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@(#)isblank.3 8.1 (Berkeley) 6/4/93
$FreeBSD: head/lib/libc/locale/isblank.3 132859 2004-07-29 23:32:41Z tjr $
.Dd July 30, 2004 .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" .Sh DESCRIPTION The .Fn isblank function tests for a space or tab character. For any locale, this includes the following standard characters:
p l -column `\et''___ ``\et''___ t "``\et''\t`` ''" .El
p In the "C" locale .Fn isblank successful test is limited to this characters only. For single C .Va char Ns s locales (see .Xr multibyte 3 ) the value of the argument is representable as an .Li unsigned char or the value of .Dv EOF . .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 deprecated. The .Fn iswblank function should be used instead for maximum portability. .Sh RETURN VALUES The .Fn isblank function returns zero if the character tests false and returns non-zero if the character tests true. .Sh SEE ALSO .Xr ctype 3 , .Xr iswblank 3 , .Xr multibyte 3 , .Xr ascii 7 .Sh STANDARDS The .Fn isblank function conforms to .St -isoC-99 .