ISBLANK(3)

NAME
isblank - blank-space character test

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

DESCRIPTION
The isblank() function tests for the standard blank-space characters. The standard blank-space characters are the following:

‘ ’ Space character.
\t  Horizontal tab.

In the C locale, isblank() returns true only for the standard blank-space characters.

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

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

STANDARDS
The isblank() function conforms to isoC-99.

CAVEATS
The argument to isblank() must be EOF or representable as an unsigned char; otherwise, the result is undefined.