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From c5e950e3eceeb286dbdd4c5c2f3bc53979ad1a1d Mon Sep 17 00:00:00 2001
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From: Andrey Borzenkov <arvidjaar@gmail.com>
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Date: Mon, 8 Apr 2013 19:51:33 +0200
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Subject: [PATCH 273/482] * grub-core/term/i386/pc/console.c: Fix cursor
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moving algorithm.
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---
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ChangeLog | 4 ++++
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grub-core/term/i386/pc/console.c | 24 +++++++++---------------
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2 files changed, 13 insertions(+), 15 deletions(-)
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diff --git a/ChangeLog b/ChangeLog
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index 3a241c0..9e08bea 100644
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--- a/ChangeLog
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+++ b/ChangeLog
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@@ -1,3 +1,7 @@
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+2013-04-08 Andrey Borzenkov <arvidjaar@gmail.com>
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+
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+ * grub-core/term/i386/pc/console.c: Fix cursor moving algorithm.
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+
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2013-04-08 Bryan Hundven <bryanhundven@gmail.com>
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* docs/grub-dev.texi: Move @itemize after @subsection to satisfy
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diff --git a/grub-core/term/i386/pc/console.c b/grub-core/term/i386/pc/console.c
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index ee6650b..358611a 100644
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--- a/grub-core/term/i386/pc/console.c
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+++ b/grub-core/term/i386/pc/console.c
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@@ -86,13 +86,9 @@ grub_console_gotoxy (struct grub_term_output *term __attribute__ ((unused)),
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* Put the character C on the console. Because GRUB wants to write a
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* character with an attribute, this implementation is a bit tricky.
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* If C is a control character (CR, LF, BEL, BS), use INT 10, AH = 0Eh
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- * (TELETYPE OUTPUT). Otherwise, save the original position, put a space,
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- * save the current position, restore the original position, write the
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- * character and the attribute, and restore the current position.
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- *
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- * The reason why this is so complicated is that there is no easy way to
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- * get the height of the screen, and the TELETYPE OUTPUT BIOS call doesn't
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- * support setting a background attribute.
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+ * (TELETYPE OUTPUT). Otherwise, use INT 10, AH = 9 to write character
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+ * with attributes and advance cursor. If we are on the last column,
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+ * let BIOS to wrap line correctly.
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*/
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static void
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grub_console_putchar_real (grub_uint8_t c)
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@@ -112,19 +108,18 @@ grub_console_putchar_real (grub_uint8_t c)
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/* get the current position */
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pos = grub_console_getxy (NULL);
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+ /* write the character with the attribute */
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+ int10_9 (c, 1);
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+
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/* check the column with the width */
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if ((pos & 0xff00) >= (79 << 8))
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{
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grub_console_putchar_real (0x0d);
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grub_console_putchar_real (0x0a);
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- /* get the current position */
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- pos = grub_console_getxy (NULL);
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}
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+ else
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+ grub_console_gotoxy (NULL, ((pos & 0xff00) >> 8) + 1, (pos & 0xff));
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- /* write the character with the attribute */
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- int10_9 (c, 1);
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-
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- grub_console_gotoxy (NULL, ((pos & 0xff00) >> 8) + 1, (pos & 0xff));
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}
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static void
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@@ -255,8 +250,7 @@ grub_console_getkeystatus (struct grub_term_input *term __attribute__ ((unused))
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static grub_uint16_t
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grub_console_getwh (struct grub_term_output *term __attribute__ ((unused)))
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{
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- /* Due to current cursor moving algorithm we lost the last column. */
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- return (79 << 8) | 25;
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+ return (80 << 8) | 25;
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}
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static void
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--
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1.8.2.1
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