/**
 * Copyright 2020 Huawei Technologies Co., Ltd
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "securec.h"

/*
 * <FUNCTION DESCRIPTION>
 *    The sscanf_s function is equivalent to fscanf_s,
 *     except that input is obtained from a string (specified by the argument buffer) rather than from a stream
 *    The sscanf function reads data from buffer into the location given by each
 *    argument. Every argument must be a pointer to a variable with a type that
 *    corresponds to a type specifier in format. The format argument controls the
 *    interpretation of the input fields and has the same form and function as
 *    the format argument for the scanf function.
 *    If copying takes place between strings that overlap, the behavior is undefined.
 *
 * <INPUT PARAMETERS>
 *    buffer                 Stored data.
 *    format                 Format control string, see Format Specifications.
 *    ...                    Optional arguments.
 *
 * <OUTPUT PARAMETERS>
 *    ...                    The converted value stored in user assigned address
 *
 * <RETURN VALUE>
 *    Each of these functions returns the number of fields successfully converted
 *    and assigned; the return value does not include fields that were read but
 *    not assigned.
 *    A return value of 0 indicates that no fields were assigned.
 *    return -1 if an error occurs.
 */
int sscanf_s(const char *buffer, const char *format, ...)
{
    int ret;                    /* If initialization causes  e838 */
    va_list argList;

    va_start(argList, format);
    ret = vsscanf_s(buffer, format, argList);
    va_end(argList);
    (void)argList;              /* to clear e438 last value assigned not used , the compiler will optimize this code */

    return ret;
}
#if SECUREC_IN_KERNEL
EXPORT_SYMBOL(sscanf_s);
#endif