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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: Mike Waychison <mikew@google.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Mike Waychison 2011-07-21 16:57:58 -04:00 committed by Tony Luck
parent a294090839
commit 828aa1f00e
1 changed files with 18 additions and 0 deletions
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18
drivers/firmware/efivars.c
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@ -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)
{