1 /* $NetBSD: parse.c,v 1.18 2006/01/04 01:30:21 perry Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #if HAVE_NBTOOL_CONFIG_H 33 #include "nbtool_config.h" 34 #endif 35 36 #include <sys/cdefs.h> 37 #if !defined(lint) 38 #if 0 39 static char sccsid[] = "@(#)parse.c 8.1 (Berkeley) 6/6/93"; 40 #else 41 __RCSID("$NetBSD: parse.c,v 1.18 2006/01/04 01:30:21 perry Exp $"); 42 #endif 43 #endif /* not lint */ 44 45 #include <sys/types.h> 46 #include <sys/file.h> 47 48 #include <ctype.h> 49 #include <err.h> 50 #include <errno.h> 51 #include <fcntl.h> 52 #include <stdio.h> 53 #include <stdlib.h> 54 #include <string.h> 55 56 #include "hexdump.h" 57 58 FU *endfu; /* format at end-of-data */ 59 60 void 61 addfile(char *name) 62 { 63 char *p; 64 FILE *fp; 65 int ch; 66 char buf[2048 + 1]; 67 68 if ((fp = fopen(name, "r")) == NULL) 69 err(1, "fopen %s", name); 70 while (fgets(buf, sizeof(buf), fp)) { 71 if (!(p = strchr(buf, '\n'))) { 72 warnx("line too long."); 73 while ((ch = getchar()) != '\n' && ch != EOF); 74 continue; 75 } 76 *p = '\0'; 77 for (p = buf; *p && isspace((unsigned char)*p); ++p); 78 if (!*p || *p == '#') 79 continue; 80 add(p); 81 } 82 (void)fclose(fp); 83 } 84 85 void 86 add(const char *fmt) 87 { 88 const char *p; 89 static FS **nextfs; 90 FS *tfs; 91 FU *tfu, **nextfu; 92 const char *savep; 93 94 /* start new linked list of format units */ 95 tfs = emalloc(sizeof(FS)); 96 if (!fshead) 97 fshead = tfs; 98 else 99 *nextfs = tfs; 100 nextfs = &tfs->nextfs; 101 nextfu = &tfs->nextfu; 102 103 /* take the format string and break it up into format units */ 104 for (p = fmt;;) { 105 /* skip leading white space */ 106 for (; isspace((unsigned char)*p); ++p); 107 if (!*p) 108 break; 109 110 /* allocate a new format unit and link it in */ 111 tfu = emalloc(sizeof(FU)); 112 *nextfu = tfu; 113 nextfu = &tfu->nextfu; 114 tfu->reps = 1; 115 116 /* if leading digit, repetition count */ 117 if (isdigit((unsigned char)*p)) { 118 for (savep = p; isdigit((unsigned char)*p); ++p); 119 if (!isspace((unsigned char)*p) && *p != '/') 120 badfmt(fmt); 121 /* may overwrite either white space or slash */ 122 tfu->reps = atoi(savep); 123 tfu->flags = F_SETREP; 124 /* skip trailing white space */ 125 for (++p; isspace((unsigned char)*p); ++p); 126 } 127 128 /* skip slash and trailing white space */ 129 if (*p == '/') 130 while (isspace((unsigned char)*++p)); 131 132 /* byte count */ 133 if (isdigit((unsigned char)*p)) { 134 for (savep = p; isdigit((unsigned char)*p); ++p); 135 if (!isspace((unsigned char)*p)) 136 badfmt(fmt); 137 tfu->bcnt = atoi(savep); 138 /* skip trailing white space */ 139 for (++p; isspace((unsigned char)*p); ++p); 140 } 141 142 /* format */ 143 if (*p != '"') 144 badfmt(fmt); 145 for (savep = ++p; *p != '"';) 146 if (*p++ == 0) 147 badfmt(fmt); 148 if (!(tfu->fmt = malloc(p - savep + 1))) 149 nomem(); 150 (void) strncpy(tfu->fmt, savep, p - savep); 151 tfu->fmt[p - savep] = '\0'; 152 escape(tfu->fmt); 153 p++; 154 } 155 } 156 157 static const char *spec = ".#-+ 0123456789"; 158 159 int 160 size(FS *fs) 161 { 162 FU *fu; 163 int bcnt, cursize; 164 char *fmt; 165 int prec; 166 167 /* figure out the data block size needed for each format unit */ 168 for (cursize = 0, fu = fs->nextfu; fu; fu = fu->nextfu) { 169 if (fu->bcnt) { 170 cursize += fu->bcnt * fu->reps; 171 continue; 172 } 173 for (bcnt = prec = 0, fmt = fu->fmt; *fmt; ++fmt) { 174 if (*fmt != '%') 175 continue; 176 /* 177 * skip any special chars -- save precision in 178 * case it's a %s format. 