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31 * $FreeBSD: head/usr.bin/cmp/regular.c 223376 2011-06-21 20:44:06Z delphij $
33 * @(#)regular.c 8.3 (Berkeley) 4/2/94
36 #include <sys/param.h>
49 static u_char *remmap(u_char *, int, off_t);
50 static void segv_handler(int);
51 #define MMAP_CHUNK (8*1024*1024)
53 #define ROUNDPAGE(i) ((i) & ~pagemask)
56 c_regular(int fd1, const char *file1, off_t skip1, off_t len1,
57 int fd2, const char *file2, off_t skip2, off_t len2)
59 struct sigaction act, oact;
60 u_char ch, *p1, *p2, *m1, *m2, *e1, *e2;
61 off_t byte, length, line;
62 off_t pagemask, off1, off2;
73 if (sflag && len1 != len2)
76 pagesize = getpagesize();
77 pagemask = (off_t)pagesize - 1;
78 off1 = ROUNDPAGE(skip1);
79 off2 = ROUNDPAGE(skip2);
81 length = MIN(len1, len2);
83 if ((m1 = remmap(NULL, fd1, off1)) == NULL) {
84 c_special(fd1, file1, skip1, fd2, file2, skip2);
88 if ((m2 = remmap(NULL, fd2, off2)) == NULL) {
89 munmap(m1, MMAP_CHUNK);
90 c_special(fd1, file1, skip1, fd2, file2, skip2);
94 sigemptyset(&act.sa_mask);
95 act.sa_flags = SA_NODEFER;
96 act.sa_handler = segv_handler;
97 if (sigaction(SIGSEGV, &act, &oact))
98 err(ERR_EXIT, "sigaction()");
101 e1 = m1 + MMAP_CHUNK;
102 e2 = m2 + MMAP_CHUNK;
103 p1 = m1 + (skip1 - off1);
104 p2 = m2 + (skip2 - off2);
106 for (byte = line = 1; length--; ++byte) {
107 if ((ch = *p1) != *p2) {
110 printf("%08jx %02x %02x\n",
111 (intmax_t)byte - 1, ch, *p2);
114 printf("%6jd %3o %3o\n",
115 (intmax_t)byte, ch, *p2);
117 diffmsg(file1, file2, byte, line);
124 if ((p1 = m1 = remmap(m1, fd1, off1)) == NULL) {
125 munmap(m2, MMAP_CHUNK);
126 err(ERR_EXIT, "remmap %s", file1);
128 e1 = m1 + MMAP_CHUNK;
132 if ((p2 = m2 = remmap(m2, fd2, off2)) == NULL) {
133 munmap(m1, MMAP_CHUNK);
134 err(ERR_EXIT, "remmap %s", file2);
136 e2 = m2 + MMAP_CHUNK;
139 munmap(m1, MMAP_CHUNK);
140 munmap(m2, MMAP_CHUNK);
142 if (sigaction(SIGSEGV, &oact, NULL))
143 err(ERR_EXIT, "sigaction()");
146 eofmsg (len1 > len2 ? file2 : file1);
152 remmap(u_char *mem, int fd, off_t offset)
155 munmap(mem, MMAP_CHUNK);
156 mem = mmap(NULL, MMAP_CHUNK, PROT_READ, MAP_SHARED, fd, offset);
157 if (mem == MAP_FAILED)
159 madvise(mem, MMAP_CHUNK, MADV_SEQUENTIAL);
164 segv_handler(int sig __unused) {
165 static const char msg[] = "cmp: Input/output error (caught SIGSEGV)\n";
167 write(STDERR_FILENO, msg, sizeof(msg));