hexdump.c

这是一个SIGMA方案的PMP播放器的UCLINUX程序,可播放DVD,VCD,CD MP3...有很好的参考价值.

/*
 * 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.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 * Original copyright notice is retained at the end of this file.
 */

#include <getopt.h>
#include <stdlib.h>
#include <string.h>
#include "dump.h"
#include "busybox.h"

extern off_t skip;                      /* bytes to skip */

extern FS *fshead;				/* head of format strings */
extern int blocksize;				/* data block size */
extern int length;			/* max bytes to read */

void addfile(char *name)
{
	register char *p;
	FILE *fp;
	int ch;
	char buf[2048 + 1];

	if (!(fp = fopen(name, "r"))) {
		error_msg_and_die("hexdump: can't read %s.\n", name);
	}
	while (fgets(buf, sizeof(buf), fp)) {
		if (!(p = index(buf, '\n'))) {
			error_msg("hexdump: line too long.\n");
			while ((ch = getchar()) != '\n' && ch != EOF);
			continue;
		}
		*p = '\0';
		for (p = buf; *p && isspace(*p); ++p);
		if (!*p || *p == '#') {
			continue;
		}
		add(p);
	}
	(void)fclose(fp);
}

int hexdump_main(int argc, char **argv)
{
//	register FS *tfs;
	char *p;
	int ch;
	extern enum _vflag vflag;
	vflag = FIRST;
	length = -1;

	while ((ch = getopt(argc, argv, "bcde:f:n:os:vx")) != EOF) {
		switch (ch) {
		case 'b':
			add("\"%07.7_Ax\n\"");
			add("\"%07.7_ax \" 16/1 \"%03o \" \"\\n\"");
			break;
		case 'c':
			add("\"%07.7_Ax\n\"");
			add("\"%07.7_ax \" 16/1 \"%3_c \" \"\\n\"");
			break;
		case 'd':
			add("\"%07.7_Ax\n\"");
			add("\"%07.7_ax \" 8/2 \"  %05u \" \"\\n\"");
			break;
		case 'e':
			add(optarg);
			break;
		case 'f':
			addfile(optarg);
			break;
		case 'n':
			if ((length = atoi(optarg)) < 0) {
				error_msg_and_die("hexdump: bad length value.\n");
			}
			break;
		case 'o':
			add("\"%07.7_Ax\n\"");
			add("\"%07.7_ax \" 8/2 \" %06o \" \"\\n\"");
			break;
		case 's':
			if ((skip = strtol(optarg, &p, 0)) < 0) {
				error_msg_and_die("hexdump: bad skip value.\n");
			}
			switch(*p) {
				case 'b':
					skip *= 512;
					break;
				case 'k':
					skip *= 1024;
					break;
				case 'm':
					skip *= 1048576;
					break;
			}
			break;
		case 'v':
			vflag = ALL;
			break;
		case 'x':
			add("\"%07.7_Ax\n\"");
			add("\"%07.7_ax \" 8/2 \"   %04x \" \"\\n\"");
			break;
		case '?':
			show_usage();
		}
	}

	if (!fshead) {
		add("\"%07.7_Ax\n\"");
		add("\"%07.7_ax \" 8/2 \"%04x \" \"\\n\"");
	}

	argv += optind;

	return(dump(argv));
}
/*
 * Copyright (c) 1989 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */