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authorDenys Vlasenko <vda.linux@googlemail.com>2017-01-25 01:58:00 +0100
committerDenys Vlasenko <vda.linux@googlemail.com>2017-01-25 01:58:00 +0100
commit0f4364775fbc0b716024d5211325045c40b431c9 (patch)
tree9f1bbe20c313154a2f9678816e55eb1944e6a622 /util-linux/hexdump_xxd.c
parent2181fb4af8680730e0157310ffeeb3a35768beb0 (diff)
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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.c132
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
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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
58int xxd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
59int 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}