From 077153e085b48e7683552667ab2247c991c1e1ff Mon Sep 17 00:00:00 2001 From: AKASHI Takahiro Date: Thu, 29 Oct 2020 13:47:46 +0900 Subject: 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 --- lib/efi_loader/efi_string.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) create mode 100644 lib/efi_loader/efi_string.c (limited to 'lib/efi_loader/efi_string.c') diff --git a/lib/efi_loader/efi_string.c b/lib/efi_loader/efi_string.c new file mode 100644 index 00000000000..3de721f06c7 --- /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; +} -- cgit v1.2.3