113 lines
4.3 KiB
C
113 lines
4.3 KiB
C
/*
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* Copyright (c) Huawei Technologies Co., Ltd. 2014-2018. All rights reserved.
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* Description: strncat_s function
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* Author: Hisilicon
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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 SecDoCatLimit(char *strDest, size_t destMax, const char *strSrc, size_t count)
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{
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size_t destLen;
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size_t srcLen;
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SECUREC_CALC_STR_LEN(strDest, destMax, &destLen);
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/*
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* The strSrc is no longer optimized. The reason is that when count is small,
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* the efficiency of strnlen is higher than that of self realization.
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*/
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SECUREC_CALC_STR_LEN(strSrc, count, &srcLen);
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if (SECUREC_CAT_STRING_IS_OVERLAP(strDest, destLen, strSrc, srcLen)) {
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strDest[0] = '\0';
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if (strDest + destLen <= strSrc && destLen == destMax) {
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SECUREC_ERROR_INVALID_PARAMTER("strncat_s");
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return EINVAL_AND_RESET;
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}
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SECUREC_ERROR_BUFFER_OVERLAP("strncat_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] = '\0';
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if (destLen == destMax) {
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SECUREC_ERROR_INVALID_PARAMTER("strncat_s");
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return EINVAL_AND_RESET;
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}
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SECUREC_ERROR_INVALID_RANGE("strncat_s");
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return ERANGE_AND_RESET;
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}
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SECUREC_MEMCPY_WARP_OPT(strDest + destLen, strSrc, srcLen); /* No terminator */
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*(strDest + destLen + srcLen) = '\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 strncat_s function appends not more than n successive characters
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* (not including the terminating null character)
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* from the array pointed to by strSrc to the end of the string pointed to by strDest
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* The strncat_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 strSrc.
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* If appending those D characters will fit within strDest (whose size is given
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* as destMax) and still leave room for a null terminator, then those characters
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* are appended, starting at the original terminating null of strDest, and a
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* new terminating null is appended; otherwise, strDest[0] is set to the null
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* 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 <= SECUREC_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 NULL and destMax != 0 and destMax <= SECUREC_STRING_MAX_LEN)
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* ERANGE destMax is 0 and destMax > SECUREC_STRING_MAX_LEN
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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 strncat_s(char *strDest, size_t destMax, const char *strSrc, size_t count)
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{
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if (destMax == 0 || destMax > SECUREC_STRING_MAX_LEN) {
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SECUREC_ERROR_INVALID_RANGE("strncat_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("strncat_s");
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if (strDest != NULL) {
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strDest[0] = '\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_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 SecDoCatLimit(strDest, destMax, strSrc, destMax);
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}
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#endif
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strDest[0] = '\0';
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SECUREC_ERROR_INVALID_RANGE("strncat_s");
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return ERANGE_AND_RESET;
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}
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return SecDoCatLimit(strDest, destMax, strSrc, count);
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}
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#if SECUREC_IN_KERNEL
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EXPORT_SYMBOL(strncat_s);
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#endif
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