mirror of https://github.com/mirror/busybox.git
154 lines
4.3 KiB
C
154 lines
4.3 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* hexdump implementation for busybox
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* Based on code from util-linux v 2.11l
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*
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* Copyright (c) 1989
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* The Regents of the University of California. All rights reserved.
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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//config:config HEXDUMP
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//config: bool "hexdump (8.7 kb)"
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//config: default y
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//config: help
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//config: The hexdump 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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//config:
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//config:config HD
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//config: bool "hd (8.3 kb)"
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//config: default y
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//config: help
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//config: hd is an alias to hexdump -C.
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//applet:IF_HEXDUMP(APPLET_NOEXEC(hexdump, hexdump, BB_DIR_USR_BIN, BB_SUID_DROP, hexdump))
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//applet:IF_HD(APPLET_NOEXEC(hd, hexdump, BB_DIR_USR_BIN, BB_SUID_DROP, hd))
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//kbuild:lib-$(CONFIG_HEXDUMP) += hexdump.o
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//kbuild:lib-$(CONFIG_HD) += hexdump.o
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//usage:#define hexdump_trivial_usage
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//usage: "[-bcdoxCv] [-e FMT] [-f FMT_FILE] [-n LEN] [-s OFS] [FILE]..."
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//usage:#define hexdump_full_usage "\n\n"
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//usage: "Display FILEs (or stdin) in a user specified format\n"
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//usage: "\n -b 1-byte octal display"
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//usage: "\n -c 1-byte character display"
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//usage: "\n -d 2-byte decimal display"
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//usage: "\n -o 2-byte octal display"
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//usage: "\n -x 2-byte hex display"
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//usage: "\n -C hex+ASCII 16 bytes per line"
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//usage: "\n -v Show all (no dup folding)"
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//usage: "\n -e FORMAT_STR Example: '16/1 \"%02x|\"\"\\n\"'"
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//usage: "\n -f FORMAT_FILE"
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// exactly the same help text lines in hexdump and xxd:
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//usage: "\n -n LENGTH Show only first LENGTH bytes"
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//usage: "\n -s OFFSET Skip OFFSET bytes"
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//usage:
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//usage:#define hd_trivial_usage
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//usage: "FILE..."
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//usage:#define hd_full_usage "\n\n"
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//usage: "hd is an alias for hexdump -C"
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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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static void bb_dump_addfile(dumper_t *dumper, char *name)
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{
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char *p;
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FILE *fp;
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char *buf;
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fp = xfopen_for_read(name);
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while ((buf = xmalloc_fgetline(fp)) != NULL) {
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p = skip_whitespace(buf);
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if (*p && (*p != '#')) {
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bb_dump_add(dumper, p);
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}
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free(buf);
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}
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fclose(fp);
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}
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static const char *const add_strings[] ALIGN_PTR = {
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"16/1 \" %03o" , /* b */
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"16/1 \" %3_c" , /* c */
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"8/2 \" %05u" , /* d */
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"8/2 \" %06o" , /* o */
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"8/2 \" %04x", /* x */
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};
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static void add_format(dumper_t *dumper, const char *fmt)
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{
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char fmtbuf[sizeof("\"%07_ax\"" "%s\"" "\"\n\"") + 16];
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sprintf(fmtbuf, "\"%%07_ax\"" "%s\"" "\"\n\"", fmt);
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bb_dump_add(dumper, "\"%07_Ax\n\"");
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bb_dump_add(dumper, fmtbuf);
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}
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static const char hexdump_opts[] ALIGN1 = "bcdoxCe:f:n:s:v";
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int hexdump_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int hexdump_main(int argc, char **argv)
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{
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dumper_t *dumper = alloc_dumper();
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const char *p;
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int ch;
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if (ENABLE_HD
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&& (!ENABLE_HEXDUMP || !applet_name[2])
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) { /* we are "hd" */
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ch = 'C';
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goto hd_applet;
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}
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/* We cannot use getopt32: in hexdump options are cumulative.
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* E.g. "hexdump -C -C file" should dump each line twice */
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while ((ch = getopt(argc, argv, hexdump_opts)) > 0) {
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p = strchr(hexdump_opts, ch);
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if (!p)
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bb_show_usage();
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if ((p - hexdump_opts) < 5) {
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add_format(dumper, add_strings[(int)(p - hexdump_opts)]);
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}
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/* Save a little bit of space below by omitting the 'else's. */
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if (ch == 'C') {
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hd_applet:
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bb_dump_add(dumper, "\"%08_Ax\n\""); // final address line after dump
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//------------------- "address " 8 * " xx" " " 8 * " xx"
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bb_dump_add(dumper, "\"%08_ax \"8/1 \" %02x\"\" \"8/1 \" %02x\"");
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//------------------- " |ASCII...........|\n"
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bb_dump_add(dumper, "\" |\"16/1 \"%_p\"\"|\n\"");
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}
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if (ch == 'e') {
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bb_dump_add(dumper, optarg);
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} /* else */
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if (ch == 'f') {
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bb_dump_addfile(dumper, optarg);
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} /* else */
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if (ch == 'n') {
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dumper->dump_length = xatoi_positive(optarg);
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} /* else */
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if (ch == 's') { /* compat: -s accepts hex numbers too */
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dumper->dump_skip = xstrtoull_range_sfx(
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optarg,
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/*base:*/ 0,
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/*lo:*/ 0, /*hi:*/ OFF_T_MAX,
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bkm_suffixes
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);
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} /* else */
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if (ch == 'v') {
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dumper->dump_vflag = ALL;
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}
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}
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if (!dumper->fshead) {
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add_format(dumper, "8/2 \" %04x");
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}
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argv += optind;
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return bb_dump_dump(dumper, argv);
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}
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