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File: [local] / src / usr.bin / readlink / readlink.c (download)

Revision 1.22, Tue May 9 17:44:53 2006 UTC (18 years ago) by deraadt
Branch: MAIN
CVS Tags: OPENBSD_4_0_BASE, OPENBSD_4_0
Changes since 1.21: +23 -26 lines

back out change that busted how the tree builds
not approved by the right people, not tested by the right people,
and work done by people who don't know how to test what they write
you know who you are -- stop screwing with things you refuse to test
completely.

/*
 * $OpenBSD: readlink.c,v 1.22 2006/05/09 17:44:53 deraadt Exp $
 *
 * Copyright (c) 1997
 *	Kenneth Stailey (hereinafter referred to as the author)
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <limits.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

int
main(int argc, char *argv[])
{
	char buf[PATH_MAX];
	int n, ch, nflag = 0, fflag = 0;
	extern int optind;

	while ((ch = getopt(argc, argv, "fn")) != -1)
		switch (ch) {
		case 'f':
			fflag = 1;
			break;
		case 'n':
			nflag = 1;
			break;
		default:
			(void)fprintf(stderr,
			    "usage: readlink [-n] [-f] symlink\n");
			exit(1);
		}
	argc -= optind;
	argv += optind;

	if (argc != 1) {
		fprintf(stderr, "usage: readlink [-n] [-f] symlink\n");
		exit(1);
	}

	n = strlen(argv[0]);
	if (n > PATH_MAX - 1) {
		fprintf(stderr,
			"readlink: filename longer than PATH_MAX-1 (%d)\n",
			PATH_MAX - 1);
		exit(1);
	}

	if (fflag)
		realpath(argv[0], buf);
	else {
		if ((n = readlink(argv[0], buf, sizeof buf-1)) < 0)
			exit(1);
		buf[n] = '\0';
	}

	printf("%s", buf);
	if (!nflag)
		putchar('\n');
	exit(0);
}