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