xref: /openbsd-src/usr.bin/hexdump/hexdump.c (revision e3c8d195a848311bd1d901316991955cb49ed6c4)
1 /*	$OpenBSD: hexdump.c,v 1.20 2016/02/08 21:05:51 mmcc Exp $	*/
2 /*	$NetBSD: hexdump.c,v 1.7 1997/10/19 02:34:06 lukem Exp $	*/
3 
4 /*
5  * Copyright (c) 1989, 1993
6  *	The Regents of the University of California.  All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  * 3. Neither the name of the University nor the names of its contributors
17  *    may be used to endorse or promote products derived from this software
18  *    without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30  * SUCH DAMAGE.
31  */
32 
33 #include <err.h>
34 #include <stdio.h>
35 #include <stdlib.h>
36 #include <unistd.h>
37 #include <string.h>
38 #include "hexdump.h"
39 
40 #define MINIMUM(a, b)	(((a) < (b)) ? (a) : (b))
41 
42 FS *fshead;				/* head of format strings */
43 int blocksize;				/* data block size */
44 int exitval;				/* final exit value */
45 long length = -1;			/* max bytes to read */
46 char *iobuf;				/* stdio I/O buffer */
47 size_t iobufsiz;			/* size of stdio I/O buffer */
48 
49 int
main(int argc,char * argv[])50 main(int argc, char *argv[])
51 {
52 	FS *tfs;
53 	char *p;
54 
55 	if (pledge("stdio rpath", NULL) == -1)
56 		err(1, "pledge");
57 
58 	if (!(p = strrchr(argv[0], 'o')) || strcmp(p, "od"))
59 		newsyntax(argc, &argv);
60 	else
61 		oldsyntax(argc, &argv);
62 
63 	/* figure out the data block size */
64 	for (blocksize = 0, tfs = fshead; tfs; tfs = tfs->nextfs) {
65 		tfs->bcnt = size(tfs);
66 		if (blocksize < tfs->bcnt)
67 			blocksize = tfs->bcnt;
68 	}
69 	if (length != -1) {
70 		iobufsiz = MINIMUM(length, blocksize);
71 		if ((iobuf = malloc(iobufsiz)) == NULL)
72 			err(1, NULL);
73 	}
74 	/* rewrite the rules, do syntax checking */
75 	for (tfs = fshead; tfs; tfs = tfs->nextfs)
76 		rewrite(tfs);
77 
78 	(void)next(argv);
79 	display();
80 	exit(exitval);
81 }
82