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: vswscanf_s function
12 * Create: 2014-02-25
13 */
14
15 #ifndef SECUREC_FOR_WCHAR
16 #define SECUREC_FOR_WCHAR
17 #endif
18
19 #include "secinput.h"
20
SecWcslen(const wchar_t * s)21 SECUREC_INLINE size_t SecWcslen(const wchar_t *s)
22 {
23 const wchar_t *end = s;
24 while (*end != L'\0') {
25 ++end;
26 }
27 return ((size_t)((end - s)));
28 }
29
30 /*
31 * <FUNCTION DESCRIPTION>
32 * The vswscanf_s function is the wide-character equivalent of the vsscanf_s function
33 * The vsscanf_s function reads data from buffer into the location given by
34 * each argument. Every argument must be a pointer to a variable with a type
35 * that corresponds to a type specifier in format.
36 * The format argument controls the interpretation of the input fields and
37 * has the same form and function as the format argument for the scanf function.
38 * If copying takes place between strings that overlap, the behavior is undefined.
39 *
40 * <INPUT PARAMETERS>
41 * buffer Stored data
42 * format Format control string, see Format Specifications.
43 * argList pointer to list of arguments
44 *
45 * <OUTPUT PARAMETERS>
46 * argList the converted value stored in user assigned address
47 *
48 * <RETURN VALUE>
49 * Each of these functions returns the number of fields successfully converted
50 * and assigned; the return value does not include fields that were read but
51 * not assigned. A return value of 0 indicates that no fields were assigned.
52 * return -1 if an error occurs.
53 */
vswscanf_s(const wchar_t * buffer,const wchar_t * format,va_list argList)54 int vswscanf_s(const wchar_t *buffer, const wchar_t *format, va_list argList)
55 {
56 size_t count; /* If initialization causes e838 */
57 SecFileStream fStr;
58 int retVal;
59
60 /* Validation section */
61 if (buffer == NULL || format == NULL) {
62 SECUREC_ERROR_INVALID_PARAMTER("vswscanf_s");
63 return SECUREC_SCANF_EINVAL;
64 }
65 count = SecWcslen(buffer);
66 if (count == 0 || count > SECUREC_WCHAR_STRING_MAX_LEN) {
67 SecClearDestBufW(buffer, format, argList);
68 SECUREC_ERROR_INVALID_PARAMTER("vswscanf_s");
69 return SECUREC_SCANF_EINVAL;
70 }
71 SECUREC_FILE_STREAM_FROM_STRING(&fStr, (const char *)buffer, count * sizeof(wchar_t));
72 retVal = SecInputSW(&fStr, format, argList);
73 if (retVal < 0) {
74 SECUREC_ERROR_INVALID_PARAMTER("vswscanf_s");
75 return SECUREC_SCANF_EINVAL;
76 }
77 return retVal;
78 }
79
80