/* Determine the number of screen columns needed for a string.   Copyright (C) 2000-2001 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.  *//* Written by Bruno Haible <haible@clisp.cons.org>.  */#ifdef HAVE_CONFIG_H# include <config.h>#endif/* Get MB_CUR_MAX.  */#include <stdlib.h>#include <string.h>/* Get isprint().  */#include <ctype.h>/* Get mbstate_t, mbrtowc(), mbsinit(), wcwidth().  */#if HAVE_WCHAR_H# include <wchar.h>#endif/* Get iswprint(), iswcntrl().  */#if HAVE_WCTYPE_H# include <wctype.h>#endif#if !defined iswprint && !HAVE_ISWPRINT# define iswprint(wc) 1#endif#if !defined iswcntrl && !HAVE_ISWCNTRL# define iswcntrl(wc) 0#endif#ifndef mbsinit# if !HAVE_MBSINIT#  define mbsinit(ps) 1# endif#endif#ifndef HAVE_DECL_WCWIDTH"this configure-time declaration test was not run"#endif#if !HAVE_DECL_WCWIDTHint wcwidth ();#endif#ifndef wcwidth# if !HAVE_WCWIDTH/* wcwidth doesn't exist, so assume all printable characters have   width 1.  */#  define wcwidth(wc) ((wc) == 0 ? 0 : iswprint (wc) ? 1 : -1)# endif#endif/* Get ISPRINT.  */#if defined (STDC_HEADERS) || (!defined (isascii) && !defined (HAVE_ISASCII))# define IN_CTYPE_DOMAIN(c) 1#else# define IN_CTYPE_DOMAIN(c) isascii(c)#endif/* Undefine to protect against the definition in wctype.h of solaris2.6.   */#undef ISPRINT#define ISPRINT(c) (IN_CTYPE_DOMAIN (c) && isprint (c))#undef ISCNTRL#define ISCNTRL(c) (IN_CTYPE_DOMAIN (c) && iscntrl (c))#include "mbswidth.h"/* Returns the number of columns needed to represent the multibyte   character string pointed to by STRING.  If a non-printable character   occurs, and MBSW_REJECT_UNPRINTABLE is specified, -1 is returned.   With flags = MBSW_REJECT_INVALID | MBSW_REJECT_UNPRINTABLE, this is   the multibyte analogon of the wcswidth function.  */intmbswidth (string, flags)     const char *string;     int flags;{  return mbsnwidth (string, strlen (string), flags);}/* Returns the number of columns needed to represent the multibyte   character string pointed to by STRING of length NBYTES.  If a   non-printable character occurs, and MBSW_REJECT_UNPRINTABLE is   specified, -1 is returned.  */intmbsnwidth (string, nbytes, flags)     const char *string;     size_t nbytes;     int flags;{  const char *p = string;  const char *plimit = p + nbytes;  int width;  width = 0;#if HAVE_MBRTOWC  if (MB_CUR_MAX > 1)    {      while (p < plimit)	switch (*p)	  {	    case ' ': case '!': case '"': case '#': case '%':	    case '&': case '\'': case '(': case ')': case '*':	    case '+': case ',': case '-': case '.': case '/':	    case '0': case '1': case '2': case '3': case '4':	    case '5': case '6': case '7': case '8': case '9':	    case ':': case ';': case '<': case '=': case '>':	    case '?':	    case 'A': case 'B': case 'C': case 'D': case 'E':	    case 'F': case 'G': case 'H': case 'I': case 'J':	    case 'K': case 'L': case 'M': case 'N': case 'O':	    case 'P': case 'Q': case 'R': case 'S': case 'T':	    case 'U': case 'V': case 'W': case 'X': case 'Y':	    case 'Z':	    case '[': case '\\': case ']': case '^': case '_':	    case 'a': case 'b': case 'c': case 'd': case 'e':	    case 'f': case 'g': case 'h': case 'i': case 'j':	    case 'k': case 'l': case 'm': case 'n': case 'o':	    case 'p': case 'q': case 'r': case 's': case 't':	    case 'u': case 'v': case 'w': case 'x': case 'y':	    case 'z': case '{': case '|': case '}': case '~':	      /* These characters are printable ASCII characters.  */	      p++;	      width++;	      break;	    default:	      /* If we have a multibyte sequence, scan it up to its end.  */	      {		mbstate_t mbstate;		memset (&mbstate, 0, sizeof mbstate);		do		  {		    wchar_t wc;		    size_t bytes;		    int w;		    bytes = mbrtowc (&wc, p, plimit - p, &mbstate);		    if (bytes == (size_t) -1)		      /* An invalid multibyte sequence was encountered.  */		      {			if (!(flags & MBSW_REJECT_INVALID))			  {			    p++;			    width++;			    break;			  }			else			  return -1;		      }		    if (bytes == (size_t) -2)		      /* An incomplete multibyte character at the end.  */		      {			if (!(flags & MBSW_REJECT_INVALID))			  {			    p = plimit;			    width++;			    break;			  }			else			  return -1;		      }		    if (bytes == 0)		      /* A null wide character was encountered.  */		      bytes = 1;		    w = wcwidth (wc);		    if (w >= 0)		      /* A printable multibyte character.  */		      width += w;		    else		      /* An unprintable multibyte character.  */		      if (!(flags & MBSW_REJECT_UNPRINTABLE))			width += (iswcntrl (wc) ? 0 : 1);		      else			return -1;		    p += bytes;		  }		while (! mbsinit (&mbstate));	      }	      break;	  }      return width;    }#endif  while (p < plimit)    {      unsigned char c = (unsigned char) *p++;      if (ISPRINT (c))	width++;      else if (!(flags & MBSW_REJECT_UNPRINTABLE))	width += (ISCNTRL (c) ? 0 : 1);      else	return -1;    }  return width;}