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      1 /*	$NetBSD: special.c,v 1.14 2011/11/28 10:10:10 wiz 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. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #ifndef lint
     34 #if 0
     35 static char sccsid[] = "@(#)special.c	8.3 (Berkeley) 4/2/94";
     36 #else
     37 __RCSID("$NetBSD: special.c,v 1.14 2011/11/28 10:10:10 wiz Exp $");
     38 #endif
     39 #endif /* not lint */
     40 
     41 #include <sys/types.h>
     42 
     43 #include <err.h>
     44 #include <stdlib.h>
     45 #include <stdio.h>
     46 
     47 #include "extern.h"
     48 
     49 void
     50 c_special(int fd1, const char *file1, off_t skip1, int fd2, const char *file2, off_t skip2)
     51 {
     52 	int ch1, ch2;
     53 	off_t byte, line;
     54 	FILE *fp1, *fp2;
     55 	int dfound;
     56 
     57 	dfound = 0;
     58 	if ((fp1 = fdopen(fd1, "r")) == NULL)
     59 		err(ERR_EXIT, "%s", file1);
     60 	if ((fp2 = fdopen(fd2, "r")) == NULL)
     61 		err(ERR_EXIT, "%s", file2);
     62 
     63 	for (byte = line = 1; skip1--; byte++) {
     64 		ch1 = getc(fp1);
     65 		if (ch1 == EOF)
     66 			goto eof;
     67 		if (ch1 == '\n')
     68 			line++;
     69 	}
     70 	for (byte = line = 1; skip2--; byte++) {
     71 		ch2 = getc(fp2);
     72 		if (ch2 == EOF)
     73 			goto eof;
     74 		if (ch2 == '\n')
     75 			line++;
     76 	}
     77 	dfound = 0;
     78 	for (byte = line = 1;; ++byte) {
     79 		ch1 = getc(fp1);
     80 		ch2 = getc(fp2);
     81 		if (ch1 == EOF || ch2 == EOF)
     82 			break;
     83 		if (ch1 != ch2) {
     84 			if (lflag) {
     85 				dfound = 1;
     86 				(void)printf("%6lld %3o %3o\n", (long long)byte,
     87 				    ch1, ch2);
     88 			} else
     89 				diffmsg(file1, file2, byte, line);
     90 				/* NOTREACHED */
     91 		}
     92 		if (ch1 == '\n')
     93 			++line;
     94 	}
     95 
     96  eof:
     97 	if (ferror(fp1))
     98 		errmsg(file1, byte, line);
     99 	if (ferror(fp2))
    100 		errmsg(file2, byte, line);
    101 	if (feof(fp1)) {
    102 		if (!feof(fp2))
    103 			eofmsg(file1, byte, line);
    104 	} else
    105 		if (feof(fp2))
    106 			eofmsg(file2, byte, line);
    107 	(void)fclose(fp1);
    108 	(void)fclose(fp2);
    109 	if (dfound)
    110 		exit(DIFF_EXIT);
    111 }
    112