[U-Boot] [PATCH 08/14] cfb_console: Add support for some ANSI terminal escape codes

[Pali Rohár]

 * This patch add support for move cursor and reverse colors
   via ANSI espace codes in cfb_console driver
 * ANSI escape codes can be enabled/disabled via CONFIG_CFB_CONSOLE_ANSI

Signed-off-by: Pali Rohár <pali.rohar at gmail.com>
---
Changes since original version:
   - Fixed commit message

 drivers/video/cfb_console.c |  216 ++++++++++++++++++++++++++++++++++++++++++-
 1 files changed, 215 insertions(+), 1 deletions(-)

diff --git a/drivers/video/cfb_console.c b/drivers/video/cfb_console.c
index 3823eae..dc8d99b 100644
--- a/drivers/video/cfb_console.c
+++ b/drivers/video/cfb_console.c
@@ -377,6 +377,10 @@ static int console_row;		/* cursor row */
 
 static u32 eorx, fgx, bgx;	/* color pats */
 
+static char ansi_buf[10] = { 0, };
+static int ansi_buf_size;
+static int ansi_colors_need_revert;
+
 static const int video_font_draw_table8[] = {
 	0x00000000, 0x000000ff, 0x0000ff00, 0x0000ffff,
 	0x00ff0000, 0x00ff00ff, 0x00ffff00, 0x00ffffff,
@@ -602,6 +606,14 @@ static void video_putchar(int xx, int yy, unsigned char c)
 	video_drawchars(xx, yy + video_logo_height, &c, 1);
 }
 
+static void console_swap_colors(void)
+{
+	eorx = fgx;
+	fgx = bgx;
+	bgx = eorx;
+	eorx = fgx ^ bgx;
+}
+
 #if defined(CONFIG_CONSOLE_CURSOR) || defined(CONFIG_VIDEO_SW_CURSOR)
 static void video_set_cursor(void)
 {
@@ -845,7 +857,7 @@ static void console_cr(void)
 	console_col = 0;
 }
 
-void video_putc(const char c)
+static void parse_putc(const char c)
 {
 	static int nl = 1;
 
@@ -888,6 +900,208 @@ void video_putc(const char c)
 	CURSOR_SET;
 }
 
+void video_putc(const char c)
+{
+#ifdef CONFIG_CFB_CONSOLE_ANSI
+	int i;
+
+	if (c == 27) {
+		for (i = 0; i < ansi_buf_size; ++i)
+			parse_putc(ansi_buf[i]);
+		ansi_buf[0] = 27;
+		ansi_buf_size = 1;
+		return;
+	}
+
+	if (ansi_buf_size > 0) {
+		/*
+		0 - ESC
+		1 - [
+		2 - num1
+		3 - ..
+		4 - ;
+		5 - num2
+		6 - ..
+		7 - cchar
+		*/
+		int next = 0;
+
+		int flush = 0;
+		int fail = 0;
+
+		int num1 = 0;
+		int num2 = 0;
+		int cchar = 0;
+
+		ansi_buf[ansi_buf_size++] = c;
+
+		if (ansi_buf_size >= sizeof(ansi_buf))
+			fail = 1;
+
+		for (i = 0; i < ansi_buf_size; ++i) {
+			if (fail)
+				break;
+
+			switch (next) {
+			case 0:
+				if (ansi_buf[i] == 27)
+					next = 1;
+				else
+					fail = 1;
+				break;
+
+			case 1:
+				if (ansi_buf[i] == '[')
+					next = 2;
+				else
+					fail = 1;
+				break;
+
+			case 2:
+				if (ansi_buf[i] >= '0' && ansi_buf[i] <= '9') {
+					num1 = ansi_buf[i]-'0';
+					next = 3;
+				} else {
+					--i;
+					num1 = 1;
+					next = 4;
+				}
+				break;
+
+			case 3:
+				if (ansi_buf[i] >= '0' && ansi_buf[i] <= '9') {
+					num1 *= 10;
+					num1 += ansi_buf[i]-'0';
+				} else {
+					--i;
+					next = 4;
+				}
+				break;
+
+			case 4:
+				if (ansi_buf[i] != ';') {
+					--i;
+					next = 7;
+				} else
+					next = 5;
+				break;
+
+			case 5:
+				if (ansi_buf[i] >= '0' && ansi_buf[i] <= '9') {
+					num2 = ansi_buf[i]-'0';
+					next = 6;
+				} else
+					fail = 1;
+				break;
+
+			case 6:
+				if (ansi_buf[i] >= '0' && ansi_buf[i] <= '9') {
+					num2 *= 10;
+					num2 += ansi_buf[i]-'0';
+				} else {
+					--i;
+					next = 7;
+				}
+				break;
+
+			case 7:
+				if ((ansi_buf[i] >= 'A' && ansi_buf[i] <= 'H')
+					|| ansi_buf[i] == 'J'
+					|| ansi_buf[i] == 'K'
+					|| ansi_buf[i] == 'm') {
+					cchar = ansi_buf[i];
+					flush = 1;
+				} else
+					fail = 1;
+				break;
+			}
+		}
+
+		if (fail) {
+			for (i = 0; i < ansi_buf_size; ++i)
+				parse_putc(ansi_buf[i]);
+			ansi_buf_size = 0;
+			return;
+		}
+
+		if (flush) {
+			CURSOR_OFF;
+			ansi_buf_size = 0;
+			switch (cchar) {
+			case 'A':
+				/* move cursor num1 rows up */
+				console_cursor_up(num1);
+				break;
+			case 'B':
+				/* move cursor num1 rows down */
+				console_cursor_down(num1);
+				break;
+			case 'C':
+				/* move cursor num1 columns forward */
+				console_cursor_right(num1);
+				break;
+			case 'D':
+				/* move cursor num1 columns back */
+				console_cursor_left(num1);
+				break;
+			case 'E':
+				/* move cursor num1 rows up at begin of row */
+				console_previewsline(num1);
+				break;
+			case 'F':
+				/* move cursor num1 rows down at begin of row */
+				console_newline(num1);
+				break;
+			case 'G':
+				/* move cursor to column num1 */
+				console_cursor_set_position(-1, num1-1);
+				break;
+			case 'H':
+				/* move cursor to row num1, column num2 */
+				console_cursor_set_position(num1-1, num2-1);
+				break;
+			case 'J':
+				/* clear console and move cursor to 0, 0 */
+				console_clear();
+				console_cursor_set_position(0, 0);
+				break;
+			case 'K':
+				/* clear line */
+				if (num1 == 0)
+					console_clear_line(console_row,
+							console_col,
+							CONSOLE_COLS-1);
+				else if (num1 == 1)
+					console_clear_line(console_row,
+							0, console_col);
+				else
+					console_clear_line(console_row,
+							0, CONSOLE_COLS-1);
+				break;
+			case 'm':
+				if (num1 == 0) { /* reset swapped colors */
+					if (ansi_colors_need_revert) {
+						console_swap_colors();
+						ansi_colors_need_revert = 0;
+					}
+				} else if (num1 == 7) { /* once swap colors */
+					if (!ansi_colors_need_revert) {
+						console_swap_colors();
+						ansi_colors_need_revert = 1;
+					}
+				}
+				break;
+			}
+			CURSOR_SET;
+		}
+	} else {
+		parse_putc(c);
+	}
+#else
+	parse_putc(c);
+#endif
+}
+
 void video_puts(const char *s)
 {
 	int count = strlen(s);
-- 
1.7.5.4