xref: /third_party/bounds_checking_function/src/sprintf_s.c

/*
 * Copyright (c) Huawei Technologies Co., Ltd. 2014-2021. All rights reserved.
 * Licensed under Mulan PSL v2.
 * You can use this software according to the terms and conditions of the Mulan PSL v2.
 * You may obtain a copy of Mulan PSL v2 at:
 *          http://license.coscl.org.cn/MulanPSL2
 * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
 * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
 * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
 * See the Mulan PSL v2 for more details.
 * Description: sprintf_s  function
 * Create: 2014-02-25
 */

#include "securec.h"

/*
 * <FUNCTION DESCRIPTION>
 *    The sprintf_s function is equivalent to the sprintf function
 *    except for the parameter destMax and the explicit runtime-constraints violation
 *    The sprintf_s function formats and stores a series of characters and values
 *    in strDest. Each argument (if any) is converted and output according to
 *    the corresponding format specification in format. The format consists of
 *    ordinary characters and has the same form and function as the format argument
 *    for printf. A null character is appended after the last character written.
 *    If copying occurs between strings that overlap, the behavior is undefined.
 *
 * <INPUT PARAMETERS>
 *    strDest                 Storage location for output.
 *    destMax                Maximum number of characters to store.
 *    format                  Format-control string.
 *    ...                        Optional arguments
 *
 * <OUTPUT PARAMETERS>
 *    strDest                 is updated
 *
 * <RETURN VALUE>
 *    return the number of bytes stored in strDest, not counting the terminating null character.
 *    return -1 if an error occurred.
 *
 * If there is a runtime-constraint violation, strDest[0] will be set to the '\0' when strDest and destMax valid
 */
int sprintf_s(char *strDest, size_t destMax, const char *format, ...)
{
    int ret;                    /* If initialization causes  e838 */
    va_list argList;

    va_start(argList, format);
    ret = vsprintf_s(strDest, destMax, 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_EXPORT_KERNEL_SYMBOL
EXPORT_SYMBOL(sprintf_s);
#endif