1 /* $OpenBSD: misc.c,v 1.46 2015/12/07 14:12:46 espie 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 36 #include <sys/cdefs.h> 37 __FBSDID("$FreeBSD$"); 38 39 #include <sys/types.h> 40 #include <errno.h> 41 #include <unistd.h> 42 #include <stdarg.h> 43 #include <stdio.h> 44 #include <stdint.h> 45 #include <stdlib.h> 46 #include <stddef.h> 47 #include <string.h> 48 #include <err.h> 49 #include "mdef.h" 50 #include "stdd.h" 51 #include "extern.h" 52 #include "pathnames.h" 53 54 55 char *ep; /* first free char in strspace */ 56 static char *strspace; /* string space for evaluation */ 57 char *endest; /* end of string space */ 58 static size_t strsize = STRSPMAX; 59 static size_t bufsize = BUFSIZE; 60 61 unsigned char *buf; /* push-back buffer */ 62 unsigned char *bufbase; /* the base for current ilevel */ 63 unsigned char *bbase[MAXINP]; /* the base for each ilevel */ 64 unsigned char *bp; /* first available character */ 65 unsigned char *endpbb; /* end of push-back buffer */ 66 67 68 /* 69 * find the index of second str in the first str. 70 */ 71 ptrdiff_t 72 indx(const char *s1, const char *s2) 73 { 74 char *t; 75 76 t = strstr(s1, s2); 77 if (t == NULL) 78 return (-1); 79 else 80 return (t - s1); 81 } 82 /* 83 * pushback - push character back onto input 84 */ 85 void 86 pushback(int c) 87 { 88 if (c == EOF) 89 return; 90 if (bp >= endpbb) 91 enlarge_bufspace(); 92 *bp++ = c; 93 } 94 95 /* 96 * pbstr - push string back onto input 97 * pushback is replicated to improve 98 * performance. 99 */ 100 void 101 pbstr(const char *s) 102 { 103 size_t n; 104 105 n = strlen(s); 106 while (endpbb - bp <= (long)n) 107 enlarge_bufspace(); 108 while (n > 0) 109 *bp++ = s[--n]; 110 } 111 112 /* 113 * pbnum - convert number to string, push back on input. 114 */ 115 void 116 pbnum(int n) 117 { 118 pbnumbase(n, 10, 0); 119 } 120 121 void 122 pbnumbase(int n, int base, int d) 123 { 124 static char digits[36] = "0123456789abcdefghijklmnopqrstuvwxyz"; 125 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 if (n < 0) 142 printed++; 143 while (printed++ < d) 144 pushback('0'); 145 146 if (n < 0) 147 pushback('-'); 148 } 149 150 /* 151 * pbunsigned - convert unsigned long to string, push back on input. 152 */ 153 void 154 pbunsigned(unsigned long n) 155 { 156 do { 157 pushback(n % 10 + '0'); 158 } 159 while ((n /= 10) > 0); 160 } 161 162 void 163 initspaces(void) 164 { 165 int i; 166 167 strspace = xalloc(strsize+1, NULL); 168 ep = strspace; 169 endest = strspace+strsize; 170 buf = xalloc(bufsize, NULL); 171 bufbase = buf; 172 bp = buf; 173 endpbb = buf + bufsize; 174 for (i = 0; i < MAXINP; i++) 175 bbase[i] = buf; 176 } 177 178 void 179 enlarge_strspace(void) 180 { 181 char *newstrspace; 182 int i; 183 184 strsize *= 2; 185 newstrspace = malloc(strsize + 1); 186 if (!newstrspace) 187 errx(1, "string space overflow"); 188 memcpy(newstrspace, strspace, strsize/2); 189 for (i = 0; i <= sp; i++) 190 if (sstack[i] == STORAGE_STRSPACE) 191 mstack[i].sstr = (mstack[i].sstr - strspace) 192 + newstrspace; 193 ep = (ep-strspace) + newstrspace; 194 free(strspace); 195 strspace = newstrspace; 196 endest = strspace + strsize; 197 } 198 199 void 200 enlarge_bufspace(void) 201 { 202 unsigned char *newbuf; 203 int i; 204 205 bufsize += bufsize/2; 206 newbuf = xrealloc(buf, bufsize, "too many characters pushed back"); 207 for (i = 0; i < MAXINP; i++) 208 bbase[i] = (bbase[i]-buf)+newbuf; 209 bp = (bp-buf)+newbuf; 210 bufbase = (bufbase-buf)+newbuf; 211 buf = newbuf; 212 endpbb = buf+bufsize; 213 } 214 215 /* 216 * chrsave - put single char on string space 217 */ 218 void 219 chrsave(int c) 220 { 221 if (ep >= endest) 222 enlarge_strspace(); 223 *ep++ = c; 224 } 225 226 /* 227 * read in a diversion file, and dispose it. 228 */ 229 void 230 getdiv(int n) 231 { 232 int c; 233 234 if (active == outfile[n]) 235 m4errx(1, "undivert: diversion still active."); 236 rewind(outfile[n]); 237 while ((c = getc(outfile[n])) != EOF) 238 putc(c, active); 239 (void) fclose(outfile[n]); 240 outfile[n] = NULL; 241 } 242 243 void 244 onintr(int signo __unused) 245 { 246 #define intrmessage "m4: interrupted.