external/bsd/mdocml/dist/compat_fgetln.c

   1 #ifdef HAVE_CONFIG_H
   2 #include "config.h"
   3 #endif
   4
   5 #ifdef HAVE_FGETLN
   6
   7 int dummy;
   8
   9 #else
  10
  11 /*      $NetBSD: compat_fgetln.c,v 1.2 2012/01/30 17:03:01 joerg Exp $  */
  12
  13 /*-
  14  * Copyright (c) 1998 The NetBSD Foundation, Inc.
  15  * All rights reserved.
  16  *
  17  * This code is derived from software contributed to The NetBSD Foundation
  18  * by Christos Zoulas.
  19  *
  20  * Redistribution and use in source and binary forms, with or without
  21  * modification, are permitted provided that the following conditions
  22  * are met:
  23  * 1. Redistributions of source code must retain the above copyright
  24  *    notice, this list of conditions and the following disclaimer.
  25  * 2. Redistributions in binary form must reproduce the above copyright
  26  *    notice, this list of conditions and the following disclaimer in the
  27  *    documentation and/or other materials provided with the distribution.
  28  * 3. Neither the name of The NetBSD Foundation nor the names of its
  29  *    contributors may be used to endorse or promote products derived
  30  *    from this software without specific prior written permission.
  31  *
  32  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  33  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  34  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  35  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  36  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  37  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  38  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  39  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  40  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  41  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  42  * POSSIBILITY OF SUCH DAMAGE.
  43  */
  44 #include <errno.h>
  45 #include <stdio.h>
  46 #include <stdlib.h>
  47 #include <string.h>
  48
  49 char *
  50 fgetln(fp, len)
  51         FILE *fp;
  52         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