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[bison.git] / lib / mbswidth.h

/* Determine the number of screen columns needed for a string.
   Copyright (C) 2000-2003 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 2, 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, write to the Free Software Foundation,
   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#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.  */
#if HAVE_WCHAR_H
# include <wchar.h>
#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);