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