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fgetln.c revision 1.6 
      1 /*	$NetBSD: fgetln.c,v 1.6 2005/05/15 21:31:26 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. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #include "nbtool_config.h"
     40 
     41 #if !HAVE_FGETLN
     42 #include <stdlib.h>
     43 #ifdef notdef
     44 /* These headers are required, but included from nbtool_config.h */
     45 #include <stdio.h>
     46 #include <unistd.h>
     47 #include <errno.h>
     48 #include <string.h>
     49 #endif
     50 
     51 char *
     52 fgetln(FILE *fp, size_t *len)
     53 {
     54 	static char *buf = NULL;
     55 	static size_t bufsiz = 0;
     56 	char *ptr;
     57 
     58 
     59 	if (buf == NULL) {
     60 		bufsiz = BUFSIZ;
     61 		if ((buf = malloc(bufsiz)) == NULL)
     62 			return NULL;
     63 	}
     64 
     65 	if (fgets(buf, bufsiz, fp) == NULL)
     66 		return NULL;
     67 
     68 	*len = 0;
     69 	while ((ptr = strchr(&buf[*len], '\n')) == NULL) {
     70 		size_t nbufsiz = bufsiz + BUFSIZ;
     71 		char *nbuf = realloc(buf, nbufsiz);
     72 
     73 		if (nbuf == NULL) {
     74 			int oerrno = errno;
     75 			free(buf);
     76 			errno = oerrno;
     77 			buf = NULL;
     78 			return NULL;
     79 		} else
     80 			buf = nbuf;
     81 
     82 		*len = bufsiz;
     83 		if (fgets(&buf[bufsiz], BUFSIZ, fp) == NULL)
     84 			return buf;
     85 
     86 		bufsiz = nbufsiz;
     87 	}
     88 
     89 	*len = (ptr - buf) + 1;
     90 	return buf;
     91 }
     92 
     93 #endif
     94