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/*

 * 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. All advertising materials mentioning features or use of this software

 *    must display the following acknowledgement:

 *      This product includes software developed by the University of

 *      California, Berkeley and its contributors.

 * 4. 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.

 *

 *  $Id: getprotoent.c,v 1.2 2001-09-27 12:01:53 chris Exp $

 */

#if defined(LIBC_SCCS) && !defined(lint)

static char sccsid[] = "@(#)getprotoent.c       8.1 (Berkeley) 6/4/93";

#endif /* LIBC_SCCS and not lint */

#include <sys/types.h>

#include <sys/socket.h>

#include <netdb.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#define MAXALIASES      35

static FILE *protof = NULL;

static char line[BUFSIZ+1];

static struct protoent proto;

static char *proto_aliases[MAXALIASES];

int _proto_stayopen;

void

setprotoent(f)

        int f;

{

        if (protof == NULL)

                protof = fopen(_PATH_PROTOCOLS, "r" );

        else

                rewind(protof);

        _proto_stayopen |= f;

}

void

endprotoent()

{

        if (protof) {

                fclose(protof);

                protof = NULL;

        }

        _proto_stayopen = 0;

}

struct protoent *

getprotoent()

{

        char *p;

        register char *cp, **q;

        if (protof == NULL && (protof = fopen(_PATH_PROTOCOLS, "r" )) == NULL)

                return (NULL);

again:

        if ((p = fgets(line, BUFSIZ, protof)) == NULL)

                return (NULL);

        if (*p == '#')

                goto again;

        cp = strpbrk(p, "#\n");

        if (cp == NULL)

                goto again;

        *cp = '\0';

        proto.p_name = p;

        cp = strpbrk(p, " \t");

        if (cp == NULL)

                goto again;

        *cp++ = '\0';

        while (*cp == ' ' || *cp == '\t')

                cp++;

        p = strpbrk(cp, " \t");

        if (p != NULL)

                *p++ = '\0';

        proto.p_proto = atoi(cp);

        q = proto.p_aliases = proto_aliases;

        if (p != NULL) {

                cp = p;

                while (cp && *cp) {

                        if (*cp == ' ' || *cp == '\t') {

                                cp++;

                                continue;

                        }

                        if (q < &proto_aliases[MAXALIASES - 1])

                                *q++ = cp;

                        cp = strpbrk(cp, " \t");

                        if (cp != NULL)

                                *cp++ = '\0';

                }

        }

        *q = NULL;

        return (&proto);

}