isblank
Header: <ctype.h>
Checks if the given character is a blank character in the current C locale. In the default C locale, only space (0x20) and horizontal tab (0x09) are classified as blank.
# Declarations
int isblank( int ch );
(since C99)
# Parameters
ch: character to classify
# Return value
Non-zero value if the character is a blank character, zero otherwise.
# Example
#include <stdio.h>
#include <ctype.h>
#include <limits.h>
int main(void)
{
for (int ndx=0; ndx<=UCHAR_MAX; ndx++)
if (isblank(ndx)) printf("0x%02x\n", ndx);
}