locale/FreeBSD/isxdigit.3

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  32 .\"     @(#)isxdigit.3  8.1 (Berkeley) 6/4/93
  33 .\" $FreeBSD: src/lib/libc/locale/isxdigit.3,v 1.25 2009/09/04 07:44:58 des Exp $
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  35 .Dd July 17, 2005
  36 .Dt ISXDIGIT 3
  37 .Os
  38 .Sh NAME
  39 .Nm isxdigit, ishexnumber
  40 .Nd hexadecimal-digit character test
  41 .Sh LIBRARY
  42 .Lb libc
  43 .Sh SYNOPSIS
  44 .In ctype.h
  45 .Ft int
  46 .Fn isxdigit "int c"
  47 .Ft int
  48 .Fn ishexnumber "int c"
  49 .Sh DESCRIPTION
  50 The
  51 .Fn isxdigit
  52 function tests for any hexadecimal-digit character.
  53 Regardless of locale, this includes the following characters only:
  54 .Pp
  55 .Bl -column \&``0''______ \&``0''______ \&``0''______ \&``0''______ \&``0''______
  56 .It "\&``0''\t``1''\t``2''\t``3''\t``4''"
  57 .It "\&``5''\t``6''\t``7''\t``8''\t``9''"
  58 .It "\&``A''\t``B''\t``C''\t``D''\t``E''"
  59 .It "\&``F''\t``a''\t``b''\t``c''\t``d''"
  60 .It "\&``e''\t``f''"
  61 .El
  62 .Pp
  63 The
  64 .Fn ishexnumber
  65 function behaves similarly to
  66 .Fn isxdigit ,
  67 but may recognize additional characters,
  68 depending on the current locale setting.
  69 .Pp
  70 The value of the argument must be representable as an
  71 .Vt "unsigned char"
  72 or the value of
  73 .Dv EOF .
  74 .Sh RETURN VALUES
  75 The
  76 .Fn isxdigit
  77 function returns zero if the character tests false and
  78 returns non-zero if the character tests true.
  79 .Sh COMPATIBILITY
  80 The
  81 .Bx 4.4
  82 extension of accepting arguments outside of the range of the
  83 .Vt "unsigned char"
  84 type in locales with large character sets is considered obsolete
  85 and may not be supported in future releases.
  86 The
  87 .Fn iswxdigit
  88 function should be used instead.
  89 .Sh SEE ALSO
  90 .Xr ctype 3 ,
  91 .Xr iswxdigit 3 ,
  92 .Xr ascii 7
  93 .Sh STANDARDS
  94 The
  95 .Fn isxdigit
  96 function conforms to
  97 .St -isoC .
  98 .Sh HISTORY
  99 The
 100 .Fn ishexnumber
 101 function appeared in
 102 .Bx 4.4 .