getprotoname.c revision 1.7 
1/*	$OpenBSD: getprotoname.c,v 1.7 2005/08/06 20:30:03 espie Exp $ */
2/*
3 * Copyright (c) 1983, 1993
4 *	The Regents of the University of California.  All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. Neither the name of the University nor the names of its contributors
15 *    may be used to endorse or promote products derived from this software
16 *    without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31#include <netdb.h>
32#include <stdio.h>
33#include <string.h>
34
35int
36getprotobyname_r(const char *name, struct protoent *pe,
37    struct protoent_data *pd)
38{
39	char **cp;
40	int error;
41
42	setprotoent_r(pd->stayopen, pd);
43	while ((error = getprotoent_r(pe, pd)) == 0) {
44		if (strcmp(pe->p_name, name) == 0)
45			break;
46		for (cp = pe->p_aliases; *cp != 0; cp++)
47			if (strcmp(*cp, name) == 0)
48				goto found;
49	}
50found:
51	if (!pd->stayopen && pd->fp != NULL) {
52		fclose(pd->fp);
53		pd->fp = NULL;
54	}
55	return (error);
56}
57
58struct protoent *
59getprotobyname(const char *name)
60{
61	extern struct protoent_data _protoent_data;
62	static struct protoent proto;
63
64	if (getprotobyname_r(name, &proto, &_protoent_data) != 0)
65		return (NULL);
66	return (&proto);
67}
68