1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * hexdump implementation for busybox
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4 | * Based on code from util-linux v 2.11l
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5 | *
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6 | * Copyright (c) 1989
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7 | * The Regents of the University of California. All rights reserved.
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8 | *
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9 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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10 | */
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11 |
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12 | //usage:#define hexdump_trivial_usage
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13 | //usage: "[-bcCdefnosvx" IF_FEATURE_HEXDUMP_REVERSE("R") "] [FILE]..."
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14 | //usage:#define hexdump_full_usage "\n\n"
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15 | //usage: "Display FILEs (or stdin) in a user specified format\n"
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16 | //usage: "\n -b One-byte octal display"
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17 | //usage: "\n -c One-byte character display"
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18 | //usage: "\n -C Canonical hex+ASCII, 16 bytes per line"
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19 | //usage: "\n -d Two-byte decimal display"
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20 | //usage: "\n -e FORMAT_STRING"
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21 | //usage: "\n -f FORMAT_FILE"
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22 | //usage: "\n -n LENGTH Interpret only LENGTH bytes of input"
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23 | //usage: "\n -o Two-byte octal display"
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24 | //usage: "\n -s OFFSET Skip OFFSET bytes"
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25 | //usage: "\n -v Display all input data"
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26 | //usage: "\n -x Two-byte hexadecimal display"
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27 | //usage: IF_FEATURE_HEXDUMP_REVERSE(
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28 | //usage: "\n -R Reverse of 'hexdump -Cv'")
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29 | //usage:
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30 | //usage:#define hd_trivial_usage
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31 | //usage: "FILE..."
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32 | //usage:#define hd_full_usage "\n\n"
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33 | //usage: "hd is an alias for hexdump -C"
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34 |
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35 | #include "libbb.h"
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36 | #include "dump.h"
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37 |
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38 | /* This is a NOEXEC applet. Be very careful! */
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39 |
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40 | static void bb_dump_addfile(dumper_t *dumper, char *name)
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41 | {
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42 | char *p;
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43 | FILE *fp;
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44 | char *buf;
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45 |
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46 | fp = xfopen_for_read(name);
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47 | while ((buf = xmalloc_fgetline(fp)) != NULL) {
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48 | p = skip_whitespace(buf);
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49 | if (*p && (*p != '#')) {
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50 | bb_dump_add(dumper, p);
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51 | }
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52 | free(buf);
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53 | }
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54 | fclose(fp);
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55 | }
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56 |
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57 | static const char *const add_strings[] = {
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58 | "\"%07.7_ax \" 16/1 \"%03o \" \"\\n\"", /* b */
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59 | "\"%07.7_ax \" 16/1 \"%3_c \" \"\\n\"", /* c */
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60 | "\"%07.7_ax \" 8/2 \" %05u \" \"\\n\"", /* d */
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61 | "\"%07.7_ax \" 8/2 \" %06o \" \"\\n\"", /* o */
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62 | "\"%07.7_ax \" 8/2 \" %04x \" \"\\n\"", /* x */
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63 | };
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64 |
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65 | static const char add_first[] ALIGN1 = "\"%07.7_Ax\n\"";
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66 |
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67 | static const char hexdump_opts[] ALIGN1 = "bcdoxCe:f:n:s:v" IF_FEATURE_HEXDUMP_REVERSE("R");
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68 |
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69 | static const struct suffix_mult suffixes[] = {
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70 | { "b", 512 },
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71 | { "k", 1024 },
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72 | { "m", 1024*1024 },
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73 | { "", 0 }
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74 | };
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75 |
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76 | int hexdump_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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77 | int hexdump_main(int argc, char **argv)
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78 | {
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79 | dumper_t *dumper = alloc_dumper();
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80 | const char *p;
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81 | int ch;
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82 | #if ENABLE_FEATURE_HEXDUMP_REVERSE
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83 | FILE *fp;
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84 | smallint rdump = 0;
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85 | #endif
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86 |
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87 | if (ENABLE_HD && !applet_name[2]) { /* we are "hd" */
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88 | ch = 'C';
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89 | goto hd_applet;
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90 | }
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91 |
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92 | /* We cannot use getopt32: in hexdump options are cumulative.
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93 | * E.g. "hexdump -C -C file" should dump each line twice */
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94 | while ((ch = getopt(argc, argv, hexdump_opts)) > 0) {
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95 | p = strchr(hexdump_opts, ch);
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96 | if (!p)
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97 | bb_show_usage();
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98 | if ((p - hexdump_opts) < 5) {
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99 | bb_dump_add(dumper, add_first);
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100 | bb_dump_add(dumper, add_strings[(int)(p - hexdump_opts)]);
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101 | }
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102 | /* Save a little bit of space below by omitting the 'else's. */
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103 | if (ch == 'C') {
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104 | hd_applet:
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105 | bb_dump_add(dumper, "\"%08.8_Ax\n\"");
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106 | bb_dump_add(dumper, "\"%08.8_ax \" 8/1 \"%02x \" \" \" 8/1 \"%02x \" ");
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107 | bb_dump_add(dumper, "\" |\" 16/1 \"%_p\" \"|\\n\"");
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108 | }
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109 | if (ch == 'e') {
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110 | bb_dump_add(dumper, optarg);
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111 | } /* else */
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112 | if (ch == 'f') {
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113 | bb_dump_addfile(dumper, optarg);
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114 | } /* else */
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115 | if (ch == 'n') {
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116 | dumper->dump_length = xatoi_positive(optarg);
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117 | } /* else */
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118 | if (ch == 's') { /* compat: -s accepts hex numbers too */
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119 | dumper->dump_skip = xstrtoul_range_sfx(optarg, /*base:*/ 0, /*lo:*/ 0, /*hi:*/ LONG_MAX, suffixes);
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120 | } /* else */
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121 | if (ch == 'v') {
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122 | dumper->dump_vflag = ALL;
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123 | }
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124 | #if ENABLE_FEATURE_HEXDUMP_REVERSE
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125 | if (ch == 'R') {
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126 | rdump = 1;
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127 | }
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128 | #endif
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129 | }
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130 |
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131 | if (!dumper->fshead) {
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132 | bb_dump_add(dumper, add_first);
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133 | bb_dump_add(dumper, "\"%07.7_ax \" 8/2 \"%04x \" \"\\n\"");
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134 | }
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135 |
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136 | argv += optind;
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137 |
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138 | #if !ENABLE_FEATURE_HEXDUMP_REVERSE
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139 | return bb_dump_dump(dumper, argv);
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140 | #else
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141 | if (!rdump) {
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142 | return bb_dump_dump(dumper, argv);
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143 | }
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144 |
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145 | /* -R: reverse of 'hexdump -Cv' */
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146 | fp = stdin;
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147 | if (!*argv) {
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148 | argv--;
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149 | goto jump_in;
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150 | }
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151 |
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152 | do {
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153 | char *buf;
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154 | fp = xfopen_for_read(*argv);
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155 | jump_in:
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156 | while ((buf = xmalloc_fgetline(fp)) != NULL) {
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157 | p = buf;
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158 | while (1) {
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159 | /* skip address or previous byte */
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160 | while (isxdigit(*p)) p++;
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161 | while (*p == ' ') p++;
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162 | /* '|' char will break the line */
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163 | if (!isxdigit(*p) || sscanf(p, "%x ", &ch) != 1)
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164 | break;
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165 | putchar(ch);
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166 | }
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167 | free(buf);
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168 | }
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169 | fclose(fp);
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170 | } while (*++argv);
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171 |
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172 | fflush_stdout_and_exit(EXIT_SUCCESS);
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173 | #endif
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174 | }
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