179 */ 180 while (strchr(spec + 1, *++fmt)); 181 if (*fmt == '.' && isdigit((unsigned char)*++fmt)) { 182 prec = atoi(fmt); 183 while (isdigit((unsigned char)*++fmt)); 184 } 185 switch(*fmt) { 186 case 'c': 187 bcnt += 1; 188 break; 189 case 'd': case 'i': case 'o': case 'u': 190 case 'x': case 'X': 191 bcnt += 4; 192 break; 193 case 'e': case 'E': case 'f': case 'g': case 'G': 194 bcnt += 8; 195 break; 196 case 's': 197 bcnt += prec; 198 break; 199 case '_': 200 switch(*++fmt) { 201 case 'c': case 'p': case 'u': 202 bcnt += 1; 203 break; 204 } 205 } 206 } 207 cursize += bcnt * fu->reps; 208 } 209 return (cursize); 210 } 211 212 void 213 rewrite(FS *fs) 214 { 215 enum { NOTOKAY, USEBCNT, USEPREC } sokay; 216 PR *pr, **nextpr; 217 FU *fu; 218 char *p1, *p2; 219 char savech, *fmtp, cs[3]; 220 int nconv, prec; 221 222 nextpr = NULL; 223 prec = 0; 224 for (fu = fs->nextfu; fu; fu = fu->nextfu) { 225 /* 226 * Break each format unit into print units; each conversion 227 * character gets its own. 228 */ 229 for (nconv = 0, fmtp = fu->fmt; *fmtp; nextpr = &pr->nextpr) { 230 pr = emalloc(sizeof(PR)); 231 if (!fu->nextpr) 232 fu->nextpr = pr; 233 else 234 *nextpr = pr; 235 236 /* Skip preceding text and up to the next % sign. */ 237 for (p1 = fmtp; *p1 && *p1 != '%'; ++p1); 238 239 /* Only text in the string. */ 240 if (!*p1) { 241 pr->fmt = fmtp; 242 pr->flags = F_TEXT; 243 break; 244 } 245 246 /* 247 * Get precision for %s -- if have a byte count, don't 248 * need it. 249 */ 250 if (fu->bcnt) { 251 sokay = USEBCNT; 252 /* Skip to conversion character. */ 253 for (++p1; strchr(spec, *p1); ++p1); 254 } else { 255 /* Skip any special chars, field width. */ 256 while (strchr(spec + 1, *++p1)); 257 if (*p1 == '.' && 258 isdigit((unsigned char)*++p1)) { 259 sokay = USEPREC; 260 prec = atoi(p1); 261 while (isdigit((unsigned char)*++p1)) 262 continue; 263 } else 264 sokay = NOTOKAY; 265 } 266 267 p2 = p1 + 1; /* Set end pointer. */ 268 cs[0] = *p1; /* Set conversion string. */ 269 cs[1] = '\0'; 270 271 /* 272 * Figure out the byte count for each conversion; 273 * rewrite the format as necessary, set up blank- 274 * padding for end of data. 275 */ 276 switch(cs[0]) { 277 case 'c': 278 pr->flags = F_CHAR; 279 switch(fu->bcnt) { 280 case 0: case 1: 281 pr->bcnt = 1; 282 break; 283 default: 284 p1[1] = '\0'; 285 badcnt(p1); 286 } 287 break; 288 case 'd': case 'i': 289 pr->flags = F_INT; 290 goto isint; 291 case 'o': case 'u': case 'x': case 'X': 292 pr->flags = F_UINT; 293 isint: cs[2] = '\0'; 294 cs[1] = cs[0]; 295 cs[0] = 'q'; 296 switch(fu->bcnt) { 297 case 0: case 4: 298 pr->bcnt = 4; 299 break; 300 case 1: 301 pr->bcnt = 1; 302 break; 303 case 2: 304 pr->bcnt = 2; 305 break; 306 case 8: 307 pr->bcnt = 8; 308 break; 309 default: 310 p1[1] = '\0'; 311 badcnt(p1); 312 } 313 break; 314 case 'e': case 'E': case 'f': case 'g': case 'G': 315 pr->flags = F_DBL; 316 switch(fu->bcnt) { 317 case 0: case 8: 318 pr->bcnt = 8; 319 break; 320 case 4: 321 pr->bcnt = 4; 322 break; 323 default: 324 p1[1] = '\0'; 325 badcnt(p1); 326 } 327 break; 328 case 's': 329 pr->flags = F_STR; 330 switch(sokay) { 331 case NOTOKAY: 332 badsfmt(); 333 case USEBCNT: 334 pr->bcnt = fu->bcnt; 335 break; 336 case USEPREC: 337 pr->bcnt = prec; 338 break; 339 } 340 break; 341 case '_': 342 ++p2; 343 switch(p1[1]) { 344 case 'A': 345 endfu = fu; 346 fu->flags |= F_IGNORE; 347 /* FALLTHROUGH */ 348 case 'a': 349 pr->flags = F_ADDRESS; 350 ++p2; 351 switch(p1[2]) { 352 case 'd': case 'o': case'x': 353 cs[0] = 'q'; 354 cs[1] = p1[2]; 355 cs[2] = '\0'; 356 break; 357 default: 358 p1[3] = '\0'; 359 badconv(p1); 360 } 361 break; 362 case 'c': 363 pr->flags = F_C; 364 /* cs[0] = 'c'; set in conv_c */ 365 goto isint2; 366 case 'p': 367 pr->flags = F_P; 368 cs[0] = 'c'; 369 goto isint2; 370 case 'u': 371 pr->flags = F_U; 372 /* cs[0] = 'c'; set in conv_u */ 373 isint2: switch(fu->bcnt) { 374 case 0: case 1: 375 pr->bcnt = 1; 376 break; 377 default: 378 p1[2] = '\0'; 379 badcnt(p1); 380 } 381 break; 382 default: 383 p1[2] = '\0'; 384 badconv(p1); 385 } 386 break; 387 default: 388 p1[1] = '\0'; 389 badconv(p1); 390 } 391 392 /* 393 * Copy to PR format string, set conversion character 394 * pointer, update original. 395 */ 396 savech = *p2; 397 p1[0] = '\0'; 398 pr->fmt = emalloc(strlen(fmtp) + strlen(cs) + 1); 399 (void)strcpy(pr->fmt, fmtp); 400 (void)strcat(pr->fmt, cs); 401 *p2 = savech; 402 pr->cchar = pr->fmt + (p1 - fmtp); 403 fmtp = p2; 404 405 /* Only one conversion character if byte count. */ 406 if (!(pr->flags&F_ADDRESS) && fu->bcnt && nconv++) 407 errx(1, 408 "byte count with multiple conversion characters"); 409 } 410 /* 411 * If format unit byte count not specified, figure it out 412 * so can adjust rep count later. 413 */ 414 if (!fu->bcnt) 415 for (pr = fu->nextpr; pr; pr = pr->nextpr) 416 fu->bcnt += pr->bcnt; 417 } 418 /* 419 * If the format string interprets any data at all, and it's 420 * not the same as the blocksize, and its last format unit 421 * interprets any data at all, and has no iteration count, 422 * repeat it as necessary. 423 * 424 * If, rep count is greater than 1, no trailing whitespace 425 * gets output from the last iteration of the format unit. 426 */ 427 for (fu = fs->nextfu; fu; fu = fu->nextfu) { 428 if (!fu->nextfu && fs->bcnt < blocksize && 429 !(fu->flags&F_SETREP) && fu->bcnt) 430 fu->reps += (blocksize - fs->bcnt) / fu->bcnt; 431 if (fu->reps > 1) { 432 for (pr = fu->nextpr;; pr = pr->nextpr) 433 if (!pr->nextpr) 434 break; 435 for (p1 = pr->fmt, p2 = NULL; *p1; ++p1) 436 p2 = isspace((unsigned char)*p1) ? p1 : NULL; 437 if (p2) 438 pr->nospace = p2; 439 } 440 } 441 #ifdef DEBUG 442 for (fu = fs->nextfu; fu; fu = fu->nextfu) { 443 (void)printf("fmt:"); 444 for (pr = fu->nextpr; pr; pr = pr->nextpr) 445 (void)printf(" {%s}", pr->fmt); 446 (void)printf("\n"); 447 } 448 #endif 449 } 450 451 void 452 escape(char *p1) 453 { 454 char *p2; 455 456 /* alphabetic escape sequences have to be done in place */ 457 for (p2 = p1;; ++p1, ++p2) { 458 if (!*p1) { 459 *p2 = *p1; 460 break; 461 } 462 if (*p1 == '\\') 463 switch(*++p1) { 464 case 'a': 465 /* *p2 = '\a'; */ 466 *p2 = '\007'; 467 break; 468 case 'b': 469 *p2 = '\b'; 470 break; 471 case 'f': 472 *p2 = '\f'; 473 break; 474 case 'n': 475 *p2 = '\n'; 476 break; 477 case 'r': 478 *p2 = '\r'; 479 break; 480 case 't': 481 *p2 = '\t'; 482 break; 483 case 'v': 484 *p2 = '\v'; 485 break; 486 default: 487 *p2 = *p1; 488 break; 489 } 490 } 491 } 492 493 void 494 badcnt(char *s) 495 { 496 errx(1, "%s: bad byte count", s); 497 } 498 499 void 500 badsfmt(void) 501 { 502 errx(1, "%%s: requires a precision or a byte count"); 503 } 504 505 void 506 badfmt(const char *fmt) 507 { 508 errx(1, "\"%s\": bad format", fmt); 509 } 510 511 void 512 badconv(char *ch) 513 { 514 errx(1, "%%%s: bad conversion character", ch); 515 } 516