1 /*- 2 * Copyright (c) 1991, 1993 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 8.1 (Berkeley) 06/06/93"; 10 #endif /* not lint */ 11 12 #include <sys/param.h> 13 #include <sys/mman.h> 14 #include <sys/stat.h> 15 16 #include <limits.h> 17 #include <errno.h> 18 #include <stdlib.h> 19 #include <stdio.h> 20 #include <string.h> 21 #include "extern.h" 22 23 void 24 c_regular(fd1, file1, skip1, len1, fd2, file2, skip2, len2) 25 int fd1, fd2; 26 char *file1, *file2; 27 off_t skip1, len1, skip2, len2; 28 { 29 register u_char ch, *p1, *p2; 30 register off_t byte, length, line; 31 int dfound; 32 33 if (sflag && len1 != len2) 34 exit(1); 35 36 if (skip1 > len1) 37 eofmsg(file1); 38 len1 -= skip1; 39 if (skip2 > len2) 40 eofmsg(file2); 41 len2 -= skip2; 42 43 length = MIN(len1, len2); 44 if (length > SIZE_T_MAX) 45 return (c_special(fd1, file1, skip1, fd2, file2, skip2)); 46 47 if ((p1 = (u_char *)mmap(NULL, 48 (size_t)length, PROT_READ, 0, fd1, skip1)) == (u_char *)-1) 49 err("%s: %s", file1, strerror(errno)); 50 if ((p2 = (u_char *)mmap(NULL, 51 (size_t)length, PROT_READ, 0, fd2, skip2)) == (u_char *)-1) 52 err("%s: %s", file2, strerror(errno)); 53 54 dfound = 0; 55 for (byte = line = 1; length--; ++p1, ++p2, ++byte) { 56 if ((ch = *p1) != *p2) 57 if (lflag) { 58 dfound = 1; 59 (void)printf("%6qd %3o %3o\n", byte, ch, *p2); 60 } else 61 diffmsg(file1, file2, byte, line); 62 /* NOTREACHED */ 63 if (ch == '\n') 64 ++line; 65 } 66 67 if (len1 != len2) 68 eofmsg (len1 > len2 ? file2 : file1); 69 if (dfound) 70 exit(1); 71 } 72