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 <takahiro.akashi@linaro.org>
Move function to separate module.
Use char * as argument instead of u16 *.
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
AKASHI Takahiro 2020-10-29 13:47:46 +09:00 committed by Heinrich Schuchardt
parent c57c943954
commit 077153e085
3 changed files with 40 additions and 0 deletions

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@ -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 */

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@ -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

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@ -0,0 +1,36 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* String functions
*
* Copyright (c) 2020 AKASHI Takahiro, Linaro Limited
*/
#include <common.h>
#include <charset.h>
/**
* 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;
}