1 /* vi: set sw=4 ts=4: */
3 * hexdump implementation for busybox
4 * Based on code from util-linux v 2.11l
7 * The Regents of the University of California. All rights reserved.
9 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
11 //config:config HEXDUMP
12 //config: bool "hexdump"
15 //config: The hexdump utility is used to display binary data in a readable
16 //config: way that is comparable to the output from most hex editors.
18 //config:config FEATURE_HEXDUMP_REVERSE
19 //config: bool "Support -R, reverse of 'hexdump -Cv'"
21 //config: depends on HEXDUMP
23 //config: The hexdump utility is used to display binary data in an ascii
24 //config: readable way. This option creates binary data from an ascii input.
25 //config: NB: this option is non-standard. It's unwise to use it in scripts
26 //config: aimed to be portable.
32 //config: hd is an alias to hexdump -C.
34 //applet:IF_HEXDUMP(APPLET_NOEXEC(hexdump, hexdump, BB_DIR_USR_BIN, BB_SUID_DROP, hexdump))
35 //applet:IF_HD(APPLET_NOEXEC(hd, hexdump, BB_DIR_USR_BIN, BB_SUID_DROP, hd))
37 //kbuild:lib-$(CONFIG_HEXDUMP) += hexdump.o
38 //kbuild:lib-$(CONFIG_HD) += hexdump.o
40 //usage:#define hexdump_trivial_usage
41 //usage: "[-bcCdefnosvx" IF_FEATURE_HEXDUMP_REVERSE("R") "] [FILE]..."
42 //usage:#define hexdump_full_usage "\n\n"
43 //usage: "Display FILEs (or stdin) in a user specified format\n"
44 //usage: "\n -b One-byte octal display"
45 //usage: "\n -c One-byte character display"
46 //usage: "\n -C Canonical hex+ASCII, 16 bytes per line"
47 //usage: "\n -d Two-byte decimal display"
48 //usage: "\n -e FORMAT_STRING"
49 //usage: "\n -f FORMAT_FILE"
50 //usage: "\n -n LENGTH Interpret only LENGTH bytes of input"
51 //usage: "\n -o Two-byte octal display"
52 //usage: "\n -s OFFSET Skip OFFSET bytes"
53 //usage: "\n -v Display all input data"
54 //usage: "\n -x Two-byte hexadecimal display"
55 //usage: IF_FEATURE_HEXDUMP_REVERSE(
56 //usage: "\n -R Reverse of 'hexdump -Cv'")
58 //usage:#define hd_trivial_usage
60 //usage:#define hd_full_usage "\n\n"
61 //usage: "hd is an alias for hexdump -C"
66 /* This is a NOEXEC applet. Be very careful! */
68 static void bb_dump_addfile(dumper_t *dumper, char *name)
74 fp = xfopen_for_read(name);
75 while ((buf = xmalloc_fgetline(fp)) != NULL) {
76 p = skip_whitespace(buf);
77 if (*p && (*p != '#')) {
78 bb_dump_add(dumper, p);
85 static const char *const add_strings[] = {
86 "\"%07.7_ax \" 16/1 \"%03o \" \"\\n\"", /* b */
87 "\"%07.7_ax \" 16/1 \"%3_c \" \"\\n\"", /* c */
88 "\"%07.7_ax \" 8/2 \" %05u \" \"\\n\"", /* d */
89 "\"%07.7_ax \" 8/2 \" %06o \" \"\\n\"", /* o */
90 "\"%07.7_ax \" 8/2 \" %04x \" \"\\n\"", /* x */
93 static const char add_first[] ALIGN1 = "\"%07.7_Ax\n\"";
95 static const char hexdump_opts[] ALIGN1 = "bcdoxCe:f:n:s:v" IF_FEATURE_HEXDUMP_REVERSE("R");
97 int hexdump_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
98 int hexdump_main(int argc, char **argv)
100 dumper_t *dumper = alloc_dumper();
103 #if ENABLE_FEATURE_HEXDUMP_REVERSE
109 && (!ENABLE_HEXDUMP || !applet_name[2])
110 ) { /* we are "hd" */
115 /* We cannot use getopt32: in hexdump options are cumulative.
116 * E.g. "hexdump -C -C file" should dump each line twice */
117 while ((ch = getopt(argc, argv, hexdump_opts)) > 0) {
118 p = strchr(hexdump_opts, ch);
121 if ((p - hexdump_opts) < 5) {
122 bb_dump_add(dumper, add_first);
123 bb_dump_add(dumper, add_strings[(int)(p - hexdump_opts)]);
125 /* Save a little bit of space below by omitting the 'else's. */
128 bb_dump_add(dumper, "\"%08.8_Ax\n\"");
129 bb_dump_add(dumper, "\"%08.8_ax \" 8/1 \"%02x \" \" \" 8/1 \"%02x \" ");
130 bb_dump_add(dumper, "\" |\" 16/1 \"%_p\" \"|\\n\"");
133 bb_dump_add(dumper, optarg);
136 bb_dump_addfile(dumper, optarg);
139 dumper->dump_length = xatoi_positive(optarg);
141 if (ch == 's') { /* compat: -s accepts hex numbers too */
142 dumper->dump_skip = xstrtoull_range_sfx(
145 /*lo:*/ 0, /*hi:*/ OFF_T_MAX,
150 dumper->dump_vflag = ALL;
152 #if ENABLE_FEATURE_HEXDUMP_REVERSE
159 if (!dumper->fshead) {
160 bb_dump_add(dumper, add_first);
161 bb_dump_add(dumper, "\"%07.7_ax \" 8/2 \"%04x \" \"\\n\"");
166 #if !ENABLE_FEATURE_HEXDUMP_REVERSE
167 return bb_dump_dump(dumper, argv);
170 return bb_dump_dump(dumper, argv);
173 /* -R: reverse of 'hexdump -Cv' */
182 fp = xfopen_for_read(*argv);
184 while ((buf = xmalloc_fgetline(fp)) != NULL) {
187 /* skip address or previous byte */
188 while (isxdigit(*p)) p++;
189 while (*p == ' ') p++;
190 /* '|' char will break the line */
191 if (!isxdigit(*p) || sscanf(p, "%x ", &ch) != 1)
200 fflush_stdout_and_exit(EXIT_SUCCESS);