locale/islower.3

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  36 .\"     @(#)islower.3   8.1 (Berkeley) 6/4/93
  37 .\" $FreeBSD: src/lib/libc/locale/islower.3,v 1.17 2004/08/21 07:37:08 tjr Exp $
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  39 .Dd August 21, 2004
  40 .Dt ISLOWER 3
  41 .Os
  42 .Sh NAME
  43 .Nm islower
  44 .Nd lower-case character test
  45 .Sh LIBRARY
  46 .Lb libc
  47 .Sh SYNOPSIS
  48 .In ctype.h
  49 .Ft int
  50 .Fn islower "int c"
  51 .Sh DESCRIPTION
  52 The
  53 .Fn islower
  54 function tests for any lower-case letters.
  55 For single C
  56 .Va char Ns s
  57 locales (see
  58 .Xr multibyte 3 )
  59 the value of the argument is
  60 representable as an
  61 .Li unsigned char
  62 or the value of
  63 .Dv EOF .
  64 In the ASCII character set, this includes the following characters
  65 (with their numeric values shown in octal):
  66 .Pp
  67 .Bl -column \&000_``0''__ \&000_``0''__ \&000_``0''__ \&000_``0''__ \&000_``0''__
  68 .It "\&141\ ``a'' \t142\ ``b'' \t143\ ``c'' \t144\ ``d'' \t145\ ``e''"
  69 .It "\&146\ ``f'' \t147\ ``g'' \t150\ ``h'' \t151\ ``i'' \t152\ ``j''"
  70 .It "\&153\ ``k'' \t154\ ``l'' \t155\ ``m'' \t156\ ``n'' \t157\ ``o''"
  71 .It "\&160\ ``p'' \t161\ ``q'' \t162\ ``r'' \t163\ ``s'' \t164\ ``t''"
  72 .It "\&165\ ``u'' \t166\ ``v'' \t167\ ``w'' \t170\ ``x'' \t171\ ``y''"
  73 .It "\&172\ ``z''"
  74 .El
  75 .Sh RETURN VALUES
  76 The
  77 .Fn islower
  78 function returns zero if the character tests false and
  79 returns non-zero if the character tests true.
  80 .Sh COMPATIBILITY
  81 The
  82 .Bx 4.4
  83 extension of accepting arguments outside of the range of the
  84 .Vt "unsigned char"
  85 type in locales with large character sets is considered obsolete
  86 and may not be supported in future releases.
  87 The
  88 .Fn iswlower
  89 function should be used instead.
  90 .Sh SEE ALSO
  91 .Xr ctype 3 ,
  92 .Xr isalnum_l 3 ,
  93 .Xr iswlower 3 ,
  94 .Xr multibyte 3 ,
  95 .Xr tolower 3 ,
  96 .Xr ascii 7
  97 .Sh STANDARDS
  98 The
  99 .Fn islower
 100 function conforms to
 101 .St -isoC .