1 /* $OpenBSD: special.c,v 1.7 2011/01/19 13:01:25 okan Exp $ */ 2 /* $NetBSD: special.c,v 1.2 1995/09/08 03:23:00 tls Exp $ */ 3 4 /*- 5 * Copyright (c) 1991, 1993, 1994 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #include <sys/types.h> 34 35 #include <err.h> 36 #include <stdlib.h> 37 #include <stdio.h> 38 #include <string.h> 39 40 #include "extern.h" 41 42 void 43 c_special(int fd1, char *file1, off_t skip1, int fd2, char *file2, off_t skip2) 44 { 45 int ch1, ch2; 46 off_t byte, line; 47 FILE *fp1, *fp2; 48 int dfound; 49 50 if ((fp1 = fdopen(fd1, "r")) == NULL) 51 err(ERR_EXIT, "%s", file1); 52 if ((fp2 = fdopen(fd2, "r")) == NULL) 53 err(ERR_EXIT, "%s", file2); 54 55 dfound = 0; 56 while (skip1--) 57 if (getc(fp1) == EOF) 58 goto eof; 59 while (skip2--) 60 if (getc(fp2) == EOF) 61 goto eof; 62 63 for (byte = line = 1;; ++byte) { 64 ch1 = getc(fp1); 65 ch2 = getc(fp2); 66 if (ch1 == EOF || ch2 == EOF) 67 break; 68 if (ch1 != ch2) { 69 if (lflag) { 70 dfound = 1; 71 (void)printf("%6lld %3o %3o\n", (long long)byte, 72 ch1, ch2); 73 } else 74 diffmsg(file1, file2, byte, line); 75 /* NOTREACHED */ 76 } 77 if (ch1 == '\n') 78 ++line; 79 } 80 81 eof: if (ferror(fp1)) 82 err(ERR_EXIT, "%s", file1); 83 if (ferror(fp2)) 84 err(ERR_EXIT, "%s", file2); 85 if (feof(fp1)) { 86 if (!feof(fp2)) 87 eofmsg(file1); 88 } else 89 if (feof(fp2)) 90 eofmsg(file2); 91 if (dfound) 92 exit(DIFF_EXIT); 93 } 94