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[efi] Work around broken UEFI keyboard drivers 

Some UEFI keyboard drivers are blissfully unaware of the existence of
either Ctrl key, and will report "Ctrl-<key>" as just "<key>".  This
breaks substantial portions of the iPXE user interface.

Work around these broken UEFI drivers by allowing "ESC <key>" to be
used as a substitute for "Ctrl-<key>".

Tested-by: Dreamcat4 <dreamcat4@gmail.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown 2016-05-25 15:51:36 +01:00
parent f42b2585fe
commit 8dd39b9572
1 changed files with 7 additions and 2 deletions
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9
src/core/getkey.c
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@ -76,9 +76,14 @@ int getkey ( unsigned long timeout ) {
if ( character != ESC )
return character;
character = getchar_timeout ( GETKEY_TIMEOUT );
if ( character < 0 )
return ESC;
if ( isalpha ( character ) )
return ( toupper ( character ) - 'A' + 1 );
while ( ( character = getchar_timeout ( GETKEY_TIMEOUT ) ) >= 0 ) {
if ( character == '[' )
continue;
if ( isdigit ( character ) ) {
n = ( ( n * 10 ) + ( character - '0' ) );
continue;