1 /*
2 * Copyright (c) Huawei Technologies Co., Ltd. 2014-2021. All rights reserved.
3 * Licensed under Mulan PSL v2.
4 * You can use this software according to the terms and conditions of the Mulan PSL v2.
5 * You may obtain a copy of Mulan PSL v2 at:
6 * http://license.coscl.org.cn/MulanPSL2
7 * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
8 * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
9 * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
10 * See the Mulan PSL v2 for more details.
11 * Description: wmemcpy_s function
12 * Create: 2014-02-25
13 */
14 /*
15 * [Standardize-exceptions] Use unsafe function: Portability
16 * [reason] Use unsafe function to implement security function to maintain platform compatibility.
17 * And sufficient input validation is performed before calling
18 */
19
20 #include "securecutil.h"
21
22 /*
23 * <FUNCTION DESCRIPTION>
24 * The wmemcpy_s function copies n successive wide characters
25 * from the object pointed to by src into the object pointed to by dest.t.
26 *
27 * <INPUT PARAMETERS>
28 * dest Destination buffer.
29 * destMax Size of the destination buffer.
30 * src Buffer to copy from.
31 * count Number of characters to copy.
32 *
33 * <OUTPUT PARAMETERS>
34 * dest buffer is updated.
35 *
36 * <RETURN VALUE>
37 * EOK Success
38 * EINVAL dest is NULL and destMax != 0 and count <= destMax
39 * and destMax <= SECUREC_WCHAR_MEM_MAX_LEN
40 * EINVAL_AND_RESET dest != NULL and src is NULL and destMax != 0
41 * and destMax <= SECUREC_WCHAR_MEM_MAX_LEN and count <= destMax
42 * ERANGE destMax > SECUREC_WCHAR_MEM_MAX_LEN or destMax is 0 or
43 * (count > destMax and dest is NULL and destMax != 0
44 * and destMax <= SECUREC_WCHAR_MEM_MAX_LEN)
45 * ERANGE_AND_RESET count > destMax and dest != NULL and destMax != 0
46 * and destMax <= SECUREC_WCHAR_MEM_MAX_LEN
47 * EOVERLAP_AND_RESET dest buffer and source buffer are overlapped and
48 * count <= destMax destMax != 0 and destMax <= SECUREC_WCHAR_MEM_MAX_LEN
49 * and dest != NULL and src != NULL and dest != src
50 *
51 * if an error occurred, dest will be filled with 0 when dest and destMax valid .
52 * If the source and destination overlap, the behavior of wmemcpy_s is undefined.
53 * Use wmemmove_s to handle overlapping regions.
54 */
wmemcpy_s(wchar_t * dest,size_t destMax,const wchar_t * src,size_t count)55 errno_t wmemcpy_s(wchar_t *dest, size_t destMax, const wchar_t *src, size_t count)
56 {
57 if (destMax == 0 || destMax > SECUREC_WCHAR_MEM_MAX_LEN) {
58 SECUREC_ERROR_INVALID_PARAMTER("wmemcpy_s");
59 return ERANGE;
60 }
61 if (count > destMax) {
62 SECUREC_ERROR_INVALID_PARAMTER("wmemcpy_s");
63 if (dest != NULL) {
64 (void)SECUREC_MEMSET_FUNC_OPT(dest, 0, destMax * sizeof(wchar_t));
65 return ERANGE_AND_RESET;
66 }
67 return ERANGE;
68 }
69 return memcpy_s(dest, destMax * sizeof(wchar_t), src, count * sizeof(wchar_t));
70 }
71
72