| 1 | /* $NetBSD: regular.c,v 1.20 2006/06/03 21:47:55 christos Exp $ */
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| 2 |
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| 3 | /*-
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| 4 | * Copyright (c) 1991, 1993, 1994
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| 5 | * The Regents of the University of California. All rights reserved.
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| 6 | *
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| 7 | * Redistribution and use in source and binary forms, with or without
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| 8 | * modification, are permitted provided that the following conditions
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| 9 | * are met:
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| 10 | * 1. Redistributions of source code must retain the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer.
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| 12 | * 2. Redistributions in binary form must reproduce the above copyright
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| 13 | * notice, this list of conditions and the following disclaimer in the
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| 14 | * documentation and/or other materials provided with the distribution.
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| 15 | * 3. Neither the name of the University nor the names of its contributors
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| 16 | * may be used to endorse or promote products derived from this software
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| 17 | * without specific prior written permission.
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| 18 | *
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| 19 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 20 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 23 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 24 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 25 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 26 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 27 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 28 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 29 | * SUCH DAMAGE.
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| 30 | */
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| 31 |
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| 32 | /*#include <sys/cdefs.h>*/
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| 33 | #ifndef lint
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| 34 | /*#if 0
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| 35 | static char sccsid[] = "@(#)regular.c 8.3 (Berkeley) 4/2/94";
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| 36 | #else
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| 37 | __RCSID("$NetBSD: regular.c,v 1.20 2006/06/03 21:47:55 christos Exp $");
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| 38 | #endif*/
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| 39 | #endif /* not lint */
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| 40 |
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| 41 | #include <sys/stat.h>
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| 42 |
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| 43 | #include "err.h"
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| 44 | #include <limits.h>
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| 45 | #include <stdlib.h>
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| 46 | #include <stdio.h>
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| 47 | #include <string.h>
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| 48 |
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| 49 | #include "cmp_extern.h"
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| 50 |
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| 51 | static int
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| 52 | c_regular(int fd1, char *file1, off_t skip1, off_t len1,
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| 53 | int fd2, char *file2, off_t skip2, off_t len2)
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| 54 | {
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| 55 | unsigned char ch, *p1, *p2, *b1 = 0, *b2 = 0;
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| 56 | off_t byte, length, line, bytes_read;
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| 57 | int dfound;
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| 58 | size_t blk_sz, blk_cnt;
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| 59 |
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| 60 | if (sflag && len1 != len2)
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| 61 | return(1);
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| 62 |
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| 63 | if (skip1 > len1)
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| 64 | return eofmsg(file1, len1 + 1, 0);
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| 65 | len1 -= skip1;
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| 66 | if (skip2 > len2)
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| 67 | return eofmsg(file2, len2 + 1, 0);
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| 68 | len2 -= skip2;
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| 69 |
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| 70 | if (skip1 && lseek(fd1, skip1, SEEK_SET) < 0)
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| 71 | goto l_special;
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| 72 | if (skip2 && lseek(fd2, skip2, SEEK_SET) < 0) {
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| 73 | if (skip1 && lseek(fd1, 0, SEEK_SET) < 0)
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| 74 | return err(1, "seek failed");
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| 75 | goto l_special;
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| 76 | }
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| 77 |
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| 78 | #define CMP_BUF_SIZE (128*1024)
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| 79 |
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| 80 | b1 = malloc(CMP_BUF_SIZE);
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| 81 | b2 = malloc(CMP_BUF_SIZE);
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| 82 | if (!b1 || !b2)
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| 83 | goto l_malloc_failed;
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| 84 |
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| 85 | byte = line = 1;
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| 86 | dfound = 0;
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| 87 | length = len1;
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| 88 | if (length > len2)
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| 89 | length = len2;
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| 90 | for (blk_sz = CMP_BUF_SIZE; length != 0; length -= blk_sz) {
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| 91 | if ((off_t)blk_sz > length)
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| 92 | blk_sz = length;
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| 93 |
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| 94 | bytes_read = read(fd1, b1, blk_sz);
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| 95 | if (bytes_read != blk_sz)
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| 96 | goto l_read_error;
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| 97 |
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| 98 | bytes_read = read(fd2, b2, blk_sz);
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| 99 | if (bytes_read != blk_sz)
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| 100 | goto l_read_error;
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| 101 |
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| 102 | blk_cnt = blk_sz;
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| 103 | p1 = b1;
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| 104 | p2 = b2;
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| 105 | for (; blk_cnt--; ++p1, ++p2, ++byte) {
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| 106 | if ((ch = *p1) != *p2) {
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| 107 | if (!lflag) {
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| 108 | free(b1);
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| 109 | free(b2);
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| 110 | return diffmsg(file1, file2, byte, line);
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| 111 | }
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| 112 | dfound = 1;
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| 113 | (void)printf("%6lld %3o %3o\n",
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| 114 | (long long)byte, ch, *p2);
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| 115 | }
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| 116 | if (ch == '\n')
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| 117 | ++line;
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| 118 | }
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| 119 | skip1 += blk_sz;
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| 120 | skip2 += blk_sz;
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| 121 | }
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| 122 |
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| 123 | if (len1 != len2)
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| 124 | return eofmsg(len1 > len2 ? file2 : file1, byte, line);
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| 125 | if (dfound)
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| 126 | return(DIFF_EXIT);
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| 127 | return(0);
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| 128 |
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| 129 | l_read_error:
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| 130 | if ( lseek(fd1, 0, SEEK_SET) < 0
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| 131 | || lseek(fd2, 0, SEEK_SET) < 0) {
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| 132 | err(1, "seek failed");
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| 133 | free(b1);
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| 134 | free(b2);
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| 135 | return 1;
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| 136 | }
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| 137 | l_malloc_failed:
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| 138 | free(b1);
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| 139 | free(b2);
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| 140 | l_special:
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| 141 | return c_special(fd1, file1, skip1, fd2, file2, skip2);
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| 142 | }
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| 143 |
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