1 /* 2 * Copyright (c) 1989 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms are permitted 6 * provided that the above copyright notice and this paragraph are 7 * duplicated in all such forms and that any documentation, 8 * advertising materials, and other materials related to such 9 * distribution and use acknowledge that the software was developed 10 * by the University of California, Berkeley. The name of the 11 * University may not be used to endorse or promote products derived 12 * from this software without specific prior written permission. 13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 16 */ 17 18 #ifndef lint 19 static char sccsid[] = "@(#)parse.c 5.1 (Berkeley) 08/29/89"; 20 #endif /* not lint */ 21 22 #include <sys/types.h> 23 #include <sys/file.h> 24 #include <stdio.h> 25 #include <ctype.h> 26 #include <strings.h> 27 #include "hexdump.h" 28 29 FU *endfu; /* format at end-of-data */ 30 31 addfile(name) 32 char *name; 33 { 34 register char *p; 35 FILE *fp; 36 int ch; 37 char buf[2048 + 1]; 38 39 if (!(fp = fopen(name, "r"))) { 40 (void)fprintf(stderr, "hexdump: can't read %s.\n", name); 41 exit(1); 42 } 43 while (fgets(buf, sizeof(buf), fp)) { 44 if (!(p = index(buf, '\n'))) { 45 (void)fprintf(stderr, "hexdump: line too long.\n"); 46 while ((ch = getchar()) != '\n' && ch != EOF); 47 continue; 48 } 49 *p = '\0'; 50 for (p = buf; *p && isspace(*p); ++p); 51 if (!*p || *p == '#') 52 continue; 53 add(p); 54 } 55 (void)fclose(fp); 56 } 57 58 add(fmt) 59 char *fmt; 60 { 61 register char *p; 62 static FS **nextfs; 63 FS *tfs; 64 FU *tfu, **nextfu; 65 char savech, *savep, *emalloc(), *strdup(); 66 67 /* start new linked list of format units */ 68 /* NOSTRICT */ 69 tfs = (FS *)emalloc(sizeof(FS)); 70 if (!fshead) 71 fshead = tfs; 72 else 73 *nextfs = tfs; 74 nextfs = &tfs->nextfs; 75 nextfu = &tfs->nextfu; 76 77 /* take the format string and break it up into format units */ 78 for (p = fmt;;) { 79 /* skip leading white space */ 80 for (; isspace(*p); ++p); 81 if (!*p) 82 break; 83 84 /* allocate a new format unit and link it in */ 85 /* NOSTRICT */ 86 tfu = (FU *)emalloc(sizeof(FU)); 87 *nextfu = tfu; 88 nextfu = &tfu->nextfu; 89 tfu->reps = 1; 90 91 /* if leading digit, repetition count */ 92 if (isdigit(*p)) { 93 for (savep = p; isdigit(*p); ++p); 94 if (!isspace(*p) && *p != '/') 95 badfmt(fmt); 96 /* may overwrite either white space or slash */ 97 savech = *p; 98 *p = '\0'; 99 tfu->reps = atoi(savep); 100 tfu->flags = F_SETREP; 101 *p = savech; 102 /* skip trailing white space */ 103 for (++p; isspace(*p); ++p); 104 } 105 106 /* skip slash and trailing white space */ 107 if (*p == '/') 108 while (isspace(*++p)); 109 110 /* byte count */ 111 if (isdigit(*p)) { 112 for (savep = p; isdigit(*p); ++p); 113 if (!isspace(*p)) 114 badfmt(fmt); 115 savech = *p; 116 *p = '\0'; 117 tfu->bcnt = atoi(savep); 118 *p = savech; 119 /* skip trailing white space */ 120 for (++p; isspace(*p); ++p); 121 } 122 123 /* format */ 124 if (*p != '"') 125 badfmt(fmt); 126 for (savep = ++p; *p != '"'; ++p); 127 if (*p != '"') 128 badfmt(fmt); 129 savech = *p; 130 *p = '\0'; 131 if (!(tfu->fmt = strdup(savep))) 132 nomem(); 133 escape(tfu->fmt); 134 *p++ = savech; 135 } 136 } 137 138 static char *spec = ".