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1 /*
2  * Copyright (c) 2021 Huawei Device Co., Ltd.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at
6  *
7  *     http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 
16 #include "secinput.h"
17 
18 /*******************************************************************************
19  * <FUNCTION DESCRIPTION>
20  *     The vscanf_s function is equivalent to scanf_s, with the variable argument list replaced by arglist,
21  *     The vscanf_s function reads data from the standard input stream stdin and
22  *    writes the data into the location that's given by argument. Each argument
23  *    must be a pointer to a variable of a type that corresponds to a type specifier
24  *    in format. If copying occurs between strings that overlap, the behavior is
25  *    undefined.
26  *
27  * <INPUT PARAMETERS>
28  *    format                Format control string.
29  *    arglist               pointer to list of arguments
30  *
31  * <OUTPUT PARAMETERS>
32  *    arglist               the converted value stored in user assigned address
33  *
34  * <RETURN VALUE>
35  *    Returns the number of fields successfully converted and assigned;
36  *    the return value does not include fields that were read but not assigned.
37  *    A return value of 0 indicates that no fields were assigned.
38  *    return -1 if an error occurs.
39  *******************************************************************************
40  */
vscanf_s(const char * format,va_list arglist)41 int vscanf_s(const char *format, va_list arglist)
42 {
43     int retVal;                 /* If initialization causes  e838 */
44     SecFileStream fStr = SECUREC_INIT_SEC_FILE_STREAM;
45     /*
46      * "va_list" has different definition on different platform, so we can't use arglist == NULL
47      * to determine it's invalid. If you has fixed platform, you can check some fields to validate it,
48      * such as "arglist == NULL" or arglist.xxx != NULL or *(size_t *)&arglist != 0.
49      */
50     fStr.pf = stdin;
51     if (format == NULL || fStr.pf == NULL) {
52         SECUREC_ERROR_INVALID_PARAMTER("vscanf_s");
53         return SECUREC_SCANF_EINVAL;
54     }
55 
56     fStr.flag = SECUREC_FROM_STDIN_FLAG;
57 
58     SECUREC_LOCK_STDIN(0, fStr.pf);
59 
60     retVal = SecInputS(&fStr, format, arglist);
61 
62     SECUREC_UNLOCK_STDIN(0, fStr.pf);
63     if (retVal < 0) {
64         SECUREC_ERROR_INVALID_PARAMTER("vscanf_s");
65         return SECUREC_SCANF_EINVAL;
66     }
67     return retVal;
68 }
69 
70 
71