Name

The iswspace() function tests whether ’wch’ is a wide-character that introduces white-space.

The following are such characters in the POSIX locale:

SPACE

FORM-FEED

NEWLINE

CARRIAGE-RETURN

TAB

VERTICAL-TAB

The result of this function is undefined unless the argument is WEOF or a valid wchar_t value.

The functionality of this API is independent of the program’s current locale and so it returns non-zero for all the characters (of various locales supported) that belong to the class space, irrespective of the locale they belong to.

#include<wctype.h> //iswspace()
#include<stdio.h> //printf()
int test_iswspace()
{
   int arr[]={’\n’,’0’,’w’,’R’,0x3000,’ ’, 0x000A, 0x002};
   int i = 0;
   int size = 8;
   for( i=0; i<size; i++)
   {
     int ret = iswspace(arr[i]); //call to the API with chars in arr[]
     if( (!ret) != 0 )
     {
        printf("\n%lc is not wide space ", arr[i]);
     }
     else
     {
        printf("\n%lc is wide space", arr[i]);
     }
   }
printf("\n");
}

Output

is wide space
0 is not wide space
w is not wide space
R is not wide space
กก is wide space
  is wide space
 is wide space
 is wide space

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