Fixed realloc, and fixed right as well

editor.c

@@ -26,18 +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 *= 2;
+	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--) {
-		*(buffer->text + i + buffer->gap_size) = *(buffer->start + 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) {
@@ -49,16 +52,30 @@ void buffer_insert(char ch, Buffer* buffer) {
 	}
 }
 
+void buffer_delete(Buffer* buffer) {
+	if (buffer->start != buffer->text) {
+		buffer->start--;
+		buffer->gap_size++;
+	}
+}
+
 void buffer_right(Buffer* buffer) {
-	buffer->start++;
-	buffer->end--;
+	if (buffer->end != buffer->text + buffer->size) {
+		char c = *(buffer->end);
+		buffer->start++;
+		buffer->end++;
+		*(buffer->start -1) = c;
+	}
 }
 
 void buffer_left(Buffer* buffer) {
-	buffer->start--;
-	buffer->end--;
-	
-
+	if (buffer->start != buffer->text) {
+		char c = *(buffer->start - 1);
+		buffer->start--;
+		buffer->end--;
+		*(buffer->end) = c;
+		*(buffer->start) = 0;
+	}
 }
 
 void init_curses() {
@@ -79,6 +96,8 @@ int main() {
 	Buffer* buffer = new_buffer(10);
 	init_curses();
 	int ch;
+
+	int y, x;
 	while (true) {
 		clear();
 
@@ -86,29 +105,41 @@ int main() {
 		if (buffer->start != buffer->text) {  /* We don't want to print the string, if the 
 							gap starts at the first index of the string */
 
-	                while (i < strlen(buffer->text)) {
+	                while (i < buffer->size) {
 	                        addch(*(buffer->text + i));
 				i++;
 	                        if ((buffer->start - buffer->text) == i) {  /* If we have encountered 
 										the start of the gap */
+					getyx(stdscr,y,x);
 	                                i += buffer->gap_size;
 				}
 	                }
+
+			move(y,x);
+
 		}
 
+
 		ch = getch();
 
 		switch(ch) {
 			case KEY_BACKSPACE:
-				if (buffer->start != buffer->text) {
-					buffer->start--;
-					buffer->gap_size++;
-				}
-				goto continue_while_loop;
-			default:
-		}
-		buffer_insert(ch,buffer);
+				buffer_delete(buffer);
+				break;
 
+			case KEY_LEFT:
+				buffer_left(buffer);
+				break;
+
+			case KEY_RIGHT:
+				buffer_right(buffer);
+				break;
+
+			default:
+				buffer_insert(ch,buffer);
+
+		}
+		
 		continue_while_loop:
 
 	}