locale/FreeBSD/isblank.3

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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 $
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  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 .