xref: /freebsd/usr.bin/hexdump/hexdump.c (revision 069ac184)
1 /*-
2  * SPDX-License-Identifier: BSD-3-Clause
3  *
4  * Copyright (c) 1989, 1993
5  *	The Regents of the University of California.  All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  * 3. Neither the name of the University nor the names of its contributors
16  *    may be used to endorse or promote products derived from this software
17  *    without specific prior written permission.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29  * SUCH DAMAGE.
30  */
31 
32 #include <sys/types.h>
33 #include <sys/capsicum.h>
34 #include <capsicum_helpers.h>
35 #include <err.h>
36 #include <locale.h>
37 #include <stdlib.h>
38 #include <stdio.h>
39 #include <string.h>
40 #include "hexdump.h"
41 
42 FS *fshead;				/* head of format strings */
43 int blocksize;				/* data block size */
44 int exitval;				/* final exit value */
45 int length = -1;			/* max bytes to read */
46 
47 int
48 main(int argc, char *argv[])
49 {
50 	FS *tfs;
51 	char *p;
52 
53 	(void)setlocale(LC_ALL, "");
54 
55 	if (!(p = strrchr(argv[0], 'o')) || strcmp(p, "od"))
56 		newsyntax(argc, &argv);
57 	else
58 		oldsyntax(argc, &argv);
59 
60 	/* figure out the data block size */
61 	for (blocksize = 0, tfs = fshead; tfs; tfs = tfs->nextfs) {
62 		tfs->bcnt = size(tfs);
63 		if (blocksize < tfs->bcnt)
64 			blocksize = tfs->bcnt;
65 	}
66 	/* rewrite the rules, do syntax checking */
67 	for (tfs = fshead; tfs; tfs = tfs->nextfs)
68 		rewrite(tfs);
69 
70 	/*
71 	 * Cache NLS data, for strerror, for err(3), before entering capability
72 	 * mode.
73 	 */
74 	caph_cache_catpages();
75 	if (caph_limit_stdio() < 0)
76 		err(1, "capsicum");
77 
78 	(void)next(argv);
79 	display();
80 	exit(exitval);
81 }
82