2 dnl Copyright (C) 2002-2003, 2005-2006 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 AC_LIBSOURCES([strndup.c, strndup.h])
11 dnl Persuade glibc <string.h> to declare strndup().
12 AC_REQUIRE([AC_GNU_SOURCE])
14 AC_CHECK_DECLS_ONCE([strndup])
16 # AIX 4.3.3, AIX 5.1 have a function that fails to add the terminating '\0'.
17 AC_CACHE_CHECK([for working strndup], gl_cv_func_strndup,
19 AC_LANG_PROGRAM([#include <string.h>], [[
20 #ifndef HAVE_DECL_STRNDUP
21 extern char *strndup (const char *, size_t);
24 s = strndup ("some longer string", 15);
26 s = strndup ("shorter string", 13);
27 return s[13] != '\0';]])],
28 [gl_cv_func_strndup=yes],
29 [gl_cv_func_strndup=no],
30 [AC_EGREP_CPP([too risky], [
35 [gl_cv_func_strndup=no],
36 [gl_cv_func_strndup=yes])])])
37 if test $gl_cv_func_strndup = yes; then
38 AC_DEFINE([HAVE_STRNDUP], 1,
39 [Define if you have the strndup() function and it works.])
42 AC_DEFINE(strndup, rpl_strndup,
43 [Define to rpl_strndup if the replacement function should be used,])
48 # Prerequisites of lib/strndup.c.
49 AC_DEFUN([gl_PREREQ_STRNDUP], [:])