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[] = "@(#)regular.c 8.3 (Berkeley) 04/02/94";
10 #endif /* not lint */
11
12 #include <sys/param.h>
13 #include <sys/mman.h>
14 #include <sys/stat.h>
15
16 #include <err.h>
17 #include <limits.h>
18 #include <stdlib.h>
19 #include <stdio.h>
20 #include <string.h>
21
22 #include "extern.h"
23
24 void
c_regular(fd1,file1,skip1,len1,fd2,file2,skip2,len2)25 c_regular(fd1, file1, skip1, len1, fd2, file2, skip2, len2)
26 int fd1, fd2;
27 char *file1, *file2;
28 off_t skip1, len1, skip2, len2;
29 {
30 u_char ch, *p1, *p2;
31 off_t byte, length, line;
32 int dfound;
33
34 if (sflag && len1 != len2)
35 exit(1);
36
37 if (skip1 > len1)
38 eofmsg(file1);
39 len1 -= skip1;
40 if (skip2 > len2)
41 eofmsg(file2);
42 len2 -= skip2;
43
44 length = MIN(len1, len2);
45 if (length > SIZE_T_MAX)
46 return (c_special(fd1, file1, skip1, fd2, file2, skip2));
47
48 if ((p1 = (u_char *)mmap(NULL,
49 (size_t)length, PROT_READ, 0, fd1, skip1)) == (u_char *)-1)
50 err(ERR_EXIT, "%s", file1);
51 if ((p2 = (u_char *)mmap(NULL,
52 (size_t)length, PROT_READ, 0, fd2, skip2)) == (u_char *)-1)
53 err(ERR_EXIT, "%s", file2);
54
55 dfound = 0;
56 for (byte = line = 1; length--; ++p1, ++p2, ++byte) {
57 if ((ch = *p1) != *p2)
58 if (lflag) {
59 dfound = 1;
60 (void)printf("%6qd %3o %3o\n", byte, ch, *p2);
61 } else
62 diffmsg(file1, file2, byte, line);
63 /* NOTREACHED */
64 if (ch == '\n')
65 ++line;
66 }
67
68 if (len1 != len2)
69 eofmsg (len1 > len2 ? file2 : file1);
70 if (dfound)
71 exit(DIFF_EXIT);
72 }
73