#-+ 0123456789"; 139 size(fs) 140 FS *fs; 141 { 142 register FU *fu; 143 register int bcnt, cursize; 144 register char *fmt; 145 int prec; 146 147 /* figure out the data block size needed for each format unit */ 148 for (cursize = 0, fu = fs->nextfu; fu; fu = fu->nextfu) { 149 if (fu->bcnt) { 150 cursize += fu->bcnt * fu->reps; 151 continue; 152 } 153 for (bcnt = prec = 0, fmt = fu->fmt; *fmt; ++fmt) { 154 if (*fmt != '%') 155 continue; 156 /* 157 * skip any special chars -- save precision in 158 * case it's a %s format. 159 */ 160 while (index(spec + 1, *++fmt)); 161 if (*fmt == '.' && isdigit(*++fmt)) { 162 prec = atoi(fmt); 163 while (isdigit(*++fmt)); 164 } 165 switch(*fmt) { 166 case 'c': 167 bcnt += 1; 168 break; 169 case 'd': case 'i': case 'o': case 'u': 170 case 'x': case 'X': 171 bcnt += 4; 172 break; 173 case 'e': case 'E': case 'f': case 'g': case 'G': 174 bcnt += 8; 175 break; 176 case 's': 177 bcnt += prec; 178 break; 179 case '_': 180 switch(*++fmt) { 181 case 'c': case 'p': case 'u': 182 bcnt += 1; 183 break; 184 } 185 } 186 } 187 cursize += bcnt * fu->reps; 188 } 189 return(cursize); 190 } 191 192 rewrite(fs) 193 FS *fs; 194 { 195 enum { NOTOKAY, USEBCNT, USEPREC } sokay; 196 register PR *pr, **nextpr; 197 register FU *fu; 198 register char *p1, *p2; 199 char savech, *fmtp; 200 int nconv, prec; 201 202 for (fu = fs->nextfu; fu; fu = fu->nextfu) { 203 /* 204 * break each format unit into print units; each 205 * conversion character gets its own. 206 */ 207 for (nconv = 0, fmtp = fu->fmt; *fmtp; nextpr = &pr->nextpr) { 208 /* NOSTRICT */ 209 pr = (PR *)emalloc(sizeof(PR)); 210 if (!fu->nextpr) 211 fu->nextpr = pr; 212 else 213 *nextpr = pr; 214 215 /* skip preceding text and up to the next % sign */ 216 for (p1 = fmtp; *p1 && *p1 != '%'; ++p1); 217 218 /* only text in the string */ 219 if (!*p1) { 220 pr->fmt = fmtp; 221 pr->flags = F_TEXT; 222 break; 223 } 224 225 /* 226 * get precision for %s -- if have a byte count, don't 227 * need it. 228 */ 229 if (fu->bcnt) { 230 sokay = USEBCNT; 231 /* skip to conversion character */ 232 for (++p1; index(spec, *p1); ++p1); 233 } else { 234 /* skip any special chars, field width */ 235 while (index(spec + 1, *++p1)); 236 if (*p1 == '.' && isdigit(*++p1)) { 237 sokay = USEPREC; 238 prec = atoi(p1); 239 while (isdigit(*++p1)); 240 } 241 else 242 sokay = NOTOKAY; 243 } 244 245 p2 = p1 + 1; /* set end pointer */ 246 247 /* 248 * figure out the byte count for each conversion; 249 * rewrite the format as necessary, set up blank- 250 * padding for end of data. 251 */ 252 switch(*p1) { 253 case 'c': 254 pr->flags = F_CHAR; 255 switch(fu->bcnt) { 256 case 0: case 1: 257 pr->bcnt = 1; 258 break; 259 default: 260 p1[1] = '\0'; 261 badcnt(p1); 262 } 263 break; 264 case 'd': case 'i': 265 pr->flags = F_INT; 266 goto sw1; 267 case 'o': case 'u': case 'x': case 'X': 268 pr->flags = F_UINT; 269 sw1: switch(fu->bcnt) { 270 case 0: case 4: 271 pr->bcnt = 4; 272 break; 273 case 1: 274 pr->bcnt = 1; 275 break; 276 case 2: 277 pr->bcnt = 2; 278 break; 279 default: 280 p1[1] = '\0'; 281 badcnt(p1); 282 } 283 break; 284 case 'e': case 'E': case 'f': case 'g': case 'G': 285 pr->flags = F_DBL; 286 switch(fu->bcnt) { 287 case 0: case 8: 288 pr->bcnt = 8; 289 break; 290 case 4: 291 pr->bcnt = 4; 292 break; 293 default: 294 p1[1] = '\0'; 295 badcnt(p1); 296 } 297 break; 298 case 's': 299 pr->flags = F_STR; 300 switch(sokay) { 301 case NOTOKAY: 302 badsfmt(); 303 case USEBCNT: 304 pr->bcnt = fu->bcnt; 305 break; 306 case USEPREC: 307 pr->bcnt = prec; 308 break; 309 } 310 break; 311 case '_': 312 ++p2; 313 switch(p1[1]) { 