iscntrl, iswcntrl, _iscntrl_l, _iswcntrl_l
Determines whether an integer represents a control character.
Syntax
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
);
Parameters
c
Integer to test
locale
The locale to use.
Return value
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 doesn't satisfy the test condition.
The versions of these functions that have the _l suffix use the locale parameter that's passed in instead of the current locale. For more information, see Locale.
The behavior of iscntrl and _iscntrl_l is undefined if c isn't EOF or in the range 0 through 0xFF, inclusive. When a debug CRT library is used and c isn't one of these values, the functions raise an assertion.
Generic-text routine mappings
| TCHAR.H routine | _UNICODE and _MBCS not defined |
_MBCS defined |
_UNICODE defined |
|---|---|---|---|
_istcntrl |
iscntrl |
iscntrl |
iswcntrl |
_istcntrl_l |
_iscntrl_l |
_iscntrl_l |
_iswcntrl_l |
Remarks
By default, this function's global state is scoped to the application. To change this behavior, see Global state in the CRT.
Requirements
| Routine | Required header |
|---|---|
iscntrl |
<ctype.h> |
iswcntrl |
<ctype.h> or <wchar.h> |
_iscntrl_l |
<ctype.h> |
_iswcntrl_l |
<ctype.h> or <wchar.h> |
For more compatibility information, see Compatibility.