blob: ac7e24ff88022048d5a30aebfea20b34549d75ea
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 | } |
173 |