usr/src/lib/libc/port/locale/wcwidth.c

   1 /*
   2  * Copyright 2013 Garrett D'Amore <garrett@damore.org>
   3  * Copyright (c) 1989, 1993
   4  *      The Regents of the University of California.  All rights reserved.
   5  * (c) UNIX System Laboratories, Inc.
   6  * All or some portions of this file are derived from material licensed
   7  * to the University of California by American Telephone and Telegraph
   8  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
   9  * the permission of UNIX System Laboratories, Inc.
  10  *
  11  * This code is derived from software contributed to Berkeley by
  12  * Paul Borman at Krystal Technologies.
  13  *
  14  * Redistribution and use in source and binary forms, with or without
  15  * modification, are permitted provided that the following conditions
  16  * are met:
  17  * 1. Redistributions of source code must retain the above copyright
  18  *    notice, this list of conditions and the following disclaimer.
  19  * 2. Redistributions in binary form must reproduce the above copyright
  20  *    notice, this list of conditions and the following disclaimer in the
  21  *    documentation and/or other materials provided with the distribution.
  22  * 4. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  */
  38
  39 /*
  40  * Copyright 2010 Nexenta Systems, Inc.  All rights reserved.
  41  * Use is subject to license terms.
  42  */
  43
  44 #include "lint.h"
  45 #include <wchar.h>
  46 #include "_ctype.h"
  47 #include "runetype.h"
  48 #include "localeimpl.h"
  49
  50 #undef wcwidth
  51
  52 int
  53 wcwidth_l(wchar_t wc, locale_t loc)
  54 {
  55         unsigned int x;
  56         const _RuneLocale *rl = loc->runelocale;
  57
  58         if (wc == 0)
  59                 return (0);
  60
  61         x = ((wc < 0 || wc >= _CACHED_RUNES) ? __runetype(rl, wc) :
  62             rl->__runetype[wc]) & (_CTYPE_SWM|_CTYPE_R);
  63
  64         if ((x & _CTYPE_SWM) != 0)
  65                 return ((x & _CTYPE_SWM) >> _CTYPE_SWS);
  66         return ((x & _CTYPE_R) != 0 ? 1 : -1);
  67 }
  68
  69 int
  70 wcwidth(wchar_t wc)
  71 {
  72         return (wcwidth_l(wc, uselocale(NULL)));
  73 }
  74
  75 #pragma weak _scrwidth = scrwidth
  76
  77 /*
  78  * This is a Solaris extension.  It never returns a negative width, even for
  79  * non-printable characters.  It is used internally by the printf
  80  * implementation for %ws.
  81  */
  82 int
  83 scrwidth(wchar_t wc)
  84 {
  85         int     v = wcwidth(wc);
  86         return (v > 0 ? v : 0);
  87 }