102 lines
3.8 KiB
C
102 lines
3.8 KiB
C
/*
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* Copyright (c) Huawei Technologies Co., Ltd. 2014-2018. All rights reserved.
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* Description: wcscat_s function
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* Author: lishunda
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* Create: 2014-02-25
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*/
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#include "securecutil.h"
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/*
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* Befor this function, the basic parameter checking has been done
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*/
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SECUREC_INLINE errno_t SecDoCatW(wchar_t *strDest, size_t destMax, const wchar_t *strSrc)
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{
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size_t destLen;
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size_t srcLen;
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size_t maxCount; /* Store the maximum available count */
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/* To calculate the length of a wide character, the parameter must be a wide character */
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SECUREC_CALC_WSTR_LEN(strDest, destMax, &destLen);
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maxCount = destMax - destLen;
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SECUREC_CALC_WSTR_LEN(strSrc, maxCount, &srcLen);
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if (SECUREC_CAT_STRING_IS_OVERLAP(strDest, destLen, strSrc, srcLen)) {
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strDest[0] = L'\0';
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if (strDest + destLen <= strSrc && destLen == destMax) {
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SECUREC_ERROR_INVALID_PARAMTER("wcscat_s");
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return EINVAL_AND_RESET;
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}
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SECUREC_ERROR_BUFFER_OVERLAP("wcscat_s");
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return EOVERLAP_AND_RESET;
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}
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if (srcLen + destLen >= destMax || strDest == strSrc) {
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strDest[0] = L'\0';
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if (destLen == destMax) {
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SECUREC_ERROR_INVALID_PARAMTER("wcscat_s");
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return EINVAL_AND_RESET;
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}
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SECUREC_ERROR_INVALID_RANGE("wcscat_s");
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return ERANGE_AND_RESET;
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}
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/* Copy single character length include \0 */
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SECUREC_MEMCPY_WARP_OPT(strDest + destLen, strSrc, (srcLen + 1) * sizeof(wchar_t));
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return EOK;
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}
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/*
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* <FUNCTION DESCRIPTION>
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* The wcscat_s function appends a copy of the wide string pointed to by strSrc
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* (including the terminating null wide character)
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* to the end of the wide string pointed to by strDest.
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* The arguments and return value of wcscat_s are wide-character strings.
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*
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* The wcscat_s function appends strSrc to strDest and terminates the resulting
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* string with a null character. The initial character of strSrc overwrites the
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* terminating null character of strDest. wcscat_s will return EOVERLAP_AND_RESET if the
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* source and destination strings overlap.
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*
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* Note that the second parameter is the total size of the buffer, not the
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* remaining size.
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*
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* <INPUT PARAMETERS>
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* strDest Null-terminated destination string buffer.
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* destMax Size of the destination string buffer.
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* strSrc Null-terminated source string buffer.
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*
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* <OUTPUT PARAMETERS>
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* strDest is updated
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*
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* <RETURN VALUE>
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* EOK Success
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* EINVAL strDest is NULL and destMax != 0 and destMax <= SECUREC_WCHAR_STRING_MAX_LEN
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* EINVAL_AND_RESET (strDest unterminated and all other parameters are valid) or
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* (strDest != NULL and strSrc is NULLL and destMax != 0
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* and destMax <= SECUREC_WCHAR_STRING_MAX_LEN)
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* ERANGE destMax > SECUREC_WCHAR_STRING_MAX_LEN or destMax is 0
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* ERANGE_AND_RESET strDest have not enough space and all other parameters are valid and not overlap
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* EOVERLAP_AND_RESET dest buffer and source buffer are overlapped and all parameters are valid
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*
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* If there is a runtime-constraint violation, strDest[0] will be set to the '\0' when strDest and destMax valid
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*/
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errno_t wcscat_s(wchar_t *strDest, size_t destMax, const wchar_t *strSrc)
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{
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if (destMax == 0 || destMax > SECUREC_WCHAR_STRING_MAX_LEN) {
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SECUREC_ERROR_INVALID_RANGE("wcscat_s");
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return ERANGE;
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}
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if (strDest == NULL || strSrc == NULL) {
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SECUREC_ERROR_INVALID_PARAMTER("wcscat_s");
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if (strDest != NULL) {
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strDest[0] = L'\0';
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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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return SecDoCatW(strDest, destMax, strSrc);
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}
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