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146 lines
3.4 KiB
C
146 lines
3.4 KiB
C
/* Copyright (C) 1995,1996 Free Software Foundation, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; see the file COPYING. If not, write to
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* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* As a special exception, the Free Software Foundation gives permission
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* for additional uses of the text contained in its release of GUILE.
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*
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* The exception is that, if you link the GUILE library with other files
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* to produce an executable, this does not by itself cause the
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* resulting executable to be covered by the GNU General Public License.
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* Your use of that executable is in no way restricted on account of
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* linking the GUILE library code into it.
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*
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* This exception does not however invalidate any other reasons why
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* the executable file might be covered by the GNU General Public License.
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*
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* This exception applies only to the code released by the
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* Free Software Foundation under the name GUILE. If you copy
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* code from other Free Software Foundation releases into a copy of
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* GUILE, as the General Public License permits, the exception does
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* not apply to the code that you add in this way. To avoid misleading
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* anyone as to the status of such modified files, you must delete
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* this exception notice from them.
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*
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* If you write modifications of your own for GUILE, it is your choice
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* whether to permit this exception to apply to your modifications.
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* If you do not wish that, delete this exception notice.
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*/
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#include "extchrs.h"
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#ifdef FAKE_EXT_SCM_CHARS
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#ifdef __STDC__
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int
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xmblen (const char * str, size_t size)
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#else
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int
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xmblen (str, size)
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const char * str;
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size_t size;
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#endif
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{
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if (!str)
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return 0;
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if (*(unsigned char *)str > 127)
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return ((size < 4)
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? -1
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: 4);
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else if (!*str)
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return 0;
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else
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return 1;
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}
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#ifdef __STDC__
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int
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xwctomb (char * _str, int c)
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#else
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int
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xwctomb (_str, c)
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char * _str;
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int c;
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#endif
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{
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unsigned char * str;
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str = (unsigned char *)_str;
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if (!str)
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return 0;
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if (!c)
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{
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*str = 0;
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return 0;
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}
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if (c < 127)
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{
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*str = c;
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return 1;
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}
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str[0] = 255;
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str[1] = 0x80 | ((c >> 10) & 0x3f);
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str[2] = 0x80 | ((c >> 4) & 0x3f);
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str[3] = 0x80 | (c & 0xf);
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return 4;
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}
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#ifdef __STDC__
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int
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xmbtowc (xwchar_t * result, const unsigned char * _str, size_t size)
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#else
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int
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xmbtowc (result, str, size)
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xwchar_t * result;
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const unsigned char * _str;
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size_t size;
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#endif
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{
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const unsigned char * str;
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str = (const unsigned char *)_str;
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if (!str)
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return 0;
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if ((size == 0) || !*str)
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{
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*result = 0;
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return 0;
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}
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if (*str < 128)
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{
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*result = *str;
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return 1;
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}
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if ( (*str != 255)
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|| (size < 4))
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return -1;
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*result = ( ((str[1] & 0x3f) << 10)
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| ((str[2] & 0x3f) << 4)
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| (str[3] & 0xf));
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return 4;
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}
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#endif /* FAKE_EXT_SCM_CHARS */
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