source: lib/strndup.c @ 823d8e1

cachetimestampsdeveloprc-4.0.4ringdecrementfixringperformance
Last change on this file since 823d8e1 was 823d8e1, checked in by Alistair King <alistair@…>, 2 years ago

Replace AC_CHECK_FUNCS with AC_CHECK_DECLS

It seems that AC_CHECK_FUNCS does not correctly detect when these "functions" are implemented as macros. (I've seen this happening on macOS, and Ubuntu 16.04 with snprintf and strndup respectively.) Replacing AC_CHECK_FUNCS (and the similar AC_REPLACE_FUNCS) with AC_CHECK_DECLS seems to solve this problem, though I don't have access to any systems that do not have these functions to be sure that it correctly detects them as missing.

  • Property mode set to 100644
File size: 1.7 KB
Line 
1/*
2 *
3 * Copyright (c) 2007-2016 The University of Waikato, Hamilton, New Zealand.
4 * All rights reserved.
5 *
6 * This file is part of libtrace.
7 *
8 * This code has been developed by the University of Waikato WAND
9 * research group. For further information please see http://www.wand.net.nz/
10 *
11 * libtrace is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU Lesser General Public License as published by
13 * the Free Software Foundation; either version 3 of the License, or
14 * (at your option) any later version.
15 *
16 * libtrace is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19 * GNU Lesser General Public License for more details.
20 *
21 * You should have received a copy of the GNU Lesser General Public License
22 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
23 *
24 *
25 */
26#include "config.h"
27#if !HAVE_DECL_STRNDUP
28
29#include <stdlib.h>
30#include <errno.h>
31#include <string.h>
32
33#include <libtrace_int.h>
34
35/* Some systems don't include strndup as part of their standard C library, so
36 * we need to provide our own version.
37 *
38 * Full credit to Matthew Luckie, who wrote this particular version and allowed
39 * us to borrow it.
40 */
41
42char *strndup(const char *s, size_t size)
43{
44  char   *str;
45  size_t  len;
46
47  if(size == 0 || s == NULL)
48    {
49      errno = EINVAL;
50      return NULL;
51    }
52
53  if(size > (len = strlen(s)))
54    {
55      size = len+1;
56    }
57
58  if((str = malloc(size)) == NULL)
59    {
60      errno = ENOMEM;
61      return NULL;
62    }
63
64  memcpy(str, s, size);
65  str[size-1] = '\0';
66
67  return str;
68}
69
70#endif
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