isspace, iswspace, _ismbcspace

Go Up to ctype.h Index

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

#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		+	+	+