getprotoent.c revision 92889 
1/*
2 * Copyright (c) 1983, 1993
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#if defined(LIBC_SCCS) && !defined(lint)
35static char sccsid[] = "@(#)getprotoent.c	8.1 (Berkeley) 6/4/93";
36#endif /* LIBC_SCCS and not lint */
37#include <sys/cdefs.h>
38__FBSDID("$FreeBSD: head/lib/libc/net/getprotoent.c 92889 2002-03-21 18:49:23Z obrien $");
39
40#include <sys/types.h>
41#include <sys/socket.h>
42#include <netdb.h>
43#include <stdio.h>
44#include <stdlib.h>
45#include <string.h>
46
47#define	MAXALIASES	35
48
49static FILE *protof = NULL;
50static char line[BUFSIZ+1];
51static struct protoent proto;
52static char *proto_aliases[MAXALIASES];
53int _proto_stayopen;
54
55void
56setprotoent(f)
57	int f;
58{
59	if (protof == NULL)
60		protof = fopen(_PATH_PROTOCOLS, "r" );
61	else
62		rewind(protof);
63	_proto_stayopen |= f;
64}
65
66void
67endprotoent()
68{
69	if (protof) {
70		fclose(protof);
71		protof = NULL;
72	}
73	_proto_stayopen = 0;
74}
75
76struct protoent *
77getprotoent()
78{
79	char *p;
80	char *cp, **q;
81
82	if (protof == NULL && (protof = fopen(_PATH_PROTOCOLS, "r" )) == NULL)
83		return (NULL);
84again:
85	if ((p = fgets(line, BUFSIZ, protof)) == NULL)
86		return (NULL);
87	if (*p == '#')
88		goto again;
89	cp = strpbrk(p, "#\n");
90	if (cp == NULL)
91		goto again;
92	*cp = '\0';
93	proto.p_name = p;
94	cp = strpbrk(p, " \t");
95	if (cp == NULL)
96		goto again;
97	*cp++ = '\0';
98	while (*cp == ' ' || *cp == '\t')
99		cp++;
100	p = strpbrk(cp, " \t");
101	if (p != NULL)
102		*p++ = '\0';
103	proto.p_proto = atoi(cp);
104	q = proto.p_aliases = proto_aliases;
105	if (p != NULL) {
106		cp = p;
107		while (cp && *cp) {
108			if (*cp == ' ' || *cp == '\t') {
109				cp++;
110				continue;
111			}
112			if (q < &proto_aliases[MAXALIASES - 1])
113				*q++ = cp;
114			cp = strpbrk(cp, " \t");
115			if (cp != NULL)
116				*cp++ = '\0';
117		}
118	}
119	*q = NULL;
120	return (&proto);
121}
122