Fixed realloc, and fixed right as well

editor.c

@@ -26,19 +26,21 @@ Buffer* new_buffer(int size) {
 }
 
 void buffer_grow(Buffer* buffer) {
+
+	int old_size = buffer->size;
 	int start_offset = buffer->start - buffer->text;
 	buffer->size += 10;
 	buffer->text = realloc(buffer->text,buffer->size);
 	buffer->start = buffer->text + start_offset;
 
 	buffer->gap_size = 10;
-//	for (int i=strlen(buffer->text)-1; i > (buffer->start - buffer->text); i--) {
-	for (int i=0; i < (strlen(buffer->text) - start_offset); i++) {
+	for (int i=0; i < (old_size - start_offset); i++) {
 		*(buffer->start + i + buffer->gap_size) = *(buffer->start + i);
 		*(buffer->start + i) = 0;
 	}
 
 	buffer->end = buffer->start + buffer->gap_size;
+
 }
 
 void buffer_insert(char ch, Buffer* buffer) {
@@ -59,8 +61,10 @@ void buffer_delete(Buffer* buffer) {
 
 void buffer_right(Buffer* buffer) {
 	if (buffer->end != buffer->text + buffer->size) {
+		char c = *(buffer->end);
 		buffer->start++;
 		buffer->end++;
+		*(buffer->start -1) = c;
 	}
 }
 
@@ -70,6 +74,7 @@ void buffer_left(Buffer* buffer) {
 		buffer->start--;
 		buffer->end--;
 		*(buffer->end) = c;
+		*(buffer->start) = 0;
 	}
 }