ISBLANK(3)
Library Functions Manual
ISBLANK(3)
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.
April 17, 2008
NetBSD 5.99