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Commit 828aa1f0 authored by Mike Waychison's avatar Mike Waychison Committed by Tony Luck
Browse files

efivars: introduce utf16_strncmp 



Introduce utf16_strncmp which is used in the next patch.  Semantics
should be the same as the strncmp C function.

Signed-off-by: default avatarMike Waychison <mikew@google.com>
Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
parent a2940908

drivers/firmware/efivars.c

+18 −0
Original line number Diff line number Diff line
@@ -169,6 +169,24 @@ utf16_strsize(efi_char16_t *data, unsigned long maxlength) 
	return utf16_strnlen(data, maxlength/sizeof(efi_char16_t)) * sizeof(efi_char16_t);

}



static inline int

utf16_strncmp(const efi_char16_t *a, const efi_char16_t *b, size_t len)

{

	while (1) {

		if (len == 0)

			return 0;

		if (*a < *b)

			return -1;

		if (*a > *b)

			return 1;

		if (*a == 0) /* implies *b == 0 */

			return 0;

		a++;

		b++;

		len--;

	}

}



static efi_status_t

get_var_data_locked(struct efivars *efivars, struct efi_variable *var)

{