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: scanf_s function
12 * Create: 2014-02-25
13 */
14
15 #include "securec.h"
16
17 /*
18 * <FUNCTION DESCRIPTION>
19 * The scanf_s function is equivalent to fscanf_s with the argument stdin interposed before the arguments to scanf_s
20 * The scanf_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 * ... Optional arguments.
29 *
30 * <OUTPUT PARAMETERS>
31 * ... 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 */
scanf_s(const char * format,...)39 int scanf_s(const char *format, ...)
40 {
41 int ret; /* If initialization causes e838 */
42 va_list argList;
43
44 va_start(argList, format);
45 ret = vscanf_s(format, argList);
46 va_end(argList);
47 (void)argList; /* To clear e438 last value assigned not used , the compiler will optimize this code */
48
49 return ret;
50 }
51
52