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 tarball for details.
  10  */
  11
  12 #include "libbb.h"
  13 #include "dump.h"
  14
  15 /* This is a NOEXEC applet. Be very careful! */
  16
  17
  18 static void bb_dump_addfile(dumper_t *dumper, char *name)
  19 {
  20         char *p;
  21         FILE *fp;
  22         char *buf;
  23
  24         fp = xfopen(name, "r");
  25
  26         while ((buf = xmalloc_fgetline(fp)) != NULL) {
  27                 p = skip_whitespace(buf);
  28
  29                 if (*p && (*p != '#')) {
  30                         bb_dump_add(dumper, p);
  31                 }
  32                 free(buf);
  33         }
  34         fclose(fp);
  35 }
  36
  37 static const char *const add_strings[] = {
  38         "\"%07.7_ax \" 16/1 \"%03o \" \"\\n\"",         /* b */
  39         "\"%07.7_ax \" 16/1 \"%3_c \" \"\\n\"",         /* c */
  40         "\"%07.7_ax \" 8/2 \"  %05u \" \"\\n\"",        /* d */
  41         "\"%07.7_ax \" 8/2 \" %06o \" \"\\n\"",         /* o */
  42         "\"%07.7_ax \" 8/2 \"   %04x \" \"\\n\"",       /* x */
  43 };
  44
  45 static const char add_first[] ALIGN1 = "\"%07.7_Ax\n\"";
  46
  47 static const char hexdump_opts[] ALIGN1 = "bcdoxCe:f:n:s:v" USE_FEATURE_HEXDUMP_REVERSE("R");
  48
  49 static const struct suffix_mult suffixes[] = {
  50         { "b", 512 },
  51         { "k", 1024 },
  52         { "m", 1024*1024 },
  53         { }
  54 };
  55
  56 int hexdump_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  57 int hexdump_main(int argc, char **argv)
  58 {
  59         dumper_t *dumper = alloc_dumper();
  60         const char *p;
  61         int ch;
  62 #if ENABLE_FEATURE_HEXDUMP_REVERSE
  63         FILE *fp;
  64         smallint rdump = 0;
  65 #endif
  66
  67         if (ENABLE_HD && !applet_name[2]) { /* we are "hd" */
  68                 ch = 'C';
  69                 goto hd_applet;
  70         }
  71
  72         /* We cannot use getopt32: in hexdump options are cumulative.
  73          * E.g. "hexdump -C -C file" should dump each line twice */
  74         while ((ch = getopt(argc, argv, hexdump_opts)) > 0) {
  75                 p = strchr(hexdump_opts, ch);
  76                 if (!p)
  77                         bb_show_usage();
  78                 if ((p - hexdump_opts) < 5) {
  79                         bb_dump_add(dumper, add_first);
  80                         bb_dump_add(dumper, add_strings[(int)(p - hexdump_opts)]);
  81                 }
  82                 /* Save a little bit of space below by omitting the 'else's. */
  83                 if (ch == 'C') {
  84  hd_applet:
  85                         bb_dump_add(dumper, "\"%08.8_Ax\n\"");
  86                         bb_dump_add(dumper, "\"%08.8_ax  \" 8/1 \"%02x \" \"  \" 8/1 \"%02x \" ");
  87                         bb_dump_add(dumper, "\"  |\" 16/1 \"%_p\" \"|\\n\"");
  88                 }
  89                 if (ch == 'e') {
  90                         bb_dump_add(dumper, optarg);
  91                 } /* else */
  92                 if (ch == 'f') {
  93                         bb_dump_addfile(dumper, optarg);
  94                 } /* else */
  95                 if (ch == 'n') {
  96                         dumper->dump_length = xatoi_u(optarg);
  97                 } /* else */
  98                 if (ch == 's') {
  99                         dumper->dump_skip = xatoul_range_sfx(optarg, 0, LONG_MAX, suffixes);
 100                 } /* else */
 101                 if (ch == 'v') {
 102                         dumper->dump_vflag = ALL;
 103                 }
 104 #if ENABLE_FEATURE_HEXDUMP_REVERSE
 105                 if (ch == 'R') {
 106                         rdump = 1;
 107                 }
 108 #endif
 109         }
 110
 111         if (!dumper->fshead) {
 112                 bb_dump_add(dumper, add_first);
 113                 bb_dump_add(dumper, "\"%07.7_ax \" 8/2 \"%04x \" \"\\n\"");
 114         }
 115
 116         argv += optind;
 117
 118 #if !ENABLE_FEATURE_HEXDUMP_REVERSE
 119         return bb_dump_dump(dumper, argv);
 120 #else
 121         if (!rdump) {
 122                 return bb_dump_dump(dumper, argv);
 123         }
 124
 125         /* -R: reverse of 'hexdump -Cv' */
 126         fp = stdin;
 127         if (!*argv) {
 128                 argv--;
 129                 goto jump_in;
 130         }
 131
 132         do {
 133                 char *buf;
 134                 fp = xfopen(*argv, "r");
 135  jump_in:
 136                 while ((buf = xmalloc_fgetline(fp)) != NULL) {
 137                         p = buf;
 138                         while (1) {
 139                                 /* skip address or previous byte */
 140                                 while (isxdigit(*p)) p++;
 141                                 while (*p == ' ') p++;
 142                                 /* '|' char will break the line */
 143                                 if (!isxdigit(*p) || sscanf(p, "%x ", &ch) != 1)
 144                                         break;
 145                                 putchar(ch);
 146                         }
 147                         free(buf);
 148                 }
 149                 fclose(fp);
 150         } while (*++argv);
 151
 152         fflush_stdout_and_exit(EXIT_SUCCESS);
 153 #endif
 154 }