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28 .\" @(#)isblank.3 8.1 (Berkeley) 6/4/93
29 .\" $FreeBSD: src/lib/libc/locale/isblank.3,v 1.26 2009/11/11 11:31:02 roam Exp $
30 .\"
31 .Dd July 17, 2005
32 .Dt ISBLANK 3
33 .Os
34 .Sh NAME
35 .Nm isblank
36 .Nd space or tab character test
37 .Sh LIBRARY
38 .Lb libc
39 .Sh SYNOPSIS
40 .In ctype.h
41 .Ft int
42 .Fn isblank "int c"
43 .Sh DESCRIPTION
44 The
45 .Fn isblank
46 function tests for a space or tab character.
47 For any locale, this includes the following standard characters:
48 .Pp
49 .Bl -column \&`\et''___ \&``\et''___
50 .It "\&``\et''\t`` ''"
51 .El
52 .Pp
53 In the "C" locale, a successful
54 .Fn isblank
55 test is limited to these characters only.
56 The value of the argument must be representable as an
57 .Vt "unsigned char"
58 or the value of
59 .Dv EOF .
60 .Sh RETURN VALUES
61 The
62 .Fn isblank
63 function returns zero if the character tests false and
64 returns non-zero if the character tests true.
65 .Sh COMPATIBILITY
66 The
67 .Bx 4.4
68 extension of accepting arguments outside of the range of the
69 .Vt "unsigned char"
70 type in locales with large character sets is considered obsolete
71 and may not be supported in future releases.
72 The
73 .Fn iswblank
74 function should be used instead.
75 .Sh SEE ALSO
76 .Xr ctype 3 ,
77 .Xr isalnum_l 3 ,
78 .Xr iswblank 3 ,
79 .Xr ascii 7
80 .Sh STANDARDS
81 The
82 .Fn isblank
83 function
84 conforms to
85 .St -isoC-99 .