1 /*- 2 * Copyright (c) 1991 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #ifndef lint 9 static char sccsid[] = "@(#)regular.c 5.4 (Berkeley) 06/21/92"; 10 #endif /* not lint */ 11 12 #include <sys/param.h> 13 #include <sys/mman.h> 14 #include <sys/stat.h> 15 #include <errno.h> 16 #include <stdlib.h> 17 #include <stdio.h> 18 #include <string.h> 19 #include "extern.h" 20 21 void 22 c_regular(fd1, file1, skip1, len1, fd2, file2, skip2, len2) 23 int fd1, fd2; 24 char *file1, *file2; 25 off_t skip1, len1, skip2, len2; 26 { 27 register u_char ch, *p1, *p2; 28 register off_t byte, length, line; 29 int dfound; 30 31 if (sflag && len1 != len2) 32 exit(1); 33 34 if (skip1 > len1) 35 eofmsg(file1); 36 len1 -= skip1; 37 if (skip2 > len2) 38 eofmsg(file2); 39 len2 -= skip2; 40 41 length = MIN(len1, len2); 42 if ((p1 = (u_char *)mmap(NULL, 43 (size_t)length, PROT_READ, MAP_FILE, fd1, skip1)) == (u_char *)-1) 44 err("%s: %s", file1, strerror(errno)); 45 if ((p2 = (u_char *)mmap(NULL, 46 (size_t)length, PROT_READ, MAP_FILE, fd2, skip2)) == (u_char *)-1) 47 err("%s: %s", file2, strerror(errno)); 48 49 dfound = 0; 50 for (byte = line = 1; length--; ++p1, ++p2, ++byte) { 51 if ((ch = *p1) != *p2) 52 if (lflag) { 53 dfound = 1; 54 (void)printf("%6qd %3o %3o\n", byte, ch, *p2); 55 } else 56 diffmsg(file1, file2, byte, line); 57 /* NOTREACHED */ 58 if (ch == '\n') 59 ++line; 60 } 61 62 if (len1 != len2) 63 eofmsg (len1 > len2 ? file2 : file1); 64 if (dfound) 65 exit(1); 66 } 67