2 dnl Copyright (C) 2002-2003, 2005-2007 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_GNU_SOURCE])
12 AC_CHECK_DECLS_ONCE([strndup])
13 if test $ac_cv_have_decl_strndup = no; then
17 # AIX 4.3.3, AIX 5.1 have a function that fails to add the terminating '\0'.
18 AC_CACHE_CHECK([for working strndup], gl_cv_func_strndup,
20 AC_LANG_PROGRAM([#include <string.h>
21 #include <stdlib.h>], [[
22 #ifndef HAVE_DECL_STRNDUP
23 extern char *strndup (const char *, size_t);
26 s = strndup ("some longer string", 15);
28 s = strndup ("shorter string", 13);
29 return s[13] != '\0';]])],
30 [gl_cv_func_strndup=yes],
31 [gl_cv_func_strndup=no],
32 [AC_CHECK_FUNC([strndup],
33 [AC_EGREP_CPP([too risky], [
38 [gl_cv_func_strndup=no],
39 [gl_cv_func_strndup=yes])],
40 [gl_cv_func_strndup=no])])])
41 if test $gl_cv_func_strndup = yes; then
42 AC_DEFINE([HAVE_STRNDUP], 1,
43 [Define if you have the strndup() function and it works.])
51 # Prerequisites of lib/strndup.c.
52 AC_DEFUN([gl_PREREQ_STRNDUP], [:])