/*
 * |-----------------------------------------------------------|
 * | Copyright (c) 1991, 1990 MIPS Computer Systems, Inc.      |
 * | All Rights Reserved                                       |
 * |-----------------------------------------------------------|
 * |          Restricted Rights Legend                         |
 * | Use, duplication, or disclosure by the Government is      |
 * | subject to restrictions as set forth in                   |
 * | subparagraph (c)(1)(ii) of the Rights in Technical        |
 * | Data and Computer Software Clause of DFARS 252.227-7013.  |
 * |         MIPS Computer Systems, Inc.                       |
 * |         950 DeGuigne Avenue                               |
 * |         Sunnyvale, California 94088-3650, USA             |
 * |-----------------------------------------------------------|
 */
#ident	"$Header: getprotoe.c,v 1.9.2.1 92/06/24 13:58:20 marker Exp $"

/*
 * Copyright (c) 1983 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

#include <stdio.h>
#include <bsd/sys/types.h>
#include <bsd/sys/socket.h>
#include <bsd/netdb.h>
#include <ctype.h>

#define	MAXALIASES	35

static char PROTODB[] = "/etc/protocols";
static FILE *protof = NULL;
static char line[BUFSIZ+1];
static struct protoent proto;
static char *proto_aliases[MAXALIASES];
static char *any();
int _proto_stayopen;

setprotoent(f)
	int f;
{
	if (protof == NULL)
		protof = fopen(PROTODB, "r" );
	else
		rewind(protof);
	_proto_stayopen |= f;
}

endprotoent()
{
	if (protof) {
		fclose(protof);
		protof = NULL;
	}
	_proto_stayopen = 0;
}

struct protoent *
getprotoent()
{
	char *p;
	register char *cp, **q;

	if (protof == NULL && (protof = fopen(PROTODB, "r" )) == NULL)
		return (NULL);
again:
	if ((p = fgets(line, BUFSIZ, protof)) == NULL)
		return (NULL);
	if (*p == '#')
		goto again;
	cp = any(p, "#\n");
	if (cp == NULL)
		goto again;
	*cp = '\0';
	proto.p_name = p;
	cp = any(p, " \t");
	if (cp == NULL)
		goto again;
	*cp++ = '\0';
	while (*cp == ' ' || *cp == '\t')
		cp++;
	p = any(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 = any(cp, " \t");
			if (cp != NULL)
				*cp++ = '\0';
		}
	}
	*q = NULL;
	return (&proto);
}

static char *
any(cp, match)
	register char *cp;
	char *match;
{
	register char *mp, c;

	while (c = *cp) {
		for (mp = match; *mp; mp++)
			if (*mp == c)
				return (cp);
		cp++;
	}
	return ((char *)0);
}
