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author | Denys Vlasenko <vda.linux@googlemail.com> | 2017-01-25 01:58:00 +0100 |
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committer | Denys Vlasenko <vda.linux@googlemail.com> | 2017-01-25 01:58:00 +0100 |
commit | 0f4364775fbc0b716024d5211325045c40b431c9 (patch) | |
tree | 9f1bbe20c313154a2f9678816e55eb1944e6a622 /util-linux/hexdump_xxd.c | |
parent | 2181fb4af8680730e0157310ffeeb3a35768beb0 (diff) | |
download | busybox-w32-0f4364775fbc0b716024d5211325045c40b431c9.tar.gz busybox-w32-0f4364775fbc0b716024d5211325045c40b431c9.tar.bz2 busybox-w32-0f4364775fbc0b716024d5211325045c40b431c9.zip |
xxd: new applet
Yet Another Hexdumper
function old new delta
xxd_main - 364 +364
packed_usage 31046 31116 +70
applet_names 2560 2564 +4
applet_main 1476 1480 +4
rewrite 1022 1013 -9
------------------------------------------------------------------------------
(add/remove: 2/0 grow/shrink: 3/1 up/down: 442/-9) Total: 433 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'util-linux/hexdump_xxd.c')
-rw-r--r-- | util-linux/hexdump_xxd.c | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/util-linux/hexdump_xxd.c b/util-linux/hexdump_xxd.c new file mode 100644 index 000000000..3a7e64bb9 --- /dev/null +++ b/util-linux/hexdump_xxd.c | |||
@@ -0,0 +1,132 @@ | |||
1 | /* vi: set sw=4 ts=4: */ | ||
2 | /* | ||
3 | * xxd implementation for busybox | ||
4 | * | ||
5 | * Copyright (c) 2017 Denys Vlasenko <vda.linux@gmail.com> | ||
6 | * | ||
7 | * Licensed under GPLv2, see file LICENSE in this source tree. | ||
8 | */ | ||
9 | //config:config XXD | ||
10 | //config: bool "xxd" | ||
11 | //config: default y | ||
12 | //config: help | ||
13 | //config: The xxd utility is used to display binary data in a readable | ||
14 | //config: way that is comparable to the output from most hex editors. | ||
15 | |||
16 | //applet:IF_XXD(APPLET_NOEXEC(xxd, xxd, BB_DIR_USR_BIN, BB_SUID_DROP, xxd)) | ||
17 | |||
18 | //kbuild:lib-$(CONFIG_XXD) += hexdump_xxd.o | ||
19 | |||
20 | // $ xxd --version | ||
21 | // xxd V1.10 27oct98 by Juergen Weigert | ||
22 | // $ xxd --help | ||
23 | // Usage: | ||
24 | // xxd [options] [infile [outfile]] | ||
25 | // or | ||
26 | // xxd -r [-s [-]offset] [-c cols] [-ps] [infile [outfile]] | ||
27 | // Options: | ||
28 | // -a toggle autoskip: A single '*' replaces nul-lines. Default off. | ||
29 | // -b binary digit dump (incompatible with -ps,-i,-r). Default hex. | ||
30 | // -c cols format <cols> octets per line. Default 16 (-i: 12, -ps: 30). | ||
31 | // -E show characters in EBCDIC. Default ASCII. | ||
32 | // -e little-endian dump (incompatible with -ps,-i,-r). | ||
33 | // -g number of octets per group in normal output. Default 2 (-e: 4). | ||
34 | // -i output in C include file style. | ||
35 | // -l len stop after <len> octets. | ||
36 | // -o off add <off> to the displayed file position. | ||
37 | // -ps output in postscript plain hexdump style. | ||
38 | // -r reverse operation: convert (or patch) hexdump into binary. | ||
39 | // -r -s off revert with <off> added to file positions found in hexdump. | ||
40 | // -s [+][-]seek start at <seek> bytes abs. (or +: rel.) infile offset. | ||
