gl/wcwidth.h

   1 /* Determine the number of screen columns needed for a character.
   2    Copyright (C) 2006, 2007 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software Foundation,
  16    Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  17
  18 #ifndef _gl_WCWIDTH_H
  19 #define _gl_WCWIDTH_H
  20
  21 #if HAVE_WCHAR_T
  22
  23 /* Get wcwidth if available, along with wchar_t.  */
  24 # include <wchar.h>
  25
  26 /* Get iswprint.  */
  27 # include <wctype.h>
  28
  29 # ifndef HAVE_DECL_WCWIDTH
  30 "this configure-time declaration test was not run"
  31 # endif
  32 # ifndef wcwidth
  33 #  if !HAVE_WCWIDTH
  34
  35 /* wcwidth doesn't exist, so assume all printable characters have
  36    width 1.  */
  37 static inline int
  38 wcwidth (wchar_t wc)
  39 {
  40   return wc == 0 ? 0 : iswprint (wc) ? 1 : -1;
  41 }
  42
  43 #  elif !HAVE_DECL_WCWIDTH
  44
  45 /* wcwidth exists but is not declared.  */
  46 extern
  47 #   ifdef __cplusplus
  48 "C"
  49 #   endif
  50 int wcwidth (int /* actually wchar_t */);
  51
  52 #  endif
  53 # endif
  54
  55 #endif /* HAVE_WCHAR_T */
  56
  57 #endif /* _gl_WCWIDTH_H */