Add some buffer management routines

libXmd/src/Buffer.c

@@ -0,0 +1,61 @@
+#include <Xmd/Buffer.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define XmdBUFFER_GROWTH_FACTOR 2
+
+struct _XmdBuffer {
+	void * data;
+	size_t element;
+	size_t length;
+	size_t capacity;
+};
+
+static void  XmdBufferResize (XmdBuffer *buffer, size_t length);
+static void  XmdBufferFit    (XmdBuffer *buffer);
+static void *XmdBufferOffset (XmdBuffer *buffer, size_t index);
+
+XmdBuffer *XmdBufferNew (size_t element) {
+	XmdBuffer *buffer = calloc(1, sizeof(XmdBuffer));
+	buffer->element  = element;
+	buffer->capacity = 1;
+	XmdBufferFit(buffer);
+	return buffer;
+}
+
+void XmdBufferResize (XmdBuffer *buffer, size_t length) {
+	buffer->length = length;
+	XmdBufferFit(buffer);
+}
+
+void XmdBufferFit (XmdBuffer *buffer) {
+	if (buffer->length > buffer->capacity) {
+		buffer->capacity *= XmdBUFFER_GROWTH_FACTOR;
+		buffer->data = realloc (
+			buffer->data,
+			buffer->capacity * buffer->element);
+	}
+}
+
+void *XmdBufferOffset (XmdBuffer *buffer, size_t index) {
+	return buffer->data + (index * buffer->element);
+}
+
+void XmdBufferPush (XmdBuffer *buffer, void *element) {
+	XmdBufferResize(buffer, buffer->length + 1);
+	memcpy (
+		XmdBufferOffset(buffer, buffer->length - 1),
+		element,
+		buffer->element);
+}
+
+void *XmdBufferBreak (XmdBuffer *buffer) {
+	void *data = buffer->data;
+	free(buffer);
+	return data;
+}
+
+void XmdBufferFree (XmdBuffer *buffer) {
+	free(buffer->data);
+	free(buffer);
+}

libXmd/src/Icon.c

@@ -0,0 +1,37 @@
+#include <Xmd/Icon.h>
+
+Pixmap _XmdLoadBitmapIcon (Widget widget, unsigned char *bits, int width, int height) {
+	Pixel fg, bg;
+	XtVaGetValues (widget,
+    		XmNforeground, &fg,
+		XmNbackground, &bg, 
+		NULL);
+	return XCreatePixmapFromBitmapData (
+		XtDisplay (widget),
+		RootWindowOfScreen(XtScreen(widget)),
+		(char *)(bits), width, height,
+		fg, bg, DefaultDepthOfScreen(XtScreen(widget)));
+}
+
+Pixmap XmdReadBitmapFile (Widget widget, const char *filename) {
+	Pixel fg, bg;
+	XtVaGetValues (widget,
+    		XmNforeground, &fg,
+		XmNbackground, &bg, 
+		NULL);
+	unsigned int  width, height;
+	unsigned char *data;
+	int           garbage;
+	XReadBitmapFileData (
+		filename,
+		&width, &height,
+		&data,
+		&garbage, &garbage);
+	Pixmap result = XCreatePixmapFromBitmapData (
+		XtDisplay (widget),
+		RootWindowOfScreen(XtScreen(widget)),
+		(char *)(data), width, height,
+		fg, bg, DefaultDepthOfScreen(XtScreen(widget)));
+	XFree(data);
+	return result;
+}