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. 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  * @(#)odsyntax.c       8.2 (Berkeley) 5/4/95
  34  * $FreeBSD: src/usr.bin/hexdump/odsyntax.c,v 1.8.2.1 2002/07/23 14:27:06 tjr Exp $
  35  * $DragonFly: src/usr.bin/hexdump/odsyntax.c,v 1.3 2003/10/04 20:36:45 hmp Exp $
  36  */
  37
  38 #include <sys/types.h>
  39
  40 #include <ctype.h>
  41 #include <err.h>
  42 #include <errno.h>
  43 #include <float.h>
  44 #include <stdio.h>
  45 #include <stdlib.h>
  46 #include <string.h>
  47 #include <unistd.h>
  48
  49 #include "hexdump.h"
  50
  51 #define PADDING "         "
  52
  53 int odmode;
  54
  55 static void odadd(const char *);
  56 static void odformat(const char *);
  57 static const char *odformatfp(char, const char *);
  58 static const char *odformatint(char, const char *);
  59 static void odoffset(int, char ***);
  60 static void odusage(void);
  61
  62 void
  63 oldsyntax(int argc, char ***argvp)
  64 {
  65         static char empty[] = "", padding[] = PADDING;
  66         int ch;
  67         char **argv, *end;
  68
  69         /* Add initial (default) address format. -A may change it later. */
  70 #define TYPE_OFFSET     7
  71         add("\"%07.7_Ao\n\"");
  72         add("\"%07.7_ao  \"");
  73
  74         odmode = 1;
  75         argv = *argvp;
  76         while ((ch = getopt(argc, argv, "A:aBbcDdeFfHhIij:LlN:Oost:vXx")) != -1)
  77                 switch (ch) {
  78                 case 'A':
  79                         switch (*optarg) {
  80                         case 'd': case 'o': case 'x':
  81                                 fshead->nextfu->fmt[TYPE_OFFSET] = *optarg;
  82                                 fshead->nextfs->nextfu->fmt[TYPE_OFFSET] =
  83                                     *optarg;
  84                                 break;
  85                         case 'n':
  86                                 fshead->nextfu->fmt = empty;
  87                                 fshead->nextfs->nextfu->fmt = padding;
  88                                 break;
  89                         default:
  90                                 errx(1, "%s: invalid address base", optarg);
  91                         }
  92                         break;
  93                 case 'a':
  94                         odformat("a");
  95                         break;
  96                 case 'B':
  97                 case 'o':
  98                         odformat("o2");
  99                         break;
 100                 case 'b':
 101                         odformat("o1");
 102                         break;
 103                 case 'c':
 104                         odformat("c");
 105                         break;
 106                 case 'd':
 107                         odformat("u2");
 108                         break;
 109                 case 'D':
 110                         odformat("u4");
 111                         break;
 112                 case 'e':               /* undocumented in od */
 113                 case 'F':
 114                         odformat("fD");
 115                         break;
 116                 case 'f':
 117                         odformat("fF");
 118                         break;
 119                 case 'H':
 120                 case 'X':
 121                         odformat("x4");
 122                         break;
 123                 case 'h':
 124                 case 'x':
 125                         odformat("x2");
 126                         break;
 127                 case 'I':
 128                 case 'L':
 129                 case 'l':
 130                         odformat("dL");
 131                         break;
 132                 case 'i':
 133                         odformat("dI");
 134                         break;
 135                 case 'j':
 136                         errno = 0;
 137                         skip = strtoll(optarg, &end, 0);
 138                         if (*end == 'b')
 139                                 skip *= 512;
 140                         else if (*end == 'k')
 141                                 skip *= 1024;
 142                         else if (*end == 'm')
 143                                 skip *= 1048576L;
 144                         if (errno != 0 || skip < 0 || strlen(end) > 1)
 145                                 errx(1, "%s: invalid skip amount", optarg);
 146                         break;
 147                 case 'N':
 148                         if ((length = atoi(optarg)) <= 0)
 149                                 errx(1, "%s: invalid length", optarg);
 150                         break;
 151                 case 'O':
 152                         odformat("o4");
 153                         break;
 154                 case 's':
 155                         odformat("d2");
 156                         break;
 157                 case 't':
 158                         odformat(optarg);
 159                         break;
 160                 case 'v':
 161                         vflag = ALL;
 162                         break;
 163                 case '?':
 164                 default:
 165                         odusage();
 166                 }
 167
 168         if (fshead->nextfs->nextfs == NULL)
 169                 odformat("oS");
 170
 171         argc -= optind;
 172         *argvp += optind;
 173
 174         if (argc)
 175                 odoffset(argc, argvp);
 176 }
 177
 178 static void
 179 odusage(void)
 180 {
 181
 182         fprintf(stderr,
 183 "usage: od [-aBbcDdeFfHhIiLlOosvXx] [-A base] [-j skip] [-N length] [-t type]\n");
 184         fprintf(stderr,
 185 "          [[+]offset[.][Bb]] [file ...]\n");
 186         exit(1);
 187 }
 188
 189 static void
 190 odoffset(int argc, char ***argvp)
 191 {
 192         unsigned char *p, *num, *end;
 193         int base;
 194
 195         /*
 196          * The offset syntax of od(1) was genuinely bizarre.  First, if
 197          * it started with a plus it had to be an offset.  Otherwise, if
 198          * there were at least two arguments, a number or lower-case 'x'
 199          * followed by a number makes it an offset.  By default it was
 200          * octal; if it started with 'x' or '0x' it was hex.  If it ended
 201          * in a '.', it was decimal.  If a 'b' or 'B' was appended, it
 202          * multiplied the number by 512 or 1024 byte units.  There was
 203          * no way to assign a block count to a hex offset.
