/*
 * tclUtf.c --
 *
 *	Routines for manipulating UTF-8 strings.
 *
 * Copyright (c) 1997-1998 Sun Microsystems, Inc.
 *
 * See the file "license.terms" for information on usage and redistribution of
 * this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * RCS: @(#) $Id: tclUtf.c,v 1.36 2005/09/07 15:31:10 dgp Exp $
 */

#include "tclInt.h"

/*
 * Include the static character classification tables and macros.
 */

				 * large enough to hold the UTF-8 character
				 * (at most TCL_UTF_MAX bytes). */
{
    if ((ch > 0) && (ch < UNICODE_SELF)) {
	buf[0] = (char) ch;
	return 1;
    }
    if (ch >= 0) {
	if (ch <= 0x7FF) {
	    buf[1] = (char) ((ch | 0x80) & 0xBF);
	    buf[0] = (char) ((ch >> 6) | 0xC0);
	    return 2;
	}
	if (ch <= 0xFFFF) {
	three:
	    buf[2] = (char) ((ch | 0x80) & 0xBF);
	    buf[1] = (char) (((ch >> 6) | 0x80) & 0xBF);
	    buf[0] = (char) ((ch >> 12) | 0xE0);
	    return 3;
	}

#if TCL_UTF_MAX > 3
	if (ch <= 0x1FFFFF) {
	    buf[3] = (char) ((ch | 0x80) & 0xBF);
	    buf[2] = (char) (((ch >> 6) | 0x80) & 0xBF);
	    buf[1] = (char) (((ch >> 12) | 0x80) & 0xBF);
	    buf[0] = (char) ((ch >> 18) | 0xF0);
	    return 4;
	}
	if (ch <= 0x3FFFFFF) {
	    buf[4] = (char) ((ch | 0x80) & 0xBF);
	    buf[3] = (char) (((ch >> 6) | 0x80) & 0xBF);
	    buf[2] = (char) (((ch >> 12) | 0x80) & 0xBF);
	    buf[1] = (char) (((ch >> 18) | 0x80) & 0xBF);
	    buf[0] = (char) ((ch >> 24) | 0xF8);
	    return 5;
	}
	if (ch <= 0x7FFFFFFF) {
	    buf[5] = (char) ((ch | 0x80) & 0xBF);
	    buf[4] = (char) (((ch >> 6) | 0x80) & 0xBF);
	    buf[3] = (char) (((ch >> 12) | 0x80) & 0xBF);
	    buf[2] = (char) (((ch >> 18) | 0x80) & 0xBF);
	    buf[1] = (char) (((ch >> 24) | 0x80) & 0xBF);
	    buf[0] = (char) ((ch >> 30) | 0xFC);
	    return 6;
	}
#endif
    }

    ch = 0xFFFD;
    goto three;
}

/*
 *---------------------------------------------------------------------------