This function will be used from several places in UEFI subsystem to generate some specific form of utf-16 variable name. For example, L"Capsule0001"
Signed-off-by: AKASHI Takahiro takahiro.akashi@linaro.org --- include/efi_loader.h | 3 +++ lib/efi_loader/efi_setup.c | 30 ++++++++++++++++++++++++++++++ 2 files changed, 33 insertions(+)
diff --git a/include/efi_loader.h b/include/efi_loader.h index 98944640bee7..d33efa9e9b13 100644 --- a/include/efi_loader.h +++ b/include/efi_loader.h @@ -795,6 +795,9 @@ bool efi_image_parse(void *efi, size_t len, struct efi_image_regions **regp, /* runtime implementation of memcpy() */ void efi_memcpy_runtime(void *dest, const void *src, size_t n);
+/* commonly used helper function */ +u16 *efi_create_indexed_name(u16 *buffer, const u16 *name, unsigned int index); + #else /* CONFIG_IS_ENABLED(EFI_LOADER) */
/* Without CONFIG_EFI_LOADER we don't have a runtime section, stub it out */ diff --git a/lib/efi_loader/efi_setup.c b/lib/efi_loader/efi_setup.c index 6196c0a06cd7..a09a7b607e11 100644 --- a/lib/efi_loader/efi_setup.c +++ b/lib/efi_loader/efi_setup.c @@ -6,6 +6,7 @@ */
#include <common.h> +#include <charset.h> #include <bootm.h> #include <efi_loader.h> #include <efi_variable.h> @@ -230,3 +231,32 @@ out: efi_obj_list_initialized = ret; return ret; } + +/** + * efi_create_indexed_name - create a string name with an index + * @buffer: Buffer + * @name: Name string + * @index: Index + * + * Create a utf-16 string with @name, appending @index. + * For example, L"Capsule0001" + * This function is expected to be called only from several places + * in EFI subsystem. A caller should ensure that the buffer have + * enough space for a resulting string, including L"\0". + * No strict check against the length will be done here. + * + * Return: A pointer to the next position after the created string + * in @buffer, or NULL otherwise + */ +u16 *efi_create_indexed_name(u16 *buffer, const u16 *name, unsigned int index) +{ + u16 *p; + char index_buf[5]; + + u16_strcpy(buffer, name); + p = buffer + utf16_strnlen(name, SIZE_MAX); + sprintf(index_buf, "%04X", index); + utf8_utf16_strcpy(&p, index_buf); + + return p; +}