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: sscanf_s function
12 * Create: 2014-02-25
13 */
14
15 #include "securec.h"
16
17 /*
18 * <FUNCTION DESCRIPTION>
19 * The sscanf_s function is equivalent to fscanf_s,
20 * except that input is obtained from a string (specified by the argument buffer) rather than from a stream
21 * The sscanf function reads data from buffer into the location given by each
22 * argument. Every argument must be a pointer to a variable with a type that
23 * corresponds to a type specifier in format. The format argument controls the
24 * interpretation of the input fields and has the same form and function as
25 * the format argument for the scanf function.
26 * If copying takes place between strings that overlap, the behavior is undefined.
27 *
28 * <INPUT PARAMETERS>
29 * buffer Stored data.
30 * format Format control string, see Format Specifications.
31 * ... Optional arguments.
32 *
33 * <OUTPUT PARAMETERS>
34 * ... The converted value stored in user assigned address
35 *
36 * <RETURN VALUE>
37 * Each of these functions returns the number of fields successfully converted
38 * and assigned; the return value does not include fields that were read but
39 * not assigned.
40 * A return value of 0 indicates that no fields were assigned.
41 * return -1 if an error occurs.
42 */
sscanf_s(const char * buffer,const char * format,...)43 int sscanf_s(const char *buffer, const char *format, ...)
44 {
45 int ret; /* If initialization causes e838 */
46 va_list argList;
47
48 va_start(argList, format);
49 ret = vsscanf_s(buffer, format, argList);
50 va_end(argList);
51 (void)argList; /* To clear e438 last value assigned not used , the compiler will optimize this code */
52
53 return ret;
54 }
55 #if SECUREC_EXPORT_KERNEL_SYMBOL
56 EXPORT_SYMBOL(sscanf_s);
57 #endif
58
59