xkeysymstr.c

早期freebsd实现

/* $XConsortium: XKeysymStr.c,v 11.7 91/05/04 14:03:22 rws Exp $ */
/* Copyright 1990 Massachusetts Institute of Technology */

/*
Permission to use, copy, modify, distribute, and sell this software and its
documentation for any purpose is hereby granted without fee, provided that
the above copyright notice appear in all copies and that both that
copyright notice and this permission notice appear in supporting
documentation, and that the name of M.I.T. not be used in advertising or
publicity pertaining to distribution of the software without specific,
written prior permission.  M.I.T. makes no representations about the
suitability of this software for any purpose.  It is provided "as is"
without express or implied warranty.
*/

#include "Xlibint.h"
#include <X11/Xresource.h>
#include <X11/keysymdef.h>

#if __STDC__
#define Const const
#else
#define Const /**/
#endif

typedef unsigned long Signature;

#define NEEDVTABLE
#include "ks_tables.h"

extern XrmDatabase _XInitKeysymDB();
extern Const unsigned char _XkeyTable[];


typedef struct _GRNData {
    char *name;
    XrmRepresentation type;
    XrmValuePtr value;
} GRNData;

/*ARGSUSED*/
static Bool SameValue(db, bindings, quarks, type, value, data)
    XrmDatabase		*db;
    XrmBindingList      bindings;
    XrmQuarkList	quarks;
    XrmRepresentation   *type;
    XrmValuePtr		value;
    XPointer		data;
{
    GRNData *gd = (GRNData *)data;

    if ((*type == gd->type) && (value->size == gd->value->size) &&
	!strncmp((char *)value->addr, (char *)gd->value->addr, value->size))
    {
	gd->name = XrmQuarkToString(*quarks); /* XXX */
	return True;
    }
    return False;
}

char *XKeysymToString(ks)
    KeySym ks;
{
    register int i, n;
    int h;
    register int idx;
    Const unsigned char *entry;
    unsigned char val1, val2;
    XrmDatabase keysymdb;

    if (!ks)
	return ((char *)NULL);
    if (ks == XK_VoidSymbol)
	ks = 0;
    if (ks <= 0xffff)
    {
	val1 = ks >> 8;
	val2 = ks & 0xff;
	i = ks % VTABLESIZE;
	h = i + 1;
	n = VMAXHASH;
	while (idx = hashKeysym[i])
	{
	    entry = &_XkeyTable[idx];
	    if ((entry[0] == val1) && (entry[1] == val2))
		return ((char *)entry + 2);
	    if (!--n)
		break;
	    i += h;
	    if (i >= VTABLESIZE)
		i -= VTABLESIZE;
	}
    }

    if (keysymdb = _XInitKeysymDB())
    {
	char buf[9];
	XrmValue resval;
	XrmQuark empty = NULLQUARK;
	GRNData data;

	sprintf(buf, "%lX", ks);
	resval.addr = (XPointer)buf;
	resval.size = strlen(buf) + 1;
	data.name = (char *)NULL;
	data.type = XrmPermStringToQuark("String");
	data.value = &resval;
	(void)XrmEnumerateDatabase(keysymdb, &empty, &empty, XrmEnumAllLevels,
				   SameValue, (XPointer)&data);
	return data.name;
    }
    return ((char *) NULL);
}