82 lines
2.3 KiB
C
82 lines
2.3 KiB
C
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/*******************************************************************************
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* Copyright @ Huawei Technologies Co., Ltd. 1998-2014. All rights reserved.
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* File name: memmove_s.c
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* History:
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* 1. Date:
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* Author:
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* Modification:
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********************************************************************************
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*/
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#include "securec.h"
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#include "securecutil.h"
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/*******************************************************************************
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* <NAME>
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* memmove_s
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*
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* <SYNOPSIS>
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* errno_t memmove_s(void *dest, size_t destMax, const void *src, size_t count);
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*
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* <FUNCTION DESCRIPTION>
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* Copies count bytes of characters from src to dest.
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*
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* <INPUT PARAMETERS>
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* dest Destination object.
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* destMax Size of the destination buffer.
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* src Source object.
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* count Number of characters to copy.
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*
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* <OUTPUT PARAMETERS>
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* dest buffer is uptdated.
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*
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* <RETURN VALUE>
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* EOK Success
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* EINVAL dest == NULL or strSrc == NULL
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* ERANGE count > destMax or destMax > SECUREC_MEM_MAX_LEN
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* or destMax == 0
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*
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* If an error occured, dest will NOT be filled with 0.
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* If some regions of the source area and the destination overlap, memmove_s
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* ensures that the original source bytes in the overlapping region are copied
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* before being overwritten.
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*******************************************************************************
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*/
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errno_t memmove_s(void *dest, size_t destMax, const void *src, size_t count)
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{
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if (destMax == 0 || destMax > SECUREC_MEM_MAX_LEN) {
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SECUREC_ERROR_INVALID_RANGE("memmove_s");
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return ERANGE;
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}
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if (dest == NULL || src == NULL) {
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SECUREC_ERROR_INVALID_PARAMTER("memmove_s");
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if (dest != NULL) {
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(void)memset(dest, 0, destMax);
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return EINVAL_AND_RESET;
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}
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return EINVAL;
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}
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if (count > destMax) {
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(void)memset(dest, 0, destMax);
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SECUREC_ERROR_INVALID_RANGE("memmove_s");
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return ERANGE_AND_RESET;
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}
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if (dest == src) {
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return EOK;
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}
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if (count > 0) {
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#ifdef CALL_LIBC_COR_API
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/*use underlying memmove for performance consideration*/
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(void)memmove(dest, src, count);
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#else
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util_memmove(dest, src, count);
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#endif
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}
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return EOK;
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}
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