First Commit

libui-ng/darwin/undocumented.m

@@ -0,0 +1,31 @@
+// 3 november 2017
+#import "uipriv_darwin.h"
+
+// functions and constants FROM THE DEPTHS BELOW!
+// note: for constants, dlsym() returns the address of the constant itself, as if we had done &constantName
+// we also provide default values just in case
+
+// these values come from 10.12.6
+CFStringRef uiprivUNDOC_kCTFontPreferredSubFamilyNameKey = CFSTR("CTFontPreferredSubFamilyName");
+CFStringRef uiprivUNDOC_kCTFontPreferredFamilyNameKey = CFSTR("CTFontPreferredFamilyName");
+
+// note that we treat any error as "the symbols aren't there" (and don't care if dlclose() failed)
+void uiprivLoadUndocumented(void)
+{
+	void *handle;
+	CFStringRef *str;
+
+	// dlsym() walks the dependency chain, so opening the current process should be sufficient
+	handle = dlopen(NULL, RTLD_LAZY);
+	if (handle == NULL)
+		return;
+#define GET(var, fn) *((void **) (&var)) = dlsym(handle, #fn)
+	GET(str, kCTFontPreferredSubFamilyNameKey);
+NSLog(@"get %p", str);
+	if (str != NULL)
+		uiprivUNDOC_kCTFontPreferredSubFamilyNameKey = *str;
+	GET(str, kCTFontPreferredFamilyNameKey);
+	if (str != NULL)
+		uiprivUNDOC_kCTFontPreferredFamilyNameKey = *str;
+	dlclose(handle);
+}