freebsd/bin/setfacl/file.c

/*
 * Copyright (c) 2001 Chris D. Faulhaber
 * All rights reserved.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR THE VOICES IN HIS HEAD 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.
 *
 * $FreeBSD$
 */

#include <sys/types.h>
#include <sys/acl.h>

#include <err.h>
#include <stdio.h>
#include <string.h>
#include <sysexits.h>

#include "setfacl.h"

/* read acl text from a file and return the corresponding acl */
acl_t
get_acl_from_file(const char *filename)
{
	FILE *file;
	char buf[BUFSIZ];

	if (!filename)
		err(EX_USAGE, "(null) filename in get_acl_from_file()");

	bzero(&buf, sizeof(buf));

	if (!strcmp(filename, "-")) {
		if (have_stdin)
			err(EX_USAGE, "cannot specify more than one stdin");
		file = stdin;
		have_stdin = 1;
	} else {
		file = fopen(filename, "r");
		if (!file)
			err(EX_OSERR, "fopen() %s failed", filename);
	}

	fread(buf, sizeof(buf), (size_t)1, file);
	if (ferror(file)) {
		fclose(file);
		err(EX_USAGE, "error reading from %s", filename);
	} else if (!feof(file)) {
		fclose(file);
		errx(EX_USAGE, "line too long in %s", filename);
	}

	fclose(file);

	return acl_from_text(buf);
}