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special.c revision 1.4 
      1 /*	$NetBSD: special.c,v 1.4 1997/10/18 12:52:25 lukem 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 #include <sys/cdefs.h>
     37 #ifndef lint
     38 #if 0
     39 static char sccsid[] = "@(#)special.c	8.3 (Berkeley) 4/2/94";
     40 #else
     41 __RCSID("$NetBSD: special.c,v 1.4 1997/10/18 12:52:25 lukem Exp $");
     42 #endif
     43 #endif /* not lint */
     44 
     45 #include <sys/types.h>
     46 
     47 #include <err.h>
     48 #include <stdlib.h>
     49 #include <stdio.h>
     50 #include <string.h>
     51 
     52 #include "extern.h"
     53 
     54 void
     55 c_special(fd1, file1, skip1, fd2, file2, skip2)
     56 	int fd1, fd2;
     57 	char *file1, *file2;
     58 	off_t skip1, skip2;
     59 {
     60 	int ch1, ch2;
     61 	off_t byte, line;
     62 	FILE *fp1, *fp2;
     63 	int dfound;
     64 
     65 	dfound = 0;
     66 	if ((fp1 = fdopen(fd1, "r")) == NULL)
     67 		err(ERR_EXIT, "%s", file1);
     68 	if ((fp2 = fdopen(fd2, "r")) == NULL)
     69 		err(ERR_EXIT, "%s", file2);
     70 
     71 	while (skip1--)
     72 		if (getc(fp1) == EOF)
     73 			goto eof;
     74 	while (skip2--)
     75 		if (getc(fp2) == EOF)
     76 			goto eof;
     77 
     78 	dfound = 0;
     79 	for (byte = line = 1;; ++byte) {
     80 		ch1 = getc(fp1);
     81 		ch2 = getc(fp2);
     82 		if (ch1 == EOF || ch2 == EOF)
     83 			break;
     84 		if (ch1 != ch2)
     85 			if (lflag) {
     86 				dfound = 1;
     87 				(void)printf("%6qd %3o %3o\n", byte, ch1, ch2);
     88 			} else
     89 				diffmsg(file1, file2, byte, line);
     90 				/* NOTREACHED */
     91 		if (ch1 == '\n')
     92 			++line;
     93 	}
     94 
     95 eof:	if (ferror(fp1))
     96 		err(ERR_EXIT, "%s", file1);
     97 	if (ferror(fp2))
     98 		err(ERR_EXIT, "%s", file2);
     99 	if (feof(fp1)) {
    100 		if (!feof(fp2))
    101 			eofmsg(file1);
    102 	} else
    103 		if (feof(fp2))
    104 			eofmsg(file2);
    105 	if (dfound)
    106 		exit(DIFF_EXIT);
    107 }
    108