isleadbyte
int isleadbyte( int c );
Parameter
- c
- Integer to test.
Return Value
isleadbyte returns a nonzero value if the argument satisfies the test condition or 0 if it does not. In the "C" locale and in single-byte character set (SBCS) locales, isleadbyte always returns 0.
Remarks
The isleadbyte macro returns a nonzero value if its argument is the first byte of a multibyte character. isleadbyte produces a meaningful result for any integer argument from –1 (EOF) to UCHAR_MAX (0xFF), inclusive. The result of the test depends upon the LC_CTYPE category setting of the current locale; see setlocale for more information.
The expected argument type of isleadbyte is int; if a signed character is passed, the compiler may convert it to an integer by sign extension, yielding unpredictable results.
Generic-Text Routine Mappings
| TCHAR.H routine | _UNICODE & _MBCS not defined | _MBCS defined | _UNICODE defined |
|---|---|---|---|
| _istleadbyte | Always returns false | _isleadbyte | Always returns false |
Requirements
| Routine | Required header | Compatibility |
|---|---|---|
| isleadbyte | <ctype.h> | ANSI, Win 98, Win Me, Win NT, Win 2000, Win XP |
For additional compatibility information, see Compatibility in the Introduction.
Libraries
All versions of the C run-time libraries.
See Also
Byte Classification Routines | Locale Routines | _ismbb Routines | Run-Time Routines and .NET Framework Equivalents
