lib/libc/net/getprotoent_r.c

   1 /*      $NetBSD: getprotoent_r.c,v 1.6 2011/10/15 23:00:02 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
  35 static char sccsid[] = "@(#)getprotoent.c       8.1 (Berkeley) 6/4/93";
  36 #else
  37 __RCSID("$NetBSD: getprotoent_r.c,v 1.6 2011/10/15 23:00:02 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 #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
  56 void
  57 setprotoent_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
  66 void
  67 endprotoent_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
  85 struct protoent *
  86 getprotoent_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, "re")) == 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 }