util-linux/hexdump.c

/* 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 tarball for details.
 */

#include <getopt.h>
#include "libbb.h"
#include "dump.h"

/* This is a NOEXEC applet. Be very careful! */


static void bb_dump_addfile(char *name)
{
	char *p;
	FILE *fp;
	char *buf;

	fp = xfopen(name, "r");

	while ((buf = xmalloc_getline(fp)) != NULL) {
		p = skip_whitespace(buf);

		if (*p && (*p != '#')) {
			bb_dump_add(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";

static const struct suffix_mult suffixes[] = {
	{ "b", 512 },
	{ "k", 1024 },
	{ "m", 1024*1024 },
	{ }
};

int hexdump_main(int argc, char **argv);
int hexdump_main(int argc, char **argv)
{
	const char *p;
	int ch;

	bb_dump_vflag = FIRST;
	bb_dump_length = -1;

	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(add_first);
			bb_dump_add(add_strings[(int)(p - hexdump_opts)]);
		} else if (ch == 'C') {
			bb_dump_add("\"%08.8_Ax\n\"");
			bb_dump_add("\"%08.8_ax  \" 8/1 \"%02x \" \"  \" 8/1 \"%02x \" ");
			bb_dump_add("\"  |\" 16/1 \"%_p\" \"|\\n\"");
		} else {
			/* Save a little bit of space below by omitting the 'else's. */
			if (ch == 'e') {
				bb_dump_add(optarg);
			} /* else */
			if (ch == 'f') {
				bb_dump_addfile(optarg);
			} /* else */
			if (ch == 'n') {
				bb_dump_length = xatoi_u(optarg);
			} /* else */
			if (ch == 's') {
				bb_dump_skip = xatoul_range_sfx(optarg, 0, LONG_MAX, suffixes);
			} /* else */
			if (ch == 'v') {
				bb_dump_vflag = ALL;
			}
		}
	}

	if (!bb_dump_fshead) {
		bb_dump_add(add_first);
		bb_dump_add("\"%07.7_ax \" 8/2 \"%04x \" \"\\n\"");
	}

	argv += optind;

	return bb_dump_dump(argv);
}