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 #include <malloc.h>
12
13 /**
14 * efi_create_indexed_name - create a string name with an index
15 * @buffer: Buffer
16 * @name: Name string
17 * @index: Index
18 *
19 * Create a utf-16 string with @name, appending @index.
20 * For example, u"Capsule0001"
21 *
22 * The caller must ensure that the buffer has enough space for the resulting
23 * string including the trailing L'\0'.
24 *
25 * Return: A pointer to the next position after the created string
26 * in @buffer, or NULL otherwise
27 */
efi_create_indexed_name(u16 * buffer,size_t buffer_size,const char * name,unsigned int index)28 u16 *efi_create_indexed_name(u16 *buffer, size_t buffer_size, const char *name,
29 unsigned int index)
30 {
31 u16 *p = buffer;
32 char index_buf[5];
33 size_t size;
34
35 size = (utf8_utf16_strlen(name) * sizeof(u16) +
36 sizeof(index_buf) * sizeof(u16));
37 if (buffer_size < size)
38 return NULL;
39 utf8_utf16_strcpy(&p, name);
40 snprintf(index_buf, sizeof(index_buf), "%04X", index);
41 utf8_utf16_strcpy(&p, index_buf);
42
43 return p;
44 }
45
46 /**
47 * efi_convert_string - Convert an ASCII or UTF-8 string to UTF-16
48 * @str: String to be converted
49 *
50 * Return: Converted string in UTF-16 format. The caller is responsible for
51 * freeing this string when it is no longer needed.
52 */
efi_convert_string(const char * str)53 efi_string_t efi_convert_string(const char *str)
54 {
55 efi_string_t str_16, tmp;
56 size_t sz_16;
57
58 sz_16 = utf8_utf16_strlen(str);
59 str_16 = calloc(sz_16 + 1, sizeof(u16));
60 if (!str_16)
61 return NULL;
62
63 tmp = str_16;
64 utf8_utf16_strcpy(&tmp, str);
65
66 return str_16;
67 }
68