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video/console: Implement relative cursor movement ANSI handling

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The ANSI terminal escapce sequence standard defines relative cursor
movement commands (ESC [ A-F). So far the DM_VIDEO console code was
ignoring them.

Interpret those sequences and move the cursor by the requested amount of
rows or columns in the right direction. This brings the code on par with
the legacy video console driver (cfb_console).

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Andre Przywara 2019-03-23 01:29:57 +00:00 committed by Anatolij Gustschin
parent eabb0725d4
commit 29c158b90d
1 changed files with 37 additions and 0 deletions
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37
drivers/video/vidconsole-uclass.c
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@ -259,6 +259,43 @@ static void vidconsole_escape_char(struct udevice *dev, char ch)
priv->escape = 0;
switch (ch) {
case 'A':
case 'B':
case 'C':
case 'D':
case 'E':
case 'F': {
int row, col, num;
char *s = priv->escape_buf;
/*
* Cursor up/down: [%dA, [%dB, [%dE, [%dF
* Cursor left/right: [%dD, [%dC
*/
s++; /* [ */
s = parsenum(s, &num);
if (num == 0) /* No digit in sequence ... */
num = 1; /* ... means "move by 1". */
get_cursor_position(priv, &row, &col);
if (ch == 'A' || ch == 'F')
row -= num;
if (ch == 'C')
col += num;
if (ch == 'D')
col -= num;
if (ch == 'B' || ch == 'E')
row += num;
if (ch == 'E' || ch == 'F')
col = 0;
if (col < 0)
col = 0;
if (row < 0)
row = 0;
/* Right and bottom overflows are handled in the callee. */
set_cursor_position(priv, row, col);
break;
}
case 'H':
case 'f': {
int row, col;