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Index: m4/strndup.m4
===================================================================
--- /dev/null 2014-07-29 08:00:54.000000000 -0700
+++ m4/strndup.m4 2014-07-29 08:01:42.499328796 -0700
@@ -0,0 +1,51 @@
+# strndup.m4 serial 21
+dnl Copyright (C) 2002-2003, 2005-2013 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([cf3_FUNC_STRNDUP],
+[
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+ AC_CHECK_DECLS([strndup])
+ AC_REPLACE_FUNCS([strndup])
+ if test $ac_cv_have_decl_strndup = no; then
+ HAVE_DECL_STRNDUP=0
+ fi
+
+ if test $ac_cv_func_strndup = yes; then
+ HAVE_STRNDUP=1
+ # AIX 5.3 has a function that tries to copy the entire range specified
+ # by n, instead of just the length of src.
+ AC_CACHE_CHECK([for working strndup], [cf3_cv_func_strndup_works],
+ [AC_RUN_IFELSE([
+ AC_LANG_PROGRAM([[#include <string.h>
+ #include <stdlib.h>]], [[
+#if !HAVE_DECL_STRNDUP
+ extern
+ #ifdef __cplusplus
+ "C"
+ #endif
+ char *strndup (const char *, size_t);
+#endif
+ char *s;
+ // Will crash if strndup tries to traverse all 2GB.
+ s = strndup ("string", 2000000000);
+ return 0;]])],
+ [cf3_cv_func_strndup_works=yes],
+ [cf3_cv_func_strndup_works=no],
+ [
+changequote(,)dnl
+ case $host_os in
+ aix | aix[3-6]*) cf3_cv_func_strndup_works="guessing no";;
+ *) cf3_cv_func_strndup_works="guessing yes";;
+ esac
+changequote([,])dnl
+ ])])
+ case $cf3_cv_func_strndup_works in
+ *no) AC_LIBOBJ([strndup]) ;;
+ esac
+ else
+ HAVE_STRNDUP=0
+ fi
+])
|
