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  * $DragonFly: src/usr.bin/hexdump/odsyntax.c,v 1.3 2003/10/04 20:36:45 hmp Exp $
  32  */
  33
  34 #include <sys/types.h>
  35
  36 #include <ctype.h>
  37 #include <err.h>
  38 #include <errno.h>
  39 #include <float.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         if (fshead->nextfs->nextfs == NULL)
 165                 odformat("oS");
 166
 167         argc -= optind;
 168         *argvp += optind;
 169
 170         if (argc)
 171                 odoffset(argc, argvp);
 172 }
 173
 174 static void
 175 odusage(void)
 176 {
 177
 178         fprintf(stderr,
 179 "usage: od [-aBbcDdeFfHhIiLlOosvXx] [-A base] [-j skip] [-N length] [-t type]\n");
 180         fprintf(stderr,
 181 "          [[+]offset[.][Bb]] [file ...]\n");
 182         exit(1);
 183 }
 184
 185 static void
 186 odoffset(int argc, char ***argvp)
 187 {
 188         unsigned char *p, *num, *end;
 189         int base;
 190
 191         /*
 192          * The offset syntax of od(1) was genuinely bizarre.  First, if
 193          * it started with a plus it had to be an offset.  Otherwise, if
 194          * there were at least two arguments, a number or lower-case 'x'
 195          * followed by a number makes it an offset.  By default it was
 196          * octal; if it started with 'x' or '0x' it was hex.  If it ended
 197          * in a '.', it was decimal.  If a 'b' or 'B' was appended, it
 198          * multiplied the number by 512 or 1024 byte units.  There was
 199          * no way to assign a block count to a hex offset.
 200          *
 201          * We assume it's a file if the offset is bad.
 202          */
 203         p = argc == 1 ? (*argvp)[0] : (*argvp)[1];
 204
 205         if (*p != '+' && (argc < 2 ||
 206             (!isdigit(p[0]) && (p[0] != 'x' || !isxdigit(p[1])))))
 207                 return;
 208
 209         base = 0;
 210         /*
 211          * skip over leading '+', 'x[0-9a-fA-f]' or '0x', and
 212          * set base.
 213          */
 214         if (p[0] == '+')
 215                 ++p;
 216         if (p[0] == 'x' && isxdigit(p[1])) {
 217                 ++p;
 218                 base = 16;
 219         } else if (p[0] == '0' && p[1] == 'x') {
 220                 p += 2;
 221                 base = 16;
 222         }
 223
 224         /* skip over the number */
 225         if (base == 16)
 226                 for (num = p; isxdigit(*p); ++p);
 227         else
 228                 for (num = p; isdigit(*p); ++p);
 229
 230         /* check for no number */
 231         if (num == p)
 232                 return;
 233
 234         /* if terminates with a '.', base is decimal */
 235         if (*p == '.') {
 236                 if (base)
 237                         return;
 238                 base = 10;
 239         }
 240
 241         skip = strtoll(num, (char **)&end, base ? base : 8);
 242
 243         /* if end isn't the same as p, we got a non-octal digit */
 244         if (end != p) {
 245                 skip = 0;
 246                 return;
 247         }
 248
 249         if (*p) {
 250                 if (*p == 'B') {
 251                         skip *= 1024;
 252                         ++p;
 253                 } else if (*p == 'b') {
 254                         skip *= 512;
 255                         ++p;
 256                 }
 257         }
 258
 259         if (*p) {
 260                 skip = 0;
 261                 return;
 262         }
 263
 264         /*
 265          * If the offset uses a non-octal base, the base of the offset
 266          * is changed as well.  This isn't pretty, but it's easy.
