64 lines
2.5 KiB
C
64 lines
2.5 KiB
C
/*
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* Copyright (c) Huawei Technologies Co., Ltd. 2014-2018. All rights reserved.
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* Description: wmemmove_s function
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* Author: lishunda
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* Create: 2014-02-25
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*/
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/*
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* [Standardize-exceptions] Use unsafe function: Portability
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* [reason] Use unsafe function to implement security function to maintain platform compatibility.
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* And sufficient input validation is performed before calling
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*/
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#include "securecutil.h"
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/*
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* <FUNCTION DESCRIPTION>
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* The wmemmove_s function copies n successive wide characters from the object pointed
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* to by src into the object pointed to by dest.
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*
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* <INPUT PARAMETERS>
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* dest Destination buffer.
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* destMax Size of the destination buffer.
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* src Source object.
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* count Number of bytes or character to copy.
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*
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* <OUTPUT PARAMETERS>
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* dest is updated.
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*
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* <RETURN VALUE>
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* EOK Success
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* EINVAL dest is NULL and destMax != 0 and count <= destMax
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* and destMax <= SECUREC_WCHAR_MEM_MAX_LEN
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* EINVAL_AND_RESET dest != NULL and src is NULLL and destMax != 0
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* and destMax <= SECUREC_WCHAR_MEM_MAX_LEN and count <= destMax
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* ERANGE destMax > SECUREC_WCHAR_MEM_MAX_LEN or destMax is 0 or
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* (count > destMax and dest is NULL and destMax != 0
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* and destMax <= SECUREC_WCHAR_MEM_MAX_LEN)
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* ERANGE_AND_RESET count > destMax and dest != NULL and destMax != 0
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* and destMax <= SECUREC_WCHAR_MEM_MAX_LEN
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*
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*
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* If an error occured, dest will be filled with 0 when dest and destMax valid.
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* If some regions of the source area and the destination overlap, wmemmove_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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errno_t wmemmove_s(wchar_t *dest, size_t destMax, const wchar_t *src, size_t count)
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{
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if (destMax == 0 || destMax > SECUREC_WCHAR_MEM_MAX_LEN) {
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SECUREC_ERROR_INVALID_PARAMTER("wmemmove_s");
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return ERANGE;
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}
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if (count > destMax) {
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SECUREC_ERROR_INVALID_PARAMTER("wmemmove_s");
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if (dest != NULL) {
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(void)memset(dest, 0, destMax * sizeof(wchar_t));
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return ERANGE_AND_RESET;
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}
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return ERANGE;
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}
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return memmove_s(dest, destMax * sizeof(wchar_t), src, count * sizeof(wchar_t));
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}
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