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