usr.bin/hexdump/odsyntax.c

   1 /*-
   2  * Copyright (c) 1990, 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. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#)odsyntax.c       8.2 (Berkeley) 5/4/95
  30  * $FreeBSD: src/usr.bin/hexdump/odsyntax.c,v 1.8.2.1 2002/07/23 14:27:06 tjr Exp $
  31  */
  32
  33 #include <sys/types.h>
  34
  35 #include <ctype.h>
  36 #include <err.h>
  37 #include <errno.h>
  38 #include <float.h>
  39 #include <limits.h>
  40 #include <stdio.h>
  41 #include <stdlib.h>
  42 #include <string.h>
  43 #include <unistd.h>
  44
  45 #include "hexdump.h"
  46
  47 #define PADDING "         "
  48
  49 int odmode;
  50
  51 static void odadd(const char *);
  52 static void odformat(const char *);
  53 static const char *odformatfp(char, const char *);
  54 static const char *odformatint(char, const char *);
  55 static void odoffset(int, char ***);
  56 static void odusage(void);
  57
  58 void
  59 oldsyntax(int argc, char ***argvp)
  60 {
  61         static char empty[] = "", padding[] = PADDING;
  62         int ch;
  63         char **argv, *end;
  64
  65         /* Add initial (default) address format. -A may change it later. */
  66 #define TYPE_OFFSET     7
  67         add("\"%07.7_Ao\n\"");
  68         add("\"%07.7_ao  \"");
  69
  70         odmode = 1;
  71         argv = *argvp;
  72         while ((ch = getopt(argc, argv, "A:aBbcDdeFfHhIij:LlN:Oost:vXx")) != -1) {
  73                 switch (ch) {
  74                 case 'A':
  75                         switch (*optarg) {
  76                         case 'd': case 'o': case 'x':
  77                                 fshead->nextfu->fmt[TYPE_OFFSET] = *optarg;
  78                                 fshead->nextfs->nextfu->fmt[TYPE_OFFSET] =
  79                                     *optarg;
  80                                 break;
  81                         case 'n':
  82                                 fshead->nextfu->fmt = empty;
  83                                 fshead->nextfs->nextfu->fmt = padding;
  84                                 break;
  85                         default:
  86                                 errx(1, "%s: invalid address base", optarg);
  87                         }
  88                         break;
  89                 case 'a':
  90                         odformat("a");
  91                         break;
  92                 case 'B':
  93                 case 'o':
  94                         odformat("o2");
  95                         break;
  96                 case 'b':
  97                         odformat("o1");
  98                         break;
  99                 case 'c':
 100                         odformat("c");
 101                         break;
 102                 case 'd':
 103                         odformat("u2");
 104                         break;
 105                 case 'D':
 106                         odformat("u4");
 107                         break;
 108                 case 'e':               /* undocumented in od */
 109                 case 'F':
 110                         odformat("fD");
 111                         break;
 112                 case 'f':
 113                         odformat("fF");
 114                         break;
 115                 case 'H':
 116                 case 'X':
 117                         odformat("x4");
 118                         break;
 119                 case 'h':
 120                 case 'x':
 121                         odformat("x2");
 122                         break;
 123                 case 'I':
 124                 case 'L':
 125                 case 'l':
 126                         odformat("dL");
 127                         break;
 128                 case 'i':
 129                         odformat("dI");
 130                         break;
 131                 case 'j':
 132                         errno = 0;
 133                         skip = strtoll(optarg, &end, 0);
 134                         if (*end == 'b')
 135                                 skip *= 512;
 136                         else if (*end == 'k')
 137                                 skip *= 1024;
 138                         else if (*end == 'm')
 139                                 skip *= 1048576L;
 140                         if (errno != 0 || skip < 0 || strlen(end) > 1)
 141                                 errx(1, "%s: invalid skip amount", optarg);
 142                         break;
 143                 case 'N':
 144                         if ((length = atoi(optarg)) <= 0)
 145                                 errx(1, "%s: invalid length", optarg);
 146                         break;
 147                 case 'O':
 148                         odformat("o4");
 149                         break;
 150                 case 's':
 151                         odformat("d2");
 152                         break;
 153                 case 't':
 154                         odformat(optarg);
 155                         break;
 156                 case 'v':
 157                         vflag = ALL;
 158                         break;
 159                 case '?':
 160                 default:
 161                         odusage();
 162                 }
 163         }
 164
 165         if (fshead->nextfs->nextfs == NULL)
 166                 odformat("oS");
 167
 168         argc -= optind;
 169         *argvp += optind;
 170
 171         if (argc)
 172                 odoffset(argc, argvp);
 173 }
 174
 175 static void
 176 odusage(void)
 177 {
 178
 179         fprintf(stderr,
 180 "usage: od [-aBbcDdeFfHhIiLlOosvXx] [-A base] [-j skip] [-N length] [-t type]\n");
 181         fprintf(stderr,
 182 "          [[+]offset[.][Bb]] [file ...]\n");
 183         exit(1);
 184 }
 185
 186 static void
 187 odoffset(int argc, char ***argvp)
 188 {
 189         unsigned char *p, *num, *end;
 190         int base;
 191
 192         /*
 193          * The offset syntax of od(1) was genuinely bizarre.  First, if
 194          * it started with a plus it had to be an offset.  Otherwise, if
 195          * there were at least two arguments, a number or lower-case 'x'
 196          * followed by a number makes it an offset.  By default it was
 197          * octal; if it started with 'x' or '0x' it was hex.  If it ended
 198          * in a '.', it was decimal.  If a 'b' or 'B' was appended, it
 199          * multiplied the number by 512 or 1024 byte units.  There was
 200          * no way to assign a block count to a hex offset.