 267          */
 268         if (base == 16) {
 269                 fshead->nextfu->fmt[TYPE_OFFSET] = 'x';
 270                 fshead->nextfs->nextfu->fmt[TYPE_OFFSET] = 'x';
 271         } else if (base == 10) {
 272                 fshead->nextfu->fmt[TYPE_OFFSET] = 'd';
 273                 fshead->nextfs->nextfu->fmt[TYPE_OFFSET] = 'd';
 274         }
 275
 276         /* Terminate file list. */
 277         (*argvp)[1] = NULL;
 278 }
 279
 280 static void
 281 odformat(const char *fmt)
 282 {
 283         char fchar;
 284
 285         while (*fmt != '\0') {
 286                 switch ((fchar = *fmt++)) {
 287                 case 'a':
 288                         odadd("16/1 \"%3_u \" \"\\n\"");
 289                         break;
 290                 case 'c':
 291                         odadd("16/1 \"%3_c \" \"\\n\"");
 292                         break;
 293                 case 'o': case 'u': case 'd': case 'x':
 294                         fmt = odformatint(fchar, fmt);
 295                         break;
 296                 case 'f':
 297                         fmt = odformatfp(fchar, fmt);
 298                         break;
 299                 default:
 300                         errx(1, "%c: unrecognised format character", fchar);
 301                 }
 302         }
 303 }
 304
 305 static const char *
 306 odformatfp(char fchar __unused, const char *fmt)
 307 {
 308         size_t isize;
 309         int digits;
 310         char *end, *hdfmt;
 311
 312         isize = sizeof(double);
 313         switch (*fmt) {
 314         case 'F':
 315                 isize = sizeof(float);
 316                 fmt++;
 317                 break;
 318         case 'D':
 319                 isize = sizeof(double);
 320                 fmt++;
 321                 break;
 322         case 'L':
 323                 isize = sizeof(long double);
 324                 fmt++;
 325                 break;
 326         default:
 327                 if (isdigit((unsigned char)*fmt)) {
 328                         errno = 0;
 329                         isize = (size_t)strtoul(fmt, &end, 10);
 330                         if (errno != 0 || isize == 0)
 331                                 errx(1, "%s: invalid size", fmt);
 332                         fmt = (const char *)end;
 333                 }
 334         }
 335         switch (isize) {
 336         case sizeof(float):
 337                 digits = FLT_DIG;
 338                 break;
 339         case sizeof(double):
 340                 digits = DBL_DIG;
 341                 break;
 342         default:
 343                 if (isize == sizeof(long double))
 344                         digits = LDBL_DIG;
 345                 else
 346                         errx(1, "unsupported floating point size %lu",
 347                             (u_long)isize);
 348         }
 349
 350         asprintf(&hdfmt, "%lu/%lu \" %%%d.%de \" \"\\n\"",
 351             16UL / (u_long)isize, (u_long)isize, digits + 8, digits);
 352         if (hdfmt == NULL)
 353                 err(1, NULL);
 354         odadd(hdfmt);
 355         free(hdfmt);
 356
 357         return (fmt);
 358 }
 359
 360 static const char *
 361 odformatint(char fchar, const char *fmt)
 362 {
 363         unsigned long long n;
 364         size_t isize;
 365         int digits;
 366         char *end, *hdfmt;
 367
 368         isize = sizeof(int);
 369         switch (*fmt) {
 370         case 'C':
 371                 isize = sizeof(char);
 372                 fmt++;
 373                 break;
 374         case 'I':
 375                 isize = sizeof(int);
 376                 fmt++;
 377                 break;
 378         case 'L':
 379                 isize = sizeof(long);
 380                 fmt++;
 381                 break;
 382         case 'S':
 383                 isize = sizeof(short);
 384                 fmt++;
 385                 break;
 386         default:
 387                 if (isdigit((unsigned char)*fmt)) {
 388                         errno = 0;
 389                         isize = (size_t)strtoul(fmt, &end, 10);
 390                         if (errno != 0 || isize == 0)
 391                                 errx(1, "%s: invalid size", fmt);
 392                         if (isize != sizeof(char) && isize != sizeof(short) &&
 393                             isize != sizeof(int) && isize != sizeof(long))
 394                                 errx(1, "unsupported int size %lu",
 395                                     (u_long)isize);
 396                         fmt = (const char *)end;
 397                 }
 398         }
 399
 400         /*
 401          * Calculate the maximum number of digits we need to
 402          * fit the number. Overestimate for decimal with log
 403          * base 8. We need one extra space for signed numbers
 404          * to store the sign.
 405          */
 406         n = (1ULL << (8 * isize)) - 1;
 407         digits = 0;
 408         while (n != 0) {
 409                 digits++;
 410                 n >>= (fchar == 'x') ? 4 : 3;
 411         }
 412         if (fchar == 'd')
 413                 digits++;
 414         asprintf(&hdfmt, "%lu/%lu \"%*s%%%s%d%c\" \"\\n\"",
 415             16UL / (u_long)isize, (u_long)isize, (int)(4 * isize - digits),
 416             "", (fchar == 'd' || fchar == 'u') ? "" : "0", digits, fchar);
 417         if (hdfmt == NULL)
 418                 err(1, NULL);
 419         odadd(hdfmt);
 420         free(hdfmt);
 421
 422         return (fmt);
 423 }
 424
 425 static void
 426 odadd(const char *fmt)
 427 {
 428         static int needpad;
 429
 430         if (needpad)
 431                 add("\""PADDING"\"");
 432         add(fmt);
 433         needpad = 1;
 434 }