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iscntrl, iswcntrl

Header File

ctype.h

Category

Classification Routines

Prototype

int iscntrl(int c);

int iswcntrl(wint_t c);

Description

Tests for a control character.

iscntrl is a macro that classifies ASCII-coded integer values by table lookup. The macro is affected by the current locale’s LC_CTYPE category. For the default C locale, c is a delete character or control character (0x7F or 0x00 to 0x1F).

You can make this macro available as a function by undefining (#undef) it.

Return Value

iscntrl returns nonzero if c is a delete character or ordinary control character.

Example

Copy Code

    #include <stdio.h>
    #include <ctype.h>
    int main(void)
    {
      char c = 'C';
      if (iscntrl(c))
        printf("%c is a control character\n",c);
      else
        printf("%c is not a control character\n",c);
      return 0;
    }

Portability

| POSIX | Win32 | ANSI C | ANSI C++
iscntrl | + | + | + | +
iswcntrl |  | + | + | +

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