lib/wchar.in.h

   1 /* A substitute for ISO C99 <wchar.h>, for platforms that have issues.
   2
   3    Copyright (C) 2007 Free Software Foundation, Inc.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 2, or (at your option)
   8    any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program; if not, write to the Free Software Foundation,
  17    Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  18
  19 /* Written by Eric Blake.  */
  20
  21 /*
  22  * ISO C 99 <wchar.h> for platforms that have issues.
  23  * <http://www.opengroup.org/susv3xbd/wchar.h.html>
  24  *
  25  * For now, this just ensures proper prerequisite inclusion order and
  26  * the declaration of wcwidth().
  27  */
  28
  29 #ifndef _GL_WCHAR_H
  30
  31 /* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
  32    <wchar.h>.
  33    BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be
  34    included before <wchar.h>.  */
  35 #include <stddef.h>
  36 #include <stdio.h>
  37 #include <time.h>
  38
  39 /* Include the original <wchar.h> if it exists.
  40    Some builds of uClibc lack it.  */
  41 /* The include_next requires a split double-inclusion guard.  */
  42 #if @HAVE_WCHAR_H@
  43 # @INCLUDE_NEXT@ @NEXT_WCHAR_H@
  44 #endif
  45
  46 #ifndef _GL_WCHAR_H
  47 #define _GL_WCHAR_H
  48
  49 /* The definition of GL_LINK_WARNING is copied here.  */
  50
  51 #ifdef __cplusplus
  52 extern "C" {
  53 #endif
  54
  55
  56 /* Return the number of screen columns needed for WC.  */
  57 #if @GNULIB_WCWIDTH@
  58 # if @REPLACE_WCWIDTH@
  59 #  undef wcwidth
  60 #  define wcwidth rpl_wcwidth
  61 extern int wcwidth (wchar_t);
  62 # else
  63 #  if !defined wcwidth && !@HAVE_DECL_WCWIDTH@
  64 /* wcwidth exists but is not declared.  */
  65 extern int wcwidth (int /* actually wchar_t */);
  66 #  endif
  67 # endif
  68 #elif defined GNULIB_POSIXCHECK
  69 # undef wcwidth
  70 # define wcwidth(w) \
  71     (GL_LINK_WARNING ("wcwidth is unportable - " \
  72                       "use gnulib module wcwidth for portability"), \
  73      wcwidth (w))
  74 #endif
  75
  76
  77 #ifdef __cplusplus
  78 }
  79 #endif
  80
  81 #endif /* _GL_WCHAR_H */
  82 #endif /* _GL_WCHAR_H */