Start working on c api

src/validate.cpp

@@ -3,6 +3,7 @@
 
 #include "callbacks.h"
 #include "parser3.h"
+#include "weaseljson.h"
 
 int main(int argc, char **argv) {
   if (argc < 2) {
@@ -24,12 +25,12 @@ int main(int argc, char **argv) {
       return 1;
     }
     switch (parser.parse(buf, l)) {
-    case parser3::S_OK:
+    case WeaselJson_OK:
       return 0;
-    case parser3::S_AGAIN:
+    case WeaselJson_AGAIN:
       continue;
-    case parser3::S_REJECT:
-    case parser3::S_OVERFLOW:
+    case WeaselJson_REJECT:
+    case WeaselJson_OVERFLOW:
       return 1;
     }
     if (l == 0) {