_mbsnbset
, _mbsnbset_l
Sets the first n bytes of a multibyte-character string to a specified character. More secure versions of these functions are available; see _mbsnbset_s
, _mbsnbset_s_l
.
Important
This API 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
unsigned char *_mbsnbset(
unsigned char *str,
unsigned int c,
size_t count
);
unsigned char *_mbsnbset_l(
unsigned char *str,
unsigned int c,
size_t count,
_locale_t locale
);
Parameters
str
String to be altered.
c
Single-byte or multibyte-character setting.
count
Number of bytes to be set.
locale
Locale to use.
Return value
_mbsnbset
returns a pointer to the altered string.
Remarks
The _mbsnbset
and _mbsnbset_l
functions set, at most, the first count
bytes of str
to c
. If count
is greater than the length of str
, the length of str
is used instead of count
. If c
is a multibyte character and can't be set entirely into the last byte specified by count
, the last byte is padded with a blank character. _mbsnbset
and _mbsnbset_l
doesn't place a terminating null at the end of str
.
_mbsnbset
and _mbsnbset_l
is similar to _mbsnset
, except that it sets count
bytes rather than count
characters of c
.
If str
is NULL
or count
is zero, this function generates an invalid parameter exception as described in Parameter validation. If execution is allowed to continue, errno
is set to EINVAL
and the function returns NULL
. Also, if c
isn't a valid multibyte character, errno
is set to EINVAL
and a space is used instead.
The output value is affected by the setting of the LC_CTYPE
category setting of the locale. For more information, see setlocale
. The _mbsnbset
version of this function uses the current locale for this locale-dependent behavior; the _mbsnbset_l
version is identical except that it uses the locale parameter passed in instead. For more information, see Locale.
Security Note This API incurs a potential threat brought about by a buffer overrun problem. Buffer overrun problems are a frequent method of system attack, resulting in 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 |
---|---|---|---|
_tcsnset |
_strnset |
_mbsnbset |
_wcsnset |
_tcsnset_l |
_strnset_l |
_mbsnbset_l |
_wcsnset_l |
Requirements
Routine | Required header |
---|---|
_mbsnbset |
<mbstring.h> |
_mbsnbset_l |
<mbstring.h> |
For more compatibility information, see Compatibility.
Example
// crt_mbsnbset.c
// compile with: /W3
#include <mbstring.h>
#include <stdio.h>
int main( void )
{
char string[15] = "This is a test";
/* Set not more than 4 bytes of string to be *'s */
printf( "Before: %s\n", string );
_mbsnbset( string, '*', 4 ); // C4996
// Note; _mbsnbset is deprecated; consider _mbsnbset_s
printf( "After: %s\n", string );
}
Output
Before: This is a test
After: **** is a test
See also
String manipulation
_mbsnbcat
, _mbsnbcat_l
_strnset
, _strnset_l
, _wcsnset
, _wcsnset_l
, _mbsnset
, _mbsnset_l
_strset
, _strset_l
, _wcsset
, _wcsset_l
, _mbsset
, _mbsset_l
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