Ensure out arguments are always set.

src/input.c

@@ -319,11 +319,15 @@ GLFWAPI void glfwGetCursorPos(GLFWwindow* handle, double* xpos, double* ypos)
 {
     _GLFWwindow* window = (_GLFWwindow*) handle;
 
+    if (xpos)
+        *xpos = 0;
+    if (ypos)
+        *ypos = 0;
+
     _GLFW_REQUIRE_INIT();
 
     if (xpos)
         *xpos = window->cursorPosX;
-
     if (ypos)
         *ypos = window->cursorPosY;
 }

src/monitor.c

@@ -295,7 +295,14 @@ GLFWAPI GLFWmonitor* glfwGetPrimaryMonitor(void)
 GLFWAPI void glfwGetMonitorPos(GLFWmonitor* handle, int* xpos, int* ypos)
 {
     _GLFWmonitor* monitor = (_GLFWmonitor*) handle;
+
+    if (xpos)
+        *xpos = 0;
+    if (ypos)
+        *ypos = 0;
+
     _GLFW_REQUIRE_INIT();
+
     _glfwPlatformGetMonitorPos(monitor, xpos, ypos);
 }
 
@@ -303,6 +310,11 @@ GLFWAPI void glfwGetMonitorPhysicalSize(GLFWmonitor* handle, int* width, int* he
 {
     _GLFWmonitor* monitor = (_GLFWmonitor*) handle;
 
+    if (width)
+        *width = 0;
+    if (height)
+        height = 0;
+
     _GLFW_REQUIRE_INIT();
 
     if (width)

src/window.c

@@ -434,6 +434,12 @@ GLFWAPI void glfwSetWindowTitle(GLFWwindow* handle, const char* title)
 GLFWAPI void glfwGetWindowPos(GLFWwindow* handle, int* xpos, int* ypos)
 {
     _GLFWwindow* window = (_GLFWwindow*) handle;
+
+    if (xpos)
+        *xpos = 0;
+    if (ypos)
+        *ypos = 0;
+
     _GLFW_REQUIRE_INIT();
     _glfwPlatformGetWindowPos(window, xpos, ypos);
 }
@@ -457,6 +463,12 @@ GLFWAPI void glfwSetWindowPos(GLFWwindow* handle, int xpos, int ypos)
 GLFWAPI void glfwGetWindowSize(GLFWwindow* handle, int* width, int* height)
 {
     _GLFWwindow* window = (_GLFWwindow*) handle;
+
+    if (width)
+        *width = 0;
+    if (height)
+        *height = 0;
+
     _GLFW_REQUIRE_INIT();
     _glfwPlatformGetWindowSize(window, width, height);
 }
@@ -483,8 +495,12 @@ GLFWAPI void glfwGetFramebufferSize(GLFWwindow* handle, int* width, int* height)
 {
     _GLFWwindow* window = (_GLFWwindow*) handle;
 
-    _GLFW_REQUIRE_INIT();
+    if (width)
+        *width = 0;
+    if (height)
+        *height = 0;
 
+    _GLFW_REQUIRE_INIT();
     _glfwPlatformGetFramebufferSize(window, width, height);
 }
 
@@ -493,6 +509,16 @@ GLFWAPI void glfwGetWindowFrameSize(GLFWwindow* handle,
                                     int* right, int* bottom)
 {
     _GLFWwindow* window = (_GLFWwindow*) handle;
+
+    if (left)
+        *left = 0;
+    if (top)
+        *top = 0;
+    if (right)
+        *right = 0;
+    if (bottom)
+        *bottom = 0;
+
     _GLFW_REQUIRE_INIT();
     _glfwPlatformGetWindowFrameSize(window, left, top, right, bottom);
 }

src/x11_window.c

@@ -1280,15 +1280,6 @@ void _glfwPlatformGetWindowFrameSize(_GLFWwindow* window,
 {
     long* extents = NULL;
 
-    if (left)
-        *left = 0;
-    if (top)
-        *top = 0;
-    if (right)
-        *right = 0;
-    if (bottom)
-        *bottom = 0;
-
     if (_glfw.x11.NET_FRAME_EXTENTS == None)
         return;