efi/libstub: Get the exact UTF-8 length

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efi_convert_cmdline currently overestimates the length of the equivalent
UTF-8 encoding.

snprintf can now be used to do the conversion to UTF-8, however, it does
not have a way to specify the size of the UTF-16 string, only the size
of the resulting UTF-8 string. So in order to use it, we need to
precalculate the exact UTF-8 size.

Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Link: https://lore.kernel.org/r/20200518190716.751506-24-nivedita@alum.mit.edu
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>

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Arvind Sankar 2020-05-18 15:07:15 -04:00 • committed by Ard Biesheuvel

parent a713979e44

commit 15c316bcbc

1 changed files with 32 additions and 12 deletions

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drivers/firmware/efi/libstub/efi-stub-helper.c

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