 204          *
 205          * We assume it's a file if the offset is bad.
 206          */
 207         p = argc == 1 ? (*argvp)[0] : (*argvp)[1];
 208
 209         if (*p != '+' && (argc < 2 ||
 210             (!isdigit(p[0]) && (p[0] != 'x' || !isxdigit(p[1])))))
 211                 return;
 212
 213         base = 0;
 214         /*
 215          * skip over leading '+', 'x[0-9a-fA-f]' or '0x', and
 216          * set base.
 217          */
 218         if (p[0] == '+')
 219                 ++p;
 220         if (p[0] == 'x' && isxdigit(p[1])) {
 221                 ++p;
 222                 base = 16;
 223         } else if (p[0] == '0' && p[1] == 'x') {
 224                 p += 2;
 225                 base = 16;
 226         }
 227
 228         /* skip over the number */
 229         if (base == 16)
 230                 for (num = p; isxdigit(*p); ++p);
 231         else
 232                 for (num = p; isdigit(*p); ++p);
 233
 234         /* check for no number */
 235         if (num == p)
 236                 return;
 237
 238         /* if terminates with a '.', base is decimal */
 239         if (*p == '.') {
 240                 if (base)
 241                         return;
 242                 base = 10;
 243         }
 244
 245         skip = strtoll(num, (char **)&end, base ? base : 8);
 246
 247         /* if end isn't the same as p, we got a non-octal digit */
 248         if (end != p) {
 249                 skip = 0;
 250                 return;
 251         }
 252
 253         if (*p) {
 254                 if (*p == 'B') {
 255                         skip *= 1024;
 256                         ++p;
 257                 } else if (*p == 'b') {
 258                         skip *= 512;
 259                         ++p;
 260                 }
 261         }
 262
 263         if (*p) {
 264                 skip = 0;
 265                 return;
 266         }
 267
 268         /*
 269          * If the offset uses a non-octal base, the base of the offset
 270          * is changed as well.  This isn't pretty, but it's easy.
