1 /*- 2 * Copyright (c) 1991, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #ifndef lint 9 static char sccsid[] = "@(#)regular.c 8.3 (Berkeley) 04/02/94"; 10 #endif /* not lint */ 11 12 #include <sys/param.h> 13 #include <sys/mman.h> 14 #include <sys/stat.h> 15 16 #include <err.h> 17 #include <limits.h> 18 #include <stdlib.h> 19 #include <stdio.h> 20 #include <string.h> 21 22 #include "extern.h" 23 24 void 25 c_regular(fd1, file1, skip1, len1, fd2, file2, skip2, len2) 26 int fd1, fd2; 27 char *file1, *file2; 28 off_t skip1, len1, skip2, len2; 29 { 30 u_char ch, *p1, *p2; 31 off_t byte, length, line; 32 int dfound; 33 34 if (sflag && len1 != len2) 35 exit(1); 36 37 if (skip1 > len1) 38 eofmsg(file1); 39 len1 -= skip1; 40 if (skip2 > len2) 41 eofmsg(file2); 42 len2 -= skip2; 43 44 length = MIN(len1, len2); 45 if (length > SIZE_T_MAX) 46 return (c_special(fd1, file1, skip1, fd2, file2, skip2)); 47 48 if ((p1 = (u_char *)mmap(NULL, 49 (size_t)length, PROT_READ, 0, fd1, skip1)) == (u_char *)-1) 50 err(ERR_EXIT, "%s", file1); 51 if ((p2 = (u_char *)mmap(NULL, 52 (size_t)length, PROT_READ, 0, fd2, skip2)) == (u_char *)-1) 53 err(ERR_EXIT, "%s", file2); 54 55 dfound = 0; 56 for (byte = line = 1; length--; ++p1, ++p2, ++byte) { 57 if ((ch = *p1) != *p2) 58 if (lflag) { 59 dfound = 1; 60 (void)printf("%6qd %3o %3o\n", byte, ch, *p2); 61 } else 62 diffmsg(file1, file2, byte, line); 63 /* NOTREACHED */ 64 if (ch == '\n') 65 ++line; 66 } 67 68 if (len1 != len2) 69 eofmsg (len1 > len2 ? file2 : file1); 70 if (dfound) 71 exit(DIFF_EXIT); 72 } 73