getprotoent_r.c revision 1.5 
1/*	$NetBSD: getprotoent_r.c,v 1.5 2005/04/18 19:39:45 kleink 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 1.5 2005/04/18 19:39:45 kleink 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#include "protoent.h"
49
50#ifdef __weak_alias
51__weak_alias(endprotoent_r,_endprotoent_r)
52__weak_alias(getprotoent_r,_getprotoent_r)
53__weak_alias(setprotoent_r,_setprotoent_r)
54#endif
55
56void
57setprotoent_r(int f, struct protoent_data *pd)
58{
59	if (pd->fp == NULL)
60		pd->fp = fopen(_PATH_PROTOCOLS, "r");
61	else
62		rewind(pd->fp);
63	pd->stayopen |= f;
64}
65
66void
67endprotoent_r(struct protoent_data *pd)
68{
69	if (pd->fp) {
70		(void)fclose(pd->fp);
71		pd->fp = NULL;
72	}
73	if (pd->aliases) {
74		free(pd->aliases);
75		pd->aliases = NULL;
76		pd->maxaliases = 0;
77	}
78	if (pd->line) {
79		free(pd->line);
80		pd->line = NULL;
81	}
82	pd->stayopen = 0;
83}
84
85struct protoent *
86getprotoent_r(struct protoent *pr, struct protoent_data *pd)
87{
88	char *p, *cp, **q;
89	size_t i = 0;
90	int oerrno;
91
92	if (pd->fp == NULL && (pd->fp = fopen(_PATH_PROTOCOLS, "r")) == NULL)
93		return NULL;
94
95	for (;;) {
96		if (pd->line)
97			free(pd->line);
98		pd->line = fparseln(pd->fp, NULL, NULL, NULL,
99		    FPARSELN_UNESCALL);
100		if (pd->line == NULL)
101			return NULL;
102		pr->p_name = p = pd->line;
103		cp = strpbrk(p, " \t");
104		if (cp == NULL)
105			continue;
106		*cp++ = '\0';
107		while (*cp == ' ' || *cp == '\t')
108			cp++;
109		p = strpbrk(cp, " \t");
110		if (p != NULL)
111			*p++ = '\0';
112		pr->p_proto = atoi(cp);
113		if (pd->aliases == NULL) {
114			pd->maxaliases = 10;
115			pd->aliases = malloc(pd->maxaliases * sizeof(char *));
116			if (pd->aliases == NULL) {
117				oerrno = errno;
118				endprotoent_r(pd);
119				errno = oerrno;
120				return NULL;
121			}
122		}
123		q = pr->p_aliases = pd->aliases;
124		if (p != NULL) {
125			cp = p;
126			while (cp && *cp) {
127				if (*cp == ' ' || *cp == '\t') {
128					cp++;
129					continue;
130				}
131				if (i == pd->maxaliases - 2) {
132					pd->maxaliases *= 2;
133					q = realloc(q,
134					    pd->maxaliases * sizeof(char *));
135					if (q == NULL) {
136						oerrno = errno;
137						endprotoent_r(pd);
138						errno = oerrno;
139						return NULL;
140					}
141					pr->p_aliases = pd->aliases = q;
142				}
143				q[i++] = cp;
144
145				cp = strpbrk(cp, " \t");
146				if (cp != NULL)
147					*cp++ = '\0';
148			}
149		}
150		q[i] = NULL;
151		return pr;
152	}
153}
154