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. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD: head/usr.bin/cmp/special.c 223376 2011-06-21 20:44:06Z delphij $ 30 * 31 * @(#)special.c 8.3 (Berkeley) 4/2/94 32 */ 33 34 #include <sys/types.h> 35 36 #include <err.h> 37 #include <stdint.h> 38 #include <stdlib.h> 39 #include <stdio.h> 40 #include <string.h> 41 42 #include "extern.h" 43 44 void 45 c_special(int fd1, const char *file1, off_t skip1, 46 int fd2, const char *file2, off_t skip2) 47 { 48 int ch1, ch2; 49 off_t byte, line; 50 FILE *fp1, *fp2; 51 int dfound; 52 53 if ((fp1 = fdopen(fd1, "r")) == NULL) 54 err(ERR_EXIT, "%s", file1); 55 if ((fp2 = fdopen(fd2, "r")) == NULL) 56 err(ERR_EXIT, "%s", file2); 57 58 dfound = 0; 59 while (skip1--) 60 if (getc(fp1) == EOF) 61 goto eof; 62 while (skip2--) 63 if (getc(fp2) == EOF) 64 goto eof; 65 66 for (byte = line = 1;; ++byte) { 67 ch1 = getc(fp1); 68 ch2 = getc(fp2); 69 if (ch1 == EOF || ch2 == EOF) 70 break; 71 if (ch1 != ch2) { 72 if (xflag) { 73 dfound = 1; 74 printf("%08jx %02x %02x\n", 75 (intmax_t)byte - 1, ch1, ch2); 76 } else if (lflag) { 77 dfound = 1; 78 printf("%6jd %3o %3o\n", 79 (intmax_t)byte, ch1, ch2); 80 } else { 81 diffmsg(file1, file2, byte, line); 82 /* NOTREACHED */ 83 } 84 } 85 if (ch1 == '\n') 86 ++line; 87 } 88 89 eof: if (ferror(fp1)) 90 err(ERR_EXIT, "%s", file1); 91 if (ferror(fp2)) 92 err(ERR_EXIT, "%s", file2); 93 if (feof(fp1)) { 94 if (!feof(fp2)) 95 eofmsg(file1); 96 } else 97 if (feof(fp2)) 98 eofmsg(file2); 99 if (dfound) 100 exit(DIFF_EXIT); 101 } 102