getprotoent.c revision 1574 
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
38#include <sys/types.h>
39#include <sys/socket.h>
40#include <netdb.h>
41#include <stdio.h>
42#include <stdlib.h>
43#include <string.h>
44
45#define	MAXALIASES	35
46
47static FILE *protof = NULL;
48static char line[BUFSIZ+1];
49static struct protoent proto;
50static char *proto_aliases[MAXALIASES];
51int _proto_stayopen;
52
53void
54setprotoent(f)
55	int f;
56{
57	if (protof == NULL)
58		protof = fopen(_PATH_PROTOCOLS, "r" );
59	else
60		rewind(protof);
61	_proto_stayopen |= f;
62}
63
64void
65endprotoent()
66{
67	if (protof) {
68		fclose(protof);
69		protof = NULL;
70	}
71	_proto_stayopen = 0;
72}
73
74struct protoent *
75getprotoent()
76{
77	char *p;
78	register char *cp, **q;
79
80	if (protof == NULL && (protof = fopen(_PATH_PROTOCOLS, "r" )) == NULL)
81		return (NULL);
82again:
83	if ((p = fgets(line, BUFSIZ, protof)) == NULL)
84		return (NULL);
85	if (*p == '#')
86		goto again;
87	cp = strpbrk(p, "#\n");
88	if (cp == NULL)
89		goto again;
90	*cp = '\0';
91	proto.p_name = p;
92	cp = strpbrk(p, " \t");
93	if (cp == NULL)
94		goto again;
95	*cp++ = '\0';
96	while (*cp == ' ' || *cp == '\t')
97		cp++;
98	p = strpbrk(cp, " \t");
99	if (p != NULL)
100		*p++ = '\0';
101	proto.p_proto = atoi(cp);
102	q = proto.p_aliases = proto_aliases;
103	if (p != NULL) {
104		cp = p;
105		while (cp && *cp) {
106			if (*cp == ' ' || *cp == '\t') {
107				cp++;
108				continue;
109			}
110			if (q < &proto_aliases[MAXALIASES - 1])
111				*q++ = cp;
112			cp = strpbrk(cp, " \t");
113			if (cp != NULL)
114				*cp++ = '\0';
115		}
116	}
117	*q = NULL;
118	return (&proto);
119}
120