151413Sbostic /*-
2*66652Spendry * Copyright (c) 1991, 1993, 1994
361944Sbostic * The Regents of the University of California. All rights reserved.
451413Sbostic *
551413Sbostic * %sccs.include.redist.c%
651413Sbostic */
751413Sbostic
851413Sbostic #ifndef lint
9*66652Spendry static char sccsid[] = "@(#)regular.c 8.3 (Berkeley) 04/02/94";
1051413Sbostic #endif /* not lint */
1151413Sbostic
1251413Sbostic #include <sys/param.h>
1351413Sbostic #include <sys/mman.h>
1451413Sbostic #include <sys/stat.h>
1554364Sbostic
1666589Spendry #include <err.h>
1754364Sbostic #include <limits.h>
1851413Sbostic #include <stdlib.h>
1951413Sbostic #include <stdio.h>
2051413Sbostic #include <string.h>
2166589Spendry
2251413Sbostic #include "extern.h"
2351413Sbostic
2451413Sbostic void
c_regular(fd1,file1,skip1,len1,fd2,file2,skip2,len2)2551413Sbostic c_regular(fd1, file1, skip1, len1, fd2, file2, skip2, len2)
2651413Sbostic int fd1, fd2;
2751413Sbostic char *file1, *file2;
2851413Sbostic off_t skip1, len1, skip2, len2;
2951413Sbostic {
3066589Spendry u_char ch, *p1, *p2;
3166589Spendry off_t byte, length, line;
3251413Sbostic int dfound;
3351413Sbostic
3451413Sbostic if (sflag && len1 != len2)
3551413Sbostic exit(1);
3651413Sbostic
3751733Sbostic if (skip1 > len1)
3851413Sbostic eofmsg(file1);
3951413Sbostic len1 -= skip1;
4051733Sbostic if (skip2 > len2)
4151413Sbostic eofmsg(file2);
4251413Sbostic len2 -= skip2;
4351413Sbostic
4451413Sbostic length = MIN(len1, len2);
4554364Sbostic if (length > SIZE_T_MAX)
4654364Sbostic return (c_special(fd1, file1, skip1, fd2, file2, skip2));
4754364Sbostic
4851413Sbostic if ((p1 = (u_char *)mmap(NULL,
4954364Sbostic (size_t)length, PROT_READ, 0, fd1, skip1)) == (u_char *)-1)
5066589Spendry err(ERR_EXIT, "%s", file1);
5151413Sbostic if ((p2 = (u_char *)mmap(NULL,
5254364Sbostic (size_t)length, PROT_READ, 0, fd2, skip2)) == (u_char *)-1)
5366589Spendry err(ERR_EXIT, "%s", file2);
5451413Sbostic
5551413Sbostic dfound = 0;
5651413Sbostic for (byte = line = 1; length--; ++p1, ++p2, ++byte) {
5751413Sbostic if ((ch = *p1) != *p2)
5851413Sbostic if (lflag) {
5951413Sbostic dfound = 1;
6054187Sbostic (void)printf("%6qd %3o %3o\n", byte, ch, *p2);
6151413Sbostic } else
6251413Sbostic diffmsg(file1, file2, byte, line);
6351413Sbostic /* NOTREACHED */
6451413Sbostic if (ch == '\n')
6551413Sbostic ++line;
6651413Sbostic }
6751413Sbostic
6851413Sbostic if (len1 != len2)
6951413Sbostic eofmsg (len1 > len2 ? file2 : file1);
7051413Sbostic if (dfound)
7166589Spendry exit(DIFF_EXIT);
7251413Sbostic }
73