_mbsnbcpy_s, _mbsnbcpy_s_l

Copies n bytes of a string to a destination string. These versions of _mbsnbcpy, _mbsnbcpy_l have security enhancements, as described in Security features in the CRT.

Syntax

errno_t _mbsnbcpy_s(
   unsigned char * strDest,
   size_t sizeInBytes,
   const unsigned char * strSource,
   size_t count
);
errno_t _mbsnbcpy_s_l(
   unsigned char * strDest,
   size_t sizeInBytes,
   const unsigned char * strSource,
   size_t count,
   _locale_t locale
);
template <size_t size>
errno_t _mbsnbcpy_s(
   unsigned char (&strDest)[size],
   const unsigned char * strSource,
   size_t count
); // C++ only
template <size_t size>
errno_t _mbsnbcpy_s_l(
   unsigned char (&strDest)[size],
   const unsigned char * strSource,
   size_t count,
   _locale_t locale
); // C++ only

Parameters

strDest
Destination for character string to be copied.

sizeInBytes
Destination buffer size.

strSource
Character string to be copied.

count
Number of bytes to be copied.

locale
Locale to use.

Return value

Zero if successful; EINVAL if a bad parameter was passed in.

Remarks

The _mbsnbcpy_s function copies count bytes from strSource to strDest. If count exceeds the size of strDest, either of the input strings is a null pointer, or sizeInBytes or count is 0, the function invokes the invalid parameter handler as described in Parameter validation . If execution is allowed to continue, the function returns EINVAL. If the source and destination strings overlap, the behavior of _mbsnbcpy_s is undefined.

The output value is affected by the setting of the LC_CTYPE category setting of the locale. For more information, see setlocale. The versions of these functions without the _l suffix use the current locale for this locale-dependent behavior; the versions with the _l suffix are identical except that they use the locale parameter passed in instead. For more information, see Locale.

In C++, using these functions is simplified by template overloads; the overloads can infer buffer length automatically (eliminating the need to specify a size argument) and they can automatically replace older, non-secure functions with their newer, secure counterparts. For more information, see Secure template overloads.

The debug library versions of these functions first fill the buffer with 0xFE. To disable this behavior, use _CrtSetDebugFillThreshold.

By default, this function's global state is scoped to the application. To change this behavior, see Global state in the CRT.

Generic-text routine mappings

Requirements

For more compatibility information, see Compatibility.

See also

String manipulation
_mbsnbcat, _mbsnbcat_l
_mbsnbcmp, _mbsnbcmp_l
_strncnt, _wcsncnt, _mbsnbcnt, _mbsnbcnt_l, _mbsnccnt, _mbsnccnt_l
_mbsnbicmp, _mbsnbicmp_l
_mbsnbset, _mbsnbset_l
strncpy, _strncpy_l, wcsncpy, _wcsncpy_l, _mbsncpy, _mbsncpy_l