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
ISO/IEC 9899:1999
(“ISO C99”).
CAVEATS
The argument to isblank() must be
EOF or representable as an unsigned
char; otherwise, the result is undefined.