Fix the lack of isblank() with VMS C
#include <ctype.h>
#include <stdio.h>
+/*
+ * Even though the VMS C RTL claims to be C99 compatible, it's not entirely
+ * so far (C RTL version 8.4). For the sake of these tests, we therefore
+ * define our own.
+ */
+#if defined(__VMS) && __CRTL_VER <= 80400000
+static int isblank(int c)
+{
+ return c == ' ' || c == '\t';
+}
+#endif
+
static int test_ctype_chars(int n)
{
return TEST_int_eq(isalnum(n) != 0, ossl_isalnum(n) != 0)
