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.