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/* $OpenBSD: regular.c,v 1.12 2015/02/06 23:21:59 millert Exp $ */
/* $NetBSD: regular.c,v 1.2 1995/09/08 03:22:59 tls Exp $ */
/*-
* Copyright (c) 1991, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/mman.h>
#include <sys/stat.h>
#include <err.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "extern.h"
#define MINIMUM(a, b) (((a) < (b)) ? (a) : (b))
void
c_regular(int fd1, char *file1, off_t skip1, off_t len1,
int fd2, char *file2, off_t skip2, off_t len2)
{
u_char ch, *p1, *p2;
off_t byte, length, line;
int dfound;
if (sflag && len1 != len2)
exit(1);
if (skip1 > len1)
eofmsg(file1);
len1 -= skip1;
if (skip2 > len2)
eofmsg(file2);
len2 -= skip2;
length = MINIMUM(len1, len2);
if (length > SIZE_MAX) {
mmap_failed:
c_special(fd1, file1, skip1, fd2, file2, skip2);
return;
}
if ((p1 = mmap(NULL, (size_t)length, PROT_READ,
MAP_PRIVATE, fd1, skip1)) == MAP_FAILED)
goto mmap_failed;
if ((p2 = mmap(NULL, (size_t)length, PROT_READ,
MAP_PRIVATE, fd2, skip2)) == MAP_FAILED) {
munmap(p1, (size_t)length);
goto mmap_failed;
}
if (length) {
madvise(p1, length, MADV_SEQUENTIAL);
madvise(p2, length, MADV_SEQUENTIAL);
}
dfound = 0;
for (byte = line = 1; length--; ++p1, ++p2, ++byte) {
if ((ch = *p1) != *p2) {
if (lflag) {
dfound = 1;
(void)printf("%6lld %3o %3o\n", (long long)byte,
ch, *p2);
} else
diffmsg(file1, file2, byte, line);
/* NOTREACHED */
}
if (ch == '\n')
++line;
}
if (len1 != len2)
eofmsg (len1 > len2 ? file2 : file1);
if (dfound)
exit(DIFF_EXIT);
}
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