X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;ds=sidebyside;f=m4%2Fstrnlen.m4;h=52bb838f96b9eac3f2f782dbc6b1b918d85b5cdf;hb=423d3cac13c30bb0d5f85e5fac6ab1406ed1731a;hp=a5bd2ef0075bd3b4f79f4501041980fe5be36c6f;hpb=f4b7f14292df9fe59509a5a1aa996cc26e2607fc;p=gnulib.git

diff --git a/m4/strnlen.m4 b/m4/strnlen.m4
index a5bd2ef00..52bb838f9 100644
--- a/m4/strnlen.m4
+++ b/m4/strnlen.m4
@@ -1,31 +1,32 @@
-#serial 1
+# strnlen.m4 serial 12
+dnl Copyright (C) 2002-2003, 2005-2007, 2009-2010 Free Software Foundation,
+dnl 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.
 
-# This is already in cvs autoconf -- what will be 2.52g.
-# Define it here for those who aren't on the bleeding edge.
-# FIXME: remove this file once the next autoconf release comes out.
+AC_DEFUN([gl_FUNC_STRNLEN],
+[
+  AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
 
-undefine([AC_FUNC_STRNLEN])
+  dnl Persuade glibc <string.h> to declare strnlen().
+  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
 
-# AC_FUNC_STRNLEN
-# --------------
-AC_DEFUN([AC_FUNC_STRNLEN],
-[AC_CACHE_CHECK([for working strnlen], ac_cv_func_strnlen_working,
-[AC_RUN_IFELSE([AC_LANG_PROGRAM([], [[
-#define S "foobar"
-#define S_LEN (sizeof S - 1)
+  AC_CHECK_DECLS_ONCE([strnlen])
+  if test $ac_cv_have_decl_strnlen = no; then
+    HAVE_DECL_STRNLEN=0
+  else
+    AC_FUNC_STRNLEN
+    dnl Note: AC_FUNC_STRNLEN does AC_LIBOBJ([strnlen]).
+    if test $ac_cv_func_strnlen_working = no; then
+      REPLACE_STRNLEN=1
+    fi
+  fi
+  if test $HAVE_DECL_STRNLEN = 0 || test $REPLACE_STRNLEN = 1; then
+    AC_LIBOBJ([strnlen])
+    gl_PREREQ_STRNLEN
+  fi
+])
 
-  /* At least one implementation is buggy: that of AIX 4.3.  */
-  int i;
-  for (i = 0; i < S_LEN + 1; ++i)
-    {
-      int result = i <= S_LEN ? i : S_LEN;
-      if (strnlen (S, i) != result)
-	exit (1);
-    }
-  exit (0);
-]])],
-               [ac_cv_func_strnlen_working=yes],
-               [ac_cv_func_strnlen_working=no],
-               [ac_cv_func_strnlen_working=no])])
-test $ac_cv_func_strnlen_working = no && AC_LIBOBJ([strnlen])
-])# AC_FUNC_STRNLEN
+# Prerequisites of lib/strnlen.c.
+AC_DEFUN([gl_PREREQ_STRNLEN], [:])