\n" 247 write(STDERR_FILENO, intrmessage, sizeof(intrmessage)-1); 248 _exit(1); 249 } 250 251 /* 252 * killdiv - get rid of the diversion files 253 */ 254 void 255 killdiv(void) 256 { 257 int n; 258 259 for (n = 0; n < maxout; n++) 260 if (outfile[n] != NULL) { 261 (void) fclose(outfile[n]); 262 } 263 } 264 265 extern char *__progname; 266 267 void 268 m4errx(int eval, const char *fmt, ...) 269 { 270 fprintf(stderr, "%s: ", __progname); 271 fprintf(stderr, "%s at line %lu: ", CURRENT_NAME, CURRENT_LINE); 272 if (fmt != NULL) { 273 va_list ap; 274 275 va_start(ap, fmt); 276 vfprintf(stderr, fmt, ap); 277 va_end(ap); 278 } 279 fprintf(stderr, "\n"); 280 exit(eval); 281 } 282 283 /* 284 * resizedivs: allocate more diversion files */ 285 void 286 resizedivs(int n) 287 { 288 int i; 289 290 outfile = xreallocarray(outfile, n, sizeof(FILE *), 291 "too many diverts %d", n); 292 for (i = maxout; i < n; i++) 293 outfile[i] = NULL; 294 maxout = n; 295 } 296 297 void * 298 xalloc(size_t n, const char *fmt, ...) 299 { 300 void *p = malloc(n); 301 302 if (p == NULL) { 303 if (fmt == NULL) 304 err(1, "malloc"); 305 else { 306 va_list va; 307 308 va_start(va, fmt); 309 verr(1, fmt, va); 310 va_end(va); 311 } 312 } 313 return p; 314 } 315 316 void * 317 xcalloc(size_t n, size_t s, const char *fmt, ...) 318 { 319 void *p = calloc(n, s); 320 321 if (p == NULL) { 322 if (fmt == NULL) 323 err(1, "calloc"); 324 else { 325 va_list va; 326 327 va_start(va, fmt); 328 verr(1, fmt, va); 329 va_end(va); 330 } 331 } 332 return p; 333 } 334 335 void * 336 xrealloc(void *old, size_t n, const char *fmt, ...) 337 { 338 char *p = realloc(old, n); 339 340 if (p == NULL) { 341 free(old); 342 if (fmt == NULL) 343 err(1, "realloc"); 344 else { 345 va_list va; 346 347 va_start(va, fmt); 348 verr(1, fmt, va); 349 va_end(va); 350 } 351 } 352 return p; 353 } 354 355 void * 356 xreallocarray(void *old, size_t s1, size_t s2, const char *fmt, ...) 357 { 358 void *p = reallocarray(old, s1, s2); 359 360 if (p == NULL) { 361 free(old); 362 if (fmt == NULL) 363 err(1, "reallocarray"); 364 else { 365 va_list va; 366 367 va_start(va, fmt); 368 verr(1, fmt, va); 369 va_end(va); 370 } 371 } 372 return p; 373 } 374 375 char * 376 xstrdup(const char *s) 377 { 378 char *p = strdup(s); 379 if (p == NULL) 380 err(1, "strdup"); 381 return p; 382 } 383 384 void 385 usage(void) 386 { 387 fprintf(stderr, "usage: m4 [-gPs] [-Dname[=value]] [-d flags] " 388 "[-I dirname] [-o filename]\n" 389 "\t[-t macro] [-Uname] [file ...]\n"); 390 exit(1); 391 } 392 393 int 394 obtain_char(struct input_file *f) 395 { 396 if (f->c == EOF) 397 return EOF; 398 399 f->c = fgetc(f->file); 400 if (f->c == '\n') 401 f->lineno++; 402 403 return f->c; 404 } 405 406 void 407 set_input(struct input_file *f, FILE *real, const char *name) 408 { 409 f->file = real; 410 f->lineno = 1; 411 f->c = 0; 412 f->name = xstrdup(name); 413 emit_synchline(); 414 } 415 416 void 417 do_emit_synchline(void) 418 { 419 fprintf(active, "#line %lu \"%s\"\n", 420 infile[ilevel].lineno, infile[ilevel].name); 421 infile[ilevel].synch_lineno = infile[ilevel].lineno; 422 } 423 424 void 425 release_input(struct input_file *f) 426 { 427 if (ferror(f->file)) 428 errx(1, "Fatal error reading from %s\n", f->name); 429 if (f->file != stdin) 430 fclose(f->file); 431 f->c = EOF; 432 /* 433 * XXX can't free filename, as there might still be 434 * error information pointing to it. 435 */ 436 } 437 438 void 439 doprintlineno(struct input_file *f) 440 { 441 pbunsigned(f->lineno); 442 } 443 444 void 445 doprintfilename(struct input_file *f) 446 { 447 pbstr(rquote); 448 pbstr(f->name); 449 pbstr(lquote); 450 } 451 452 /* 453 * buffer_mark/dump_buffer: allows one to save a mark in a buffer, 454 * and later dump everything that was added since then to a file. 455 */ 456 size_t 457 buffer_mark(void) 458 { 459 return bp - buf; 460 } 461 462 463 void 464 dump_buffer(FILE *f, size_t m) 465 { 466 unsigned char *s; 467 468 for (s = bp; s-buf > (long)m;) 469 fputc(*--s, f); 470 } 471