LibC: Implement iswctype

Userland/Libraries/LibC/wctype.cpp

@@ -92,10 +92,48 @@ int iswblank(wint_t wc)
     return __inline_isblank(wc);
 }
 
-int iswctype(wint_t, wctype_t)
+int iswctype(wint_t wc, wctype_t charclass)
 {
-    dbgln("FIXME: Implement iswctype()");
-    TODO();
+    switch (charclass) {
+    case WCTYPE_ALNUM:
+        return iswalnum(wc);
+
+    case WCTYPE_ALPHA:
+        return iswalpha(wc);
+
+    case WCTYPE_BLANK:
+        return iswblank(wc);
+
+    case WCTYPE_CNTRL:
+        return iswcntrl(wc);
+
+    case WCTYPE_DIGIT:
+        return iswdigit(wc);
+
+    case WCTYPE_GRAPH:
+        return iswgraph(wc);
+
+    case WCTYPE_LOWER:
+        return iswlower(wc);
+
+    case WCTYPE_PRINT:
+        return iswprint(wc);
+
+    case WCTYPE_PUNCT:
+        return iswpunct(wc);
+
+    case WCTYPE_SPACE:
+        return iswspace(wc);
+
+    case WCTYPE_UPPER:
+        return iswupper(wc);
+
+    case WCTYPE_XDIGIT:
+        return iswxdigit(wc);
+
+    default:
+        return 0;
+    }
 }
 
 wctype_t wctype(const char* property)