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regular.c revision 1.2 
      1 /*      $NetBSD: regular.c,v 1.2 1995/09/08 03:22:59 tls Exp $      */
      2 
      3 /*-
      4  * Copyright (c) 1991, 1993, 1994
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #ifndef lint
     37 #if 0
     38 static char sccsid[] = "@(#)regular.c	8.3 (Berkeley) 4/2/94";
     39 #else
     40 static char rcsid[] = "$NetBSD: regular.c,v 1.2 1995/09/08 03:22:59 tls Exp $";
     41 #endif
     42 #endif /* not lint */
     43 
     44 #include <sys/param.h>
     45 #include <sys/mman.h>
     46 #include <sys/stat.h>
     47 
     48 #include <err.h>
     49 #include <limits.h>
     50 #include <stdlib.h>
     51 #include <stdio.h>
     52 #include <string.h>
     53 
     54 #include "extern.h"
     55 
     56 void
     57 c_regular(fd1, file1, skip1, len1, fd2, file2, skip2, len2)
     58 	int fd1, fd2;
     59 	char *file1, *file2;
     60 	off_t skip1, len1, skip2, len2;
     61 {
     62 	u_char ch, *p1, *p2;
     63 	off_t byte, length, line;
     64 	int dfound;
     65 
     66 	if (sflag && len1 != len2)
     67 		exit(1);
     68 
     69 	if (skip1 > len1)
     70 		eofmsg(file1);
     71 	len1 -= skip1;
     72 	if (skip2 > len2)
     73 		eofmsg(file2);
     74 	len2 -= skip2;
     75 
     76 	length = MIN(len1, len2);
     77 	if (length > SIZE_T_MAX)
     78 		return (c_special(fd1, file1, skip1, fd2, file2, skip2));
     79 
     80 	if ((p1 = (u_char *)mmap(NULL,
     81 	    (size_t)length, PROT_READ, 0, fd1, skip1)) == (u_char *)-1)
     82 		err(ERR_EXIT, "%s", file1);
     83 	if ((p2 = (u_char *)mmap(NULL,
     84 	    (size_t)length, PROT_READ, 0, fd2, skip2)) == (u_char *)-1)
     85 		err(ERR_EXIT, "%s", file2);
     86 
     87 	dfound = 0;
     88 	for (byte = line = 1; length--; ++p1, ++p2, ++byte) {
     89 		if ((ch = *p1) != *p2)
     90 			if (lflag) {
     91 				dfound = 1;
     92 				(void)printf("%6qd %3o %3o\n", byte, ch, *p2);
     93 			} else
     94 				diffmsg(file1, file2, byte, line);
     95 				/* NOTREACHED */
     96 		if (ch == '\n')
     97 			++line;
     98 	}
     99 
    100 	if (len1 != len2)
    101 		eofmsg (len1 > len2 ? file2 : file1);
    102 	if (dfound)
    103 		exit(DIFF_EXIT);
    104 }
    105