util-linux/hexdump.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * hexdump implementation for busybox
   4  * Based on code from util-linux v 2.11l
   5  *
   6  * Copyright (c) 1989
   7  * The Regents of the University of California.  All rights reserved.
   8  *
   9  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
  10  */
  11
  12 //usage:#define hexdump_trivial_usage
  13 //usage:       "[-bcCdefnosvx" IF_FEATURE_HEXDUMP_REVERSE("R") "] [FILE]..."
  14 //usage:#define hexdump_full_usage "\n\n"
  15 //usage:       "Display FILEs (or stdin) in a user specified format\n"
  16 //usage:     "\n        -b              One-byte octal display"
  17 //usage:     "\n        -c              One-byte character display"
  18 //usage:     "\n        -C              Canonical hex+ASCII, 16 bytes per line"
  19 //usage:     "\n        -d              Two-byte decimal display"
  20 //usage:     "\n        -e FORMAT_STRING"
  21 //usage:     "\n        -f FORMAT_FILE"
  22 //usage:     "\n        -n LENGTH       Interpret only LENGTH bytes of input"
  23 //usage:     "\n        -o              Two-byte octal display"
  24 //usage:     "\n        -s OFFSET       Skip OFFSET bytes"
  25 //usage:     "\n        -v              Display all input data"
  26 //usage:     "\n        -x              Two-byte hexadecimal display"
  27 //usage:        IF_FEATURE_HEXDUMP_REVERSE(
  28 //usage:     "\n        -R              Reverse of 'hexdump -Cv'")
  29 //usage:
  30 //usage:#define hd_trivial_usage
  31 //usage:       "FILE..."
  32 //usage:#define hd_full_usage "\n\n"
  33 //usage:       "hd is an alias for hexdump -C"
  34
  35 #include "libbb.h"
  36 #include "dump.h"
  37
  38 /* This is a NOEXEC applet. Be very careful! */
  39
  40 static void bb_dump_addfile(dumper_t *dumper, char *name)
  41 {
  42         char *p;
  43         FILE *fp;
  44         char *buf;
  45
  46         fp = xfopen_for_read(name);
  47         while ((buf = xmalloc_fgetline(fp)) != NULL) {
  48                 p = skip_whitespace(buf);
  49                 if (*p && (*p != '#')) {
  50                         bb_dump_add(dumper, p);
  51                 }
  52                 free(buf);
  53         }
  54         fclose(fp);
  55 }
  56
  57 static const char *const add_strings[] = {
  58         "\"%07.7_ax \" 16/1 \"%03o \" \"\\n\"",   /* b */
  59         "\"%07.7_ax \" 16/1 \"%3_c \" \"\\n\"",   /* c */
  60         "\"%07.7_ax \" 8/2 \"  %05u \" \"\\n\"",  /* d */
  61         "\"%07.7_ax \" 8/2 \" %06o \" \"\\n\"",   /* o */
  62         "\"%07.7_ax \" 8/2 \"   %04x \" \"\\n\"", /* x */
  63 };
  64
  65 static const char add_first[] ALIGN1 = "\"%07.7_Ax\n\"";
  66
  67 static const char hexdump_opts[] ALIGN1 = "bcdoxCe:f:n:s:v" IF_FEATURE_HEXDUMP_REVERSE("R");
  68
  69 int hexdump_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  70 int hexdump_main(int argc, char **argv)
  71 {
  72         dumper_t *dumper = alloc_dumper();
  73         const char *p;
  74         int ch;
  75 #if ENABLE_FEATURE_HEXDUMP_REVERSE
  76         FILE *fp;
  77         smallint rdump = 0;
  78 #endif
  79
  80         if (ENABLE_HD && !applet_name[2]) { /* we are "hd" */
  81                 ch = 'C';
  82                 goto hd_applet;
  83         }
  84
  85         /* We cannot use getopt32: in hexdump options are cumulative.
  86          * E.g. "hexdump -C -C file" should dump each line twice */
  87         while ((ch = getopt(argc, argv, hexdump_opts)) > 0) {
  88                 p = strchr(hexdump_opts, ch);
  89                 if (!p)
  90                         bb_show_usage();
  91                 if ((p - hexdump_opts) < 5) {
  92                         bb_dump_add(dumper, add_first);
  93                         bb_dump_add(dumper, add_strings[(int)(p - hexdump_opts)]);
  94                 }
  95                 /* Save a little bit of space below by omitting the 'else's. */
  96                 if (ch == 'C') {
  97  hd_applet:
  98                         bb_dump_add(dumper, "\"%08.8_Ax\n\"");
  99                         bb_dump_add(dumper, "\"%08.8_ax  \" 8/1 \"%02x \" \"  \" 8/1 \"%02x \" ");
 100                         bb_dump_add(dumper, "\"  |\" 16/1 \"%_p\" \"|\\n\"");
 101                 }
 102                 if (ch == 'e') {
 103                         bb_dump_add(dumper, optarg);
 104                 } /* else */
 105                 if (ch == 'f') {
 106                         bb_dump_addfile(dumper, optarg);
 107                 } /* else */
 108                 if (ch == 'n') {
 109                         dumper->dump_length = xatoi_positive(optarg);
 110                 } /* else */
 111                 if (ch == 's') { /* compat: -s accepts hex numbers too */
 112                         dumper->dump_skip = xstrtoull_range_sfx(
 113                                 optarg,
 114                                 /*base:*/ 0,
 115                                 /*lo:*/ 0, /*hi:*/ OFF_T_MAX,
 116                                 bkm_suffixes
 117                         );
 118                 } /* else */
 119                 if (ch == 'v') {
 120                         dumper->dump_vflag = ALL;
 121                 }
 122 #if ENABLE_FEATURE_HEXDUMP_REVERSE
 123                 if (ch == 'R') {
 124                         rdump = 1;
 125                 }
 126 #endif
 127         }
 128
 129         if (!dumper->fshead) {
 130                 bb_dump_add(dumper, add_first);
 131                 bb_dump_add(dumper, "\"%07.7_ax \" 8/2 \"%04x \" \"\\n\"");
 132         }
 133
 134         argv += optind;
 135
 136 #if !ENABLE_FEATURE_HEXDUMP_REVERSE
 137         return bb_dump_dump(dumper, argv);
 138 #else
 139         if (!rdump) {
 140                 return bb_dump_dump(dumper, argv);
 141         }
 142
 143         /* -R: reverse of 'hexdump -Cv' */
 144         fp = stdin;
 145         if (!*argv) {
 146                 argv--;
 147                 goto jump_in;
 148         }
 149
 150         do {
 151                 char *buf;
 152                 fp = xfopen_for_read(*argv);
 153  jump_in:
 154                 while ((buf = xmalloc_fgetline(fp)) != NULL) {
 155                         p = buf;
 156                         while (1) {
 157                                 /* skip address or previous byte */
 158                                 while (isxdigit(*p)) p++;
 159                                 while (*p == ' ') p++;
 160                                 /* '|' char will break the line */
 161                                 if (!isxdigit(*p) || sscanf(p, "%x ", &ch) != 1)
 162                                         break;
 163                                 putchar(ch);
 164                         }
 165                         free(buf);
 166                 }
 167                 fclose(fp);
 168         } while (*++argv);
 169
 170         fflush_stdout_and_exit(EXIT_SUCCESS);
 171 #endif
 172 }