src/ext/getdelim.c

   1 /*      $NetBSD: getdelim.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 #ifndef BUFSIZ
  34 #define BUFSIZ 512
  35 #endif
  36
  37 ssize_t
  38 compat_getdelim_(char **buf, size_t *bufsiz, int delimiter, FILE *fp)
  39 {
  40         char *ptr, *eptr;
  41
  42
  43         if (*buf == NULL || *bufsiz == 0) {
  44                 *bufsiz = BUFSIZ;
  45                 if ((*buf = raw_malloc(*bufsiz)) == NULL)
  46                         return -1;
  47         }
  48
  49         for (ptr = *buf, eptr = *buf + *bufsiz;;) {
  50                 int c = fgetc(fp);
  51                 if (c == -1) {
  52                         if (feof(fp)) {
  53                                 ssize_t diff = (ssize_t)(ptr - *buf);
  54                                 if (diff != 0) {
  55                                         *ptr = '\0';
  56                                         return diff;
  57                                 }
  58                         }
  59                         return -1;
  60                 }
  61                 *ptr++ = c;
  62                 if (c == delimiter) {
  63                         *ptr = '\0';
  64                         return ptr - *buf;
  65                 }
  66                 if (ptr + 2 >= eptr) {
  67                         char *nbuf;
  68                         size_t nbufsiz = *bufsiz * 2;
  69                         ssize_t d = ptr - *buf;
  70                         if (nbufsiz < *bufsiz ||
  71                             (nbuf = raw_realloc(*buf, nbufsiz)) == NULL)
  72                                 return -1;
  73                         *buf = nbuf;
  74                         *bufsiz = nbufsiz;
  75                         eptr = nbuf + nbufsiz;
  76                         ptr = nbuf + d;
  77                 }
  78         }
  79 }