lib/wcwidth.h

   1 /* Determine the number of screen columns needed for a character.
   2    Copyright (C) 2006 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 # if HAVE_WCHAR_H
  25 /* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
  26    <wchar.h>.
  27    BSD/OS 4.1 has a bug: <stdio.h> and <time.h> must be included before
  28    <wchar.h>.  */
  29 #  include <stdio.h>
  30 #  include <time.h>
  31 #  include <wchar.h>
  32 # endif
  33
  34 /* Get iswprint.  */
  35 # include <wctype.h>
  36
  37 # ifndef HAVE_DECL_WCWIDTH
  38 "this configure-time declaration test was not run"
  39 # endif
  40 # ifndef wcwidth
  41 #  if !HAVE_WCWIDTH
  42
  43 /* wcwidth doesn't exist, so assume all printable characters have
  44    width 1.  */
  45 static inline int
  46 wcwidth (wchar_t wc)
  47 {
  48   return wc == 0 ? 0 : iswprint (wc) ? 1 : -1;
  49 }
  50
  51 #  elif !HAVE_DECL_WCWIDTH
  52
  53 /* wcwidth exists but is not declared.  */
  54 extern
  55 #   ifdef __cplusplus
  56 "C"
  57 #   endif
  58 int wcwidth (int /* actually wchar_t */);
  59
  60 #  endif
  61 # endif
  62
  63 #endif /* HAVE_WCHAR_H */
  64
  65 #endif /* _gl_WCWIDTH_H */