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  1. /*      $NetBSD: getline.c,v 1.2 2015/12/25 20:12:46 joerg Exp $        */
  2. /*      NetBSD-src: getline.c,v 1.2 2014/09/16 17:23:50 christos Exp    */
  3.  
  4. /*-
  5.  * Copyright (c) 2011 The NetBSD Foundation, Inc.
  6.  * All rights reserved.
  7.  *
  8.  * This code is derived from software contributed to The NetBSD Foundation
  9.  * by Christos Zoulas.
  10.  *
  11.  * Redistribution and use in source and binary forms, with or without
  12.  * modification, are permitted provided that the following conditions
  13.  * are met:
  14.  * 1. Redistributions of source code must retain the above copyright
  15.  *    notice, this list of conditions and the following disclaimer.
  16.  * 2. Redistributions in binary form must reproduce the above copyright
  17.  *    notice, this list of conditions and the following disclaimer in the
  18.  *    documentation and/or other materials provided with the distribution.
  19.  *
  20.  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  21.  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  22.  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  23.  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  24.  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25.  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26.  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27.  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28.  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29.  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  30.  * POSSIBILITY OF SUCH DAMAGE.
  31.  */
  32.  
  33. #include <stdio.h>
  34. #include <stdlib.h>
  35.  
  36. #include "my_getline.h"
  37.  
  38. ssize_t
  39. getdelim(char **buf, size_t *bufsiz, int delimiter, FILE *fp)
  40. {
  41.         char *ptr, *eptr;
  42.  
  43.  
  44.         if (*buf == NULL || *bufsiz == 0) {
  45.                 *bufsiz = BUFSIZ;
  46.                 if ((*buf = malloc(*bufsiz)) == NULL)
  47.                         return -1;
  48.         }
  49.  
  50.         for (ptr = *buf, eptr = *buf + *bufsiz;;) {
  51.                 int c = fgetc(fp);
  52.                 if (c == -1) {
  53.                         if (feof(fp)) {
  54.                                 ssize_t diff = (ssize_t)(ptr - *buf);
  55.                                 if (diff != 0) {
  56.                                         *ptr = '\0';
  57.                                         return diff;
  58.                                 }
  59.                         }
  60.                         return -1;
  61.                 }
  62.                 *ptr++ = c;
  63.                 if (c == delimiter) {
  64.                         *ptr = '\0';
  65.                         return ptr - *buf;
  66.                 }
  67.                 if (ptr + 2 >= eptr) {
  68.                         char *nbuf;
  69.                         size_t nbufsiz = *bufsiz * 2;
  70.                         ssize_t d = ptr - *buf;
  71.                         if ((nbuf = realloc(*buf, nbufsiz)) == NULL)
  72.                                 return -1;
  73.                         *buf = nbuf;
  74.                         *bufsiz = nbufsiz;
  75.                         eptr = nbuf + nbufsiz;
  76.                         ptr = nbuf + d;
  77.                 }
  78.         }
  79. }
  80.  
  81.  
  82. ssize_t
  83. getline(char **buf, size_t *bufsiz, FILE *fp)
  84. {
  85.         return getdelim(buf, bufsiz, '\n', fp);
  86. }
  87.  
  88.