1 /*
2 * Copyright (c) Huawei Technologies Co., Ltd. 2014-2020. 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 * Author: lishunda
13 * Create: 2014-02-25
14 */
15
16 #include "securec.h"
17
18 /*
19 * <FUNCTION DESCRIPTION>
20 * The sscanf_s function is equivalent to fscanf_s,
21 * except that input is obtained from a string (specified by the argument buffer) rather than from a stream
22 * The sscanf function reads data from buffer into the location given by each
23 * argument. Every argument must be a pointer to a variable with a type that
24 * corresponds to a type specifier in format. The format argument controls the
25 * interpretation of the input fields and has the same form and function as
26 * the format argument for the scanf function.
27 * If copying takes place between strings that overlap, the behavior is undefined.
28 *
29 * <INPUT PARAMETERS>
30 * buffer Stored data.
31 * format Format control string, see Format Specifications.
32 * ... Optional arguments.
33 *
34 * <OUTPUT PARAMETERS>
35 * ... The converted value stored in user assigned address
36 *
37 * <RETURN VALUE>
38 * Each of these functions returns the number of fields successfully converted
39 * and assigned; the return value does not include fields that were read but
40 * not assigned.
41 * A return value of 0 indicates that no fields were assigned.
42 * return -1 if an error occurs.
43 */
sscanf_s(const char * buffer,const char * format,...)44 int sscanf_s(const char *buffer, const char *format, ...)
45 {
46 int ret; /* If initialization causes e838 */
47 va_list argList;
48
49 va_start(argList, format);
50 ret = vsscanf_s(buffer, format, argList);
51 va_end(argList);
52 (void)argList; /* To clear e438 last value assigned not used , the compiler will optimize this code */
53
54 return ret;
55 }
56 #if SECUREC_IN_KERNEL
57 EXPORT_SYMBOL(sscanf_s);
58 #endif
59
60