[U-Boot] [PATCH v2 09/11] New command clear: Clear the ANSI terminal

[Pali Rohár]

 * Command can be enabled by CONFIG_CMD_CLEAR
 * Added some ANSI escape codes definitions in common.h

Signed-off-by: Pali Rohár <pali.rohar at gmail.com>
Cc: Marcel Mol <marcel at mesa.nl>
---
Changes since original version:
   - Renamed command clr to clear
   - Use puts instead printf
   - Move cursor to pos1,1
   - Merged parts of patch "Add some ANSI escape codes definitions in common.h"

 common/Makefile          |    1 +
 common/cmd_clear.c       |   42 ++++++++++++++++++++++++++++++++++++++++++
 include/common.h         |    7 +++++++
 include/config_cmd_all.h |    1 +
 4 files changed, 51 insertions(+)
 create mode 100644 common/cmd_clear.c

diff --git a/common/Makefile b/common/Makefile
index d9f10f3..0682a49 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -70,6 +70,7 @@ COBJS-$(CONFIG_CMD_BEDBUG) += bedbug.o cmd_bedbug.o
 COBJS-$(CONFIG_CMD_BMP) += cmd_bmp.o
 COBJS-$(CONFIG_CMD_BOOTLDR) += cmd_bootldr.o
 COBJS-$(CONFIG_CMD_CACHE) += cmd_cache.o
+COBJS-$(CONFIG_CMD_CLEAR) += cmd_clear.o
 COBJS-$(CONFIG_CMD_CONSOLE) += cmd_console.o
 COBJS-$(CONFIG_CMD_CPLBINFO) += cmd_cplbinfo.o
 COBJS-$(CONFIG_DATAFLASH_MMC_SELECT) += cmd_dataflash_mmc_mux.o
diff --git a/common/cmd_clear.c b/common/cmd_clear.c
new file mode 100644
index 0000000..597611e
--- /dev/null
+++ b/common/cmd_clear.c
@@ -0,0 +1,42 @@
+/*
+ * Copyright 2011
+ * Marcel Mol, MESA Consulting, marcel at mesa.nl
+ *
+ * Copyright 2011
+ * Pali Rohár, pali.rohar at gmail.com
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <command.h>
+
+static int do_clear(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	puts(ANSI_CLEAR_CONSOLE);
+	printf(ANSI_CURSOR_POSITION, 1, 1);
+	return 0;
+}
+
+U_BOOT_CMD(
+	clear,    CONFIG_SYS_MAXARGS,     1,      do_clear,
+	"clear",
+	"\n"
+	"    - clear screen and move cursor to top of screen"
+);
diff --git a/include/common.h b/include/common.h
index 4b5841e..26bfd95 100644
--- a/include/common.h
+++ b/include/common.h
@@ -743,6 +743,13 @@ void	clear_ctrlc (void);	/* clear the Control-C condition */
 int	disable_ctrlc (int);	/* 1 to disable, 0 to enable Control-C detect */
 
 /*
+ * ANSI terminal
+ */
+
+#define ANSI_CURSOR_POSITION		"\e[%d;%dH"
+#define ANSI_CLEAR_CONSOLE		"\e[2J"
+
+/*
  * STDIO based functions (can always be used)
  */
 /* serial stuff */
diff --git a/include/config_cmd_all.h b/include/config_cmd_all.h
index 2c6b829..243098a 100644
--- a/include/config_cmd_all.h
+++ b/include/config_cmd_all.h
@@ -24,6 +24,7 @@
 #define CONFIG_CMD_BSP		/* Board Specific functions	*/
 #define CONFIG_CMD_CACHE	/* icache, dcache		*/
 #define CONFIG_CMD_CDP		/* Cisco Discovery Protocol	*/
+#define CONFIG_CMD_CLEAR	/* ANSI clear screen command	*/
 #define CONFIG_CMD_CONSOLE	/* coninfo			*/
 #define CONFIG_CMD_DATE		/* support for RTC, date/time...*/
 #define CONFIG_CMD_DHCP		/* DHCP Support			*/
-- 
1.7.9.5