From 077153e085b48e7683552667ab2247c991c1e1ff Mon Sep 17 00:00:00 2001 From: AKASHI Takahiro Date: Thu, 29 Oct 2020 13:47:46 +0900 Subject: [PATCH] efi_loader: add efi_create_indexed_name() 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 Move function to separate module. Use char * as argument instead of u16 *. Reviewed-by: Heinrich Schuchardt Signed-off-by: Heinrich Schuchardt --- include/efi_loader.h | 3 +++ lib/efi_loader/Makefile | 1 + lib/efi_loader/efi_string.c | 36 ++++++++++++++++++++++++++++++++++++ 3 files changed, 40 insertions(+) create mode 100644 lib/efi_loader/efi_string.c diff --git a/include/efi_loader.h b/include/efi_loader.h index 7eea556..f550ced 100644 --- a/include/efi_loader.h +++ b/include/efi_loader.h @@ -804,6 +804,9 @@ 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 char *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/Makefile b/lib/efi_loader/Makefile index 9bad1d1..8892fb0 100644 --- a/lib/efi_loader/Makefile +++ b/lib/efi_loader/Makefile @@ -34,6 +34,7 @@ obj-y += efi_memory.o obj-y += efi_root_node.o obj-y += efi_runtime.o obj-y += efi_setup.o +obj-y += efi_string.o obj-$(CONFIG_EFI_UNICODE_COLLATION_PROTOCOL2) += efi_unicode_collation.o obj-y += efi_var_common.o obj-y += efi_var_mem.o diff --git a/lib/efi_loader/efi_string.c b/lib/efi_loader/efi_string.c new file mode 100644 index 0000000..3de721f --- /dev/null +++ b/lib/efi_loader/efi_string.c @@ -0,0 +1,36 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * String functions + * + * Copyright (c) 2020 AKASHI Takahiro, Linaro Limited + */ + +#include +#include + +/** + * 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" + * + * The caller must ensure that the buffer has enough space for the resulting + * string including the trailing L'\0'. + * + * Return: A pointer to the next position after the created string + * in @buffer, or NULL otherwise + */ +u16 *efi_create_indexed_name(u16 *buffer, const char *name, unsigned int index) +{ + u16 *p = buffer; + char index_buf[5]; + + utf8_utf16_strcpy(&p, name); + sprintf(index_buf, "%04X", index); + utf8_utf16_strcpy(&p, index_buf); + + return p; +} -- 2.7.4