-# strndup.m4 serial 3
-dnl Copyright (C) 2002, 2003 Free Software Foundation, Inc.
+# strndup.m4 serial 18
+dnl Copyright (C) 2002-2003, 2005-2010 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
AC_DEFUN([gl_FUNC_STRNDUP],
[
dnl Persuade glibc <string.h> to declare strndup().
- AC_REQUIRE([AC_GNU_SOURCE])
+ AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
- AC_REPLACE_FUNCS(strndup)
- if test $ac_cv_func_strndup = no; then
- gl_PREREQ_STRNDUP
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+ AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
+ AC_CHECK_DECLS_ONCE([strndup])
+ AC_CHECK_FUNCS_ONCE([strndup])
+ if test $ac_cv_have_decl_strndup = no; then
+ HAVE_DECL_STRNDUP=0
fi
-])
-# Prerequisites of lib/strndup.c.
-AC_DEFUN([gl_PREREQ_STRNDUP], [
- AC_CHECK_DECLS(strnlen)
+ if test $ac_cv_func_strndup = yes; then
+ # AIX 4.3.3, AIX 5.1 have a function that fails to add the terminating '\0'.
+ AC_CACHE_CHECK([for working strndup], [gl_cv_func_strndup_works],
+ [AC_RUN_IFELSE([
+ AC_LANG_PROGRAM([[#include <string.h>
+ #include <stdlib.h>]], [[
+#ifndef HAVE_DECL_STRNDUP
+ extern char *strndup (const char *, size_t);
+#endif
+ char *s;
+ s = strndup ("some longer string", 15);
+ free (s);
+ s = strndup ("shorter string", 13);
+ return s[13] != '\0';]])],
+ [gl_cv_func_strndup_works=yes],
+ [gl_cv_func_strndup_works=no],
+ [
+changequote(,)dnl
+ case $host_os in
+ aix | aix[3-6]*) gl_cv_func_strndup_works="guessing no";;
+ *) gl_cv_func_strndup_works="guessing yes";;
+ esac
+changequote([,])dnl
+ ])])
+ case $gl_cv_func_strndup_works in
+ *no)
+ REPLACE_STRNDUP=1
+ AC_LIBOBJ([strndup])
+ ;;
+ esac
+ else
+ AC_LIBOBJ([strndup])
+ fi
])