 201          *
 202          * We assume it's a file if the offset is bad.
 203          */
 204         p = argc == 1 ? (*argvp)[0] : (*argvp)[1];
 205
 206         if (*p != '+' && (argc < 2 ||
 207             (!isdigit(p[0]) && (p[0] != 'x' || !isxdigit(p[1])))))
 208                 return;
 209
 210         base = 0;
 211         /*
 212          * skip over leading '+', 'x[0-9a-fA-f]' or '0x', and
 213          * set base.
 214          */
 215         if (p[0] == '+')
 216                 ++p;
 217         if (p[0] == 'x' && isxdigit(p[1])) {
 218                 ++p;
 219                 base = 16;
 220         } else if (p[0] == '0' && p[1] == 'x') {
 221                 p += 2;
 222                 base = 16;
 223         }
 224
 225         /* skip over the number */
 226         if (base == 16)
 227                 for (num = p; isxdigit(*p); ++p);
 228         else
 229                 for (num = p; isdigit(*p); ++p);
 230
 231         /* check for no number */
 232         if (num == p)
 233                 return;
 234
 235         /* if terminates with a '.', base is decimal */
 236         if (*p == '.') {
 237                 if (base)
 238                         return;
 239                 base = 10;
 240         }
 241
 242         skip = strtoll(num, (char **)&end, base ? base : 8);
 243
 244         /* if end isn't the same as p, we got a non-octal digit */
 245         if (end != p) {
 246                 skip = 0;
 247                 return;
 248         }
 249
 250         if (*p) {
 251                 if (*p == 'B') {
 252                         skip *= 1024;
 253                         ++p;
 254                 } else if (*p == 'b') {
 255                         skip *= 512;
 256                         ++p;
 257                 }
 258         }
 259
 260         if (*p) {
 261                 skip = 0;
 262                 return;
 263         }
 264
 265         /*
 266          * If the offset uses a non-octal base, the base of the offset
 267          * is changed as well.  This isn't pretty, but it's easy.
