locale/FreeBSD/isalpha.3

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  36 .\"     @(#)isalpha.3   8.1 (Berkeley) 6/4/93
  37 .\" $FreeBSD: src/lib/libc/locale/isalpha.3,v 1.18 2004/08/21 07:37:08 tjr Exp $
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  39 .Dd August 21, 2004
  40 .Dt ISALPHA 3
  41 .Os
  42 .Sh NAME
  43 .Nm isalpha
  44 .Nd alphabetic character test
  45 .Sh LIBRARY
  46 .Lb libc
  47 .Sh SYNOPSIS
  48 .In ctype.h
  49 .Ft int
  50 .Fn isalpha "int c"
  51 .Sh DESCRIPTION
  52 The
  53 .Fn isalpha
  54 function tests for any character for which
  55 .Xr isupper 3
  56 or
  57 .Xr islower 3
  58 is true.
  59 For single C
  60 .Va char Ns s
  61 locales (see
  62 .Xr multibyte 3 )
  63 the value of the argument is
  64 representable as an
  65 .Li unsigned char
  66 or the value of
  67 .Dv EOF .
  68 In the ASCII character set, this includes the following characters
  69 (with their numeric values shown in octal):
  70 .Pp
  71 .Bl -column \&000_``0''__ \&000_``0''__ \&000_``0''__ \&000_``0''__ \&000_``0''__
  72 .It "\&101\ ``A'' \t102\ ``B'' \t103\ ``C'' \t104\ ``D'' \t105\ ``E''"
  73 .It "\&106\ ``F'' \t107\ ``G'' \t110\ ``H'' \t111\ ``I'' \t112\ ``J''"
  74 .It "\&113\ ``K'' \t114\ ``L'' \t115\ ``M'' \t116\ ``N'' \t117\ ``O''"
  75 .It "\&120\ ``P'' \t121\ ``Q'' \t122\ ``R'' \t123\ ``S'' \t124\ ``T''"
  76 .It "\&125\ ``U'' \t126\ ``V'' \t127\ ``W'' \t130\ ``X'' \t131\ ``Y''"
  77 .It "\&132\ ``Z'' \t141\ ``a'' \t142\ ``b'' \t143\ ``c'' \t144\ ``d''"
  78 .It "\&145\ ``e'' \t146\ ``f'' \t147\ ``g'' \t150\ ``h'' \t151\ ``i''"
  79 .It "\&152\ ``j'' \t153\ ``k'' \t154\ ``l'' \t155\ ``m'' \t156\ ``n''"
  80 .It "\&157\ ``o'' \t160\ ``p'' \t161\ ``q'' \t162\ ``r'' \t163\ ``s''"
  81 .It "\&164\ ``t'' \t165\ ``u'' \t166\ ``v'' \t167\ ``w'' \t170\ ``x''"
  82 .It "\&171\ ``y'' \t172\ ``z''"
  83 .El
  84 .Sh RETURN VALUES
  85 The
  86 .Fn isalpha
  87 function returns zero if the character tests false and
  88 returns non-zero if the character tests true.
  89 .Sh COMPATIBILITY
  90 The
  91 .Bx 4.4
  92 extension of accepting arguments outside of the range of the
  93 .Vt "unsigned char"
  94 type in locales with large character sets is considered obsolete
  95 and may not be supported in future releases.
  96 The
  97 .Fn iswalpha
  98 function should be used instead.
  99 .Sh SEE ALSO
 100 .Xr ctype 3 ,
 101 .Xr islower 3 ,
 102 .Xr isupper 3 ,
 103 .Xr iswalpha 3 ,
 104 .Xr multibyte 3 ,
 105 .Xr ascii 7
 106 .Sh STANDARDS
 107 The
 108 .Fn isalpha
 109 function conforms to
 110 .St -isoC .