Oh my jod

libXmd/include/Xmd/Buffer.h

@@ -9,14 +9,26 @@
    variable length strings and files. */
 typedef struct _XmdBuffer XmdBuffer;
 
-/* XmdBufferNew creates a new buffer with the specified element size. */
-XmdBuffer *XmdBufferNew (Cardinal size);
+/* XmdBufferNew creates a new buffer that contains the specified type. */
+#define XmdBufferNew(type) _XmdBufferNew(sizeof(type));
+XmdBuffer *_XmdBufferNew (Cardinal size);
 
 /* XmdBufferPush adds a new element to the buffer. */
 void XmdBufferPush (XmdBuffer *buffer, void *element);
 
+/* XmdBufferPop copies the last element into element, and removes it from the
+   buffer. */
+void XmdBufferPop (XmdBuffer *buffer, void *element);
+
+/* XmdBufferPoke sets a single element of the buffer. */
+void XmdBufferPoke (XmdBuffer *buffer, Cardinal index, void *element);
+
+/* XmdBufferPeek copies the value of a single element of the buffer into
+   element.  */
+void XmdBufferPeek (XmdBuffer *buffer, Cardinal index, void *element);
+
 /* XmdBufferBreak frees the buffer without freeing its data. Its data is
-   returned and must be freed manually at some point. */
+   returned and must be freed manually using XtFree() at some point. */
 void *XmdBufferBreak (XmdBuffer *buffer);
 
 /* XmdBufferFree frees the buffer and any data associated with it. */

libXmd/src/Buffer.c

@@ -16,12 +16,19 @@ static void  XmdBufferResize (XmdBuffer *buffer, Cardinal length);
 static void  XmdBufferFit    (XmdBuffer *buffer);
 static void *XmdBufferOffset (XmdBuffer *buffer, Cardinal index);
 
-XmdBuffer *XmdBufferNew (Cardinal size) {
+XmdBuffer *_XmdBufferNew (Cardinal size) {
 	XmdBuffer *buffer = XtNew(XmdBuffer);
+	if (buffer == NULL) return NULL;
+	
 	buffer->size     = size;
 	buffer->length   = 0;
 	buffer->capacity = XmdBUFFER_INITIAL_CAPACITY;
 	buffer->data     = XtCalloc(buffer->capacity, buffer->size);
+	if (buffer->data == NULL) {
+		XmdBufferFree(buffer);
+		return NULL;
+	}
+	
 	XmdBufferFit(buffer);
 	return buffer;
 }
@@ -46,11 +53,34 @@ void *XmdBufferOffset (XmdBuffer *buffer, Cardinal index) {
 }
 
 void XmdBufferPush (XmdBuffer *buffer, void *element) {
+	Cardinal index = buffer->length;
 	XmdBufferResize(buffer, buffer->length + 1);
+	XmdBufferPoke(buffer, index, element);
+}
+
+void XmdBufferPop (XmdBuffer *buffer, void *element) {
+	Cardinal index = buffer->length - 1;
+	XmdBufferPeek(buffer, index, element);
+	XmdBufferResize(buffer, index);
+}
+
+void XmdBufferPoke (XmdBuffer *buffer, Cardinal index, void *element) {
+	if (index > buffer->length) return;
 	memcpy (
-		XmdBufferOffset(buffer, buffer->length - 1),
+		XmdBufferOffset(buffer, index),
 		element,
 		buffer->size);
+	
+	char test;
+	XmdBufferPeek(buffer, index, &test);
+}
+
+void XmdBufferPeek (XmdBuffer *buffer, Cardinal index, void *element) {
+	if (index > buffer->length) return;
+	memcpy (
+		element,
+		XmdBufferOffset(buffer, index),
+		buffer->size);
 }
 
 void *XmdBufferBreak (XmdBuffer *buffer) {
@@ -60,6 +90,8 @@ void *XmdBufferBreak (XmdBuffer *buffer) {
 }
 
 void XmdBufferFree (XmdBuffer *buffer) {
-	XtFree(buffer->data);
+	if (buffer->data != NULL) {
+		XtFree(buffer->data);
+	}
 	XtFree((char *)(buffer));
 }