
150 * pbunsigned - convert unsigned long to string, push back on input.
151 */
152 void
pbunsigned(unsigned long n)153 pbunsigned(unsigned long n)
154 {
155 do {
156 pushback(n % 10 + '0');
157 }
158 while ((n /= 10) > 0);
159 }
160
161 void
initspaces(void)162 initspaces(void)
163 {
164 int i;
165
166 strspace = xalloc(strsize+1, NULL);
167 ep = strspace;
168 endest = strspace+strsize;
169 buf = xalloc(bufsize, NULL);
170 bufbase = buf;
171 bp = buf;
172 endpbb = buf + bufsize;
173 for (i = 0; i < MAXINP; i++)
174 bbase[i] = buf;
175 }
176
177 void
enlarge_strspace(void)178 enlarge_strspace(void)
179 {
180 char *newstrspace;
181 int i;
182
183 strsize *= 2;
184 newstrspace = malloc(strsize + 1);
185 if (!newstrspace)
186 errx(1, "string space overflow");
187 memcpy(newstrspace, strspace, strsize/2);
188 for (i = 0; i <= sp; i++)
189 if (sstack[i] == STORAGE_STRSPACE)
190 mstack[i].sstr = (mstack[i].sstr - strspace)
191 + newstrspace;
192 ep = (ep-strspace) + newstrspace;
193 free(strspace);
194 strspace = newstrspace;
195 endest = strspace + strsize;
196 }
197
198 void
enlarge_bufspace(void)199 enlarge_bufspace(void)
200 {
201 unsigned char *newbuf;
202 int i;
203
204 bufsize += bufsize/2;
205 newbuf = xrealloc(buf, bufsize, "too many characters pushed back");
206 for (i = 0; i < MAXINP; i++)
207 bbase[i] = (bbase[i]-buf)+newbuf;
208 bp = (bp-buf)+newbuf;
209 bufbase = (bufbase-buf)+newbuf;
210 buf = newbuf;
211 endpbb = buf+bufsize;
212 }
213
214 /*
215 * chrsave - put single char on string space
216 */
217 void
chrsave(int c)218 chrsave(int c)
219 {
220 if (ep >= endest)
221 enlarge_strspace();
222 *ep++ = c;
223 }
224
225 /*
226 * read in a diversion file, and dispose it.
227 */
228 void
getdiv(int n)229 getdiv(int n)
230 {
231 int c;
232
233 if (active == outfile[n])
234 m4errx(1, "undivert: diversion still active.");
235 rewind(outfile[n]);
236 while ((c = getc(outfile[n])) != EOF)
237 putc(c, active);
238 (void) fclose(outfile[n]);
239 outfile[n] = NULL;
240 }
241
242 void
onintr(int signo __unused)243 onintr(int signo __unused)
244 {
245 #define intrmessage "m4: interrupted.\n"
246 write(STDERR_FILENO, intrmessage, sizeof(intrmessage)-1);
247 _exit(1);
248 }
249
250 /*
251 * killdiv - get rid of the diversion files
252 */
253 void
killdiv(void)254 killdiv(void)
255 {
256 int n;
257
258 for (n = 0; n < maxout; n++)
259 if (outfile[n] != NULL) {
260 (void) fclose(outfile[n]);
261 }
262 }
263
264 extern char *__progname;
265
266 void
m4errx(int eval,const char * fmt,...)267 m4errx(int eval, const char *fmt, ...)
268 {
269 fprintf(stderr, "%s: ", __progname);
270 fprintf(stderr, "%s at line %lu: ", CURRENT_NAME, CURRENT_LINE);
271 if (fmt != NULL) {
272 va_list ap;
273
274 va_start(ap, fmt);
275 vfprintf(stderr, fmt, ap);
276 va_end(ap);
277 }
278 fprintf(stderr, "\n");
279 exit(eval);
280 }
281
282 /*
283 * resizedivs: allocate more diversion files */
284 void
resizedivs(int n)285 resizedivs(int n)
286 {
287 int i;
288
289 outfile = xreallocarray(outfile, n, sizeof(FILE *),
290 "too many diverts %d", n);
291 for (i = maxout; i < n; i++)
292 outfile[i] = NULL;
293 maxout = n;
294 }
295
296 void *
xalloc(size_t n,const char * fmt,...)297 xalloc(size_t n, const char *fmt, ...)
