118 lines
3.4 KiB
C
118 lines
3.4 KiB
C
/* $NetBSD: regular.c,v 1.24 2013/11/20 17:19:14 kleink Exp $ */
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/*-
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* Copyright (c) 1991, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)regular.c 8.3 (Berkeley) 4/2/94";
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#else
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__RCSID("$NetBSD: regular.c,v 1.24 2013/11/20 17:19:14 kleink Exp $");
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#endif
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <err.h>
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#include <limits.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <stdio.h>
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#include "extern.h"
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void
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c_regular(int fd1, const char *file1, off_t skip1, off_t len1,
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int fd2, const char *file2, off_t skip2, off_t len2)
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{
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u_char ch, *p1, *p2;
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off_t byte, length, line;
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int dfound;
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size_t blk_sz, blk_cnt;
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if (sflag && len1 != len2)
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exit(1);
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if (skip1 > len1)
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eofmsg(file1, len1 + 1, 0);
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len1 -= skip1;
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if (skip2 > len2)
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eofmsg(file2, len2 + 1, 0);
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len2 -= skip2;
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byte = line = 1;
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dfound = 0;
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length = MIN(len1, len2);
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for (blk_sz = 1024 * 1024; length != 0; length -= blk_sz) {
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if ((uintmax_t)blk_sz > (uintmax_t)length)
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blk_sz = length;
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p1 = mmap(NULL, blk_sz, PROT_READ, MAP_FILE|MAP_SHARED,
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fd1, skip1);
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if (p1 == MAP_FAILED)
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goto mmap_failed;
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p2 = mmap(NULL, blk_sz, PROT_READ, MAP_FILE|MAP_SHARED,
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fd2, skip2);
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if (p2 == MAP_FAILED) {
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munmap(p1, blk_sz);
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goto mmap_failed;
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}
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blk_cnt = blk_sz;
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for (; blk_cnt--; ++p1, ++p2, ++byte) {
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if ((ch = *p1) != *p2) {
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if (!lflag) {
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diffmsg(file1, file2, byte, line);
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/* NOTREACHED */
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}
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dfound = 1;
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(void)printf("%6lld %3o %3o\n",
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(long long)byte, ch, *p2);
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}
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if (ch == '\n')
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++line;
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}
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munmap(p1 - blk_sz, blk_sz);
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munmap(p2 - blk_sz, blk_sz);
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skip1 += blk_sz;
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skip2 += blk_sz;
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}
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if (len1 != len2)
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eofmsg(len1 > len2 ? file2 : file1, byte, line);
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if (dfound)
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exit(DIFF_EXIT);
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return;
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mmap_failed:
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c_special(fd1, file1, skip1, fd2, file2, skip2);
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}
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