getprotoent_r.c revision 1.3 
1/*	$NetBSD: getprotoent_r.c,v 1.3 2004/02/24 15:28:07 christos Exp $	*/
2
3/*
4 * Copyright (c) 1983, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33#if defined(LIBC_SCCS) && !defined(lint)
34#if 0
35static char sccsid[] = "@(#)getprotoent.c	8.1 (Berkeley) 6/4/93";
36#else
37__RCSID("$NetBSD: getprotoent_r.c,v 1.3 2004/02/24 15:28:07 christos Exp $");
38#endif
39#endif /* LIBC_SCCS and not lint */
40
41#include "namespace.h"
42#include <netdb.h>
43#include <stdio.h>
44#include <errno.h>
45#include <stdlib.h>
46#include <string.h>
47
48#ifdef __weak_alias
49__weak_alias(endprotoent_r,_endprotoent_r)
50__weak_alias(getprotoent_r,_getprotoent_r)
51__weak_alias(setprotoent_r,_setprotoent_r)
52#endif
53
54void
55setprotoent_r(int f, struct protoent_data *pd)
56{
57	if (pd->fp == NULL)
58		pd->fp = fopen(_PATH_PROTOCOLS, "r");
59	else
60		rewind(pd->fp);
61	pd->stayopen |= f;
62}
63
64void
65endprotoent_r(struct protoent_data *pd)
66{
67	if (pd->fp) {
68		(void)fclose(pd->fp);
69		pd->fp = NULL;
70	}
71	if (pd->aliases) {
72		free(pd->aliases);
73		pd->aliases = NULL;
74		pd->maxaliases = 0;
75	}
76	if (pd->line) {
77		free(pd->line);
78		pd->line = NULL;
79	}
80	pd->stayopen = 0;
81}
82
83struct protoent *
84getprotoent_r(struct protoent *pr, struct protoent_data *pd)
85{
86	char *p, *cp, **q;
87	size_t i = 0;
88	int oerrno;
89
90	if (pd->fp == NULL && (pd->fp = fopen(_PATH_PROTOCOLS, "r")) == NULL)
91		return NULL;
92
93	for (;;) {
94		if (pd->line)
95			free(pd->line);
96		pd->line = fparseln(pd->fp, NULL, NULL, NULL,
97		    FPARSELN_UNESCALL);
98		if (pd->line == NULL)
99			return NULL;
100		pr->p_name = p = pd->line;
101		cp = strpbrk(p, " \t");
102		if (cp == NULL)
103			continue;
104		*cp++ = '\0';
105		while (*cp == ' ' || *cp == '\t')
106			cp++;
107		p = strpbrk(cp, " \t");
108		if (p != NULL)
109			*p++ = '\0';
110		pr->p_proto = atoi(cp);
111		if (pd->aliases == NULL) {
112			pd->maxaliases = 10;
113			pd->aliases = malloc(pd->maxaliases * sizeof(char **));
114			if (pd->aliases == NULL) {
115				oerrno = errno;
116				endprotoent_r(pd);
117				errno = oerrno;
118				return NULL;
119			}
120		}
121		q = pr->p_aliases = pd->aliases;
122		if (p != NULL) {
123			cp = p;
124			while (cp && *cp) {
125				if (*cp == ' ' || *cp == '\t') {
126					cp++;
127					continue;
128				}
129				if (i == pd->maxaliases - 2) {
130					pd->maxaliases *= 2;
131					q = realloc(q,
132					    pd->maxaliases * sizeof(char **));
133					if (q == NULL) {
134						oerrno = errno;
135						endprotoent_r(pd);
136						errno = oerrno;
137						return NULL;
138					}
139					pr->p_aliases = pd->aliases = q;
140				}
141				q[i++] = cp;
142
143				cp = strpbrk(cp, " \t");
144				if (cp != NULL)
145					*cp++ = '\0';
146			}
147		}
148		q[i] = NULL;
149		return pr;
150	}
151}
152