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getservbyname.c revision 1.7 
      1 /*	$NetBSD: getservbyname.c,v 1.7 1999/09/16 11:45:13 lukem 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 #include <sys/cdefs.h>
     37 #if defined(LIBC_SCCS) && !defined(lint)
     38 #if 0
     39 static char sccsid[] = "@(#)getservbyname.c	8.1 (Berkeley) 6/4/93";
     40 #else
     41 __RCSID("$NetBSD: getservbyname.c,v 1.7 1999/09/16 11:45:13 lukem Exp $");
     42 #endif
     43 #endif /* LIBC_SCCS and not lint */
     44 
     45 #include "namespace.h"
     46 #include <assert.h>
     47 #include <netdb.h>
     48 #include <string.h>
     49 
     50 #ifdef __weak_alias
     51 __weak_alias(getservbyname,_getservbyname);
     52 #endif
     53 
     54 extern int _serv_stayopen;
     55 
     56 struct servent *
     57 getservbyname(name, proto)
     58 	const char *name, *proto;
     59 {
     60 	register struct servent *p;
     61 	register char **cp;
     62 
     63 	_DIAGASSERT(name != NULL);
     64 	/* proto may be NULL */
     65 #ifdef _DIAGNOSTIC
     66 	if (name == NULL)
     67 		return (NULL);
     68 #endif
     69 
     70 	setservent(_serv_stayopen);
     71 	while ((p = getservent()) != NULL) {
     72 		if (strcmp(name, p->s_name) == 0)
     73 			goto gotname;
     74 		for (cp = p->s_aliases; *cp; cp++)
     75 			if (strcmp(name, *cp) == 0)
     76 				goto gotname;
     77 		continue;
     78 gotname:
     79 		if (proto == 0 || strcmp(p->s_proto, proto) == 0)
     80 			break;
     81 	}
     82 	if (!_serv_stayopen)
     83 		endservent();
     84 	return (p);
     85 }
     86