charsets.c

/* $XTermId: charsets.c,v 1.42 2011/09/11 14:40:17 tom Exp $ */

/*
 * Copyright 1998-2009,2011 by Thomas E. Dickey
 *
 *                         All Rights Reserved
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE ABOVE LISTED COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 * Except as contained in this notice, the name(s) of the above copyright
 * holders shall not be used in advertising or otherwise to promote the
 * sale, use or other dealings in this Software without prior written
 * authorization.
 *
 */

#include <xterm.h>
#include <data.h>
#include <fontutils.h>

#include <X11/keysym.h>

/*
 * This module performs translation as needed to support the DEC VT220 national
 * replacement character sets.  We assume that xterm's font is based on the ISO
 * 8859-1 (Latin 1) character set, which is almost the same as the DEC
 * multinational character set.  Glyph positions 0-31 have to be the DEC
 * graphic characters, though.
 *
 * References:
 *	"VT220 Programmer Pocket Guide" EK-VT220-HR-002 (2nd ed., 1984), which
 *		contains character charts for the national character sets.
 *	"VT330/VT340 Programmer Reference Manual Volume 1: Text Programming"
 *		EK-VT3XX-TP-001 (1st ed, 1987), which contains a table (2-1)
 *		listing the glyphs which are mapped from the multinational
 *		character set to the national character set.
 *
 * The latter reference, though easier to read, has a few errors and omissions.
 */

/*
 * Translate an input keysym to the corresponding NRC keysym.
 */
unsigned
xtermCharSetIn(unsigned code, int charset)
{
#define MAP(to, from) case from: code = to; break

    if (code >= 128 && code < 256) {
	switch (charset) {
	case 'A':		/* United Kingdom set (or Latin 1)      */
	    if (code == XK_sterling)
		code = 0x23;
	    code &= 0x7f;
	    break;

#if OPT_XMC_GLITCH
	case '?':
#endif
	case '1':		/* Alternate Character ROM standard characters */
	case '2':		/* Alternate Character ROM special graphics */
	case 'B':		/* ASCII set                            */
	    break;

	case '0':		/* special graphics (line drawing)      */
	    break;

	case '4':		/* Dutch */
	    switch (code) {
		MAP(0x23, XK_sterling);
		MAP(0x40, XK_threequarters);
		MAP(0x5b, XK_ydiaeresis);
		MAP(0x5c, XK_onehalf);
		MAP(0x5d, XK_bar);	/* glyph is not ISO-8859-1 */
		MAP(0x7b, XK_diaeresis);
		MAP(0x7c, XK_f);	/* glyph is not ISO-8859-1 */
		MAP(0x7d, XK_onequarter);
		MAP(0x7e, XK_acute);
	    }
	    break;

	case 'C':
	case '5':		/* Finnish */
	    switch (code) {
		MAP(0x5b, XK_Adiaeresis);
		MAP(0x5c, XK_Odiaeresis);
		MAP(0x5d, XK_Aring);
		MAP(0x5e, XK_Udiaeresis);
		MAP(0x60, XK_eacute);
		MAP(0x7b, XK_adiaeresis);
		MAP(0x7c, XK_odiaeresis);
		MAP(0x7d, XK_aring);
		MAP(0x7e, XK_udiaeresis);
	    }
	    break;

	case 'R':		/* French */
	    switch (code) {
		MAP(0x23, XK_sterling);
		MAP(0x40, XK_agrave);
		MAP(0x5b, XK_degree);
		MAP(0x5c, XK_ccedilla);
		MAP(0x5d, XK_section);
		MAP(0x7b, XK_eacute);
		MAP(0x7c, XK_ugrave);
		MAP(0x7d, XK_egrave);
		MAP(0x7e, XK_diaeresis);
	    }
	    break;

	case 'Q':		/* French Canadian */
	    switch (code) {
		MAP(0x40, XK_agrave);
		MAP(0x5b, XK_acircumflex);
		MAP(0x5c, XK_ccedilla);
		MAP(0x5d, XK_ecircumflex);
		MAP(0x5e, XK_icircumflex);
		MAP(0x60, XK_ocircumflex);
		MAP(0x7b, XK_eacute);
		MAP(0x7c, XK_ugrave);
		MAP(0x7d, XK_egrave);
		MAP(0x7e, XK_ucircumflex);
	    }
	    break;

