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getprotoent.c revision 1.4 
      1 /*	$NetBSD: getprotoent.c,v 1.4 1995/02/25 06:20:35 cgd 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. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #if defined(LIBC_SCCS) && !defined(lint)
     37 #if 0
     38 static char sccsid[] = "@(#)getprotoent.c	8.1 (Berkeley) 6/4/93";
     39 #else
     40 static char rcsid[] = "$NetBSD: getprotoent.c,v 1.4 1995/02/25 06:20:35 cgd Exp $";
     41 #endif
     42 #endif /* LIBC_SCCS and not lint */
     43 
     44 #include <sys/types.h>
     45 #include <sys/socket.h>
     46 #include <netdb.h>
     47 #include <stdio.h>
     48 #include <stdlib.h>
     49 #include <string.h>
     50 
     51 #define	MAXALIASES	35
     52 
     53 static FILE *protof = NULL;
     54 static char line[BUFSIZ+1];
     55 static struct protoent proto;
     56 static char *proto_aliases[MAXALIASES];
     57 int _proto_stayopen;
     58 
     59 void
     60 setprotoent(f)
     61 	int f;
     62 {
     63 	if (protof == NULL)
     64 		protof = fopen(_PATH_PROTOCOLS, "r" );
     65 	else
     66 		rewind(protof);
     67 	_proto_stayopen |= f;
     68 }
     69 
     70 void
     71 endprotoent()
     72 {
     73 	if (protof) {
     74 		fclose(protof);
     75 		protof = NULL;
     76 	}
     77 	_proto_stayopen = 0;
     78 }
     79 
     80 struct protoent *
     81 getprotoent()
     82 {
     83 	char *p;
     84 	register char *cp, **q;
     85 
     86 	if (protof == NULL && (protof = fopen(_PATH_PROTOCOLS, "r" )) == NULL)
     87 		return (NULL);
     88 again:
     89 	if ((p = fgets(line, BUFSIZ, protof)) == NULL)
     90 		return (NULL);
     91 	if (*p == '#')
     92 		goto again;
     93 	cp = strpbrk(p, "#\n");
     94 	if (cp == NULL)
     95 		goto again;
     96 	*cp = '\0';
     97 	proto.p_name = p;
     98 	cp = strpbrk(p, " \t");
     99 	if (cp == NULL)
    100 		goto again;
    101 	*cp++ = '\0';
    102 	while (*cp == ' ' || *cp == '\t')
    103 		cp++;
    104 	p = strpbrk(cp, " \t");
    105 	if (p != NULL)
    106 		*p++ = '\0';
    107 	proto.p_proto = atoi(cp);
    108 	q = proto.p_aliases = proto_aliases;
    109 	if (p != NULL) {
    110 		cp = p;
    111 		while (cp && *cp) {
    112 			if (*cp == ' ' || *cp == '\t') {
    113 				cp++;
    114 				continue;
    115 			}
    116 			if (q < &proto_aliases[MAXALIASES - 1])
    117 				*q++ = cp;
    118 			cp = strpbrk(cp, " \t");
    119 			if (cp != NULL)
    120 				*cp++ = '\0';
    121 		}
    122 	}
    123 	*q = NULL;
    124 	return (&proto);
    125 }
    126