2
dnl Copyright (C) 2002-2003, 2005-2009 Free Software Foundation, Inc.
3
dnl This file is free software; the Free Software Foundation
4
dnl gives unlimited permission to copy and/or distribute it,
5
dnl with or without modifications, as long as this notice is preserved.
7
AC_DEFUN([gl_FUNC_STRNDUP],
9
dnl Persuade glibc <string.h> to declare strndup().
10
AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
12
AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
13
AC_CHECK_DECLS_ONCE([strndup])
14
if test $ac_cv_have_decl_strndup = no; then
18
# AIX 4.3.3, AIX 5.1 have a function that fails to add the terminating '\0'.
19
AC_CACHE_CHECK([for working strndup], [gl_cv_func_strndup],
21
AC_LANG_PROGRAM([[#include <string.h>
22
#include <stdlib.h>]], [[
23
#ifndef HAVE_DECL_STRNDUP
24
extern char *strndup (const char *, size_t);
27
s = strndup ("some longer string", 15);
29
s = strndup ("shorter string", 13);
30
return s[13] != '\0';]])],
31
[gl_cv_func_strndup=yes],
32
[gl_cv_func_strndup=no],
33
[AC_CHECK_FUNC([strndup],
34
[AC_EGREP_CPP([too risky], [
39
[gl_cv_func_strndup=no],
40
[gl_cv_func_strndup=yes])],
41
[gl_cv_func_strndup=no])])])
42
if test $gl_cv_func_strndup = yes; then
43
AC_DEFINE([HAVE_STRNDUP], [1],
44
[Define if you have the strndup() function and it works.])
52
# Prerequisites of lib/strndup.c.
53
AC_DEFUN([gl_PREREQ_STRNDUP], [:])