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getprotoent.c revision 1.8 
      1 /*	$NetBSD: getprotoent.c,v 1.8 2003/08/07 16:43:09 agc 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.c,v 1.8 2003/08/07 16:43:09 agc Exp $");
     38 #endif
     39 #endif /* LIBC_SCCS and not lint */
     40 
     41 #include "namespace.h"
     42 #include <sys/types.h>
     43 #include <sys/socket.h>
     44 #include <netdb.h>
     45 #include <stdio.h>
     46 #include <stdlib.h>
     47 #include <string.h>
     48 
     49 #ifdef __weak_alias
     50 __weak_alias(endprotoent,_endprotoent)
     51 __weak_alias(getprotoent,_getprotoent)
     52 __weak_alias(setprotoent,_setprotoent)
     53 #endif
     54 
     55 #define	MAXALIASES	35
     56 
     57 static FILE *protof = NULL;
     58 static char line[BUFSIZ+1];
     59 static struct protoent proto;
     60 static char *proto_aliases[MAXALIASES];
     61 int _proto_stayopen;
     62 
     63 void
     64 setprotoent(f)
     65 	int f;
     66 {
     67 	if (protof == NULL)
     68 		protof = fopen(_PATH_PROTOCOLS, "r" );
     69 	else
     70 		rewind(protof);
     71 	_proto_stayopen |= f;
     72 }
     73 
     74 void
     75 endprotoent()
     76 {
     77 	if (protof) {
     78 		fclose(protof);
     79 		protof = NULL;
     80 	}
     81 	_proto_stayopen = 0;
     82 }
     83 
     84 struct protoent *
     85 getprotoent()
     86 {
     87 	char *p;
     88 	register char *cp, **q;
     89 
     90 	if (protof == NULL && (protof = fopen(_PATH_PROTOCOLS, "r" )) == NULL)
     91 		return (NULL);
     92 again:
     93 	if ((p = fgets(line, BUFSIZ, protof)) == NULL)
     94 		return (NULL);
     95 	if (*p == '#')
     96 		goto again;
     97 	cp = strpbrk(p, "#\n");
     98 	if (cp == NULL)
     99 		goto again;
    100 	*cp = '\0';
    101 	proto.p_name = p;
    102 	cp = strpbrk(p, " \t");
    103 	if (cp == NULL)
    104 		goto again;
    105 	*cp++ = '\0';
    106 	while (*cp == ' ' || *cp == '\t')
    107 		cp++;
    108 	p = strpbrk(cp, " \t");
    109 	if (p != NULL)
    110 		*p++ = '\0';
    111 	proto.p_proto = atoi(cp);
    112 	q = proto.p_aliases = proto_aliases;
    113 	if (p != NULL) {
    114 		cp = p;
    115 		while (cp && *cp) {
    116 			if (*cp == ' ' || *cp == '\t') {
    117 				cp++;
    118 				continue;
    119 			}
    120 			if (q < &proto_aliases[MAXALIASES - 1])
    121 				*q++ = cp;
    122 			cp = strpbrk(cp, " \t");
    123 			if (cp != NULL)
    124 				*cp++ = '\0';
    125 		}
    126 	}
    127 	*q = NULL;
    128 	return (&proto);
    129 }
    130