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 #ifndef lint 35 static char sccsid[] = "@(#)regular.c 8.3 (Berkeley) 4/2/94"; 36 #endif /* not lint */ 37 38 #include <sys/param.h> 39 #include <sys/mman.h> 40 #include <sys/stat.h> 41 42 #include <err.h> 43 #include <limits.h> 44 #include <stdlib.h> 45 #include <stdio.h> 46 #include <string.h> 47 48 #include "extern.h" 49 50 void 51 c_regular(fd1, file1, skip1, len1, fd2, file2, skip2, len2) 52 int fd1, fd2; 53 char *file1, *file2; 54 off_t skip1, len1, skip2, len2; 55 { 56 u_char ch, *p1, *p2; 57 off_t byte, length, line; 58 int dfound; 59 60 if (sflag && len1 != len2) 61 exit(1); 62 63 if (skip1 > len1) 64 eofmsg(file1); 65 len1 -= skip1; 66 if (skip2 > len2) 67 eofmsg(file2); 68 len2 -= skip2; 69 70 length = MIN(len1, len2); 71 if (length > SIZE_T_MAX) 72 return (c_special(fd1, file1, skip1, fd2, file2, skip2)); 73 74 if ((p1 = (u_char *)mmap(NULL, 75 (size_t)length, PROT_READ, 0, fd1, skip1)) == (u_char *)-1) 76 err(ERR_EXIT, "%s", file1); 77 if ((p2 = (u_char *)mmap(NULL, 78 (size_t)length, PROT_READ, 0, fd2, skip2)) == (u_char *)-1) 79 err(ERR_EXIT, "%s", file2); 80 81 dfound = 0; 82 for (byte = line = 1; length--; ++p1, ++p2, ++byte) { 83 if ((ch = *p1) != *p2) 84 if (lflag) { 85 dfound = 1; 86 (void)printf("%6qd %3o %3o\n", byte, ch, *p2); 87 } else 88 diffmsg(file1, file2, byte, line); 89 /* NOTREACHED */ 90 if (ch == '\n') 91 ++line; 92 } 93 94 if (len1 != len2) 95 eofmsg (len1 > len2 ? file2 : file1); 96 if (dfound) 97 exit(DIFF_EXIT); 98 } 99