| 1 | /* $NetBSD: special.c,v 1.12 2007/08/21 14:09:54 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[] = "@(#)special.c 8.3 (Berkeley) 4/2/94";
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| 36 | #else
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| 37 | __RCSID("$NetBSD: special.c,v 1.12 2007/08/21 14:09:54 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/types.h>
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| 42 |
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| 43 | #include <err.h>
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| 44 | #include <stdlib.h>
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| 45 | #include <stdio.h>
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| 46 | #include <string.h>
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| 47 |
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| 48 | #include "extern.h"
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| 49 |
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| 50 | void
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| 51 | c_special(int fd1, char *file1, off_t skip1, int fd2, char *file2, off_t skip2)
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| 52 | {
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| 53 | int ch1, ch2;
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| 54 | off_t byte, line;
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| 55 | FILE *fp1, *fp2;
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| 56 | int dfound;
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| 57 |
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| 58 | dfound = 0;
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| 59 | if ((fp1 = fdopen(fd1, "r")) == NULL)
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| 60 | err(ERR_EXIT, "%s", file1);
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| 61 | if ((fp2 = fdopen(fd2, "r")) == NULL)
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| 62 | err(ERR_EXIT, "%s", file2);
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| 63 |
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| 64 | for (byte = line = 1; skip1--; byte++) {
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| 65 | ch1 = getc(fp1);
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| 66 | if (ch1 == EOF)
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| 67 | goto eof;
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| 68 | if (ch1 == '\n')
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| 69 | line++;
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| 70 | }
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| 71 | for (byte = line = 1; skip2--; byte++) {
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| 72 | ch2 = getc(fp2);
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| 73 | if (ch2 == EOF)
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| 74 | goto eof;
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| 75 | if (ch2 == '\n')
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| 76 | line++;
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| 77 | }
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| 78 | dfound = 0;
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| 79 | for (byte = line = 1;; ++byte) {
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| 80 | ch1 = getc(fp1);
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| 81 | ch2 = getc(fp2);
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| 82 | if (ch1 == EOF || ch2 == EOF)
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| 83 | break;
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| 84 | if (ch1 != ch2) {
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| 85 | if (lflag) {
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| 86 | dfound = 1;
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| 87 | (void)printf("%6lld %3o %3o\n", (long long)byte,
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| 88 | ch1, ch2);
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| 89 | } else
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| 90 | diffmsg(file1, file2, byte, line);
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| 91 | /* NOTREACHED */
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| 92 | }
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| 93 | if (ch1 == '\n')
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| 94 | ++line;
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| 95 | }
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| 96 |
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| 97 | eof:
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| 98 | if (ferror(fp1))
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| 99 | errmsg(file1, byte, line);
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| 100 | if (ferror(fp2))
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| 101 | errmsg(file2, byte, line);
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| 102 | if (feof(fp1)) {
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| 103 | if (!feof(fp2))
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| 104 | eofmsg(file1, byte, line);
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| 105 | } else
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| 106 | if (feof(fp2))
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| 107 | eofmsg(file2, byte, line);
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| 108 | (void)fclose(fp1);
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| 109 | (void)fclose(fp2);
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| 110 | if (dfound)
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| 111 | exit(DIFF_EXIT);
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| 112 | }
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