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authorMike Waychison <mikew@google.com>2011-07-21 16:57:58 -0400
committerTony Luck <tony.luck@intel.com>2011-07-22 16:15:31 -0700
commit828aa1f00ec3508a4d813bd60d210de82929ac97 (patch)
tree2772ba015552aa2eb12f7d137d55ea0c26421f9c /drivers/firmware
parenta2940908391f3cee72e38769b30e829b22742b5b (diff)
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>
Diffstat (limited to 'drivers/firmware')
-rw-r--r--drivers/firmware/efivars.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/firmware/efivars.c b/drivers/firmware/efivars.c
index 4202a317046..15b9a01b6c6 100644
--- a/drivers/firmware/efivars.c
+++ b/drivers/firmware/efivars.c
@@ -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)
{