locale/FreeBSD/isalpha.3

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  32 .\"     @(#)isalpha.3   8.1 (Berkeley) 6/4/93
  33 .\" $FreeBSD: src/lib/libc/locale/isalpha.3,v 1.23 2009/09/04 07:44:58 des Exp $
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  35 .Dd July 17, 2005
  36 .Dt ISALPHA 3
  37 .Os
  38 .Sh NAME
  39 .Nm isalpha
  40 .Nd alphabetic character test
  41 .Sh LIBRARY
  42 .Lb libc
  43 .Sh SYNOPSIS
  44 .In ctype.h
  45 .Ft int
  46 .Fn isalpha "int c"
  47 .Sh DESCRIPTION
  48 The
  49 .Fn isalpha
  50 function tests for any character for which
  51 .Xr isupper 3
  52 or
  53 .Xr islower 3
  54 is true.
  55 The value of the argument must be representable as an
  56 .Vt "unsigned char"
  57 or the value of
  58 .Dv EOF .
  59 .Pp
  60 In the ASCII character set, this includes the following characters
  61 (preceded by their numeric values, in octal):
  62 .Pp
  63 .Bl -column \&000_``0''__ \&000_``0''__ \&000_``0''__ \&000_``0''__ \&000_``0''__
  64 .It "\&101\ ``A'' \t102\ ``B'' \t103\ ``C'' \t104\ ``D'' \t105\ ``E''"
  65 .It "\&106\ ``F'' \t107\ ``G'' \t110\ ``H'' \t111\ ``I'' \t112\ ``J''"
  66 .It "\&113\ ``K'' \t114\ ``L'' \t115\ ``M'' \t116\ ``N'' \t117\ ``O''"
  67 .It "\&120\ ``P'' \t121\ ``Q'' \t122\ ``R'' \t123\ ``S'' \t124\ ``T''"
  68 .It "\&125\ ``U'' \t126\ ``V'' \t127\ ``W'' \t130\ ``X'' \t131\ ``Y''"
  69 .It "\&132\ ``Z'' \t141\ ``a'' \t142\ ``b'' \t143\ ``c'' \t144\ ``d''"
  70 .It "\&145\ ``e'' \t146\ ``f'' \t147\ ``g'' \t150\ ``h'' \t151\ ``i''"
  71 .It "\&152\ ``j'' \t153\ ``k'' \t154\ ``l'' \t155\ ``m'' \t156\ ``n''"
  72 .It "\&157\ ``o'' \t160\ ``p'' \t161\ ``q'' \t162\ ``r'' \t163\ ``s''"
  73 .It "\&164\ ``t'' \t165\ ``u'' \t166\ ``v'' \t167\ ``w'' \t170\ ``x''"
  74 .It "\&171\ ``y'' \t172\ ``z''"
  75 .El
  76 .Sh RETURN VALUES
  77 The
  78 .Fn isalpha
  79 function returns zero if the character tests false and
  80 returns non-zero if the character tests true.
  81 .Sh COMPATIBILITY
  82 The
  83 .Bx 4.4
  84 extension of accepting arguments outside of the range of the
  85 .Vt "unsigned char"
  86 type in locales with large character sets is considered obsolete
  87 and may not be supported in future releases.
  88 The
  89 .Fn iswalpha
  90 function should be used instead.
  91 .Sh SEE ALSO
  92 .Xr ctype 3 ,
  93 .Xr isalnum_l 3 ,
  94 .Xr islower 3 ,
  95 .Xr isupper 3 ,
  96 .Xr iswalpha 3 ,
  97 .Xr ascii 7
  98 .Sh STANDARDS
  99 The
 100 .Fn isalpha
 101 function conforms to
 102 .St -isoC .