text: /*	$NetBSD: getprotoent_r.c,v 1.6 2011/10/15 23:00:02 christos Exp $	*/
  
  /*
   * Copyright (c) 1983, 1993
   *	The Regents of the University of California.  All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. Neither the name of the University nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   */
  
  #include <sys/cdefs.h>
  #if defined(LIBC_SCCS) && !defined(lint)
  #if 0
  static char sccsid[] = "@(#)getprotoent.c	8.1 (Berkeley) 6/4/93";
  #else
  __RCSID("$NetBSD: getprotoent_r.c,v 1.6 2011/10/15 23:00:02 christos Exp $");
  #endif
  #endif /* LIBC_SCCS and not lint */
  
  #include <netdb.h>
  #include <stdio.h>
  #include <errno.h>
  #include <stdlib.h>
  #include <string.h>
  
  #include <FindDirectory.h>
  
  #include <libutil.h>
  #include "protoent.h"
  
  #ifdef __weak_alias
  __weak_alias(endprotoent_r,_endprotoent_r)
  __weak_alias(getprotoent_r,_getprotoent_r)
  __weak_alias(setprotoent_r,_setprotoent_r)
  #endif
  
  void
  setprotoent_r(int f, struct protoent_data *pd)
  {
  	if (pd->fp == NULL) {
  		char buffer[256];
  		find_directory(B_SYSTEM_DATA_DIRECTORY, 0, false, buffer, sizeof(buffer));
  		strlcat(buffer, "/network/protocols", sizeof(buffer));
  
  		pd->fp = fopen(buffer, "re");
  	} else
  		rewind(pd->fp);
  	pd->stayopen |= f;
  }
  
  void
  endprotoent_r(struct protoent_data *pd)
  {
  	if (pd->fp) {
  		(void)fclose(pd->fp);
  		pd->fp = NULL;
  	}
  	if (pd->aliases) {
  		free(pd->aliases);
  		pd->aliases = NULL;
  		pd->maxaliases = 0;
  	}
  	if (pd->line) {
  		free(pd->line);
  		pd->line = NULL;
  	}
  	pd->stayopen = 0;
  }
  
  struct protoent *
  getprotoent_r(struct protoent *pr, struct protoent_data *pd)
  {
  	char *p, *cp, **q;
  	size_t i = 0;
  	int oerrno;
  
  	if (pd->fp == NULL)
  		setprotoent_r(0, pd);
  	if (pd->fp == NULL)
  		return NULL;
  
  	for (;;) {
  		if (pd->line)
  			free(pd->line);
  		pd->line = fparseln(pd->fp, NULL, NULL, NULL,
  		    FPARSELN_UNESCALL);
  		if (pd->line == NULL)
  			return NULL;
  		pr->p_name = p = pd->line;
  		cp = strpbrk(p, " \t");
  		if (cp == NULL)
  			continue;
  		*cp++ = '\0';
  		while (*cp == ' ' || *cp == '\t')
  			cp++;
  		p = strpbrk(cp, " \t");
  		if (p != NULL)
  			*p++ = '\0';
  		pr->p_proto = atoi(cp);
  		if (pd->aliases == NULL) {
  			pd->maxaliases = 10;
  			pd->aliases = malloc(pd->maxaliases * sizeof(char *));
  			if (pd->aliases == NULL) {
  				oerrno = errno;
  				endprotoent_r(pd);
  				errno = oerrno;
  				return NULL;
  			}
  		}
  		q = pr->p_aliases = pd->aliases;
  		if (p != NULL) {
  			cp = p;
  			while (cp && *cp) {
  				if (*cp == ' ' || *cp == '\t') {
  					cp++;
  					continue;
  				}
  				if (i == pd->maxaliases - 2) {
  					pd->maxaliases *= 2;
  					q = realloc(q,
  					    pd->maxaliases * sizeof(char *));
  					if (q == NULL) {
  						oerrno = errno;
  						endprotoent_r(pd);
  						errno = oerrno;
  						return NULL;
  					}
  					pr->p_aliases = pd->aliases = q;
  				}
  				q[i++] = cp;
  
  				cp = strpbrk(cp, " \t");
  				if (cp != NULL)
  					*cp++ = '\0';
  			}
  		}
  		q[i] = NULL;
  		return pr;
  	}
  }
  