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regular.c revision 1.1 
      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 
     48 #include "extern.h"
     49 
     50 void
     51 c_regular(fd1, file1, skip1, len1, fd2, file2, skip2, len2)
     52 	int fd1, fd2;
     53 	char *file1, *file2;
     54 	off_t skip1, len1, skip2, len2;
     55 {
     56 	u_char ch, *p1, *p2;
     57 	off_t byte, length, line;
     58 	int dfound;
     59 
     60 	if (sflag && len1 != len2)
     61 		exit(1);
     62 
     63 	if (skip1 > len1)
     64 		eofmsg(file1);
     65 	len1 -= skip1;
     66 	if (skip2 > len2)
     67 		eofmsg(file2);
     68 	len2 -= skip2;
     69 
     70 	length = MIN(len1, len2);
     71 	if (length > SIZE_T_MAX)
     72 		return (c_special(fd1, file1, skip1, fd2, file2, skip2));
     73 
     74 	if ((p1 = (u_char *)mmap(NULL,
     75 	    (size_t)length, PROT_READ, 0, fd1, skip1)) == (u_char *)-1)
     76 		err(ERR_EXIT, "%s", file1);
     77 	if ((p2 = (u_char *)mmap(NULL,
     78 	    (size_t)length, PROT_READ, 0, fd2, skip2)) == (u_char *)-1)
     79 		err(ERR_EXIT, "%s", file2);
     80 
     81 	dfound = 0;
     82 	for (byte = line = 1; length--; ++p1, ++p2, ++byte) {
     83 		if ((ch = *p1) != *p2)
     84 			if (lflag) {
     85 				dfound = 1;
     86 				(void)printf("%6qd %3o %3o\n", byte, ch, *p2);
     87 			} else
     88 				diffmsg(file1, file2, byte, line);
     89 				/* NOTREACHED */
     90 		if (ch == '\n')
     91 			++line;
     92 	}
     93 
     94 	if (len1 != len2)
     95 		eofmsg (len1 > len2 ? file2 : file1);
     96 	if (dfound)
     97 		exit(DIFF_EXIT);
     98 }
     99