	case 'K':		/* German */
	    switch (code) {
		MAP(0x40, XK_section);
		MAP(0x5b, XK_Adiaeresis);
		MAP(0x5c, XK_Odiaeresis);
		MAP(0x5d, XK_Udiaeresis);
		MAP(0x7b, XK_adiaeresis);
		MAP(0x7c, XK_odiaeresis);
		MAP(0x7d, XK_udiaeresis);
		MAP(0x7e, XK_ssharp);
	    }
	    break;

	case 'Y':		/* Italian */
	    switch (code) {
		MAP(0x23, XK_sterling);
		MAP(0x40, XK_section);
		MAP(0x5b, XK_degree);
		MAP(0x5c, XK_ccedilla);
		MAP(0x5d, XK_eacute);
		MAP(0x60, XK_ugrave);
		MAP(0x7b, XK_agrave);
		MAP(0x7c, XK_ograve);
		MAP(0x7d, XK_egrave);
		MAP(0x7e, XK_igrave);
	    }
	    break;

	case 'E':
	case '6':		/* Norwegian/Danish */
	    switch (code) {
		MAP(0x40, XK_Adiaeresis);
		MAP(0x5b, XK_AE);
		MAP(0x5c, XK_Ooblique);
		MAP(0x5d, XK_Aring);
		MAP(0x5e, XK_Udiaeresis);
		MAP(0x60, XK_adiaeresis);
		MAP(0x7b, XK_ae);
		MAP(0x7c, XK_oslash);
		MAP(0x7d, XK_aring);
		MAP(0x7e, XK_udiaeresis);
	    }
	    break;

	case 'Z':		/* Spanish */
	    switch (code) {
		MAP(0x23, XK_sterling);
		MAP(0x40, XK_section);
		MAP(0x5b, XK_exclamdown);
		MAP(0x5c, XK_Ntilde);
		MAP(0x5d, XK_questiondown);
		MAP(0x7b, XK_degree);
		MAP(0x7c, XK_ntilde);
		MAP(0x7d, XK_ccedilla);
	    }
	    break;

	case 'H':
	case '7':		/* Swedish */
	    switch (code) {
		MAP(0x40, XK_Eacute);
		MAP(0x5b, XK_Adiaeresis);
		MAP(0x5c, XK_Odiaeresis);
		MAP(0x5d, XK_Aring);
		MAP(0x5e, XK_Udiaeresis);
		MAP(0x60, XK_eacute);
		MAP(0x7b, XK_adiaeresis);
		MAP(0x7c, XK_odiaeresis);
		MAP(0x7d, XK_aring);
		MAP(0x7e, XK_udiaeresis);
	    }
	    break;

	case '=':		/* Swiss */
	    switch (code) {
		MAP(0x23, XK_ugrave);
		MAP(0x40, XK_agrave);
		MAP(0x5b, XK_eacute);
		MAP(0x5c, XK_ccedilla);
		MAP(0x5d, XK_ecircumflex);
		MAP(0x5e, XK_icircumflex);
		MAP(0x5f, XK_egrave);
		MAP(0x60, XK_ocircumflex);
		MAP(0x7b, XK_adiaeresis);
		MAP(0x7c, XK_odiaeresis);
		MAP(0x7d, XK_udiaeresis);
		MAP(0x7e, XK_ucircumflex);
	    }
	    break;

	default:		/* any character sets we don't recognize */
	    break;
	}
	code &= 0x7f;		/* NRC in any case is 7-bit */
    }
    return code;
#undef MAP
}

/*
 * Translate a string to the display form.  This assumes the font has the
 * DEC graphic characters in cells 0-31, and otherwise is ISO-8859-1.
 */
int
xtermCharSetOut(XtermWidget xw, IChar * buf, IChar * ptr, int leftset)
{
    IChar *s;
    TScreen *screen = TScreenOf(xw);
    int count = 0;
    int rightset = screen->gsets[(int) (screen->curgr)];

