X11 implementation of clipboard pasting.

src/x11_clipboard.c

@@ -29,28 +29,131 @@
 
 #include "internal.h"
 
+#include <stdio.h>
 #include <limits.h>
 #include <string.h>
-
+#include <stdlib.h>
 
 //////////////////////////////////////////////////////////////////////////
 //////                       GLFW platform API                      //////
 //////////////////////////////////////////////////////////////////////////
 
+//========================================================================
+// Get the corresponding X11 format for a given GLFW format.
+//========================================================================
+
+static Atom *getInternalFormat(int fmt)
+{
+    // Get the necessary atoms
+    
+    switch (fmt)
+    {
+        case GLFW_CLIPBOARD_FORMAT_STRING:
+            return _glfwLibrary.X11.selection.stringatoms;
+        default:
+            return 0;
+    }
+}
+
 //========================================================================
 // Set the clipboard contents
 //========================================================================
 
 void _glfwPlatformSetClipboardData(void *data, size_t size, int format)
 {
+
 }
 
 //========================================================================
 // Return the current clipboard contents
+// TODO: Incremental support? Overkill perhaps.
 //========================================================================
 
 size_t _glfwPlatformGetClipboardData(void *data, size_t size, int format)
 {
-	return 0;
+    size_t len, rembytes, dummy;
+    unsigned char *d;
+    int fmt;
+    Window window;
+    Atom *xfmt, type;
+
+    // Try different formats that relate to the GLFW format with preference
+    // for better formats first
+    for (xfmt = getInternalFormat(format); *xfmt; xfmt++)
+    {
+        // Specify the format we would like.
+        _glfwLibrary.X11.selection.request = *xfmt;
+
+        // Convert the selection into a format we would like.
+        window = _glfwLibrary.activeWindow->X11.handle;
+        XConvertSelection(_glfwLibrary.X11.display, XA_PRIMARY,
+            *xfmt, None, window,
+            CurrentTime);
+        XFlush(_glfwLibrary.X11.display);
+
+        // Process pending events until we get a SelectionNotify.
+        while (!_glfwLibrary.X11.selection.converted)
+            _glfwPlatformWaitEvents();
+
+        // If there is no owner to the selection/wrong request, bail out.
+        if (_glfwLibrary.X11.selection.converted == 2)
+        {
+            _glfwLibrary.X11.selection.converted = 0;
+            _glfwSetError(GLFW_CLIPBOARD_FORMAT_UNAVAILABLE,
+                          "X11/GLX: Unavailable clipboard format");
+            return 0;
+        }
+        else // Right format, stop checking
+        {
+            _glfwLibrary.X11.selection.converted = 0;
+            break;
+        }
+    }
+
+    // Reset for the next selection
+    _glfwLibrary.X11.selection.converted = 0;
+
+    // Check the length of data to receive
+    XGetWindowProperty(_glfwLibrary.X11.display,
+                       window,
+                       *xfmt,
+                       0, 0,
+                       0,
+                       AnyPropertyType,
+                       &type,
+                       &fmt,
+                       &len, &rembytes,
+                       &d);
+
+    // The number of bytes remaining (which is all of them)
+    if (rembytes > 0)
+    {
+        int result = XGetWindowProperty(_glfwLibrary.X11.display, window,
+                                    *xfmt, 0, rembytes, 0,
+                                    AnyPropertyType, &type, &fmt,
+                                    &len, &dummy, &d);
+        if (result == Success)
+        {
+            size_t s = size - 1 > rembytes ? rembytes : size - 1;
+            // Copy the data out.
+            memcpy(data, d, s);
+            // Null-terminate strings.
+            if (format == GLFW_CLIPBOARD_FORMAT_STRING)
+            {
+                ((char *)data)[s] = '\0';
+            }
+            // Free the data allocated using X11.
+            XFree(d);
+            // Return the actual number of bytes.
+            return rembytes;
+        }
+        else
+        {
+            // Free the data allocated using X11.
+            XFree(d);
+            return 0;
+        }
+    }
+    return 0;
 }