1 /*- 2 * Copyright (c) 1991, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #if 0 35 #ifndef lint 36 static char sccsid[] = "@(#)special.c 8.3 (Berkeley) 4/2/94"; 37 #endif 38 #endif 39 40 #include <sys/cdefs.h> 41 __FBSDID("$FreeBSD$"); 42 43 #include <sys/types.h> 44 45 #include <err.h> 46 #include <stdlib.h> 47 #include <stdio.h> 48 #include <string.h> 49 50 #include "extern.h" 51 52 void 53 c_special(int fd1, const char *file1, off_t skip1, 54 int fd2, const char *file2, off_t skip2) 55 { 56 int ch1, ch2; 57 off_t byte, line; 58 FILE *fp1, *fp2; 59 int dfound; 60 61 if ((fp1 = fdopen(fd1, "r")) == NULL) 62 err(ERR_EXIT, "%s", file1); 63 if ((fp2 = fdopen(fd2, "r")) == NULL) 64 err(ERR_EXIT, "%s", file2); 65 66 dfound = 0; 67 while (skip1--) 68 if (getc(fp1) == EOF) 69 goto eof; 70 while (skip2--) 71 if (getc(fp2) == EOF) 72 goto eof; 73 74 for (byte = line = 1;; ++byte) { 75 ch1 = getc(fp1); 76 ch2 = getc(fp2); 77 if (ch1 == EOF || ch2 == EOF) 78 break; 79 if (ch1 != ch2) { 80 if (xflag) { 81 dfound = 1; 82 (void)printf("%08llx %02x %02x\n", 83 (long long)byte - 1, ch1, ch2); 84 } else if (lflag) { 85 dfound = 1; 86 (void)printf("%6lld %3o %3o\n", 87 (long long)byte, ch1, ch2); 88 } else { 89 diffmsg(file1, file2, byte, line); 90 /* NOTREACHED */ 91 } 92 } 93 if (ch1 == '\n') 94 ++line; 95 } 96 97 eof: if (ferror(fp1)) 98 err(ERR_EXIT, "%s", file1); 99 if (ferror(fp2)) 100 err(ERR_EXIT, "%s", file2); 101 if (feof(fp1)) { 102 if (!feof(fp2)) 103 eofmsg(file1); 104 } else 105 if (feof(fp2)) 106 eofmsg(file2); 107 if (dfound) 108 exit(DIFF_EXIT); 109 } 110