StdLib/LibC/Ctype/CConv.c

   1 /** @file
   2   Case conversion function implementations for <ctype.h>
   3
   4   The tolower function converts an uppercase letter to a corresponding
   5   lowercase letter.  If the argument is a character for which isupper
   6   is true and there are one or more corresponding characters, as
   7   specified by the current locale, for which islower is true, the tolower
   8   function returns one of the corresponding characters (always the same one
   9   for any given locale); otherwise, the argument is returned unchanged.
  10
  11   The toupper function converts a lowercase letter to a corresponding
  12   uppercase letter.  If the argument is a character for which islower is true
  13   and there are one or more corresponding characters, as specified by the
  14   current locale, for which isupper is true, the toupper function returns one
  15   of the corresponding characters (always the same one for any given locale);
  16   otherwise, the argument is returned unchanged.
  17
  18   Copyright (c) 2010 - 2011, Intel Corporation. All rights reserved.<BR>
  19   This program and the accompanying materials are licensed and made available under
  20   the terms and conditions of the BSD License that accompanies this distribution.
  21   The full text of the license may be found at
  22   http://opensource.org/licenses/bsd-license.
  23
  24   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  25   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  26 **/
  27 #include  <LibConfig.h>
  28
  29 #define NO_CTYPE_MACROS            // So that we don't define the classification macros
  30 #include  <ctype.h>
  31
  32 /** The tolower function converts an uppercase letter to a corresponding
  33     lowercase letter.
  34
  35     @param[in]    c   The character to be converted.
  36
  37     @return   If the argument is a character for which isupper is true and
  38               there are one or more corresponding characters, as specified by
  39               the current locale, for which islower is true, the tolower
  40               function returns one of the corresponding characters (always the
  41               same one for any given locale); otherwise, the argument is
  42               returned unchanged.
  43 **/
  44 int
  45 tolower(
  46   IN  int _c
  47   )
  48 {
  49   return (isupper(_c) ? _lConvT[_c] : _c);
  50 }
  51
  52 /** The toupper function converts a lowercase letter to a corresponding
  53     uppercase letter.
  54
  55     @param[in]    c   The character to be converted.
  56
  57     @return   If the argument is a character for which islower is true and
  58               there are one or more corresponding characters, as specified by
  59               the current locale, for which isupper is true, the toupper
  60               function returns one of the corresponding characters (always the
  61               same one for any given locale); otherwise, the argument is
  62               returned unchanged.
  63 **/
  64 int
  65 toupper(
  66   IN  int _c
  67   )
  68 {
  69   return (islower(_c) ? _uConvT[_c] : _c);
  70 }