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