#ifndef lint
static char *RCSid = "$Header$";
#endif

/*
 * getservent.c - read services file (based on BSD code)
 *
 * David A. Curry
 * Manager, UNIX Systems Programming Group
 * Purdue University Engineering Computer Network
 * 1285 Electrical Engineering Building
 * West Lafayette, IN 47907-1285 USA
 * davy@ecn.purdue.edu
 *
 * $Log$
 */
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>

#define	MAXALIASES	35

extern char	*portlistName;

int _serv_stayopen;
static FILE *servf = NULL;
static char line[BUFSIZ+1];
static struct servent serv;
static char *serv_aliases[MAXALIASES];

int
setservent(int f)
{
	if (servf == NULL)
		servf = fopen(portlistName, "r" );
	else
		rewind(servf);

	_serv_stayopen |= f;
}

int
endservent(void)
{
	if (servf) {
		fclose(servf);
		servf = NULL;
	}

	_serv_stayopen = 0;
}

struct servent *
getservent(void)
{
	char *p;
	register char *cp, **q;

	if (servf == NULL && (servf = fopen(_PATH_SERVICES, "r" )) == NULL)
		return (NULL);
again:
	if ((p = fgets(line, BUFSIZ, servf)) == NULL)
		return (NULL);
	if (*p == '#')
		goto again;
	cp = strpbrk(p, "#\n");
	if (cp == NULL)
		goto again;
	*cp = '\0';
	serv.s_name = p;
	p = strpbrk(p, " \t");
	if (p == NULL)
		goto again;
	*p++ = '\0';
	while (*p == ' ' || *p == '\t')
		p++;
	cp = strpbrk(p, ",/");
	if (cp == NULL)
		goto again;
	*cp++ = '\0';
	serv.s_port = htons((u_short)atoi(p));
	serv.s_proto = cp;
	q = serv.s_aliases = serv_aliases;
	cp = strpbrk(cp, " \t");
	if (cp != NULL)
		*cp++ = '\0';
	while (cp && *cp) {
		if (*cp == ' ' || *cp == '\t') {
			cp++;
			continue;
		}
		if (q < &serv_aliases[MAXALIASES - 1])
			*q++ = cp;
		cp = strpbrk(cp, " \t");
		if (cp != NULL)
			*cp++ = '\0';
	}
	*q = NULL;
	return (&serv);
}