1  /* Determine the number of screen columns needed for a string.
       2     Copyright (C) 2000-2004, 2007, 2009-2023 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 3 of the License, or
       7     (at your option) 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, see <https://www.gnu.org/licenses/>.  */
      16  
      17  /* This file uses HAVE_DECL_MBSWIDTH_IN_WCHAR_H.  */
      18  #if !_GL_CONFIG_H_INCLUDED
      19   #error "Please include config.h first."
      20  #endif
      21  
      22  #include <stddef.h>
      23  
      24  /* Avoid a clash of our mbswidth() with a function of the same name defined
      25     in UnixWare 7.1.1 <wchar.h>.  We need this #include before the #define
      26     below.  */
      27  #if HAVE_DECL_MBSWIDTH_IN_WCHAR_H
      28  # include <wchar.h>
      29  #endif
      30  
      31  
      32  #ifdef __cplusplus
      33  extern "C" {
      34  #endif
      35  
      36  
      37  /* Optional flags to influence mbswidth/mbsnwidth behavior.  */
      38  
      39  /* If this bit is set, return -1 upon finding an invalid or incomplete
      40     character.  Otherwise, assume invalid characters have width 1.  */
      41  #define MBSW_REJECT_INVALID 1
      42  
      43  /* If this bit is set, return -1 upon finding a non-printable character.
      44     Otherwise, assume unprintable characters have width 0 if they are
      45     control characters and 1 otherwise.  */
      46  #define MBSW_REJECT_UNPRINTABLE 2
      47  
      48  
      49  /* Returns the number of screen columns needed for STRING.  */
      50  #define mbswidth gnu_mbswidth  /* avoid clash with UnixWare 7.1.1 function */
      51  extern int mbswidth (const char *string, int flags);
      52  
      53  /* Returns the number of screen columns needed for the NBYTES bytes
      54     starting at BUF.  */
      55  extern int mbsnwidth (const char *buf, size_t nbytes, int flags);
      56  
      57  
      58  #ifdef __cplusplus
      59  }
      60  #endif