update extconf.rb and config.h with discount 2.x defines

ext/config.h

@@ -1,10 +1,13 @@
+/*
+ * rdiscount extension discount configuration
+ */
+#ifndef __MARKDOWN_D
+#define __MARKDOWN_D 1
 
-/* rdiscount extension configuration */
-
-#undef USE_AMALLOC
-
+/* tabs are four spaces */
 #define TABSTOP 4
 
+/* these are setup by extconf.rb */
 #if HAVE_RANDOM
 #define COINTOSS() (random()&1)
 #elif HAVE_RAND
@@ -17,5 +20,4 @@
 #define INITRNG(x) srand((unsigned int)x)
 #endif
 
-#define RELAXED_EMPHASIS 1
-#define SUPERSCRIPT 1
+#endif/* __MARKDOWN_D */

ext/extconf.rb

@@ -7,4 +7,17 @@
 HAVE_RAND = have_func('rand')
 HAVE_SRAND = have_func('srand')
 
+def sized_int(size, types)
+  types.find { |type| check_sizeof(type) == 4 } ||
+    abort("no int with size #{size}")
+end
+
+DWORD = sized_int(4, ["unsigned long", "unsigned int"])
+WORD =  sized_int(2, ["unsigned int", "unsigned short"])
+BYTE = "unsigned char"
+
+$defs.push("-DDWORD='#{DWORD}'")
+$defs.push("-DWORD='#{WORD}'")
+$defs.push("-DBYTE='#{BYTE}'")
+
 create_makefile('rdiscount')