 271          */
 272         if (base == 16) {
 273                 fshead->nextfu->fmt[TYPE_OFFSET] = 'x';
 274                 fshead->nextfs->nextfu->fmt[TYPE_OFFSET] = 'x';
 275         } else if (base == 10) {
 276                 fshead->nextfu->fmt[TYPE_OFFSET] = 'd';
 277                 fshead->nextfs->nextfu->fmt[TYPE_OFFSET] = 'd';
 278         }
 279
 280         /* Terminate file list. */
 281         (*argvp)[1] = NULL;
 282 }
 283
 284 static void
 285 odformat(const char *fmt)
 286 {
 287         char fchar;
 288
 289         while (*fmt != '\0') {
 290                 switch ((fchar = *fmt++)) {
 291                 case 'a':
 292                         odadd("16/1 \"%3_u \" \"\\n\"");
 293                         break;
 294                 case 'c':
 295                         odadd("16/1 \"%3_c \" \"\\n\"");
 296                         break;
 297                 case 'o': case 'u': case 'd': case 'x':
 298                         fmt = odformatint(fchar, fmt);
 299                         break;
 300                 case 'f':
 301                         fmt = odformatfp(fchar, fmt);
 302                         break;
 303                 default:
 304                         errx(1, "%c: unrecognised format character", fchar);
 305                 }
 306         }
 307 }
 308
 309 static const char *
 310 odformatfp(char fchar __unused, const char *fmt)
 311 {
 312         size_t isize;
 313         int digits;
 314         char *end, *hdfmt;
 315
 316         isize = sizeof(double);
 317         switch (*fmt) {
 318         case 'F':
 319                 isize = sizeof(float);
 320                 fmt++;
 321                 break;
 322         case 'D':
 323                 isize = sizeof(double);
 324                 fmt++;
 325                 break;
 326         case 'L':
 327                 isize = sizeof(long double);
 328                 fmt++;
 329                 break;
 330         default:
 331                 if (isdigit((unsigned char)*fmt)) {
 332                         errno = 0;
 333                         isize = (size_t)strtoul(fmt, &end, 10);
 334                         if (errno != 0 || isize == 0)
 335                                 errx(1, "%s: invalid size", fmt);
 336                         fmt = (const char *)end;
 337                 }
 338         }
 339         switch (isize) {
 340         case sizeof(float):
 341                 digits = FLT_DIG;
 342                 break;
 343         case sizeof(double):
 344                 digits = DBL_DIG;
 345                 break;
 346         default:
 347                 if (isize == sizeof(long double))
 348                         digits = LDBL_DIG;
 349                 else
 350                         errx(1, "unsupported floating point size %lu",
 351                             (u_long)isize);
 352         }
 353
 354         asprintf(&hdfmt, "%lu/%lu \" %%%d.%de \" \"\\n\"",
 355             16UL / (u_long)isize, (u_long)isize, digits + 8, digits);
 356         if (hdfmt == NULL)
 357                 err(1, NULL);
 358         odadd(hdfmt);
 359         free(hdfmt);
 360
 361         return (fmt);
 362 }
 363
 364 static const char *
 365 odformatint(char fchar, const char *fmt)
 366 {
 367         unsigned long long n;
 368         size_t isize;
 369         int digits;
 370         char *end, *hdfmt;
 371
 372         isize = sizeof(int);
 373         switch (*fmt) {
 374         case 'C':
 375                 isize = sizeof(char);
 376                 fmt++;
 377                 break;
 378         case 'I':
 379                 isize = sizeof(int);
 380                 fmt++;
 381                 break;
 382         case 'L':
 383                 isize = sizeof(long);
 384                 fmt++;
 385                 break;
 386         case 'S':
 387                 isize = sizeof(short);
 388                 fmt++;
 389                 break;
 390         default:
 391                 if (isdigit((unsigned char)*fmt)) {
 392                         errno = 0;
 393                         isize = (size_t)strtoul(fmt, &end, 10);
 394                         if (errno != 0 || isize == 0)
 395                                 errx(1, "%s: invalid size", fmt);
 396                         if (isize != sizeof(char) && isize != sizeof(short) &&
 397                             isize != sizeof(int) && isize != sizeof(long))
 398                                 errx(1, "unsupported int size %lu",
 399                                     (u_long)isize);
 400                         fmt = (const char *)end;
 401                 }
 402         }
 403
 404         /*
 405          * Calculate the maximum number of digits we need to
 406          * fit the number. Overestimate for decimal with log
 407          * base 8. We need one extra space for signed numbers
 408          * to store the sign.
 409          */
 410         n = (1ULL << (8 * isize)) - 1;
 411         digits = 0;
 412         while (n != 0) {
 413                 digits++;
 414                 n >>= (fchar == 'x') ? 4 : 3;
 415         }
 416         if (fchar == 'd')
 417                 digits++;
 418         asprintf(&hdfmt, "%lu/%lu \"%*s%%%s%d%c\" \"\\n\"",
 419             16UL / (u_long)isize, (u_long)isize, (int)(4 * isize - digits),
 420             "", (fchar == 'd' || fchar == 'u') ? "" : "0", digits, fchar);
 421         if (hdfmt == NULL)
 422                 err(1, NULL);
 423         odadd(hdfmt);
 424         free(hdfmt);
 425
 426         return (fmt);
 427 }
 428
 429 static void
 430 odadd(const char *fmt)
 431 {
 432         static int needpad;
 433
 434         if (needpad)
 435                 add("\""PADDING"\"");
 436         add(fmt);
 437         needpad = 1;
 438 }