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printfuefignu-efi

EFI format string reference

Could someone please point me to some reference documentation about EFI "printf" format reference?

I mean it's not like regular printf, as it supports %g as GUID, and prints a question mark for %llu.

My best Google-bet was "efi" "print" "format" reference %g %s %a %d, but it did not gave any usable results. Other search terms came up with some color settings of some printers.

What did i do wrong? How can anyone find this info?

Thanks.

Solution

  • The flags are described in the PrintLib.h file. You can find it here: https://github.com/tianocore/edk2/blob/master/MdePkg/Include/Library/PrintLib.h.

    EDIT:

    The link above is valid if you use EDK2 for building you programs. The flags when building with gnu-efi are described in the print.c file. You can find it here (search for function _Print): https://sourceforge.net/p/gnu-efi/code/ci/master/tree/lib/print.c