1 /*
   2  * Copyright (c) 1989, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  * (c) UNIX System Laboratories, Inc.
   5  * All or some portions of this file are derived from material licensed
   6  * to the University of California by American Telephone and Telegraph
   7  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
   8  * the permission of UNIX System Laboratories, Inc.
   9  *
  10  * This code is derived from software contributed to Berkeley by
  11  * Paul Borman at Krystal Technologies.
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14  * modification, are permitted provided that the following conditions
  15  * are met:
  16  * 1. Redistributions of source code must retain the above copyright
  17  *    notice, this list of conditions and the following disclaimer.
  18  * 2. Redistributions in binary form must reproduce the above copyright
  19  *    notice, this list of conditions and the following disclaimer in the
  20  *    documentation and/or other materials provided with the distribution.
  21  * 4. Neither the name of the University nor the names of its contributors
  22  *    may be used to endorse or promote products derived from this software
  23  *    without specific prior written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  35  * SUCH DAMAGE.
  36  */
  37 
  38 /*
  39  * Copyright 2010 Nexenta Systems, Inc.  All rights reserved.
  40  * Use is subject to license terms.
  41  */
  42 
  43 #include "lint.h"
  44 #include <wchar.h>
  45 #include "_ctype.h"
  46 #include "runetype.h"
  47 
  48 #undef wcwidth
  49 
  50 int
  51 wcwidth(wchar_t wc)
  52 {
  53         unsigned int x;
  54 
  55         if (wc == 0)
  56                 return (0);
  57 
  58         x = ((wc < 0 || wc >= _CACHED_RUNES) ? ___runetype(wc) :
  59             _CurrentRuneLocale->__runetype[wc]) & (_CTYPE_SWM|_CTYPE_R);
  60 
  61         if ((x & _CTYPE_SWM) != 0)
  62                 return ((x & _CTYPE_SWM) >> _CTYPE_SWS);
  63         return ((x & _CTYPE_R) != 0 ? 1 : -1);
  64 }
  65 
  66 #pragma weak _scrwidth = scrwidth
  67 
  68 /*
  69  * This is a Solaris extension.  It never returns a negative width, even for
  70  * non-printable characters.  It is used internally by the printf
  71  * implementation for %ws.
  72  */
  73 int
  74 scrwidth(wchar_t wc)
  75 {
  76         int     v = wcwidth(wc);
  77         return (v > 0 ? v : 0);
  78 }