xref: /src/tools/compat/fgetln.c

/*	$NetBSD: fgetln.c,v 1.8 2006/10/18 15:17:38 christos Exp $	*/

/*-
 * Copyright (c) 1998 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Christos Zoulas.
 *
 * 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. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
 */

#ifdef HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif

#if !HAVE_FGETLN
#include <stdlib.h>
#ifndef HAVE_NBTOOL_CONFIG_H
/* These headers are required, but included from nbtool_config.h */
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#endif

char *
fgetln(FILE *fp, size_t *len)
{
	static char *buf = NULL;
	static size_t bufsiz = 0;
	char *ptr;


	if (buf == NULL) {
		bufsiz = BUFSIZ;
		if ((buf = malloc(bufsiz)) == NULL)
			return NULL;
	}

	if (fgets(buf, bufsiz, fp) == NULL)
		return NULL;

	*len = 0;
	while ((ptr = strchr(&buf[*len], '\n')) == NULL) {
		size_t nbufsiz = bufsiz + BUFSIZ;
		char *nbuf = realloc(buf, nbufsiz);

		if (nbuf == NULL) {
			int oerrno = errno;
			free(buf);
			errno = oerrno;
			buf = NULL;
			return NULL;
		} else
			buf = nbuf;

		if (fgets(&buf[bufsiz], BUFSIZ, fp) == NULL) {
			buf[bufsiz] = '\0';
			*len = strlen(buf);
			return buf;
		}

		*len = bufsiz;
		bufsiz = nbufsiz;
	}

	*len = (ptr - buf) + 1;
	return buf;
}

#endif

#ifdef TEST
int
main(int argc, char *argv[])
{
	char *p;
	size_t len;

	while ((p = fgetln(stdin, &len)) != NULL) {
		(void)printf("%zu %s", len, p);
		free(p);
	}
	return 0;
}
#endif