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@(#)isblank.3 8.1 (Berkeley) 6/4/93
$FreeBSD: head/lib/libc/locale/isblank.3 232935 2012-03-13 20:02:41Z theraven $
.Dd July 17, 2005 .Dt ISBLANK 3 .Os .Sh NAME .Nm isblank .Nd space or tab character test .Sh LIBRARY .Lb libc .Sh SYNOPSIS n ctype.h .Ft int .Fn isblank "int c" .Ft int .Fn isblank "int c" "locale_t loc" .Sh DESCRIPTION The .Fn isblank function tests for a space or tab character. For any locale, this includes the following standard characters: l -column XXXX t Do \et Dc Ta Dq " " .El
p In the "C" locale, a successful .Fn isblank test is limited to these characters only. The value of the argument must be representable as an .Vt "unsigned char" or the value of .Dv EOF .
p The .Fn isblank_l function takes an explicit locale argument, whereas the .Fn isblank function uses the current global or per-thread locale. .Sh RETURN VALUES The .Fn isblank function returns zero if the character tests false and returns non-zero if the character tests true. .Sh COMPATIBILITY The x 4.4 extension of accepting arguments outside of the range of the .Vt "unsigned char" type in locales with large character sets is considered obsolete and may not be supported in future releases. The .Fn iswblank function should be used instead. .Sh SEE ALSO .Xr ctype 3 , .Xr iswblank 3 , .Xr xlocale 3 , .Xr ascii 7 .Sh STANDARDS The .Fn isblank function conforms to .St -isoC-99 . The .Fn isblank_l function conforms to .St -p1003.1-2008 .