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Copies a string. These versions of strcpy, wcscpy, _mbscpy have security enhancements, as described in Security Features in the CRT.
Important
_mbscpy_s and _mbscpy_s_l cannot be used in applications that execute in the Windows Runtime. For more information, see CRT functions not supported in Universal Windows Platform apps.
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Syntax
Parameters
dest
Location of the destination string buffer.
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dest_size
Size of the destination string buffer in char units for narrow and multi-byte functions, and wchar_t units for wide functions. This value must be greater than zero and not greater than RSIZE_MAX.
src
Null-terminated source string buffer.
locale
Locale to use.
Return Value
Zero if successful; otherwise, an error.
Error Conditions
dest | dest_size | src | Return value | Contents of dest |
---|---|---|---|---|
NULL | any | any | EINVAL | not modified |
any | any | NULL | EINVAL | dest[0] set to 0 |
any | 0, or too small | any | ERANGE | dest[0] set to 0 |
Remarks
The strcpy_s function copies the contents in the address of src, including the terminating null character, to the location that's specified by dest. The destination string must be large enough to hold the source string and its terminating null character. The behavior of strcpy_s is undefined if the source and destination strings overlap.
wcscpy_s is the wide-character version of strcpy_s, and _mbscpy_s is the multibyte-character version. The arguments of wcscpy_s are wide-character strings; those of _mbscpy_s and _mbscpy_s_l are multibyte-character strings. These functions behave identically otherwise. _mbscpy_s_l is identical to _mbscpy_s except that it uses the locale parameter passed in instead of the current locale. For more information, see Locale.
If dest or src is a null pointer, or if the destination string size dest_size is too small, the invalid parameter handler is invoked, as described in Parameter Validation. If execution is allowed to continue, these functions return EINVAL and set errno to EINVAL when dest or src is a null pointer, and they return ERANGE and set errno to ERANGE when the destination string is too small.
Upon successful execution, the destination string is always null-terminated.
In C++, use of these functions is simplified by template overloads that can infer buffer length automatically so that you don't have to specify a size argument, and they can automatically replace older, less-secure functions with their newer, more 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.
Generic-Text Routine Mappings
TCHAR.H routine | _UNICODE & _MBCS not defined | _MBCS defined | _UNICODE defined |
---|---|---|---|
_tcscpy_s | strcpy_s | _mbscpy_s | wcscpy_s |
Requirements
Routine | Required header |
---|---|
strcpy_s | <string.h> |
wcscpy_s | <string.h> or <wchar.h> |
_mbscpy_s | <mbstring.h> |
These functions are Microsoft-specific. For additional compatibility information, see Compatibility.
Example
Unlike production quality code, this sample calls the secure string functions without checking for errors:
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When building C++ code, the template versions may be easier to use.
See also
String Manipulation
strcat, wcscat, _mbscat, _mbscat_l
strcmp, wcscmp, _mbscmp, _mbscmp_l
strncat_s, _strncat_s_l, wcsncat_s, _wcsncat_s_l, _mbsncat_s, _mbsncat_s_l
strncmp, wcsncmp, _mbsncmp, _mbsncmp_l
strncpy_s, _strncpy_s_l, wcsncpy_s, _wcsncpy_s_l, _mbsncpy_s, _mbsncpy_s_l
_strnicmp, _wcsnicmp, _mbsnicmp, _strnicmp_l, _wcsnicmp_l, _mbsnicmp_l
strrchr, wcsrchr, _mbsrchr, _mbsrchr_l
strspn, wcsspn, _mbsspn, _mbsspn_l
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