diff options
Diffstat (limited to 'usr.bin/cmp/regular.c')
| -rw-r--r-- | usr.bin/cmp/regular.c | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/usr.bin/cmp/regular.c b/usr.bin/cmp/regular.c new file mode 100644 index 0000000..63c663f --- /dev/null +++ b/usr.bin/cmp/regular.c @@ -0,0 +1,118 @@ +/* $NetBSD: regular.c,v 1.24 2013/11/20 17:19:14 kleink 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/cdefs.h> +#ifndef lint +#if 0 +static char sccsid[] = "@(#)regular.c 8.3 (Berkeley) 4/2/94"; +#else +__RCSID("$NetBSD: regular.c,v 1.24 2013/11/20 17:19:14 kleink Exp $"); +#endif +#endif /* not lint */ + +#include <sys/param.h> +#include <sys/mman.h> +#include <sys/stat.h> + +#include <err.h> +#include <limits.h> +#include <stdlib.h> +#include <stdint.h> +#include <stdio.h> + +#include "extern.h" + +void +c_regular(int fd1, const char *file1, off_t skip1, off_t len1, + int fd2, const char *file2, off_t skip2, off_t len2) +{ + u_char ch, *p1, *p2; + off_t byte, length, line; + int dfound; + size_t blk_sz, blk_cnt; + + if (sflag && len1 != len2) + exit(1); + + if (skip1 > len1) + eofmsg(file1, len1 + 1, 0); + len1 -= skip1; + if (skip2 > len2) + eofmsg(file2, len2 + 1, 0); + len2 -= skip2; + + byte = line = 1; + dfound = 0; + length = MIN(len1, len2); + for (blk_sz = 1024 * 1024; length != 0; length -= blk_sz) { + if ((uintmax_t)blk_sz > (uintmax_t)length) + blk_sz = length; + p1 = mmap(NULL, blk_sz, PROT_READ, MAP_FILE|MAP_SHARED, + fd1, skip1); + if (p1 == MAP_FAILED) + goto mmap_failed; + + p2 = mmap(NULL, blk_sz, PROT_READ, MAP_FILE|MAP_SHARED, + fd2, skip2); + if (p2 == MAP_FAILED) { + munmap(p1, blk_sz); + goto mmap_failed; + } + + blk_cnt = blk_sz; + for (; blk_cnt--; ++p1, ++p2, ++byte) { + if ((ch = *p1) != *p2) { + if (!lflag) { + diffmsg(file1, file2, byte, line); + /* NOTREACHED */ + } + dfound = 1; + (void)printf("%6lld %3o %3o\n", + (long long)byte, ch, *p2); + } + if (ch == '\n') + ++line; + } + munmap(p1 - blk_sz, blk_sz); + munmap(p2 - blk_sz, blk_sz); + skip1 += blk_sz; + skip2 += blk_sz; + } + + if (len1 != len2) + eofmsg(len1 > len2 ? file2 : file1, byte, line); + if (dfound) + exit(DIFF_EXIT); + return; + +mmap_failed: + c_special(fd1, file1, skip1, fd2, file2, skip2); +} |