147 lines
4.3 KiB
C
147 lines
4.3 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* xxd implementation for busybox
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*
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* Copyright (c) 2017 Denys Vlasenko <vda.linux@gmail.com>
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*
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* Licensed under GPLv2, see file LICENSE in this source tree.
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*/
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//config:config XXD
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//config: bool "xxd (8.9 kb)"
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//config: default y
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//config: help
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//config: The xxd utility is used to display binary data in a readable
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//config: way that is comparable to the output from most hex editors.
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//applet:IF_XXD(APPLET_NOEXEC(xxd, xxd, BB_DIR_USR_BIN, BB_SUID_DROP, xxd))
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//kbuild:lib-$(CONFIG_XXD) += hexdump_xxd.o
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// $ xxd --version
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// xxd V1.10 27oct98 by Juergen Weigert
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// $ xxd --help
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// Usage:
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// xxd [options] [infile [outfile]]
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// or
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// xxd -r [-s [-]offset] [-c cols] [-ps] [infile [outfile]]
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// Options:
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// -a toggle autoskip: A single '*' replaces nul-lines. Default off.
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// -b binary digit dump (incompatible with -ps,-i,-r). Default hex.
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// -c cols format <cols> octets per line. Default 16 (-i: 12, -ps: 30).
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// -E show characters in EBCDIC. Default ASCII.
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// -e little-endian dump (incompatible with -ps,-i,-r).
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// -g number of octets per group in normal output. Default 2 (-e: 4).
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// -i output in C include file style.
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// -l len stop after <len> octets.
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// -o off add <off> to the displayed file position.
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// -ps output in postscript plain hexdump style.
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// -r reverse operation: convert (or patch) hexdump into binary.
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// -r -s off revert with <off> added to file positions found in hexdump.
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// -s [+][-]seek start at <seek> bytes abs. (or +: rel.) infile offset.
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// -u use upper case hex letters.
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//usage:#define xxd_trivial_usage
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//usage: "[OPTIONS] [FILE]"
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//usage:#define xxd_full_usage "\n\n"
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//usage: "Hex dump FILE (or stdin)\n"
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//usage: "\n -g N Bytes per group"
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//usage: "\n -c N Bytes per line"
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//usage: "\n -p Show only hex bytes, assumes -c30"
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// exactly the same help text lines in hexdump and xxd:
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//usage: "\n -l LENGTH Show only first LENGTH bytes"
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//usage: "\n -s OFFSET Skip OFFSET bytes"
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// TODO: implement -r (see hexdump -R)
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#include "libbb.h"
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#include "dump.h"
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/* This is a NOEXEC applet. Be very careful! */
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int xxd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int xxd_main(int argc UNUSED_PARAM, char **argv)
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{
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char buf[80];
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dumper_t *dumper;
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char *opt_l, *opt_s;
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unsigned bytes = 2;
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unsigned cols = 0;
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unsigned opt;
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dumper = alloc_dumper();
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#define OPT_l (1 << 0)
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#define OPT_s (1 << 1)
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#define OPT_a (1 << 2)
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#define OPT_p (1 << 3)
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opt_complementary = "?1"; /* 1 argument max */
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opt = getopt32(argv, "l:s:apg:+c:+", &opt_l, &opt_s, &bytes, &cols);
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argv += optind;
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dumper->dump_vflag = ALL;
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// if (opt & OPT_a)
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// dumper->dump_vflag = SKIPNUL; ..does not exist
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if (opt & OPT_l) {
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dumper->dump_length = xstrtou_range(
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opt_l,
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/*base:*/ 0,
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/*lo:*/ 0, /*hi:*/ INT_MAX
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);
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}
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if (opt & OPT_s) {
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dumper->dump_skip = xstrtoull_range(
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opt_s,
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/*base:*/ 0,
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/*lo:*/ 0, /*hi:*/ OFF_T_MAX
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);
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//BUGGY for /proc/version (unseekable?)
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}
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if (opt & OPT_p) {
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if (cols == 0)
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cols = 30;
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bytes = cols; /* -p ignores -gN */
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} else {
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if (cols == 0)
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cols = 16;
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bb_dump_add(dumper, "\"%08.8_ax: \""); // "address: "
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}
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if (bytes < 1 || bytes >= cols) {
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sprintf(buf, "%u/1 \"%%02x\"", cols); // cols * "xx"
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bb_dump_add(dumper, buf);
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}
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else if (bytes == 1) {
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sprintf(buf, "%u/1 \"%%02x \"", cols); // cols * "xx "
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bb_dump_add(dumper, buf);
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}
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else {
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/* Format "print byte" with and without trailing space */
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#define BS "/1 \"%02x \""
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#define B "/1 \"%02x\""
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unsigned i;
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char *bigbuf = xmalloc(cols * (sizeof(BS)-1));
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char *p = bigbuf;
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for (i = 1; i <= cols; i++) {
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if (i == cols || i % bytes)
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p = stpcpy(p, B);
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else
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p = stpcpy(p, BS);
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}
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// for -g3, this results in B B BS B B BS... B = "xxxxxx xxxxxx .....xx"
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// todo: can be more clever and use
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// one 'bytes-1/1 "%02x"' format instead of many "B B B..." formats
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//bb_error_msg("ADDED:'%s'", bigbuf);
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bb_dump_add(dumper, bigbuf);
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free(bigbuf);
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}
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if (!(opt & OPT_p)) {
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sprintf(buf, "\" \"%u/1 \"%%_p\"\"\n\"", cols); // " ASCII\n"
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bb_dump_add(dumper, buf);
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} else {
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bb_dump_add(dumper, "\"\n\"");
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}
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return bb_dump_dump(dumper, argv);
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}
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