date and time created 91/04/15 11:47:09 by donn

[unix-history] / usr / src / lib / libc / net / getnetent.c

/*
 * Copyright (c) 1983 Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)getnetent.c	5.8 (Berkeley) %G%";
#endif /* LIBC_SCCS and not lint */

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <stdio.h>
#include <string.h>

#define	MAXALIASES	35

static FILE *netf;
static char line[BUFSIZ+1];
static struct netent net;
static char *net_aliases[MAXALIASES];
int _net_stayopen;

void
setnetent(f)
	int f;
{
	if (netf == NULL)
		netf = fopen(_PATH_NETWORKS, "r" );
	else
		rewind(netf);
	_net_stayopen |= f;
}

void
endnetent()
{
	if (netf) {
		fclose(netf);
		netf = NULL;
	}
	_net_stayopen = 0;
}

struct netent *
getnetent()
{
	char *p;
	register char *cp, **q;

	if (netf == NULL && (netf = fopen(_PATH_NETWORKS, "r" )) == NULL)
		return (NULL);
again:
	p = fgets(line, BUFSIZ, netf);
	if (p == NULL)
		return (NULL);
	if (*p == '#')
		goto again;
	cp = strpbrk(p, "#\n");
	if (cp == NULL)
		goto again;
	*cp = '\0';
	net.n_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';
	net.n_net = inet_network(cp);
	net.n_addrtype = AF_INET;
	q = net.n_aliases = net_aliases;
	if (p != NULL) 
		cp = p;
	while (cp && *cp) {
		if (*cp == ' ' || *cp == '\t') {
			cp++;
			continue;
		}
		if (q < &net_aliases[MAXALIASES - 1])
			*q++ = cp;
		cp = strpbrk(cp, " \t");
		if (cp != NULL)
			*cp++ = '\0';
	}
	*q = NULL;
	return (&net);
}