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: vscanf_s function
12 * Create: 2014-02-25
13 */
14
15 #include "secinput.h"
16
17 /*
18 * <FUNCTION DESCRIPTION>
19 * The vscanf_s function is equivalent to scanf_s, with the variable argument list replaced by argList,
20 * The vscanf_s function reads data from the standard input stream stdin and
21 * writes the data into the location that's given by argument. Each argument
22 * must be a pointer to a variable of a type that corresponds to a type specifier
23 * in format. If copying occurs between strings that overlap, the behavior is
24 * undefined.
25 *
26 * <INPUT PARAMETERS>
27 * format Format control string.
28 * argList pointer to list of arguments
29 *
30 * <OUTPUT PARAMETERS>
31 * argList the converted value stored in user assigned address
32 *
33 * <RETURN VALUE>
34 * Returns the number of fields successfully converted and assigned;
35 * the return value does not include fields that were read but not assigned.
36 * A return value of 0 indicates that no fields were assigned.
37 * return -1 if an error occurs.
38 */
vscanf_s(const char * format,va_list argList)39 int vscanf_s(const char *format, va_list argList)
40 {
41 int retVal; /* If initialization causes e838 */
42 SecFileStream fStr;
43 SECUREC_FILE_STREAM_FROM_STDIN(&fStr);
44 /*
45 * The "va_list" has different definition on different platform, so we can't use argList == NULL
46 * To determine it's invalid. If you has fixed platform, you can check some fields to validate it,
47 * such as "argList == NULL" or argList.xxx != NULL or *(size_t *)&argList != 0.
48 */
49 #if SECUREC_ENABLE_SCANF_FILE
50 if (format == NULL || fStr.pf == NULL) {
51 #else
52 if (format == NULL) {
53 #endif
54 SECUREC_ERROR_INVALID_PARAMTER("vscanf_s");
55 return SECUREC_SCANF_EINVAL;
56 }
57
58 #if SECUREC_ENABLE_SCANF_FILE
59 SECUREC_LOCK_STDIN(0, fStr.pf);
60 #endif
61 retVal = SecInputS(&fStr, format, argList);
62 #if SECUREC_ENABLE_SCANF_FILE
63 SECUREC_UNLOCK_STDIN(0, fStr.pf);
64 #endif
65 if (retVal < 0) {
66 SECUREC_ERROR_INVALID_PARAMTER("vscanf_s");
67 return SECUREC_SCANF_EINVAL;
68 }
69 return retVal;
70 }
71
72