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isspace, iswspace, _ismbcspace

Header File

ctype.h, wctype.h, mbstring.h

Category

Classification Routines

Prototype

int isspace(int c);

int iswspace(wint_t c);

int _ismbcspace(unsigned int c);

Description

Tests for space character.

isspace is a macro that classifies ASCII-coded integer values by table lookup. The macro is affected by the current locale’s LC_CTYPE category.

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

Return Value

isspace returns nonzero if c is a space, tab, carriage return, new line, vertical tab, formfeed (0x09 to 0x0D, 0x20), or any other locale-defined space character.

Example

Copy Code

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

Portability

| POSIX | Win32 | ANSI C | ANSI C++
isspace | + | + | + | +
_ismbcspace |  | + |  |
iswspace |  | + | + | +

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