_mbbtype, _mbbtype_l

Article
06/05/2017

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The latest version of this topic can be found at _mbbtype, _mbbtype_l.

Returns the byte type, based on the previous byte.

Important

This API cannot be used in applications that execute in the Windows Runtime. For more information, see CRT functions not supported with /ZW.

Syntax

int _mbbtype(  
   unsigned char c,  
   int type   
);  
int _mbbtype_l(  
   unsigned char c,  
   int type,  
   _locale_t locale  
);

Parameters

c
The character to test.

type
The type of byte to test for.

locale
The locale to use.

Return Value

_mbbtype returns the type of byte in a string. This decision is context-sensitive, as specified by the value of type, which provides the control test condition. type is the type of the previous byte in the string. The manifest constants in the following table are defined in Mbctype.h.

Value of `type`	`_mbbtype` tests for	Return value	`c`
Any value except 1	Valid single byte or lead byte	`_MBC_SINGLE` (0)	Single byte (0x20 – 0x7E, 0xA1 – 0xDF)
Any value except 1	Valid single byte or lead byte	`_MBC_LEAD` (1)	Lead byte of multibyte character (0x81 – 0x9F, 0xE0 – 0xFC)
Any value except 1	Valid single-byte or lead byte	`_MBC_ILLEGAL` ( –1)	Invalid character (any value except 0x20 – 0x7E, 0xA1 – 0xDF, 0x81 – 0x9F, 0xE0 – 0xFC
1	Valid trail byte	`_MBC_TRAIL` (2)	Trailing byte of multibyte character (0x40 – 0x7E, 0x80 – 0xFC)
1	Valid trail byte	`_MBC_ILLEGAL` ( –1)	Invalid character (any value except 0x20 – 0x7E, 0xA1 – 0xDF, 0x81 – 0x9F, 0xE0 – 0xFC

Remarks

The _mbbtype function determines the type of a byte in a multibyte character. If the value of type is any value except 1, _mbbtype tests for a valid single-byte or lead byte of a multibyte character. If the value of type is 1, _mbbtype tests for a valid trail byte of a multibyte character.

The output value is affected by the setting of the LC_CTYPE category setting of the locale; see setlocale, _wsetlocale for more information. The _mbbtype version of this function uses the current locale for this locale-dependent behavior; the _mbbtype_l version is identical except that it use the locale parameter that's passed in instead. For more information, see Locale.

In earlier versions, _mbbtype was named chkctype. For new code, use _mbbtype instead.

Requirements

Routine	Required header	Optional header
`_mbbtype`	<mbstring.h>	<mbctype.h>*
`_mbbtype_l`	<mbstring.h>	<mbctype.h>*

* For definitions of manifest constants that are used as return values.

For more compatibility information, see Compatibility.

.NET Framework Equivalent

Not applicable, but see System::Globalization::CultureInfo.

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