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pc, efi loaders: erase characters when backspace is pressed

--- a/sys/src/boot/efi/sub.c

+++ b/sys/src/boot/efi/sub.c

@@ -114,6 +114,8 @@

 				if(*p == '\r')

 					putc('\n');

 				else if(*p == '\b' && p > buf){

+					putc(' ');

+					putc('\b');

 					p--;

 					continue;

 				}

--- a/sys/src/boot/pc/sub.c

+++ b/sys/src/boot/pc/sub.c

@@ -137,6 +137,8 @@

 				if(*p == '\r')

 					putc('\n');

 				else if(*p == '\b' && p > buf){

+					putc(' ');

+					putc('\b');

 					p--;

 					continue;

 				}

-- 

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