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getprotoent.c revision 1.2 
      1 /*
      2  * Copyright (c) 1983 Regents of the University of California.
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  */
     33 
     34 #if defined(LIBC_SCCS) && !defined(lint)
     35 /*static char sccsid[] = "from: @(#)getprotoent.c	5.8 (Berkeley) 2/24/91";*/
     36 static char rcsid[] = "$Id: getprotoent.c,v 1.2 1993/08/01 18:39:46 mycroft Exp $";
     37 #endif /* LIBC_SCCS and not lint */
     38 
     39 #include <sys/types.h>
     40 #include <sys/socket.h>
     41 #include <netdb.h>
     42 #include <stdio.h>
     43 #include <stdlib.h>
     44 #include <string.h>
     45 
     46 #define	MAXALIASES	35
     47 
     48 static FILE *protof = NULL;
     49 static char line[BUFSIZ+1];
     50 static struct protoent proto;
     51 static char *proto_aliases[MAXALIASES];
     52 int _proto_stayopen;
     53 
     54 void
     55 setprotoent(f)
     56 	int f;
     57 {
     58 	if (protof == NULL)
     59 		protof = fopen(_PATH_PROTOCOLS, "r" );
     60 	else
     61 		rewind(protof);
     62 	_proto_stayopen |= f;
     63 }
     64 
     65 void
     66 endprotoent()
     67 {
     68 	if (protof) {
     69 		fclose(protof);
     70 		protof = NULL;
     71 	}
     72 	_proto_stayopen = 0;
     73 }
     74 
     75 struct protoent *
     76 getprotoent()
     77 {
     78 	char *p;
     79 	register char *cp, **q;
     80 
     81 	if (protof == NULL && (protof = fopen(_PATH_PROTOCOLS, "r" )) == NULL)
     82 		return (NULL);
     83 again:
     84 	if ((p = fgets(line, BUFSIZ, protof)) == NULL)
     85 		return (NULL);
     86 	if (*p == '#')
     87 		goto again;
     88 	cp = strpbrk(p, "#\n");
     89 	if (cp == NULL)
     90 		goto again;
     91 	*cp = '\0';
     92 	proto.p_name = p;
     93 	cp = strpbrk(p, " \t");
     94 	if (cp == NULL)
     95 		goto again;
     96 	*cp++ = '\0';
     97 	while (*cp == ' ' || *cp == '\t')
     98 		cp++;
     99 	p = strpbrk(cp, " \t");
    100 	if (p != NULL)
    101 		*p++ = '\0';
    102 	proto.p_proto = atoi(cp);
    103 	q = proto.p_aliases = proto_aliases;
    104 	if (p != NULL) {
    105 		cp = p;
    106 		while (cp && *cp) {
    107 			if (*cp == ' ' || *cp == '\t') {
    108 				cp++;
    109 				continue;
    110 			}
    111 			if (q < &proto_aliases[MAXALIASES - 1])
    112 				*q++ = cp;
    113 			cp = strpbrk(cp, " \t");
    114 			if (cp != NULL)
    115 				*cp++ = '\0';
    116 		}
    117 	}
    118 	*q = NULL;
    119 	return (&proto);
    120 }
    121