lgl/wchar.in.h

   1 /* A substitute for ISO C99 <wchar.h>, for platforms that have issues.
   2
   3    Copyright (C) 2007-2008 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 Lesser General Public License as published by
   7    the Free Software Foundation; either version 2.1, 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 Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser 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 #ifdef __need_mbstate_t
  30 /* Special invocation convention inside uClibc header files.  */
  31
  32 #@INCLUDE_NEXT@ @NEXT_WCHAR_H@
  33
  34 #else
  35 /* Normal invocation convention.  */
  36
  37 #ifndef _GL_WCHAR_H
  38
  39 /* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
  40    <wchar.h>.
  41    BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be
  42    included before <wchar.h>.  */
  43 #include <stddef.h>
  44 #include <stdio.h>
  45 #include <time.h>
  46
  47 /* Include the original <wchar.h> if it exists.
  48    Some builds of uClibc lack it.  */
  49 /* The include_next requires a split double-inclusion guard.  */
  50 #if @HAVE_WCHAR_H@
  51 # @INCLUDE_NEXT@ @NEXT_WCHAR_H@
  52 #endif
  53
  54 #ifndef _GL_WCHAR_H
  55 #define _GL_WCHAR_H
  56
  57 /* The definition of GL_LINK_WARNING is copied here.  */
  58
  59 #ifdef __cplusplus
  60 extern "C" {
  61 #endif
  62
  63
  64 /* Return the number of screen columns needed for WC.  */
  65 #if @GNULIB_WCWIDTH@
  66 # if @REPLACE_WCWIDTH@
  67 #  undef wcwidth
  68 #  define wcwidth rpl_wcwidth
  69 extern int wcwidth (wchar_t);
  70 # else
  71 #  if !defined wcwidth && !@HAVE_DECL_WCWIDTH@
  72 /* wcwidth exists but is not declared.  */
  73 extern int wcwidth (int /* actually wchar_t */);
  74 #  endif
  75 # endif
  76 #elif defined GNULIB_POSIXCHECK
  77 # undef wcwidth
  78 # define wcwidth(w) \
  79     (GL_LINK_WARNING ("wcwidth is unportable - " \
  80                       "use gnulib module wcwidth for portability"), \
  81      wcwidth (w))
  82 #endif
  83
  84
  85 #ifdef __cplusplus
  86 }
  87 #endif
  88
  89 #endif /* _GL_WCHAR_H */
  90 #endif /* _GL_WCHAR_H */
  91 #endif