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