strset-strset-l-wcsset-wcsset-l-mbsset-mbsset-l.md

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Learn more about: _strset, _strset_l, _wcsset, _wcsset_l, _mbsset, _mbsset_l	_strset, _strset_l, _wcsset, _wcsset_l, _mbsset, _mbsset_l	4/2/2020	_wcsset _mbsset _strset_l _strset _wcsset_l _mbsset_l _o__mbsset _o__mbsset_l _o__wcsset	msvcrt.dll msvcr80.dll msvcr90.dll msvcr100.dll msvcr100_clr0400.dll msvcr110.dll msvcr110_clr0400.dll msvcr120.dll msvcr120_clr0400.dll ucrtbase.dll api-ms-win-crt-multibyte-l1-1-0.dll api-ms-win-crt-string-l1-1-0.dll ntoskrnl.exe	DLLExport	apiref	mbsset _strset_l _mbsset _strset mbsset_l strset_l _wcsset _ftcsset wcsset_l _tcsset_l _mbsset_l _wcsset_l _fstrset _tcsset	_wcsset_l function _tcsset function wcsset_l function _ftcsset function characters [C++], setting _strset function ftcsset function strings [C++], setting characters mbsset function tcsset_l function _fstrset function mbsset_l function strset_l function _wcsset function _mbsset function _mbsset_l function tcsset function _strset_l function fstrset function _tcsset_l function	c42ded42-2ed9-4f06-a0a9-247ba305473a

_strset, _strset_l, _wcsset, _wcsset_l, _mbsset, _mbsset_l

Sets characters of a string to a character. More secure versions of these functions are available; see _strset_s, _strset_s_l, _wcsset_s, _wcsset_s_l, _mbsset_s, _mbsset_s_l.

Important

_mbsset and _mbsset_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.

Syntax

char *_strset(
   char *str,
   int c
);
char *_strset_l(
   char *str,
   int c,
   _locale_t locale
);
wchar_t *_wcsset(
   wchar_t *str,
   wchar_t c
);
wchar_t *_wcsset_l(
   wchar_t *str,
   wchar_t c,
   _locale_t locale
);
unsigned char *_mbsset(
   unsigned char *str,
   unsigned int c
);
unsigned char *_mbsset_l(
   unsigned char *str,
   unsigned int c,
   _locale_t locale
);

Parameters

str
Null-terminated string to be set.

c
Character setting.

locale
Locale to use.

Return value

Returns a pointer to the altered string.

Remarks

The _strset function sets all characters (except the terminating null character) of str to c, converted to char. _wcsset and _mbsset_l are wide-character and multibyte-character versions of _strset, and the data types of the arguments and return values vary accordingly. These functions behave identically otherwise.

_mbsset validates its parameters. If str is a null pointer, the invalid parameter handler is invoked, as described in Parameter validation. If execution is allowed to continue, _mbsset returns NULL and sets errno to EINVAL. _strset and _wcsset don't validate their parameters.

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 are identical, except that the ones that don't have the _l suffix use the current locale and the ones that do have the _l suffix instead use the locale parameter that's passed in. For more information, see Locale.

Important

These functions might be vulnerable to buffer overrun threats. Buffer overruns can be used for system attacks because they can cause an unwarranted elevation of privilege. For more information, see Avoiding buffer overruns.

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

TCHAR.H routine	_UNICODE and _MBCS not defined	_MBCS defined	_UNICODE defined
_tcsset	_strset	_mbsset	_wcsset
_tcsset_l	_strset_l	_mbsset_l	_wcsset_l

Requirements

Routine	Required header
_strset	<string.h>
_strset_l	<tchar.h>
_wcsset	<string.h> or <wchar.h>
_wcsset_l	<tchar.h>
_mbsset, _mbsset_l	<mbstring.h>

For more compatibility information, see Compatibility.

Example

// crt_strset.c
// compile with: /W3

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

int main( void )
{
   char string[] = "Fill the string with something.";
   printf( "Before: %s\n", string );
   _strset( string, '*' ); // C4996
   // Note: _strset is deprecated; consider using _strset_s instead
   printf( "After:  %s\n", string );
}

Before: Fill the string with something.
After:  *******************************

See also

String manipulation
Locale
Interpretation of multibyte-character sequences
_mbsnbset, _mbsnbset_l
memset, wmemset
strcat, wcscat, _mbscat
strcmp, wcscmp, _mbscmp
strcpy, wcscpy, _mbscpy
_strnset, _strnset_l, _wcsnset, _wcsnset_l, _mbsnset, _mbsnset_l