1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1991, 1993, 1994
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 * $FreeBSD: head/usr.bin/cmp/special.c 223376 2011-06-21 20:44:06Z delphij $
32 *
33 * @(#)special.c 8.3 (Berkeley) 4/2/94
34 */
35
36 #include <sys/types.h>
37
38 #include <err.h>
39 #include <stdlib.h>
40 #include <stdio.h>
41
42 #include "extern.h"
43
44 void
c_special(int fd1,const char * file1,off_t skip1,int fd2,const char * file2,off_t skip2)45 c_special(int fd1, const char *file1, off_t skip1,
46 int fd2, const char *file2, off_t skip2)
47 {
48 int ch1, ch2;
49 off_t byte, line;
50 FILE *fp1, *fp2;
51 int dfound;
52
53 if ((fp1 = fdopen(fd1, "r")) == NULL)
54 err(ERR_EXIT, "%s", file1);
55 if ((fp2 = fdopen(fd2, "r")) == NULL)
56 err(ERR_EXIT, "%s", file2);
57
58 dfound = 0;
59 while (skip1--)
60 if (getc(fp1) == EOF)
61 goto eof;
62 while (skip2--)
63 if (getc(fp2) == EOF)
64 goto eof;
65
66 for (byte = line = 1;; ++byte) {
67 ch1 = getc(fp1);
68 ch2 = getc(fp2);
69 if (ch1 == EOF || ch2 == EOF)
70 break;
71 if (ch1 != ch2) {
72 if (xflag) {
73 dfound = 1;
74 printf("%08jx %02x %02x\n",
75 (intmax_t)byte - 1, ch1, ch2);
76 } else if (lflag) {
77 dfound = 1;
78 printf("%6jd %3o %3o\n",
79 (intmax_t)byte, ch1, ch2);
80 } else {
81 diffmsg(file1, file2, byte, line);
82 /* NOTREACHED */
83 }
84 }
85 if (ch1 == '\n')
86 ++line;
87 }
88
89 eof: if (ferror(fp1))
90 err(ERR_EXIT, "%s", file1);
91 if (ferror(fp2))
92 err(ERR_EXIT, "%s", file2);
93 if (feof(fp1)) {
94 if (!feof(fp2))
95 eofmsg(file1);
96 } else
97 if (feof(fp2))
98 eofmsg(file2);
99 fclose(fp2);
100 fclose(fp1);
101 if (dfound)
102 exit(DIFF_EXIT);
103 }
104