+dnl Check for a scanf that understands about %as as format specifier
+
+AC_DEFUN(tinc_SCANF_AS,
+[
+ AC_CACHE_CHECK([for a scanf that groks %as], tinc_cv_scanf_as,
+ [
+ AC_TRY_RUN([
+/* Very naive program which will probably give a segmentation
+ fault if the sscanf doesn't work as expected. */
+#include <stdio.h>
+int main() {
+ char*s = NULL;
+ sscanf("string\n", "%as\n", &s);
+ if(s == NULL)
+ return 1;
+ return strcmp("string", s);
+}
+ ], [tinc_cv_scanf_as="yes"], [tinc_cv_scanf_as="no"])
+ ])
+
+if test "$tinc_cv_scanf_as" = "yes" ; then
+ AC_DEFINE(HAVE_SCANF_AS)
+ AC_SUBST(HAVE_SCANF_AS)
+fi
+])