usr.bin/hexdump/parse.c

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