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strcpy_s, wcscpy_s, _mbscpy_s

Copy a string. These are versions of strcpy, wcscpy, _mbscpy with security enhancements as described in Security Enhancements in the CRT.


errno_t strcpy_s(
   char *strDestination,
   size_t numberOfElements,
   const char *strSource 
);
errno_t wcscpy_s(
   wchar_t *strDestination,
   size_t numberOfElements,
   const wchar_t *strSource 
);
errno_t _mbscpy_s(
   unsigned char *strDestination,
   size_t numberOfElements,
   const unsigned char *strSource 
);
template <size_t size>
errno_t strcpy_s(
   char (&strDestination)[size],
   const char *strSource 
); // C++ only
template <size_t size>
errno_t wcscpy_s(
   wchar_t (&strDestination)[size],
   const wchar_t *strSource 
); // C++ only
template <size_t size>
errno_t _mbscpy_s(
   unsigned char (&strDestination)[size],
   const unsigned char *strSource 
); // C++ only

strDestination

Location of destination string buffer

numberOfElements

Size of the destination string buffer.

strSource

Null-terminated source string buffer.

Zero if successful; an error otherwise.

Error Conditions

strDestination

numberOfElements

strSource

Return value

Contents of strDestination

NULL

any

any

EINVAL

not modified

any

any

NULL

EINVAL

strDestination[0] set to 0

any

0, or too small

any

ERANGE

strDestination[0] set to 0

The strcpy_s function copies the contents in the address of strSource, including the terminating null character, to the location specified by strDestination. The destination string must be large enough to hold the source string, including the terminating null character. The behavior of strcpy_s is undefined if the source and destination strings overlap.

wcscpy_s and _mbscpy_s are wide-character and multibyte-character versions of strcpy_s respectively. The arguments and return value of wcscpy_s are wide character strings; those of _mbscpy_s are multibyte character strings. These three functions behave identically otherwise.

If strDestination or strSource is a null pointer, or if the destination string 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.

Upon successful execution, the destination string will always be null terminated.

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 versions of these functions first fill the buffer with 0xFD. 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

Routine

Required header

strcpy_s

<string.h>

wcscpy_s

<string.h> or <wchar.h>

_mbscpy_s

<mbstring.h>

For additional compatibility information, see Compatibility in the Introduction.

// crt_strcpy_s.cpp
// This program uses strcpy_s and strcat_s
// to build a phrase.
//

#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>

int main( void )
{
   char string[80];
   // using template versions of strcpy_s and strcat_s:
   strcpy_s( string, "Hello world from " );
   strcat_s( string, "strcpy_s " );
   strcat_s( string, "and " );
   // of course we can supply the size explicitly if we want to:
   strcat_s( string, _countof(string), "strcat_s!" );
   
   printf( "String = %s\n", string );
}
String = Hello world from strcpy_s and strcat_s!

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