#define MAP(from, to) case from: chr = to; break

    TRACE(("CHARSET GL=%c(G%d) GR=%c(G%d) SS%d\n\t%s\n",
	   leftset, screen->curgl,
	   rightset, screen->curgr,
	   screen->curss,
	   visibleIChar(buf, (unsigned) (ptr - buf))));

    for (s = buf; s < ptr; ++s) {
	int eight = CharOf(E2A(*s));
	int seven = eight & 0x7f;
	int cs = (eight >= 128) ? rightset : leftset;
	int chr = eight;

	count++;
#if OPT_WIDE_CHARS
	/*
	 * This is only partly right - prevent inadvertant remapping of
	 * the replacement character and other non-8bit codes into bogus
	 * 8bit codes.
	 */
	if (screen->utf8_mode) {
	    if (*s > 255)
		continue;
	}
#endif
	switch (cs) {
	case 'A':		/* United Kingdom set (or Latin 1)      */
	    if ((xw->flags & NATIONAL)
		|| (screen->vtXX_level <= 1)) {
		if (chr == 0x23) {
#if OPT_WIDE_CHARS
		    chr = (screen->utf8_mode
			   ? 0xa3
			   : XTERM_POUND);
#else
		    chr = XTERM_POUND;
#endif
		}
	    } else {
		chr = (seven | 0x80);
	    }
	    break;

#if OPT_XMC_GLITCH
	case '?':
#endif
	case '1':		/* Alternate Character ROM standard characters */
	case '2':		/* Alternate Character ROM special graphics */
	case 'B':		/* ASCII set                            */
	    break;

	case '0':		/* special graphics (line drawing)      */
	    if (seven > 0x5f && seven <= 0x7e) {
#if OPT_WIDE_CHARS
		if (screen->utf8_mode)
		    chr = (int) dec2ucs((unsigned) (seven - 0x5f));
		else
#endif
		    chr = seven - 0x5f;
	    } else {
		chr = seven;
	    }
	    break;

	case '4':		/* Dutch */
	    switch (chr = seven) {
		MAP(0x23, XK_sterling);
		MAP(0x40, XK_threequarters);
		MAP(0x5b, XK_ydiaeresis);
		MAP(0x5c, XK_onehalf);
		MAP(0x5d, XK_bar);
		MAP(0x7b, XK_diaeresis);
		MAP(0x7c, XK_f);
		MAP(0x7d, XK_onequarter);
		MAP(0x7e, XK_acute);
	    }
	    break;

	case 'C':
	case '5':		/* Finnish */
	    switch (chr = seven) {
		MAP(0x5b, XK_Adiaeresis);
		MAP(0x5c, XK_Odiaeresis);
		MAP(0x5d, XK_Aring);
		MAP(0x5e, XK_Udiaeresis);
		MAP(0x60, XK_eacute);
		MAP(0x7b, XK_adiaeresis);
		MAP(0x7c, XK_odiaeresis);
		MAP(0x7d, XK_aring);
		MAP(0x7e, XK_udiaeresis);
	    }
	    break;

	case 'R':		/* French */
	    switch (chr = seven) {
		MAP(0x23, XK_sterling);
		MAP(0x40, XK_agrave);
		MAP(0x5b, XK_degree);
		MAP(0x5c, XK_ccedilla);
		MAP(0x5d, XK_section);
		MAP(0x7b, XK_eacute);
		MAP(0x7c, XK_ugrave);
		MAP(0x7d, XK_egrave);
		MAP(0x7e, XK_diaeresis);
	    }
	    break;

	case 'Q':		/* French Canadian */
	    switch (chr = seven) {
		MAP(0x40, XK_agrave);
		MAP(0x5b, XK_acircumflex);
		MAP(0x5c, XK_ccedilla);
		MAP(0x5d, XK_ecircumflex);
		MAP(0x5e, XK_icircumflex);
		MAP(0x60, XK_ocircumflex);
		MAP(0x7b, XK_eacute);
		MAP(0x7c, XK_ugrave);
		MAP(0x7d, XK_egrave);
		MAP(0x7e, XK_ucircumflex);
	    }
	    break;

