From 828aa1f00ec3508a4d813bd60d210de82929ac97 Mon Sep 17 00:00:00 2001 From: Mike Waychison Date: Thu, 21 Jul 2011 16:57:58 -0400 Subject: [PATCH] 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 Signed-off-by: Tony Luck --- drivers/firmware/efivars.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/drivers/firmware/efivars.c b/drivers/firmware/efivars.c index 4202a31..15b9a01 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) { -- 2.7.4