314 case 'A': 315 endfu = fu; 316 fu->flags |= F_IGNORE; 317 /* FALLTHROUGH */ 318 case 'a': 319 pr->flags = F_ADDRESS; 320 ++p2; 321 switch(p1[2]) { 322 case 'd': case 'o': case'x': 323 *p1 = p1[2]; 324 break; 325 default: 326 p1[3] = '\0'; 327 badconv(p1); 328 } 329 break; 330 case 'c': 331 pr->flags = F_C; 332 /* *p1 = 'c'; set in conv_c */ 333 goto sw2; 334 case 'p': 335 pr->flags = F_P; 336 *p1 = 'c'; 337 goto sw2; 338 case 'u': 339 pr->flags = F_U; 340 /* *p1 = 'c'; set in conv_u */ 341 sw2: switch(fu->bcnt) { 342 case 0: case 1: 343 pr->bcnt = 1; 344 break; 345 default: 346 p1[2] = '\0'; 347 badcnt(p1); 348 } 349 break; 350 default: 351 p1[2] = '\0'; 352 badconv(p1); 353 } 354 break; 355 default: 356 p1[1] = '\0'; 357 badconv(p1); 358 } 359 360 /* 361 * copy to PR format string, set conversion character 362 * pointer, update original. 363 */ 364 savech = *p2; 365 p1[1] = '\0'; 366 if (!(pr->fmt = strdup(fmtp))) 367 nomem(); 368 *p2 = savech; 369 pr->cchar = pr->fmt + (p1 - fmtp); 370 fmtp = p2; 371 372 /* only one conversion character if byte count */ 373 if (!(pr->flags&F_ADDRESS) && fu->bcnt && nconv++) { 374 (void)fprintf(stderr, 375 "hexdump: byte count with multiple conversion characters.\n"); 376 exit(1); 377 } 378 } 379 /* 380 * if format unit byte count not specified, figure it out 381 * so can adjust rep count later. 382 */ 383 if (!fu->bcnt) 384 for (pr = fu->nextpr; pr; pr = pr->nextpr) 385 fu->bcnt += pr->bcnt; 386 } 387 /* 388 * if the format string interprets any data at all, and it's 389 * not the same as the blocksize, and its last format unit 390 * interprets any data at all, and has no iteration count, 391 * repeat it as necessary. 392 * 393 * if, rep count is greater than 1, no trailing whitespace 394 * gets output from the last iteration of the format unit. 395 */ 396 for (fu = fs->nextfu;; fu = fu->nextfu) { 397 if (!fu->nextfu && fs->bcnt < blocksize && 398 !(fu->flags&F_SETREP) && fu->bcnt) 399 fu->reps += (blocksize - fs->bcnt) / fu->bcnt; 400 if (fu->reps > 1) { 401 for (pr = fu->nextpr;; pr = pr->nextpr) 402 if (!pr->nextpr) 403 break; 404 for (p1 = pr->fmt, p2 = NULL; *p1; ++p1) 405 p2 = isspace(*p1) ? p1 : NULL; 406 if (p2) 407 pr->nospace = p2; 408 } 409 if (!fu->nextfu) 410 break; 411 } 412 } 413 414 415 escape(p1) 416 register char *p1; 417 { 418 register char *p2; 419 420 /* alphabetic escape sequences have to be done in place */ 421 for (p2 = p1;; ++p1, ++p2) { 422 if (!*p1) { 423 *p2 = *p1; 424 break; 425 } 426 if (*p1 == '\\') 427 switch(*++p1) { 428 case 'a': 429 /* *p2 = '\a'; */ 430 *p2 = '\007'; 431 break; 432 case 'b': 433 *p2 = '\b'; 434 break; 435 case 'f': 436 *p2 = '\f'; 437 break; 438 case 'n': 439 *p2 = '\n'; 440 break; 441 case 'r': 442 *p2 = '\r'; 443 break; 444 case 't': 445 *p2 = '\t'; 446 break; 447 case 'v': 448 *p2 = '\v'; 449 break; 450 default: 451 *p2 = *p1; 452 break; 453 } 454 } 455 } 456 457 badcnt(s) 458 char *s; 459 { 460 (void)fprintf(stderr, 461 "hexdump: bad byte count for conversion character %s.\n", s); 462 exit(1); 463 } 464 465 badsfmt() 466 { 467 (void)fprintf(stderr, 468 "hexdump: %%s requires a precision or a byte count.\n"); 469 exit(1); 470 } 471 472 badfmt(fmt) 473 char *fmt; 474 { 475 (void)fprintf(stderr, "hexdump: bad format {%s}\n", fmt); 476 exit(1); 477 } 478 479 badconv(ch) 480 char *ch; 481 { 482 (void)fprintf(stderr, "hexdump: bad conversion character %s.\n", ch); 483 exit(1); 484 } 485