41 | // -u use upper case hex letters. | ||
42 | |||
43 | //usage:#define xxd_trivial_usage | ||
44 | //usage: "[OPTIONS] [FILE]" | ||
45 | //usage:#define xxd_full_usage "\n\n" | ||
46 | //usage: "Hex dump FILE (or stdin)\n" | ||
47 | //usage: "\n -g N Bytes per group" | ||
48 | //usage: "\n -c N Bytes per line" | ||
49 | // exactly the same help text lines in hexdump and xxd: | ||
50 | //usage: "\n -l LENGTH Interpret only LENGTH bytes of input" | ||
51 | //usage: "\n -s OFFSET Skip OFFSET bytes" | ||
52 | |||
53 | #include "libbb.h" | ||
54 | #include "dump.h" | ||
55 | |||
56 | /* This is a NOEXEC applet. Be very careful! */ | ||
57 | |||
58 | int xxd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; | ||
59 | int xxd_main(int argc UNUSED_PARAM, char **argv) | ||
60 | { | ||
61 | char buf[80]; | ||
62 | dumper_t *dumper; | ||
63 | char *opt_l, *opt_s; | ||
64 | unsigned bytes = 2; | ||
65 | unsigned cols = 0; | ||
66 | unsigned opt; | ||
67 | |||
68 | dumper = alloc_dumper(); | ||
69 | |||
70 | #define OPT_l (1 << 0) | ||
71 | #define OPT_s (1 << 1) | ||
72 | #define OPT_a (1 << 2) | ||
73 | opt_complementary = "?1"; /* 1 argument max */ | ||
74 | opt = getopt32(argv, "l:s:ag:+c:+", &opt_l, &opt_s, &bytes, &cols); | ||
75 | argv += optind; | ||
76 | |||
77 | // dumper->dump_vflag = ALL; // default | ||
78 | // if (opt & OPT_a) | ||
79 | // dumper->dump_vflag = SKIPNUL; ..does not exist | ||
80 | if (opt & OPT_l) { | ||
81 | dumper->dump_length = xstrtou_range( | ||
82 | opt_l, | ||
83 | /*base:*/ 0, | ||
84 | /*lo:*/ 0, /*hi:*/ INT_MAX | ||
85 | ); | ||
86 | } | ||
87 | if (opt & OPT_s) { | ||
88 | dumper->dump_skip = xstrtoull_range( | ||
89 | opt_s, | ||
90 | /*base:*/ 0, | ||
91 | /*lo:*/ 0, /*hi:*/ OFF_T_MAX | ||
92 | ); | ||
93 | //BUGGY for /proc/version (unseekable?) | ||
94 | } | ||
95 | |||
96 | bb_dump_add(dumper, "\"%08.8_ax: \""); // "address: " | ||
97 | if (cols == 0) | ||
98 | cols = 16; | ||
99 | if (bytes < 1 || bytes >= cols) { | ||
100 | sprintf(buf, "%u/1 \"%%02x\"", cols); // cols * "xx" | ||
101 | bb_dump_add(dumper, buf); | ||
102 | } | ||
103 | else if (bytes == 1) { | ||
104 | sprintf(buf, "%u/1 \"%%02x \"", cols); // cols * "xx " | ||
105 | bb_dump_add(dumper, buf); | ||
106 | } | ||
107 | else { | ||
108 | /* Format "print byte" with and without trailing space */ | ||
109 | #define BS "/1 \"%02x \"" | ||
110 | #define B "/1 \"%02x\"" | ||
111 | unsigned i; | ||
112 | char *bigbuf = xmalloc(1 + cols * (sizeof(BS)-1)); | ||
113 | char *p = bigbuf; | ||
114 | for (i = 1; i <= cols; i++) { | ||
115 | if (i == cols || i % bytes) | ||
116 | p = stpcpy(p, B); | ||
117 | else | ||
118 | p = stpcpy(p, BS); | ||
119 | } | ||
120 | // for -g3, this results in B B BS B B BS... B = "xxxxxx xxxxxx .....xx" | ||
121 | // todo: can be more clever and use | ||
122 | // one "cols-1/B" format instead of many "B B B..." formats | ||
123 | //bb_error_msg("ADDED:'%s'", bigbuf); | ||
124 | bb_dump_add(dumper, bigbuf); | ||
125 | free(bigbuf); | ||
126 | } | ||
127 | |||
128 | sprintf(buf, "\" \" %u/1 \"%%_p\" \"\n\"", cols); // " ASCII\n" | ||
129 | bb_dump_add(dumper, buf); | ||
130 | |||
131 | return bb_dump_dump(dumper, argv); | ||
132 | } | ||