commit 3a043884573dda925cf28686eb22988a03bc2e23
author Janne Grunau <j@jannau.net> Sat Mar 16 22:50:20 2024 +0100
committer Heinrich Schuchardt <heinrich.schuchardt@canonical.com> Thu Mar 21 06:56:13 2024 +0100
tree a115746e618ed9af41a026aa18a09cb87676bba3
parent 5548c36eb8024138874610a6f71079640bf77ad9

lib/charset: Map Unicode code points to CP437 code points 1-31

Code page 437 uses code points 1-31 for glyphs instead of control
characters. Map the appropriate Unicode code points to this code points.
Fixes rendering of grub2's menu as EFI application using the
EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL on a console with bitmap fonts.

Signed-off-by: Janne Grunau <j@jannau.net>

include/cp1250.h

diff --git a/include/cp1250.h b/include/cp1250.h
index adacf8a..b762c78 100644
--- a/include/cp1250.h
+++ b/include/cp1250.h
@@ -1,10 +1,18 @@
 /* SPDX-License-Identifier: GPL-2.0+ */
 
 /*
- * Constant CP1250 contains the Unicode code points for characters 0x80 - 0xff
- * of the code page 1250.
+ * Constant CP1250 contains the Unicode code points for characters 0x00 - 0x1f
+ * and 0x80 - 0xff of the code page 1250.
  */
 #define CP1250 { \
+	0x0000, 0x0000, 0x0000, 0x0000, \
+	0x0000, 0x0000, 0x0000, 0x0000, \
+	0x0000, 0x0000, 0x0000, 0x0000, \
+	0x0000, 0x0000, 0x0000, 0x0000, \
+	0x0000, 0x0000, 0x0000, 0x0000, \
+	0x0000, 0x0000, 0x0000, 0x0000, \
+	0x0000, 0x0000, 0x0000, 0x0000, \
+	0x0000, 0x0000, 0x0000, 0x0000, \
 	0x20ac, 0x0000, 0x201a, 0x0000, \
 	0x201e, 0x2026, 0x2020, 0x2021, \
 	0x0000, 0x2030, 0x0160, 0x2039, \