2 * Copyright (c) 1991, 1993, 1994
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6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
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29 * $FreeBSD: head/usr.bin/cmp/regular.c 223376 2011-06-21 20:44:06Z delphij $
31 * @(#)regular.c 8.3 (Berkeley) 4/2/94
34 #include <sys/param.h>
48 static u_char
*remmap(u_char
*, int, off_t
);
49 static void segv_handler(int);
50 #define MMAP_CHUNK (8*1024*1024)
52 #define ROUNDPAGE(i) ((i) & ~pagemask)
55 c_regular(int fd1
, const char *file1
, off_t skip1
, off_t len1
,
56 int fd2
, const char *file2
, off_t skip2
, off_t len2
)
58 u_char ch
, *p1
, *p2
, *m1
, *m2
, *e1
, *e2
;
59 off_t byte
, length
, line
;
61 off_t pagemask
, off1
, off2
;
63 struct sigaction act
, oact
;
72 if (sflag
&& len1
!= len2
)
75 sigemptyset(&act
.sa_mask
);
76 act
.sa_flags
= SA_NODEFER
;
77 act
.sa_handler
= segv_handler
;
78 if (sigaction(SIGSEGV
, &act
, &oact
))
79 err(ERR_EXIT
, "sigaction()");
81 pagesize
= getpagesize();
82 pagemask
= (off_t
)pagesize
- 1;
83 off1
= ROUNDPAGE(skip1
);
84 off2
= ROUNDPAGE(skip2
);
86 length
= MIN(len1
, len2
);
88 if ((m1
= remmap(NULL
, fd1
, off1
)) == NULL
) {
89 c_special(fd1
, file1
, skip1
, fd2
, file2
, skip2
);
93 if ((m2
= remmap(NULL
, fd2
, off2
)) == NULL
) {
94 munmap(m1
, MMAP_CHUNK
);
95 c_special(fd1
, file1
, skip1
, fd2
, file2
, skip2
);
100 e1
= m1
+ MMAP_CHUNK
;
101 e2
= m2
+ MMAP_CHUNK
;
102 p1
= m1
+ (skip1
- off1
);
103 p2
= m2
+ (skip2
- off2
);
105 for (byte
= line
= 1; length
--; ++byte
) {
106 if ((ch
= *p1
) != *p2
) {
109 printf("%08jx %02x %02x\n",
110 (intmax_t)byte
- 1, ch
, *p2
);
113 printf("%6jd %3o %3o\n",
114 (intmax_t)byte
, ch
, *p2
);
116 diffmsg(file1
, file2
, byte
, line
);
123 if ((p1
= m1
= remmap(m1
, fd1
, off1
)) == NULL
) {
124 munmap(m2
, MMAP_CHUNK
);
125 err(ERR_EXIT
, "remmap %s", file1
);
127 e1
= m1
+ MMAP_CHUNK
;
131 if ((p2
= m2
= remmap(m2
, fd2
, off2
)) == NULL
) {
132 munmap(m1
, MMAP_CHUNK
);
133 err(ERR_EXIT
, "remmap %s", file2
);
135 e2
= m2
+ MMAP_CHUNK
;
138 munmap(m1
, MMAP_CHUNK
);
139 munmap(m2
, MMAP_CHUNK
);
141 if (sigaction(SIGSEGV
, &oact
, NULL
))
142 err(ERR_EXIT
, "sigaction()");
145 eofmsg (len1
> len2
? file2
: file1
);
151 remmap(u_char
*mem
, int fd
, off_t offset
)
154 munmap(mem
, MMAP_CHUNK
);
155 mem
= mmap(NULL
, MMAP_CHUNK
, PROT_READ
, MAP_SHARED
, fd
, offset
);
156 if (mem
== MAP_FAILED
)
158 madvise(mem
, MMAP_CHUNK
, MADV_SEQUENTIAL
);
163 segv_handler(int sig __unused
) {
164 static const char msg
[] = "cmp: Input/output error (caught SIGSEGV)\n";
166 write(STDERR_FILENO
, msg
, sizeof(msg
));