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Command: isblank | Section: 3 | Source: OpenBSD | File: isblank.3
ISBLANK(3) FreeBSD Library Functions Manual ISBLANK(3)
NAME
isblank, isblank_l - blank-space single-byte character test
SYNOPSIS
#include <ctype.h>
int
isblank(int c);
int
isblank_l(int c, locale_t locale);
DESCRIPTION
The isblank() and isblank_l() functions test for blank-space characters.
In the C locale, the complete list of blank-space characters is:
` ' Space character.
\t Horizontal tab.
OpenBSD always uses the C locale for these functions, ignoring the global
locale, the thread-specific locale, and the locale argument.
RETURN VALUES
These functions return zero if the character tests false or non-zero if
the character tests true.
ENVIRONMENT
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).
SEE ALSO
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)
STANDARDS
The isblank() function conforms to ISO/IEC 9899:1999 ("ISO C99"), and
isblank_l() to IEEE Std 1003.1-2008 ("POSIX.1").
HISTORY
The isblank() function has been available since 4.4BSD, and isblank_l()
since OpenBSD 6.2.
CAVEATS
The argument c must be EOF or representable as an unsigned char;
otherwise, the result is undefined.
FreeBSD 14.1-RELEASE-p8 September 11, 2022 FreeBSD 14.1-RELEASE-p8