111 lines
4.1 KiB
C
111 lines
4.1 KiB
C
/*
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* Copyright (c) Huawei Technologies Co., Ltd. 2014-2018. All rights reserved.
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* Description: wcsncat_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 SecDoCatLimitW(wchar_t *strDest, size_t destMax,
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const wchar_t *strSrc, size_t count) {
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/* To calculate the length of a wide character, the parameter must be a wide
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* character */
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size_t destLen;
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size_t srcLen;
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SECUREC_CALC_WSTR_LEN(strDest, destMax, &destLen);
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SECUREC_CALC_WSTR_LEN(strSrc, count, &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("wcsncat_s");
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return EINVAL_AND_RESET;
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}
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SECUREC_ERROR_BUFFER_OVERLAP("wcsncat_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("wcsncat_s");
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return EINVAL_AND_RESET;
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}
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SECUREC_ERROR_INVALID_RANGE("wcsncat_s");
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return ERANGE_AND_RESET;
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}
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SECUREC_MEMCPY_WARP_OPT(strDest + destLen, strSrc,
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srcLen * sizeof(wchar_t)); /* no terminator */
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*(strDest + destLen + srcLen) = L'\0';
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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 wcsncat_s function appends not more than n successive wide characters
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* (not including the terminating null wide character)
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* from the array pointed to by strSrc to the end of the wide string pointed
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* to by strDest.
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*
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* The wcsncat_s function try to append the first D characters of strSrc to
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* the end of strDest, where D is the lesser of count and the length of
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* strSrc. If appending those D characters will fit within strDest (whose size
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* is given as destMax) and still leave room for a null terminator, then those
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* characters are appended, starting at the original terminating null of
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* strDest, and a new terminating null is appended; otherwise, strDest[0] is
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* set to the null character.
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*
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* <INPUT PARAMETERS>
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* strDest Null-terminated destination string.
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* destMax Size of the destination buffer.
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* strSrc Null-terminated source string.
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* count Number of character to append, or truncate.
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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 <=
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* SECUREC_WCHAR_STRING_MAX_LEN EINVAL_AND_RESET (strDest unterminated and
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* all other parameters are valid) or (strDest != NULL and strSrc is NULLL and
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* destMax != 0 and destMax <= SECUREC_WCHAR_STRING_MAX_LEN) ERANGE destMax >
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* SECUREC_WCHAR_STRING_MAX_LEN or destMax is 0 ERANGE_AND_RESET strDest
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* 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
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* 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
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* '\0' when strDest and destMax valid
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*/
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errno_t wcsncat_s(wchar_t *strDest, size_t destMax, const wchar_t *strSrc,
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size_t count) {
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if (destMax == 0 || destMax > SECUREC_WCHAR_STRING_MAX_LEN) {
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SECUREC_ERROR_INVALID_RANGE("wcsncat_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("wcsncat_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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if (count > SECUREC_WCHAR_STRING_MAX_LEN) {
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#ifdef SECUREC_COMPATIBLE_WIN_FORMAT
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if (count == ((size_t)-1)) {
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/* Windows internal functions may pass in -1 when calling this function */
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return SecDoCatLimitW(strDest, destMax, strSrc, destMax);
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}
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#endif
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strDest[0] = L'\0';
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SECUREC_ERROR_INVALID_RANGE("wcsncat_s");
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return ERANGE_AND_RESET;
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}
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return SecDoCatLimitW(strDest, destMax, strSrc, count);
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}
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