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ISSPACE(3) Library Functions Manual ISSPACE(3)

isspace — white-space character test

#include <ctype.h>

int
isspace(int c);;

The () function tests for the standard white-space characters. In the ASCII character set, this includes the following characters:

011 ht 012\nl 013\vt 014\np 015\cr
040 sp

The isspace() function returns zero if the character tests false and returns non-zero if the character tests true.

ctype(3), ascii(7)

The isspace() function conforms to ANSI X3.159-1989 (“ANSI C89”).

4.4BSD-Lite2 June 4, 1993 ISSPACE(3)