ISBLANK(3) | Library Functions Manual | ISBLANK(3) |
isblank
, isblank_l
— blank-space single-byte character test
#include
<ctype.h>
int
isblank
(int
c);
int
isblank_l
(int
c, locale_t
locale);
The
isblank
()
and
isblank_l
()
functions test for blank-space characters. In the C locale, the complete
list of blank-space characters is:
\t
OpenBSD always uses the C locale for these functions, ignoring the global locale, the thread-specific locale, and the locale argument.
These functions return zero if the character tests false or non-zero if the character tests true.
On systems supporting non-ASCII single-byte character encodings,
these functions may return non-zero for additional characters, and the
results of isblank
() may depend on the
LC_CTYPE
locale(1).
isalnum(3), isalpha(3), isascii(3), iscntrl(3), isdigit(3), isgraph(3), islower(3), isprint(3), ispunct(3), isspace(3), isupper(3), iswblank(3), isxdigit(3), stdio(3), toascii(3), tolower(3), toupper(3), ascii(7)
The isblank
() function conforms to
ISO/IEC 9899:1999 (“ISO C99”),
and isblank_l
() to IEEE Std
1003.1-2008 (“POSIX.1”).
The isblank
() function has been available
since 4.4BSD, and
isblank_l
() since OpenBSD
6.2.
The argument c must be
EOF
or representable as an unsigned
char
; otherwise, the result is undefined.
September 5, 2017 | OpenBSD-current |