298 {
299 void *p = malloc(n);
300
301 if (p == NULL) {
302 if (fmt == NULL)
303 err(1, "malloc");
304 else {
305 va_list va;
306
307 va_start(va, fmt);
308 verr(1, fmt, va);
309 va_end(va);
310 }
311 }
312 return p;
313 }
314
315 void *
xcalloc(size_t n,size_t s,const char * fmt,...)316 xcalloc(size_t n, size_t s, const char *fmt, ...)
317 {
318 void *p = calloc(n, s);
319
320 if (p == NULL) {
321 if (fmt == NULL)
322 err(1, "calloc");
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 void *
xrealloc(void * old,size_t n,const char * fmt,...)335 xrealloc(void *old, size_t n, const char *fmt, ...)
336 {
337 char *p = realloc(old, n);
338
339 if (p == NULL) {
340 free(old);
341 if (fmt == NULL)
342 err(1, "realloc");
343 else {
344 va_list va;
345
346 va_start(va, fmt);
347 verr(1, fmt, va);
348 va_end(va);
349 }
350 }
351 return p;
352 }
353
354 void *
xreallocarray(void * old,size_t s1,size_t s2,const char * fmt,...)355 xreallocarray(void *old, size_t s1, size_t s2, const char *fmt, ...)
356 {
357 void *p = reallocarray(old, s1, s2);
358
359 if (p == NULL) {
360 free(old);
361 if (fmt == NULL)
362 err(1, "reallocarray");
363 else {
364 va_list va;
365
366 va_start(va, fmt);
367 verr(1, fmt, va);
368 va_end(va);
369 }
370 }
371 return p;
372 }
373
374 char *
xstrdup(const char * s)375 xstrdup(const char *s)
376 {
377 char *p = strdup(s);
378 if (p == NULL)
379 err(1, "strdup");
380 return p;
381 }
382
383 void
usage(void)384 usage(void)
385 {
386 fprintf(stderr, "usage: m4 [-EgPs] [-Dname[=value]] [-d flags] "
387 "[-I dirname] [-o filename]\n"
388 "\t[-t macro] [-Uname] [file ...]\n");
389 exit(1);
390 }
391
392 int
obtain_char(struct input_file * f)393 obtain_char(struct input_file *f)
394 {
395 if (f->c == EOF)
396 return EOF;
397
398 f->c = fgetc(f->file);
399 if (f->c == '\n')
400 f->lineno++;
401
402 return f->c;
403 }
404
405 void
set_input(struct input_file * f,FILE * real,const char * name)406 set_input(struct input_file *f, FILE *real, const char *name)
407 {
408 f->file = real;
409 f->lineno = 1;
410 f->c = 0;
411 f->name = xstrdup(name);
412 emit_synchline();
413 }
414
415 void
do_emit_synchline(void)416 do_emit_synchline(void)
417 {
418 fprintf(active, "#line %lu \"%s\"\n",
419 infile[ilevel].lineno, infile[ilevel].name);
420 infile[ilevel].synch_lineno = infile[ilevel].lineno;
421 }
422
423 void
release_input(struct input_file * f)424 release_input(struct input_file *f)
425 {
426 if (ferror(f->file))
427 errx(1, "Fatal error reading from %s\n", f->name);
428 if (f->file != stdin)
429 fclose(f->file);
430 f->c = EOF;
431 /*
432 * XXX can't free filename, as there might still be
433 * error information pointing to it.
434 */
435 }
436
437 void
doprintlineno(struct input_file * f)438 doprintlineno(struct input_file *f)
439 {
440 pbunsigned(f->lineno);
441 }
442
443 void
doprintfilename(struct input_file * f)444 doprintfilename(struct input_file *f)
445 {
446 pbstr(rquote);
447 pbstr(f->name);
448 pbstr(lquote);
449 }
450
451 /*
452 * buffer_mark/dump_buffer: allows one to save a mark in a buffer,
453 * and later dump everything that was added since then to a file.
454 */
455 size_t
buffer_mark(void)456 buffer_mark(void)
457 {
458 return bp - buf;
459 }
460
461
462 void
dump_buffer(FILE * f,size_t m)463 dump_buffer(FILE *f, size_t m)
464 {
465 unsigned char *s;
466
467 for (s = bp; s-buf > (long)m;)
468 fputc(*--s, f);
469 }
470