GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.bin/cmp/cmp.c Lines: 28 52 53.8 %
Date: 2017-11-13 Branches: 25 49 51.0 %

Line Branch Exec Source
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/*      $OpenBSD: cmp.c,v 1.16 2016/10/28 07:22:59 schwarze Exp $      */
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/*      $NetBSD: cmp.c,v 1.7 1995/09/08 03:22:56 tls Exp $      */
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/*
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 * Copyright (c) 1987, 1990, 1993, 1994
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 *	The Regents of the University of California.  All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 * 3. Neither the name of the University nor the names of its contributors
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 *    may be used to endorse or promote products derived from this software
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 *    without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 */
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <err.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "extern.h"
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int	lflag, sflag;
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static void __dead usage(void);
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int
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main(int argc, char *argv[])
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{
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	struct stat sb1, sb2;
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	off_t skip1, skip2;
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	int ch, fd1, fd2, special;
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	char *file1, *file2;
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	if (pledge("stdio rpath flock cpath wpath", NULL) == -1)
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		err(ERR_EXIT, "pledge");
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	while ((ch = getopt(argc, argv, "ls")) != -1)
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		switch (ch) {
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		case 'l':		/* print all differences */
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			lflag = 1;
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			break;
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		case 's':		/* silent run */
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			sflag = 1;
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			break;
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		default:
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			usage();
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		}
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	argv += optind;
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	argc -= optind;
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	if (lflag && sflag)
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		errx(ERR_EXIT, "only one of -l and -s may be specified");
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	if (argc < 2 || argc > 4)
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		usage();
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	/* Backward compatibility -- handle "-" meaning stdin. */
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	special = 0;
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	if (strcmp(file1 = argv[0], "-") == 0) {
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		special = 1;
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		fd1 = 0;
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		file1 = "stdin";
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	} else if ((fd1 = open(file1, O_RDONLY, 0)) < 0) {
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		if (sflag)
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			return ERR_EXIT;
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		else
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			err(ERR_EXIT, "%s", file1);
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	}
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	if (strcmp(file2 = argv[1], "-") == 0) {
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		if (special) {
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			if (sflag)
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				return ERR_EXIT;
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			else
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				errx(ERR_EXIT,
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					"standard input may only be specified once");
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		}
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		special = 1;
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		fd2 = 0;
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		file2 = "stdin";
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	} else if ((fd2 = open(file2, O_RDONLY, 0)) < 0) {
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		if (sflag)
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			return ERR_EXIT;
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		else
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			err(ERR_EXIT, "%s", file2);
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	}
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	if (pledge("stdio flock rpath cpath wpath", NULL) == -1)
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		err(ERR_EXIT, "pledge");
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	skip1 = argc > 2 ? strtoll(argv[2], NULL, 0) : 0;
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	skip2 = argc == 4 ? strtoll(argv[3], NULL, 0) : 0;
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	if (!special) {
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		if (fstat(fd1, &sb1)) {
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			if (sflag)
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				return ERR_EXIT;
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			else
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				err(ERR_EXIT, "%s", file1);
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		}
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		if (!S_ISREG(sb1.st_mode))
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			special = 1;
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		else {
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			if (fstat(fd2, &sb2)) {
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				if (sflag)
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					return ERR_EXIT;
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				else
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					err(ERR_EXIT, "%s", file2);
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			}
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			if (!S_ISREG(sb2.st_mode))
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				special = 1;
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		}
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	}
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	if (special)
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		c_special(fd1, file1, skip1, fd2, file2, skip2);
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	else
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		c_regular(fd1, file1, skip1, sb1.st_size,
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		    fd2, file2, skip2, sb2.st_size);
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	return 0;
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}
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static void __dead
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usage(void)
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{
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	(void)fprintf(stderr,
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	    "usage: cmp [-l | -s] file1 file2 [skip1 [skip2]]\n");
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	exit(ERR_EXIT);
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}