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      1 /*	$NetBSD: fgetln.c,v 1.9 2008/04/29 06:53:03 martin 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  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #ifdef HAVE_NBTOOL_CONFIG_H
     33 #include "nbtool_config.h"
     34 #endif
     35 
     36 #if !HAVE_FGETLN
     37 #include "config.h"
     38 #include <stdlib.h>
     39 #ifndef HAVE_NBTOOL_CONFIG_H
     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 		if (fgets(&buf[bufsiz], BUFSIZ, fp) == NULL) {
     79 			buf[bufsiz] = '\0';
     80 			*len = strlen(buf);
     81 			return buf;
     82 		}
     83 
     84 		*len = bufsiz;
     85 		bufsiz = nbufsiz;
     86 	}
     87 
     88 	*len = (ptr - buf) + 1;
     89 	return buf;
     90 }
     91 
     92 #endif
     93 
     94 #ifdef TEST
     95 int
     96 main(int argc, char *argv[])
     97 {
     98 	char *p;
     99 	size_t len;
    100 
    101 	while ((p = fgetln(stdin, &len)) != NULL) {
    102 		(void)printf("%zu %s", len, p);
    103 		free(p);
    104 	}
    105 	return 0;
    106 }
    107 #endif
    108