text: /* Determine the number of screen columns needed for a string.
     Copyright (C) 2000-2004, 2007, 2009-2018 Free Software Foundation, Inc.
  
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
  
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
  
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  
  #include <stddef.h>
  
  /* Avoid a clash of our mbswidth() with a function of the same name defined
     in UnixWare 7.1.1 <wchar.h>.  We need this #include before the #define
     below.
     However, we don't want to #include <wchar.h> on all platforms because
     - Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
       <wchar.h>.
     - BSD/OS 4.1 has a bug: <stdio.h> and <time.h> must be included before
       <wchar.h>.  */
  #if HAVE_DECL_MBSWIDTH_IN_WCHAR_H
  # include <wchar.h>
  #endif
  
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  
  /* Optional flags to influence mbswidth/mbsnwidth behavior.  */
  
  /* If this bit is set, return -1 upon finding an invalid or incomplete
     character.  Otherwise, assume invalid characters have width 1.  */
  #define MBSW_REJECT_INVALID 1
  
  /* If this bit is set, return -1 upon finding a non-printable character.
     Otherwise, assume unprintable characters have width 0 if they are
     control characters and 1 otherwise.  */
  #define MBSW_REJECT_UNPRINTABLE 2
  
  
  /* Returns the number of screen columns needed for STRING.  */
  #define mbswidth gnu_mbswidth  /* avoid clash with UnixWare 7.1.1 function */
  extern int mbswidth (const char *string, int flags);
  
  /* Returns the number of screen columns needed for the NBYTES bytes
     starting at BUF.  */
  extern int mbsnwidth (const char *buf, size_t nbytes, int flags);
  
  
  #ifdef __cplusplus
  }
  #endif
  