compat_fgetln.c

   1 #include "config.h"
   2
   3 #if HAVE_FGETLN
   4
   5 int dummy;
   6
   7 #else
   8
   9 /*      $NetBSD: fgetln.c,v 1.3 2006/09/25 07:18:17 lukem Exp $ */
  10
  11 /*-
  12  * Copyright (c) 1998 The NetBSD Foundation, Inc.
  13  * All rights reserved.
  14  *
  15  * This code is derived from software contributed to The NetBSD Foundation
  16  * by Christos Zoulas.
  17  *
  18  * Redistribution and use in source and binary forms, with or without
  19  * modification, are permitted provided that the following conditions
  20  * are met:
  21  * 1. Redistributions of source code must retain the above copyright
  22  *    notice, this list of conditions and the following disclaimer.
  23  * 2. Redistributions in binary form must reproduce the above copyright
  24  *    notice, this list of conditions and the following disclaimer in the
  25  *    documentation and/or other materials provided with the distribution.
  26  * 3. Neither the name of The NetBSD Foundation nor the names of its
  27  *    contributors may be used to endorse or promote products derived
  28  *    from this software without specific prior written permission.
  29  *
  30  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  31  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  32  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  33  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  34  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  35  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  36  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  37  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  38  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  39  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  40  * POSSIBILITY OF SUCH DAMAGE.
  41  */
  42
  43 #include <sys/types.h>
  44
  45 #include <errno.h>
  46 #include <stdio.h>
  47 #include <stdlib.h>
  48 #include <string.h>
  49
  50 char *
  51 fgetln(fp, len)
  52         FILE *fp;
  53         size_t *len;
  54 {
  55         static char *buf = NULL;
  56         static size_t bufsiz = 0;
  57         char *ptr;
  58
  59
  60         if (buf == NULL) {
  61                 bufsiz = BUFSIZ;
  62                 if ((buf = malloc(bufsiz)) == NULL)
  63                         return NULL;
  64         }
  65
  66         if (fgets(buf, bufsiz, fp) == NULL)
  67                 return NULL;
  68
  69         *len = 0;
  70         while ((ptr = strchr(&buf[*len], '\n')) == NULL) {
  71                 size_t nbufsiz = bufsiz + BUFSIZ;
  72                 char *nbuf = realloc(buf, nbufsiz);
  73
  74                 if (nbuf == NULL) {
  75                         int oerrno = errno;
  76                         free(buf);
  77                         errno = oerrno;
  78                         buf = NULL;
  79                         return NULL;
  80                 } else
  81                         buf = nbuf;
  82
  83                 *len = bufsiz;
  84                 if (fgets(&buf[bufsiz], BUFSIZ, fp) == NULL)
  85                         return buf;
  86
  87                 bufsiz = nbufsiz;
  88         }
  89
  90         *len = (ptr - buf) + 1;
  91         return buf;
  92 }
  93
  94 #endif