tools/compat/fgetln.c

   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 <stdlib.h>
  38 #ifndef HAVE_NBTOOL_CONFIG_H
  39 /* These headers are required, but included from nbtool_config.h */
  40 #include <stdio.h>
  41 #include <unistd.h>
  42 #include <errno.h>
  43 #include <string.h>
  44 #endif
  45
  46 char *
  47 fgetln(FILE *fp, size_t *len)
  48 {
  49         static char *buf = NULL;
  50         static size_t bufsiz = 0;
  51         char *ptr;
  52
  53
  54         if (buf == NULL) {
  55                 bufsiz = BUFSIZ;
  56                 if ((buf = malloc(bufsiz)) == NULL)
  57                         return NULL;
  58         }
  59
  60         if (fgets(buf, bufsiz, fp) == NULL)
  61                 return NULL;
  62
  63         *len = 0;
  64         while ((ptr = strchr(&buf[*len], '\n')) == NULL) {
  65                 size_t nbufsiz = bufsiz + BUFSIZ;
  66                 char *nbuf = realloc(buf, nbufsiz);
  67
  68                 if (nbuf == NULL) {
  69                         int oerrno = errno;
  70                         free(buf);
  71                         errno = oerrno;
  72                         buf = NULL;
  73                         return NULL;
  74                 } else
  75                         buf = nbuf;
  76
  77                 if (fgets(&buf[bufsiz], BUFSIZ, fp) == NULL) {
  78                         buf[bufsiz] = '\0';
  79                         *len = strlen(buf);
  80                         return buf;
  81                 }
  82
  83                 *len = bufsiz;
  84                 bufsiz = nbufsiz;
  85         }
  86
  87         *len = (ptr - buf) + 1;
  88         return buf;
  89 }
  90
  91 #endif
  92
  93 #ifdef TEST
  94 int
  95 main(int argc, char *argv[])
  96 {
  97         char *p;
  98         size_t len;
  99
 100         while ((p = fgetln(stdin, &len)) != NULL) {
 101                 (void)printf("%zu %s", len, p);
 102                 free(p);
 103         }
 104         return 0;
 105 }
 106 #endif