1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * String functions
4 *
5 * Copyright (c) 2020 AKASHI Takahiro, Linaro Limited
6 */
7
8 #include <common.h>
9 #include <charset.h>
10 #include <efi_loader.h>
11
12 /**
13 * efi_create_indexed_name - create a string name with an index
14 * @buffer: Buffer
15 * @name: Name string
16 * @index: Index
17 *
18 * Create a utf-16 string with @name, appending @index.
19 * For example, L"Capsule0001"
20 *
21 * The caller must ensure that the buffer has enough space for the resulting
22 * string including the trailing L'\0'.
23 *
24 * Return: A pointer to the next position after the created string
25 * in @buffer, or NULL otherwise
26 */
efi_create_indexed_name(u16 * buffer,size_t buffer_size,const char * name,unsigned int index)27 u16 *efi_create_indexed_name(u16 *buffer, size_t buffer_size, const char *name,
28 unsigned int index)
29 {
30 u16 *p = buffer;
31 char index_buf[5];
32 size_t size;
33
34 size = (utf8_utf16_strlen(name) * sizeof(u16) +
35 sizeof(index_buf) * sizeof(u16));
36 if (buffer_size < size)
37 return NULL;
38 utf8_utf16_strcpy(&p, name);
39 snprintf(index_buf, sizeof(index_buf), "%04X", index);
40 utf8_utf16_strcpy(&p, index_buf);
41
42 return p;
43 }
44