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 #include <unistd.h> 48 49 #include "extern.h" 50 51 #define ROUNDPAGE(i) ((i) & ~pagemask) 52 53 void 54 c_regular(fd1, file1, skip1, len1, fd2, file2, skip2, len2) 55 int fd1, fd2; 56 char *file1, *file2; 57 off_t skip1, len1, skip2, len2; 58 { 59 u_char ch, *p1, *p2; 60 off_t byte, length, line; 61 int dfound; 62 off_t pagemask, off1, off2; 63 64 if (sflag && len1 != len2) 65 exit(1); 66 67 if (skip1 > len1) 68 eofmsg(file1); 69 len1 -= skip1; 70 if (skip2 > len2) 71 eofmsg(file2); 72 len2 -= skip2; 73 74 pagemask = (off_t)getpagesize() - 1; 75 off1 = ROUNDPAGE(skip1); 76 off2 = ROUNDPAGE(skip2); 77 78 length = MIN(len1, len2); 79 if (length > SIZE_T_MAX) 80 return (c_special(fd1, file1, skip1, fd2, file2, skip2)); 81 82 if ((p1 = (u_char *)mmap(NULL, 83 (size_t)length, PROT_READ, MAP_SHARED, fd1, off1)) == (u_char *)MAP_FAILED) 84 err(ERR_EXIT, "%s", file1); 85 86 madvise(p1, length, MADV_SEQUENTIAL); 87 if ((p2 = (u_char *)mmap(NULL, 88 (size_t)length, PROT_READ, MAP_SHARED, fd2, off2)) == (u_char *)MAP_FAILED) 89 err(ERR_EXIT, "%s", file2); 90 madvise(p2, length, MADV_SEQUENTIAL); 91 92 dfound = 0; 93 p1 += skip1 - off1; 94 p2 += skip2 - off2; 95 for (byte = line = 1; length--; ++p1, ++p2, ++byte) { 96 if ((ch = *p1) != *p2) 97 if (lflag) { 98 dfound = 1; 99 (void)printf("%6qd %3o %3o\n", byte, ch, *p2); 100 } else 101 diffmsg(file1, file2, byte, line); 102 /* NOTREACHED */ 103 if (ch == '\n') 104 ++line; 105 } 106 107 if (len1 != len2) 108 eofmsg (len1 > len2 ? file2 : file1); 109 if (dfound) 110 exit(DIFF_EXIT); 111 } 112