getprotoent_r.c revision 1.7 
1/*	$NetBSD: getprotoent_r.c,v 1.7 2022/03/12 08:41:38 nia 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 1.7 2022/03/12 08:41:38 nia 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, "re");
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
91	if (pd->fp == NULL && (pd->fp = fopen(_PATH_PROTOCOLS, "re")) == NULL)
92		return NULL;
93
94	for (;;) {
95		if (pd->line)
96			free(pd->line);
97		pd->line = fparseln(pd->fp, NULL, NULL, NULL,
98		    FPARSELN_UNESCALL);
99		if (pd->line == NULL)
100			return NULL;
101		pr->p_name = p = pd->line;
102		cp = strpbrk(p, " \t");
103		if (cp == NULL)
104			continue;
105		*cp++ = '\0';
106		while (*cp == ' ' || *cp == '\t')
107			cp++;
108		p = strpbrk(cp, " \t");
109		if (p != NULL)
110			*p++ = '\0';
111		pr->p_proto = atoi(cp);
112		if (pd->aliases == NULL) {
113			pd->aliases = NULL;
114			pd->maxaliases = 10;
115			if (reallocarr(&pd->aliases,
116			    pd->maxaliases, sizeof(char *)) != 0) {
117				endprotoent_r(pd);
118				errno = ENOMEM;
119				return NULL;
120			}
121		}
122		q = pr->p_aliases = pd->aliases;
123		if (p != NULL) {
124			cp = p;
125			while (cp && *cp) {
126				if (*cp == ' ' || *cp == '\t') {
127					cp++;
128					continue;
129				}
130				if (i == pd->maxaliases - 2) {
131					pd->maxaliases *= 2;
132					if (reallocarr(&q,
133					    pd->maxaliases, sizeof(char *)) != 0) {
134						endprotoent_r(pd);
135						errno = ENOMEM;
136						return NULL;
137					}
138					pr->p_aliases = pd->aliases = q;
139				}
140				q[i++] = cp;
141
142				cp = strpbrk(cp, " \t");
143				if (cp != NULL)
144					*cp++ = '\0';
145			}
146		}
147		q[i] = NULL;
148		return pr;
149	}
150}
151