1 /* $OpenBSD: misc.c,v 1.27 2002/04/26 16:15:16 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. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the University of 22 * California, Berkeley and its contributors. 23 * 4. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 * 39 * @(#)misc.c 8.1 (Berkeley) 6/6/93 40 * $OpenBSD: misc.c,v 1.27 2002/04/26 16:15:16 espie Exp $ 41 * $FreeBSD: src/usr.bin/m4/misc.c,v 1.5.2.4 2002/07/15 02:06:15 jmallett Exp $ 42 * $DragonFly: src/usr.bin/m4/misc.c,v 1.2 2003/06/17 04:29:28 dillon Exp $ 43 */ 44 45 #include <sys/types.h> 46 #include <errno.h> 47 #include <unistd.h> 48 #include <stdio.h> 49 #include <stdlib.h> 50 #include <stddef.h> 51 #include <string.h> 52 #include <err.h> 53 #include "mdef.h" 54 #include "stdd.h" 55 #include "extern.h" 56 #include "pathnames.h" 57 58 59 char *ep; /* first free char in strspace */ 60 static char *strspace; /* string space for evaluation */ 61 char *endest; /* end of string space */ 62 static size_t strsize = STRSPMAX; 63 static size_t bufsize = BUFSIZE; 64 65 char *buf; /* push-back buffer */ 66 char *bufbase; /* the base for current ilevel */ 67 char *bbase[MAXINP]; /* the base for each ilevel */ 68 char *bp; /* first available character */ 69 char *endpbb; /* end of push-back buffer */ 70 71 72 /* 73 * find the index of second str in the first str. 74 */ 75 ptrdiff_t 76 indx(const char *s1, const char *s2) 77 { 78 char *t; 79 80 t = strstr(s1, s2); 81 if (t == NULL) 82 return (-1); 83 else 84 return (t - s1); 85 } 86 /* 87 * putback - push character back onto input 88 */ 89 void 90 putback(int c) 91 { 92 if (c == EOF) 93 return; 94 if (bp >= endpbb) 95 enlarge_bufspace(); 96 *bp++ = c; 97 } 98 99 /* 100 * pbstr - push string back onto input 101 * putback is replicated to improve 102 * performance. 103 */ 104 void 105 pbstr(const char *s) 106 { 107 size_t n; 108 109 n = strlen(s); 110 while ((size_t)(endpbb - bp) <= n) 111 enlarge_bufspace(); 112 while (n > 0) 113 *bp++ = s[--n]; 114 } 115 116 /* 117 * pbnum - convert number to string, push back on input. 118 */ 119 void 120 pbnum(int n) 121 { 122 int num; 123 124 num = (n < 0) ? -n : n; 125 do { 126 putback(num % 10 + '0'); 127 } 128 while ((num /= 10) > 0); 129 130 if (n < 0) 131 putback('-'); 132 } 133 134 /* 135 * pbunsigned - convert unsigned long to string, push back on input. 136 */ 137 void 138 pbunsigned(unsigned long n) 139 { 140 do { 141 putback(n % 10 + '0'); 142 } 143 while ((n /= 10) > 0); 144 } 145 146 void 147 initspaces(void) 148 { 149 int i; 150 151 strspace = xalloc(strsize+1); 152 ep = strspace; 153 endest = strspace+strsize; 154 buf = (char *)xalloc(bufsize); 155 bufbase = buf; 156 bp = buf; 157 endpbb = buf + bufsize; 158 for (i = 0; i < MAXINP; i++) 159 bbase[i] = buf; 160 } 161 162 void 163 enlarge_strspace(void) 164 { 165 char *newstrspace; 166 int i; 167 168 strsize *= 2; 169 newstrspace = malloc(strsize + 1); 170 if (!newstrspace) 171 errx(1, "string space overflow"); 172 memcpy(newstrspace, strspace, strsize/2); 173 for (i = 0; i <= sp; i++) 174 if (sstack[i]) 175 mstack[i].sstr = (mstack[i].sstr - strspace) 176 + newstrspace; 177 ep = (ep-strspace) + newstrspace; 178 free(strspace); 179 strspace = newstrspace; 180 endest = strspace + strsize; 181 } 182 183 void 184 enlarge_bufspace(void) 185 { 186 char *newbuf; 187 int i; 188 189 bufsize *= 2; 190 newbuf = realloc(buf, bufsize); 191 if (!newbuf) 192 errx(1, "too many characters pushed back"); 193 for (i = 0; i < MAXINP; i++) 194 bbase[i] = (bbase[i]-buf)+newbuf; 195 bp = (bp-buf)+newbuf; 196 bufbase = (bufbase-buf)+newbuf; 197 buf = newbuf; 198 endpbb = buf+bufsize; 199 } 200 201 /* 202 * chrsave - put single char on string space 203 */ 204 void 205 chrsave(int c) 206 { 207 if (ep >= endest) 208 enlarge_strspace(); 209 *ep++ = c; 210 } 211 212 /* 213 * read in a diversion file, and dispose it. 214 */ 215 void 216 getdiv(int n) 217 { 218 int c; 219 220 if (active == outfile[n]) 221 errx(1, "undivert: diversion still active"); 222 rewind(outfile[n]); 223 while ((c = getc(outfile[n])) != EOF) 224 putc(c, active); 225 (void) fclose(outfile[n]); 226 outfile[n] = NULL; 227 } 228 229 void 230 onintr(int signo __unused) 231 { 232 #define intrmessage "m4: interrupted.\n" 233 write(STDERR_FILENO, intrmessage, sizeof(intrmessage)-1); 234 _exit(1); 235 } 236 237 /* 238 * killdiv - get rid of the diversion files 239 */ 240 void 241 killdiv(void) 242 { 243 int n; 244 245 for (n = 0; n < maxout; n++) 246 if (outfile[n] != NULL) { 247 (void) fclose(outfile[n]); 248 } 249 } 250 251 /* 252 * resizedivs: allocate more diversion files */ 253 void 254 resizedivs(int n) 255 { 256 int i; 257 258 outfile = (FILE **)realloc(outfile, sizeof(FILE *) * n); 259 if (outfile == NULL) 260 errx(1, "too many diverts %d", n); 261 for (i = maxout; i < n; i++) 262 outfile[i] = NULL; 263 maxout = n; 264 } 265 266 void * 267 xalloc(size_t n) 268 { 269 char *p = malloc(n); 270 271 if (p == NULL) 272 err(1, "malloc"); 273 return p; 274 } 275 276 char * 277 xstrdup(const char *s) 278 { 279 char *p = strdup(s); 280 if (p == NULL) 281 err(1, "strdup"); 282 return p; 283 } 284 285 void 286 usage(void) 287 { 288 fprintf(stderr, 289 "usage: m4 [-d flags] [-t name] [-gs] [-D name[=value]]...\n" 290 " [-U name]... [-I dirname]... file...\n"); 291 exit(1); 292 } 293 294 int 295 obtain_char(struct input_file *f) 296 { 297 if (f->c == EOF) 298 return EOF; 299 else if (f->c == '\n') 300 f->lineno++; 301 302 f->c = fgetc(f->file); 303 return f->c; 304 } 305 306 void 307 set_input(struct input_file *f, FILE *real, const char *name) 308 { 309 f->file = real; 310 f->lineno = 1; 311 f->c = 0; 312 f->name = xstrdup(name); 313 } 314 315 void 316 release_input(struct input_file *f) 317 { 318 if (f->file != stdin) 319 fclose(f->file); 320 f->c = EOF; 321 /* 322 * XXX can't free filename, as there might still be 323 * error information pointing to it. 324 */ 325 } 326 327 void 328 doprintlineno(struct input_file *f) 329 { 330 pbunsigned(f->lineno); 331 } 332 333 void 334 doprintfilename(struct input_file *f) 335 { 336 pbstr(rquote); 337 pbstr(f->name); 338 pbstr(lquote); 339 } 340 341 /* 342 * buffer_mark/dump_buffer: allows one to save a mark in a buffer, 343 * and later dump everything that was added since then to a file. 344 */ 345 size_t 346 buffer_mark(void) 347 { 348 return bp - buf; 349 } 350 351 352 void 353 dump_buffer(FILE *f, size_t m) 354 { 355 char *s; 356 357 for (s = bp; s - buf > (int)m;) 358 fputc(*--s, f); 359 } 360