116 lines
4.1 KiB
C
116 lines
4.1 KiB
C
/*
|
|
* Copyright (c) Huawei Technologies Co., Ltd. 2014-2018. All rights reserved.
|
|
* Description: strncat_s function
|
|
* Author: lishunda
|
|
* Create: 2014-02-25
|
|
*/
|
|
|
|
#include "securecutil.h"
|
|
|
|
/*
|
|
* Befor this function, the basic parameter checking has been done
|
|
*/
|
|
SECUREC_INLINE errno_t SecDoCatLimit(char *strDest, size_t destMax,
|
|
const char *strSrc, size_t count) {
|
|
size_t destLen;
|
|
size_t srcLen;
|
|
SECUREC_CALC_STR_LEN(strDest, destMax, &destLen);
|
|
/*
|
|
* The strSrc is no longer optimized. The reason is that when count is small,
|
|
* the efficiency of strnlen is higher than that of self realization.
|
|
*/
|
|
SECUREC_CALC_STR_LEN(strSrc, count, &srcLen);
|
|
|
|
if (SECUREC_CAT_STRING_IS_OVERLAP(strDest, destLen, strSrc, srcLen)) {
|
|
strDest[0] = '\0';
|
|
if (strDest + destLen <= strSrc && destLen == destMax) {
|
|
SECUREC_ERROR_INVALID_PARAMTER("strncat_s");
|
|
return EINVAL_AND_RESET;
|
|
}
|
|
SECUREC_ERROR_BUFFER_OVERLAP("strncat_s");
|
|
return EOVERLAP_AND_RESET;
|
|
}
|
|
if (srcLen + destLen >= destMax || strDest == strSrc) {
|
|
strDest[0] = '\0';
|
|
if (destLen == destMax) {
|
|
SECUREC_ERROR_INVALID_PARAMTER("strncat_s");
|
|
return EINVAL_AND_RESET;
|
|
}
|
|
SECUREC_ERROR_INVALID_RANGE("strncat_s");
|
|
return ERANGE_AND_RESET;
|
|
}
|
|
SECUREC_MEMCPY_WARP_OPT(strDest + destLen, strSrc,
|
|
srcLen); /* No terminator */
|
|
*(strDest + destLen + srcLen) = '\0';
|
|
return EOK;
|
|
}
|
|
|
|
/*
|
|
* <FUNCTION DESCRIPTION>
|
|
* The strncat_s function appends not more than n successive characters
|
|
* (not including the terminating null character)
|
|
* from the array pointed to by strSrc to the end of the string pointed to
|
|
* by strDest The strncat_s function try to append the first D characters of
|
|
* strSrc to the end of strDest, where D is the lesser of count and the length
|
|
* of strSrc. If appending those D characters will fit within strDest (whose
|
|
* size is given as destMax) and still leave room for a null terminator, then
|
|
* those characters are appended, starting at the original terminating null of
|
|
* strDest, and a new terminating null is appended; otherwise, strDest[0] is set
|
|
* to the null character.
|
|
*
|
|
* <INPUT PARAMETERS>
|
|
* strDest Null-terminated destination string.
|
|
* destMax Size of the destination buffer.
|
|
* strSrc Null-terminated source string.
|
|
* count Number of character to append, or truncate.
|
|
*
|
|
* <OUTPUT PARAMETERS>
|
|
* strDest is updated
|
|
*
|
|
* <RETURN VALUE>
|
|
* EOK Success
|
|
* EINVAL strDest is NULL and destMax != 0 and destMax <=
|
|
* SECUREC_STRING_MAX_LEN EINVAL_AND_RESET (strDest unterminated and all
|
|
* other parameters are valid)or (strDest != NULL and strSrc is NULL and
|
|
* destMax != 0 and destMax <= SECUREC_STRING_MAX_LEN) ERANGE destMax is 0 and
|
|
* destMax > SECUREC_STRING_MAX_LEN ERANGE_AND_RESET strDest have not
|
|
* enough space and all other parameters are valid and not overlap
|
|
* EOVERLAP_AND_RESET dest buffer and source buffer are overlapped and all
|
|
* parameters are valid
|
|
*
|
|
* If there is a runtime-constraint violation, strDest[0] will be set to the
|
|
* '\0' when strDest and destMax valid
|
|
*/
|
|
errno_t strncat_s(char *strDest, size_t destMax, const char *strSrc,
|
|
size_t count) {
|
|
if (destMax == 0 || destMax > SECUREC_STRING_MAX_LEN) {
|
|
SECUREC_ERROR_INVALID_RANGE("strncat_s");
|
|
return ERANGE;
|
|
}
|
|
|
|
if (strDest == NULL || strSrc == NULL) {
|
|
SECUREC_ERROR_INVALID_PARAMTER("strncat_s");
|
|
if (strDest != NULL) {
|
|
strDest[0] = '\0';
|
|
return EINVAL_AND_RESET;
|
|
}
|
|
return EINVAL;
|
|
}
|
|
if (count > SECUREC_STRING_MAX_LEN) {
|
|
#ifdef SECUREC_COMPATIBLE_WIN_FORMAT
|
|
if (count == (size_t)(-1)) {
|
|
/* Windows internal functions may pass in -1 when calling this function */
|
|
return SecDoCatLimit(strDest, destMax, strSrc, destMax);
|
|
}
|
|
#endif
|
|
strDest[0] = '\0';
|
|
SECUREC_ERROR_INVALID_RANGE("strncat_s");
|
|
return ERANGE_AND_RESET;
|
|
}
|
|
return SecDoCatLimit(strDest, destMax, strSrc, count);
|
|
}
|
|
|
|
#if SECUREC_IN_KERNEL
|
|
EXPORT_SYMBOL(strncat_s);
|
|
#endif
|