	case 'K':		/* German */
	    switch (chr = seven) {
		MAP(0x40, XK_section);
		MAP(0x5b, XK_Adiaeresis);
		MAP(0x5c, XK_Odiaeresis);
		MAP(0x5d, XK_Udiaeresis);
		MAP(0x7b, XK_adiaeresis);
		MAP(0x7c, XK_odiaeresis);
		MAP(0x7d, XK_udiaeresis);
		MAP(0x7e, XK_ssharp);
	    }
	    break;

	case 'Y':		/* Italian */
	    switch (chr = seven) {
		MAP(0x23, XK_sterling);
		MAP(0x40, XK_section);
		MAP(0x5b, XK_degree);
		MAP(0x5c, XK_ccedilla);
		MAP(0x5d, XK_eacute);
		MAP(0x60, XK_ugrave);
		MAP(0x7b, XK_agrave);
		MAP(0x7c, XK_ograve);
		MAP(0x7d, XK_egrave);
		MAP(0x7e, XK_igrave);
	    }
	    break;

	case 'E':
	case '6':		/* Norwegian/Danish */
	    switch (chr = seven) {
		MAP(0x40, XK_Adiaeresis);
		MAP(0x5b, XK_AE);
		MAP(0x5c, XK_Ooblique);
		MAP(0x5d, XK_Aring);
		MAP(0x5e, XK_Udiaeresis);
		MAP(0x60, XK_adiaeresis);
		MAP(0x7b, XK_ae);
		MAP(0x7c, XK_oslash);
		MAP(0x7d, XK_aring);
		MAP(0x7e, XK_udiaeresis);
	    }
	    break;

	case 'Z':		/* Spanish */
	    switch (chr = seven) {
		MAP(0x23, XK_sterling);
		MAP(0x40, XK_section);
		MAP(0x5b, XK_exclamdown);
		MAP(0x5c, XK_Ntilde);
		MAP(0x5d, XK_questiondown);
		MAP(0x7b, XK_degree);
		MAP(0x7c, XK_ntilde);
		MAP(0x7d, XK_ccedilla);
	    }
	    break;

	case 'H':
	case '7':		/* Swedish */
	    switch (chr = seven) {
		MAP(0x40, XK_Eacute);
		MAP(0x5b, XK_Adiaeresis);
		MAP(0x5c, XK_Odiaeresis);
		MAP(0x5d, XK_Aring);
		MAP(0x5e, XK_Udiaeresis);
		MAP(0x60, XK_eacute);
		MAP(0x7b, XK_adiaeresis);
		MAP(0x7c, XK_odiaeresis);
		MAP(0x7d, XK_aring);
		MAP(0x7e, XK_udiaeresis);
	    }
	    break;

	case '=':		/* Swiss */
	    switch (chr = seven) {
		MAP(0x23, XK_ugrave);
		MAP(0x40, XK_agrave);
		MAP(0x5b, XK_eacute);
		MAP(0x5c, XK_ccedilla);
		MAP(0x5d, XK_ecircumflex);
		MAP(0x5e, XK_icircumflex);
		MAP(0x5f, XK_egrave);
		MAP(0x60, XK_ocircumflex);
		MAP(0x7b, XK_adiaeresis);
		MAP(0x7c, XK_odiaeresis);
		MAP(0x7d, XK_udiaeresis);
		MAP(0x7e, XK_ucircumflex);
	    }
	    break;

	default:		/* any character sets we don't recognize */
	    count--;
	    break;
	}
	/*
	 * The state machine already treated DEL as a nonprinting and
	 * nonspacing character.  If we have DEL now, simply render
	 * it as a blank.
	 */
	if (chr == ANSI_DEL)
	    chr = ' ';
	*s = (IChar) A2E(chr);
    }
    TRACE(("%d\t%s\n",
	   count,
	   visibleIChar(buf, (unsigned) (ptr - buf))));
    return count;
#undef MAP
}