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/* vi: set sw=4 ts=4: */
/*
* hexdump implementation for busybox
* Based on code from util-linux v 2.11l
*
* Copyright (c) 1989
* The Regents of the University of California. All rights reserved.
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
//config:config HEXDUMP
//config: bool "hexdump"
//config: default y
//config: help
//config: The hexdump utility is used to display binary data in a readable
//config: way that is comparable to the output from most hex editors.
//config:
//config:config FEATURE_HEXDUMP_REVERSE
//config: bool "Support -R, reverse of 'hexdump -Cv'"
//config: default y
//config: depends on HEXDUMP
//config: help
//config: The hexdump utility is used to display binary data in an ascii
//config: readable way. This option creates binary data from an ascii input.
//config: NB: this option is non-standard. It's unwise to use it in scripts
//config: aimed to be portable.
//config:
//config:config HD
//config: bool "hd"
//config: default y
//config: help
//config: hd is an alias to hexdump -C.
//applet:IF_HEXDUMP(APPLET_NOEXEC(hexdump, hexdump, BB_DIR_USR_BIN, BB_SUID_DROP, hexdump))
//applet:IF_HD(APPLET_NOEXEC(hd, hexdump, BB_DIR_USR_BIN, BB_SUID_DROP, hd))
//kbuild:lib-$(CONFIG_HEXDUMP) += hexdump.o
//kbuild:lib-$(CONFIG_HD) += hexdump.o
//usage:#define hexdump_trivial_usage
//usage: "[-bcCdefnosvx" IF_FEATURE_HEXDUMP_REVERSE("R") "] [FILE]..."
//usage:#define hexdump_full_usage "\n\n"
//usage: "Display FILEs (or stdin) in a user specified format\n"
//usage: "\n -b One-byte octal display"
//usage: "\n -c One-byte character display"
//usage: "\n -C Canonical hex+ASCII, 16 bytes per line"
//usage: "\n -d Two-byte decimal display"
//usage: "\n -e FORMAT_STRING"
//usage: "\n -f FORMAT_FILE"
// exactly the same help text lines in hexdump and xxd:
//usage: "\n -n LENGTH Interpret only LENGTH bytes of input"
//usage: "\n -o Two-byte octal display"
//usage: "\n -s OFFSET Skip OFFSET bytes"
//usage: "\n -v Display all input data"
//usage: "\n -x Two-byte hexadecimal display"
//usage: IF_FEATURE_HEXDUMP_REVERSE(
//usage: "\n -R Reverse of 'hexdump -Cv'")
//usage:
//usage:#define hd_trivial_usage
//usage: "FILE..."
//usage:#define hd_full_usage "\n\n"
//usage: "hd is an alias for hexdump -C"
#include "libbb.h"
#include "dump.h"
/* This is a NOEXEC applet. Be very careful! */
static void bb_dump_addfile(dumper_t *dumper, char *name)
{
char *p;
FILE *fp;
char *buf;
fp = xfopen_for_read(name);
while ((buf = xmalloc_fgetline(fp)) != NULL) {
p = skip_whitespace(buf);
if (*p && (*p != '#')) {
bb_dump_add(dumper, p);
}
free(buf);
}
fclose(fp);
}
static const char *const add_strings[] = {
"\"%07.7_ax \"16/1 \"%03o \"\"\n\"", /* b */
"\"%07.7_ax \"16/1 \"%3_c \"\"\n\"", /* c */
"\"%07.7_ax \"8/2 \" %05u \"\"\n\"", /* d */
"\"%07.7_ax \"8/2 \" %06o \"\"\n\"", /* o */
"\"%07.7_ax \"8/2 \" %04x \"\"\n\"", /* x */
};
static const char add_first[] ALIGN1 = "\"%07.7_Ax\n\"";
static const char hexdump_opts[] ALIGN1 = "bcdoxCe:f:n:s:v" IF_FEATURE_HEXDUMP_REVERSE("R");
int hexdump_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int hexdump_main(int argc, char **argv)
{
dumper_t *dumper = alloc_dumper();
const char *p;
int ch;
#if ENABLE_FEATURE_HEXDUMP_REVERSE
FILE *fp;
smallint rdump = 0;
#endif
if (ENABLE_HD
&& (!ENABLE_HEXDUMP || !applet_name[2])
) { /* we are "hd" */
ch = 'C';
goto hd_applet;
}
/* We cannot use getopt32: in hexdump options are cumulative.
* E.g. "hexdump -C -C file" should dump each line twice */
while ((ch = getopt(argc, argv, hexdump_opts)) > 0) {
p = strchr(hexdump_opts, ch);
if (!p)
bb_show_usage();
if ((p - hexdump_opts) < 5) {
bb_dump_add(dumper, add_first);
bb_dump_add(dumper, add_strings[(int)(p - hexdump_opts)]);
}
/* Save a little bit of space below by omitting the 'else's. */
if (ch == 'C') {
hd_applet:
bb_dump_add(dumper, "\"%08.8_Ax\n\""); // final address line after dump
//------------------- "address " 8 * "xx " " " 8 * "xx "
bb_dump_add(dumper, "\"%08.8_ax \"8/1 \"%02x \" \" \"8/1 \"%02x \"");
//------------------- " |ASCII...........|\n"
bb_dump_add(dumper, "\" |\"16/1 \"%_p\"\"|\n\"");
}
if (ch == 'e') {
bb_dump_add(dumper, optarg);
} /* else */
if (ch == 'f') {
bb_dump_addfile(dumper, optarg);
} /* else */
if (ch == 'n') {
dumper->dump_length = xatoi_positive(optarg);
} /* else */
if (ch == 's') { /* compat: -s accepts hex numbers too */
dumper->dump_skip = xstrtoull_range_sfx(
optarg,
/*base:*/ 0,
/*lo:*/ 0, /*hi:*/ OFF_T_MAX,
bkm_suffixes
);
} /* else */
if (ch == 'v') {
dumper->dump_vflag = ALL;
}
#if ENABLE_FEATURE_HEXDUMP_REVERSE
if (ch == 'R') {
rdump = 1;
}
#endif
}
if (!dumper->fshead) {
bb_dump_add(dumper, add_first);
bb_dump_add(dumper, "\"%07.7_ax \"8/2 \"%04x \"\"\n\"");
}
argv += optind;
#if !ENABLE_FEATURE_HEXDUMP_REVERSE
return bb_dump_dump(dumper, argv);
#else
if (!rdump) {
return bb_dump_dump(dumper, argv);
}
/* -R: reverse of 'hexdump -Cv' */
fp = stdin;
if (!*argv) {
argv--;
goto jump_in;
}
do {
char *buf;
fp = xfopen_for_read(*argv);
jump_in:
while ((buf = xmalloc_fgetline(fp)) != NULL) {
p = buf;
while (1) {
/* skip address or previous byte */
while (isxdigit(*p)) p++;
while (*p == ' ') p++;
/* '|' char will break the line */
if (!isxdigit(*p) || sscanf(p, "%x ", &ch) != 1)
break;
putchar(ch);
}
free(buf);
}
fclose(fp);
} while (*++argv);
fflush_stdout_and_exit(EXIT_SUCCESS);
#endif
}
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