yterm

diff --git a/source/buffer.c b/source/buffer.c
index 6a4ddbe6f52732a937927eb3c749ef0385eb6a26..aa15bf3ea745cae39d25998b58710d9636633f17 100644
--- a/source/buffer.c
+++ b/source/buffer.c
@@ -9,6 +9,10 @@ 		.invert = false
 	};
 }
 
+BufCell BufAttr_BlankCell(void) {
+	return (BufCell) {0, BufAttr_Default()};
+}
+
 static BufCell FromChar(char ch) {
 	BufCell ret;
 	ret.ch   = ch;
@@ -84,6 +88,12 @@
 	if (!cell) return;
 
 	cell->attr.invert = !cell->attr.invert;
+}
+
+void Buffer_ClearLine(Buffer* buf, int line) {
+	for (int i = 0; i < buf->width; ++ i) {
+		Buffer_Set(buf, i, line, BufAttr_BlankCell());
+	}
 }
 
 void Buffer_Clear(Buffer* buf) {




diff --git a/source/buffer.h b/source/buffer.h
index d3938aa7002ba9202e0531c06e16122b4b2b0207..8e8c32d480e43aa68fa85b1bd19a94bf289b7fd7 100644
--- a/source/buffer.h
+++ b/source/buffer.h
@@ -37,6 +37,7 @@ 	int      height;
 } Buffer;
 
 BufAttr BufAttr_Default(void);
+BufCell BufAttr_BlankCell(void);
 
 Buffer   Buffer_New(int width, int height);
 void     Buffer_Free(Buffer* buf);
@@ -45,6 +46,7 @@ bool     Buffer_CellEq(BufCell a, BufCell b);
 BufCell* Buffer_Get(Buffer* buf, int x, int y);
 void     Buffer_Set(Buffer* buf, int x, int y, BufCell cell);
 void     Buffer_InvertCell(Buffer* buf, int x, int y);
+void     Buffer_ClearLine(Buffer* buf, int line);
 void     Buffer_Clear(Buffer* buf);
 void     Buffer_Print(Buffer* buf, int x, int y, BufAttr attr, const char* str);
 void     Buffer_Blit(Buffer* dest, Buffer* src, int x, int y, Rect clip);




diff --git a/source/interpreter/vt100.c b/source/interpreter/vt100.c
index c892111233fb9638d0f72f65d1c562b883d992d4..01c7fc4023e4851e219c7f30bfa24fa0c82ad7d1 100644
--- a/source/interpreter/vt100.c
+++ b/source/interpreter/vt100.c
@@ -105,6 +105,15 @@ 				terminal->cursor.x = 0;
 			}
 			break;
 		}
+		case 'G': { // set cursor column
+			if (num < 1) {
+				terminal->cursor.x = 0;
+			}
+			else {
+				terminal->cursor.x = atoi(parts[0]) - 1;
+			}
+			break;
+		}
 		case 'H':
 		case 'f': {
 			if (num < 2) return;
@@ -121,13 +130,82 @@ 			terminal->cursor = (Vec2) {x, y};
 			break;
 		}
 		case 'J': {
-			if (num < 1) return;
+			int op = 0;
+
+			if (num >= 1) {
+				op = atoi(parts[0]);
+			}
 
-			switch (atoi(parts[0])) {
+			switch (op) {
+				case 0: {
+					for (int i = terminal->cursor.y; i < terminal->buffer.height; ++ i) {
+						Buffer_ClearLine(&terminal->buffer, i);
+					}
+					break;
+				}
+				case 1: {
+					for (int i = 0; i < terminal->cursor.y; ++ i) {
+						Buffer_ClearLine(&terminal->buffer, i);
+					}
+					break;
+				}
 				case 2: {
 					Buffer_Clear(&terminal->buffer);
 					break;
 				}
+			}
+			break;
+		}
+		case 'K': { // erase in line
+			int op = 0;
+
+			if (num >= 1) {
+				op = atoi(parts[0]);
+			}
+
+			switch (op) {
+				case 0: {
+					// TODO: compare with other impls
+					for (int i = terminal->cursor.x + 1; i < terminal->buffer.width; ++ i) {
+						Buffer_Set(&terminal->buffer, i, terminal->cursor.y, BufAttr_BlankCell());
+					}
+					break;
+				}
+				case 1: {
+					for (int i = 0; i < terminal->cursor.x; ++ i) {
+						Buffer_Set(&terminal->buffer, i, terminal->cursor.y, BufAttr_BlankCell());
+					}
+					break;
+				}
+				case 2: {
+					for (int i = 0; i < terminal->buffer.width; ++ i) {
+						Buffer_Set(&terminal->buffer, i, terminal->cursor.y, BufAttr_BlankCell());
+					}
+					break;
+				}
+			}
+			break;
+		}
+		case 'X': {
+			if (num < 1) return;
+			int chars = atoi(parts[0]);
+
+			for (int i = 0; i < chars; ++ i) {
+				if (i + terminal->cursor.x >= terminal->buffer.width) break;
+
+				Buffer_Set(
+					&terminal->buffer, terminal->cursor.x + i, terminal->cursor.y,
+					BufAttr_BlankCell()
+				);
+			}
+			break;
+		}
+		case 'd': { // cursor row position
+			if (num < 1) {
+				terminal->cursor.y = 1;
+			}
+			else {
+				terminal->cursor.y = atoi(parts[0]) - 1;
 			}
 			break;
 		}