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@(#)isspace.3 5.3 (Berkeley) 7/31/91
.Dd April 17, 2008 .Dt ISBLANK 3 .Os .Sh NAME .Nm isblank .Nd blank-space 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 the standard blank-space characters. The standard blank-space characters are the following:
p l -tag -width xxxxx -offset indent -compact t Sq \0 Space character. t Li \et Horizontal tab. .El
p In the .Em ``C'' locale, .Fn isblank returns true only for the standard blank-space characters. .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 isalnum 3 , .Xr isalpha 3 , .Xr isascii 3 , .Xr iscntrl 3 , .Xr isdigit 3 , .Xr isgraph 3 , .Xr islower 3 , .Xr isprint 3 , .Xr ispunct 3 , .Xr isspace 3 , .Xr isupper 3 , .Xr isxdigit 3 , .Xr stdio 3 , .Xr toascii 3 , .Xr tolower 3 , .Xr toupper 3 , .Xr ascii 7 .Sh CAVEATS The argument to .Fn isblank must be .Dv EOF or representable as an .Vt unsigned char ; otherwise, the behavior is undefined. See the .Sx CAVEATS section of .Xr ctype 3 for more details.