NAME

isblank — blank-space character test

LIBRARY

Standard C Library (libc, -lc)

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 and returns non-zero if the character tests true.

SEE ALSO

ctype(3), 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)

CAVEATS

The argument to isblank() must be EOF or representable as an unsigned char; otherwise, the behavior is undefined. See the CAVEATS section of ctype(3) for more details.