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/* $OpenBSD: regular.c,v 1.12 2015/02/06 23:21:59 millert Exp $ */ |
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/* $NetBSD: regular.c,v 1.2 1995/09/08 03:22:59 tls 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/mman.h> |
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#include <sys/stat.h> |
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#include <err.h> |
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#include <stdint.h> |
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#include <stdlib.h> |
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#include <stdio.h> |
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#include <string.h> |
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#include "extern.h" |
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#define MINIMUM(a, b) (((a) < (b)) ? (a) : (b)) |
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void |
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c_regular(int fd1, char *file1, off_t skip1, off_t len1, |
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int fd2, 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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✓✓✗✓
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if (sflag && len1 != len2) |
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exit(1); |
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✗✓ |
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if (skip1 > len1) |
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eofmsg(file1); |
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len1 -= skip1; |
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✗✓ |
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if (skip2 > len2) |
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eofmsg(file2); |
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len2 -= skip2; |
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length = MINIMUM(len1, len2); |
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✗✓ |
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if (length > SIZE_MAX) { |
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mmap_failed: |
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c_special(fd1, file1, skip1, fd2, file2, skip2); |
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return; |
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} |
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✓✓ |
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if ((p1 = mmap(NULL, (size_t)length, PROT_READ, |
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MAP_PRIVATE, fd1, skip1)) == MAP_FAILED) |
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goto mmap_failed; |
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✗✓ |
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if ((p2 = mmap(NULL, (size_t)length, PROT_READ, |
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MAP_PRIVATE, fd2, skip2)) == MAP_FAILED) { |
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munmap(p1, (size_t)length); |
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goto mmap_failed; |
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} |
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✓✗ |
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if (length) { |
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madvise(p1, length, MADV_SEQUENTIAL); |
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madvise(p2, length, MADV_SEQUENTIAL); |
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} |
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dfound = 0; |
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✓✓ |
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for (byte = line = 1; length--; ++p1, ++p2, ++byte) { |
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✓✓ |
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if ((ch = *p1) != *p2) { |
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✗✓ |
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if (lflag) { |
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dfound = 1; |
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(void)printf("%6lld %3o %3o\n", (long long)byte, |
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ch, *p2); |
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} else |
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diffmsg(file1, file2, byte, line); |
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/* NOTREACHED */ |
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} |
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✓✓ |
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if (ch == '\n') |
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++line; |
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} |
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✗✓ |
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if (len1 != len2) |
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eofmsg (len1 > len2 ? file2 : file1); |
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✗✓ |
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if (dfound) |
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exit(DIFF_EXIT); |
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} |