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ISSPACE(3) Library Functions Manual ISSPACE(3)

isspace
whitespace character test

#include <ctype.h>
int
isspace(int c);

The isspace() function tests for the standard whitespace characters for which isalnum(3) is false. The standard whitespace characters are the following:
‘ ’
Space character.
Form feed.
New-line.
Carriage return.
Horizontal tab.
And vertical tab.
In the C locale, isspace() returns true only for the standard whitespace characters.

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

isalnum(3), isalpha(3), isascii(3), isblank(3), iscntrl(3), isdigit(3), isgraph(3), islower(3), isprint(3), ispunct(3), isupper(3), isxdigit(3), stdio(3), toascii(3), tolower(3), toupper(3), ascii(7)

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

The isspace() function first appeared in Version 7 AT&T UNIX.

The argument to isspace() must be EOF or representable as an unsigned char; otherwise, the result is undefined.
July 17, 2013 OpenBSD-6.1