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
32 #include <sys/types.h>
33
34 #include <capsicum_helpers.h>
35 #include <err.h>
36 #include <stdbool.h>
37 #include <stdlib.h>
38 #include <stdio.h>
39
40 #include "extern.h"
41
42 int
c_special(int fd1,const char * file1,off_t skip1,int fd2,const char * file2,off_t skip2,off_t limit)43 c_special(int fd1, const char *file1, off_t skip1,
44 int fd2, const char *file2, off_t skip2, off_t limit)
45 {
46 int ch1, ch2;
47 off_t byte, line;
48 FILE *fp1, *fp2;
49 int dfound;
50
51 if (caph_limit_stream(fd1, CAPH_READ) < 0)
52 err(ERR_EXIT, "caph_limit_stream(%s)", file1);
53 if (caph_limit_stream(fd2, CAPH_READ) < 0)
54 err(ERR_EXIT, "caph_limit_stream(%s)", file2);
55 if (caph_enter() < 0)
56 err(ERR_EXIT, "unable to enter capability mode");
57
58 if ((fp1 = fdopen(fd1, "r")) == NULL)
59 err(ERR_EXIT, "%s", file1);
60 (void)setvbuf(fp1, NULL, _IOFBF, 65536);
61 if ((fp2 = fdopen(fd2, "r")) == NULL)
62 err(ERR_EXIT, "%s", file2);
63 (void)setvbuf(fp2, NULL, _IOFBF, 65536);
64
65 dfound = 0;
66 while (skip1--)
67 if (getc(fp1) == EOF)
68 goto eof;
69 while (skip2--)
70 if (getc(fp2) == EOF)
71 goto eof;
72
73 for (byte = line = 1; limit == 0 || byte <= limit; ++byte) {
74 #ifdef SIGINFO
75 if (info) {
76 (void)fprintf(stderr, "%s %s char %zu line %zu\n",
77 file1, file2, (size_t)byte, (size_t)line);
78 info = 0;
79 }
80 #endif
81 ch1 = getc(fp1);
82 ch2 = getc(fp2);
83 if (ch1 == EOF || ch2 == EOF)
84 break;
85 if (ch1 != ch2) {
86 if (xflag) {
87 dfound = 1;
88 (void)printf("%08llx %02x %02x\n",
89 (long long)byte - 1, ch1, ch2);
90 } else if (lflag) {
91 dfound = 1;
92 if (bflag)
93 (void)printf("%6lld %3o %c %3o %c\n",
94 (long long)byte, ch1, ch1, ch2,
95 ch2);
96 else
97 (void)printf("%6lld %3o %3o\n",
98 (long long)byte, ch1, ch2);
99 } else {
100 diffmsg(file1, file2, byte, line, ch1, ch2);
101 return (DIFF_EXIT);
102 }
103 }
104 if (ch1 == '\n')
105 ++line;
106 }
107
108 eof: if (ferror(fp1))
109 err(ERR_EXIT, "%s", file1);
110 if (ferror(fp2))
111 err(ERR_EXIT, "%s", file2);
112 if (feof(fp1)) {
113 if (!feof(fp2)) {
114 eofmsg(file1);
115 return (DIFF_EXIT);
116 }
117 } else {
118 if (feof(fp2)) {
119 eofmsg(file2);
120 return (DIFF_EXIT);
121 }
122 }
123 fclose(fp2);
124 fclose(fp1);
125 return (dfound ? DIFF_EXIT : 0);
126 }
127