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  1. /*      $NetBSD: fgetln.c,v 1.9 2008/04/29 06:53:03 martin Exp $        */
  2.  
  3. /*-
  4.  * Copyright (c) 2011 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. ///#include "file.h"
  33. #if !HAVE_GETLINE
  34. #include <stdlib.h>
  35. #include <stdio.h>
  36. ///#include <unistd.h>
  37. #include <errno.h>
  38. #include <string.h>
  39.  
  40. typedef int ssize_t;
  41.  
  42.  
  43. ssize_t
  44. getdelim(char **buf, size_t *bufsiz, int delimiter, FILE *fp)
  45. {
  46.         char *ptr, *eptr;
  47.  
  48.  
  49.         if (*buf == NULL || *bufsiz == 0) {
  50.                 *bufsiz = BUFSIZ;
  51.                 if ((*buf = malloc(*bufsiz)) == NULL)
  52.                         return -1;
  53.         }
  54.  
  55.         for (ptr = *buf, eptr = *buf + *bufsiz;;) {
  56.                 int c = fgetc(fp);
  57.                 if (c == -1) {
  58.                         if (feof(fp))
  59.                                 return ptr == *buf ? -1 : ptr - *buf;
  60.                         else
  61.                                 return -1;
  62.                 }
  63.                 *ptr++ = c;
  64.                 if (c == delimiter) {
  65.                         *ptr = '\0';
  66.                         return ptr - *buf;
  67.                 }
  68.                 if (ptr + 2 >= eptr) {
  69.                         char *nbuf;
  70.                         size_t nbufsiz = *bufsiz * 2;
  71.                         ssize_t d = ptr - *buf;
  72.                         if ((nbuf = realloc(*buf, nbufsiz)) == NULL)
  73.                                 return -1;
  74.                         *buf = nbuf;
  75.                         *bufsiz = nbufsiz;
  76.                         eptr = nbuf + nbufsiz;
  77.                         ptr = nbuf + d;
  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. #endif
  89.  
  90. #ifdef TEST
  91. int
  92. main(int argc, char *argv[])
  93. {
  94.         char *p = NULL;
  95.         ssize_t len;
  96.         size_t n = 0;
  97.  
  98.         while ((len = getline(&p, &n, stdin)) != -1)
  99.                 (void)printf("%zd %s", len, p);
  100.         free(p);
  101.         return 0;
  102. }
  103. #endif
  104.