iscntrl, iswcntrl, _iscntrl_l, _iswcntrl_l
Determine if an integer represents a control character.
int iscntrl(
int c
);
int iswcntrl(
wint_t c
);
int _iscntrl_l(
int c,
_locale_t locale
);
int _iswcntrl_l(
wint_t c,
_locale_t locale
);
c
Integer to testlocale
The locale to use.
Each of these routines returns nonzero if c is a particular representation of a control character. iscntrl returns a nonzero value if c is a control character (0x00 – 0x1F or 0x7F). iswcntrl returns a nonzero value if c is a control wide character. Each of these routines returns 0 if c does not satisfy the test condition.
When used with a debug CRT library, iscntrl will display a CRT assert if passed a parameter that is not EOF or in the range of 0 through 0xFF. When used with a debug CRT library, iscntrl will use the parameter as an index into an array, with undefined results if the parameter is not EOF or in the range of 0 through 0xFF.
The versions of these functions with the _l suffix are identical except that they use the locale parameter passed in instead of the current locale. For more information, see Locale.
Generic-Text Routine Mappings
TCHAR.H routine |
_UNICODE & _MBCS not defined |
_MBCS defined |
_UNICODE defined |
---|---|---|---|
_istcntrl |
iscntrl |
iscntrl |
iswcntrl |
_istcntrl_l |
_iscntrl_l |
_iscntrl_l |
_iswcntrl_l |
Routine |
Required header |
---|---|
iscntrl |
<ctype.h> |
iswcntrl |
<ctype.h> or <wchar.h> |
_iscntrl_l |
<ctype.h> |
_iswcntrl_l |
<ctype.h> or <wchar.h> |
For additional compatibility information, see Compatibility in the Introduction.