Added more robust debugger logging to the Windows backend, PROPERLY this time.

redo/windows/GNUmakeinc.mk

@@ -15,6 +15,7 @@ osCFILES = \
 	windows/group.c \
 	windows/init.c \
 	windows/label.c \
+	windows/logging.c \
 	windows/main.c \
 	windows/menu.c \
 	windows/parent.c \

redo/windows/logging.c

@@ -0,0 +1,58 @@
+// 9 june 2015
+#include "uipriv_windows.h"
+
+// We can't use the private heap for these functions, since they are allowed to be run before uiInit() or after uiUninit().
+
+static void nomemlog(void)
+{
+	OutputDebugStringW(L"[libui] memory exhausted logging message");
+	DebugBreak();
+	abort();			// just in case
+}
+
+void uiLog(const char *format, ...)
+{
+	va_list ap;
+
+	va_start(ap, format);
+	uiLogv(format, ap);
+	va_end(ap);
+}
+
+void uiLogv(const char *format, va_list ap)
+{
+	va_list ap2;
+	int n;
+	char *buf;
+
+	va_copy(ap2, ap);
+	n = _vscprintf(format, ap2);
+	va_end(ap2);
+	// "[libui] message\0" == (8 + n + 1)
+	buf = (char *) malloc((8 + n + 1)
+	if (buf == NULL)
+		nomemlog();
+	buf[0] = '[';
+	buf[1] = 'l';
+	buf[2] = 'i';
+	buf[3] = 'b';
+	buf[4] = 'u';
+	buf[5] = 'i';
+	buf[6] = ']';
+	buf[7] = ' ';
+	vsnprintf_s(buf + 8, n + 1, n, format, ap);
+	// breaking the rules: we can't reliably tell that the encoding of debugging messages is UTF-8 like we could with everything else :/
+	OutputDebugStringA(buf);
+	free(buf);
+}
+
+void complain(const char *format, ...)
+{
+	va_list ap;
+
+	va_start(ap, format);
+	uiLogv(format, av);
+	va_end(ap);
+	DebugBreak();
+	abort();		// just in case
+}

redo/windows/util.c

@@ -34,19 +34,6 @@ int windowClassOf(HWND hwnd, ...)
 	return -1;
 }
 
-void complain(const char *fmt, ...)
-{
-	va_list ap;
-
-	va_start(ap, fmt);
-	fprintf(stderr, "[libui] ");
-	vfprintf(stderr, fmt, ap);
-	fprintf(stderr, "\n");
-	va_end(ap);
-	DebugBreak();
-	abort();		// just in case
-}
-
 // wrapper around MapWindowRect() that handles the complex error handling
 void mapWindowRect(HWND from, HWND to, RECT *r)
 {