1 /*-
2 * Copyright (c) 1991, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 *
5 * %sccs.include.redist.c%
6 */
7
8 #ifndef lint
9 static char sccsid[] = "@(#)special.c 8.3 (Berkeley) 04/02/94";
10 #endif /* not lint */
11
12 #include <sys/types.h>
13
14 #include <err.h>
15 #include <stdlib.h>
16 #include <stdio.h>
17 #include <string.h>
18
19 #include "extern.h"
20
21 void
c_special(fd1,file1,skip1,fd2,file2,skip2)22 c_special(fd1, file1, skip1, fd2, file2, skip2)
23 int fd1, fd2;
24 char *file1, *file2;
25 off_t skip1, skip2;
26 {
27 int ch1, ch2;
28 off_t byte, line;
29 FILE *fp1, *fp2;
30 int dfound;
31
32 if ((fp1 = fdopen(fd1, "r")) == NULL)
33 err(ERR_EXIT, "%s", file1);
34 if ((fp2 = fdopen(fd2, "r")) == NULL)
35 err(ERR_EXIT, "%s", file2);
36
37 while (skip1--)
38 if (getc(fp1) == EOF)
39 goto eof;
40 while (skip2--)
41 if (getc(fp2) == EOF)
42 goto eof;
43
44 dfound = 0;
45 for (byte = line = 1;; ++byte) {
46 ch1 = getc(fp1);
47 ch2 = getc(fp2);
48 if (ch1 == EOF || ch2 == EOF)
49 break;
50 if (ch1 != ch2)
51 if (lflag) {
52 dfound = 1;
53 (void)printf("%6qd %3o %3o\n", byte, ch1, ch2);
54 } else
55 diffmsg(file1, file2, byte, line);
56 /* NOTREACHED */
57 if (ch1 == '\n')
58 ++line;
59 }
60
61 eof: if (ferror(fp1))
62 err(ERR_EXIT, "%s", file1);
63 if (ferror(fp2))
64 err(ERR_EXIT, "%s", file2);
65 if (feof(fp1)) {
66 if (!feof(fp2))
67 eofmsg(file1);
68 } else
69 if (feof(fp2))
70 eofmsg(file2);
71 if (dfound)
72 exit(DIFF_EXIT);
73 }
74