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fgetln.c revision 1.7 
      1 /*	$NetBSD: fgetln.c,v 1.7 2006/08/26 16:24:29 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1998 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Christos Zoulas.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. Neither the name of The NetBSD Foundation nor the names of its
     19  *    contributors may be used to endorse or promote products derived
     20  *    from this software without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     23  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     24  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     25  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     26  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     32  * POSSIBILITY OF SUCH DAMAGE.
     33  */
     34 
     35 #include "nbtool_config.h"
     36 
     37 #if !HAVE_FGETLN
     38 #include <stdlib.h>
     39 #ifdef notdef
     40 /* These headers are required, but included from nbtool_config.h */
     41 #include <stdio.h>
     42 #include <unistd.h>
     43 #include <errno.h>
     44 #include <string.h>
     45 #endif
     46 
     47 char *
     48 fgetln(FILE *fp, size_t *len)
     49 {
     50 	static char *buf = NULL;
     51 	static size_t bufsiz = 0;
     52 	char *ptr;
     53 
     54 
     55 	if (buf == NULL) {
     56 		bufsiz = BUFSIZ;
     57 		if ((buf = malloc(bufsiz)) == NULL)
     58 			return NULL;
     59 	}
     60 
     61 	if (fgets(buf, bufsiz, fp) == NULL)
     62 		return NULL;
     63 
     64 	*len = 0;
     65 	while ((ptr = strchr(&buf[*len], '\n')) == NULL) {
     66 		size_t nbufsiz = bufsiz + BUFSIZ;
     67 		char *nbuf = realloc(buf, nbufsiz);
     68 
     69 		if (nbuf == NULL) {
     70 			int oerrno = errno;
     71 			free(buf);
     72 			errno = oerrno;
     73 			buf = NULL;
     74 			return NULL;
     75 		} else
     76 			buf = nbuf;
     77 
     78 		*len = bufsiz;
     79 		if (fgets(&buf[bufsiz], BUFSIZ, fp) == NULL)
     80 			return buf;
     81 
     82 		bufsiz = nbufsiz;
     83 	}
     84 
     85 	*len = (ptr - buf) + 1;
     86 	return buf;
     87 }
     88 
     89 #endif
     90