Added support for \ESC[%dX (erase characters).

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@25988 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/apps/terminal/BasicTerminalBuffer.cpp

@@ -628,6 +628,29 @@ BasicTerminalBuffer::InsertSpace(int32 num)
 }
 
 
+void
+BasicTerminalBuffer::EraseChars(int32 numChars)
+{
+	TerminalLine* line = _LineAt(fCursor.y);
+	if (fCursor.y >= line->length)
+		return;
+
+	int32 first = fCursor.x;
+	int32 end = min_c(fCursor.x + numChars, line->length);
+	if (first > 0 && IS_WIDTH(line->cells[first - 1].attributes))
+		first--;
+	if (end > 0 && IS_WIDTH(line->cells[end - 1].attributes))
+		end++;
+
+	for (int32 i = first; i < end; i++) {
+		line->cells[i].character = kSpaceChar;
+		line->cells[i].attributes = 0;
+	}
+
+	_Invalidate(fCursor.y, fCursor.y);
+}
+
+
 void
 BasicTerminalBuffer::EraseAbove()
 {

src/apps/terminal/BasicTerminalBuffer.h

@@ -104,6 +104,7 @@ public:
 			void				InsertLines(int32 numLines);
 	
 			// delete chars/lines
+			void				EraseChars(int32 numChars);
 			void				EraseAbove();
 			void				EraseBelow();
 			void				DeleteChars(int32 numChars);

src/apps/terminal/TermParse.cpp

@@ -959,6 +959,14 @@ TermParse::EscParse()
 					parsestate = groundtable;
 					break;
 
+
+				case CASE_ECH:	// erase characters
+					if ((col = param[0]) < 1)
+						col = 1;
+					fBuffer->EraseChars(col);
+					parsestate = groundtable;
+					break;
+
 				default:
 					break;
 		}

src/apps/terminal/VTPrsTbl.c

@@ -1122,7 +1122,7 @@ CASE_GROUND_STATE,
 CASE_GROUND_STATE,
 CASE_GROUND_STATE,
 /*	X		Y		Z		[	*/
-CASE_GROUND_STATE,
+CASE_ECH,
 CASE_GROUND_STATE,
 CASE_GROUND_STATE,
 CASE_GROUND_STATE,

src/apps/terminal/VTparse.h

@@ -120,5 +120,6 @@
 #define CASE_VPA 87
 #define CASE_HPA 88
 
-#define CASE_SU 89	/* scroll screen up */
-#define CASE_SD 90	/* scroll screen down */
+#define CASE_SU		89	/* scroll screen up */
+#define CASE_SD		90	/* scroll screen down */
+#define CASE_ECH 	91	/* erase characters */