 268          */
 269         if (base == 16) {
 270                 fshead->nextfu->fmt[TYPE_OFFSET] = 'x';
 271                 fshead->nextfs->nextfu->fmt[TYPE_OFFSET] = 'x';
 272         } else if (base == 10) {
 273                 fshead->nextfu->fmt[TYPE_OFFSET] = 'd';
 274                 fshead->nextfs->nextfu->fmt[TYPE_OFFSET] = 'd';
 275         }
 276
 277         /* Terminate file list. */
 278         (*argvp)[1] = NULL;
 279 }
 280
 281 static void
 282 odformat(const char *fmt)
 283 {
 284         char fchar;
 285
 286         while (*fmt != '\0') {
 287                 switch ((fchar = *fmt++)) {
 288                 case 'a':
 289                         odadd("16/1 \"%3_u \" \"\\n\"");
 290                         break;
 291                 case 'c':
 292                         odadd("16/1 \"%3_c \" \"\\n\"");
 293                         break;
 294                 case 'o': case 'u': case 'd': case 'x':
 295                         fmt = odformatint(fchar, fmt);
 296                         break;
 297                 case 'f':
 298                         fmt = odformatfp(fchar, fmt);
 299                         break;
 300                 default:
 301                         errx(1, "%c: unrecognised format character", fchar);
 302                 }
 303         }
 304 }
 305
 306 static const char *
 307 odformatfp(char fchar __unused, const char *fmt)
 308 {
 309         size_t isize;
 310         int digits, width;
 311         char *end, *hdfmt;
 312
 313         isize = sizeof(double);
 314         switch (*fmt) {
 315         case 'F':
 316                 isize = sizeof(float);
 317                 fmt++;
 318                 break;
 319         case 'D':
 320                 isize = sizeof(double);
 321                 fmt++;
 322                 break;
 323         case 'L':
 324                 isize = sizeof(long double);
 325                 fmt++;
 326                 break;
 327         default:
 328                 if (isdigit((unsigned char)*fmt)) {
 329                         errno = 0;
 330                         isize = (size_t)strtoul(fmt, &end, 10);
 331                         if (errno != 0 || isize == 0)
 332                                 errx(1, "%s: invalid size", fmt);
 333                         fmt = (const char *)end;
 334                 }
 335         }
 336         switch (isize) {
 337         case sizeof(float):
 338                 digits = FLT_DIG;
 339                 width = digits + 7; /* -x.*e[+-]xx */
 340                 break;
 341         case sizeof(double):
 342                 digits = DBL_DIG;
 343                 width = digits + 8; /* -x.*e[+-]xxx */
 344                 break;
 345         default:
 346                 if (isize == sizeof(long double)) {
 347                         digits = LDBL_DIG;
 348                         width = digits + 9; /* -x.*e[+-]xxxx */
 349                 } else {
 350                         errx(1, "unsupported floating point size %lu",
 351                             (u_long)isize);
 352                 }
 353         }
 354
 355         asprintf(&hdfmt, "%lu/%lu \" %%%d.%de \" \"\\n\"",
 356             16UL / (u_long)isize, (u_long)isize, width, digits);
 357         if (hdfmt == NULL)
 358                 err(1, NULL);
 359         odadd(hdfmt);
 360         free(hdfmt);
 361
 362         return (fmt);
 363 }
 364
 365 static const char *
 366 odformatint(char fchar, const char *fmt)
 367 {
 368         unsigned long long n;
 369         size_t isize;
 370         int digits;
 371         char *end, *hdfmt;
 372
 373         isize = sizeof(int);
 374         switch (*fmt) {
 375         case 'C':
 376                 isize = sizeof(char);
 377                 fmt++;
 378                 break;
 379         case 'I':
 380                 isize = sizeof(int);
 381                 fmt++;
 382                 break;
 383         case 'L':
 384                 isize = sizeof(long);
 385                 fmt++;
 386                 break;
 387         case 'S':
 388                 isize = sizeof(short);
 389                 fmt++;
 390                 break;
 391         default:
 392                 if (isdigit((unsigned char)*fmt)) {
 393                         errno = 0;
 394                         isize = (size_t)strtoul(fmt, &end, 10);
 395                         if (errno != 0 || isize == 0)
 396                                 errx(1, "%s: invalid size", fmt);
 397                         if (isize != sizeof(char) && isize != sizeof(short) &&
 398                             isize != sizeof(int) && isize != sizeof(long))
 399                                 errx(1, "unsupported int size %lu",
 400                                     (u_long)isize);
 401                         fmt = (const char *)end;
 402                 }
 403         }
 404
 405         /*
 406          * Calculate the maximum number of digits we need to
 407          * fit the number. Overestimate for decimal with log
 408          * base 8. We need one extra space for signed numbers
 409          * to store the sign.
 410          */
 411         n = (isize >= sizeof(n)) ? ULLONG_MAX : (1ULL << (8 * isize)) - 1;
 412         digits = 0;
 413         while (n != 0) {
 414                 digits++;
 415                 n >>= (fchar == 'x') ? 4 : 3;
 416         }
 417         if (fchar == 'd')
 418                 digits++;
 419         asprintf(&hdfmt, "%lu/%lu \"%*s%%%s%d%c\" \"\\n\"",
 420             16UL / (u_long)isize, (u_long)isize, (int)(4 * isize - digits),
 421             "", (fchar == 'd' || fchar == 'u') ? "" : "0", digits, fchar);
 422         if (hdfmt == NULL)
 423                 err(1, NULL);
 424         odadd(hdfmt);
 425         free(hdfmt);
 426
 427         return (fmt);
 428 }
 429
 430 static void
 431 odadd(const char *fmt)
 432 {
 433         static int needpad;
 434
 435         if (needpad)
 436                 add("\""PADDING"\"");
 437         add(fmt);
 438         needpad = 1;
 439 }