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+/* $Xorg: xkbatom.c,v 1.4 2001/02/09 02:04:05 xorgcvs Exp $ */
+/***********************************************************
+
+Copyright 1987, 1998 The Open Group
+
+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.
+
+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
+OPEN GROUP 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 of The Open Group shall not be
+used in advertising or otherwise to promote the sale, use or other dealings
+in this Software without prior written authorization from The Open Group.
+
+
+Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.
+
+ All Rights Reserved
+
+Permission to use, copy, modify, and distribute this software and its
+documentation for any purpose and without fee is hereby granted,
+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 Digital not be
+used in advertising or publicity pertaining to distribution of the
+software without specific, written prior permission.
+
+DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
+ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
+DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
+ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
+ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
+SOFTWARE.
+
+******************************************************************/
+
+/************************************************************
+ Copyright 1994 by Silicon Graphics Computer Systems, Inc.
+
+ Permission to use, copy, modify, and distribute this
+ software and its documentation for any purpose and without
+ fee is hereby granted, 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 Silicon Graphics not be
+ used in advertising or publicity pertaining to distribution
+ of the software without specific prior written permission.
+ Silicon Graphics makes no representation about the suitability
+ of this software for any purpose. It is provided "as is"
+ without any express or implied warranty.
+
+ SILICON GRAPHICS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
+ SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+ AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SILICON
+ GRAPHICS BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
+ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
+ DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+ OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH
+ THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+ ********************************************************/
+
+#include <stdio.h>
+#include <ctype.h>
+#ifndef X_NOT_STDC_ENV
+#include <stdlib.h>
+#endif
+#include <X11/Xos.h>
+#include <X11/Xlib.h>
+#include <X11/XKBlib.h>
+
+#include "XKMformat.h"
+#include "XKBfileInt.h"
+
+/***====================================================================***/
+
+#define InitialTableSize 100
+
+typedef struct _Node {
+ struct _Node *left, *right;
+ Atom a;
+ unsigned int fingerPrint;
+ char *string;
+} NodeRec, *NodePtr;
+
+#define BAD_RESOURCE 0xe0000000
+
+static Atom lastAtom = None;
+static NodePtr atomRoot = (NodePtr)NULL;
+static unsigned long tableLength;
+static NodePtr *nodeTable;
+
+static Atom
+#if NeedFunctionPrototypes
+_XkbMakeAtom(char *string,unsigned len,Bool makeit)
+#else
+_XkbMakeAtom(string, len, makeit)
+ char *string;
+ unsigned len;
+ Bool makeit;
+#endif
+{
+ register NodePtr * np;
+ unsigned i;
+ int comp;
+ register unsigned int fp = 0;
+
+ np = &atomRoot;
+ for (i = 0; i < (len+1)/2; i++)
+ {
+ fp = fp * 27 + string[i];
+ fp = fp * 27 + string[len - 1 - i];
+ }
+ while (*np != (NodePtr) NULL)
+ {
+ if (fp < (*np)->fingerPrint)
+ np = &((*np)->left);
+ else if (fp > (*np)->fingerPrint)
+ np = &((*np)->right);
+ else
+ { /* now start testing the strings */
+ comp = strncmp(string, (*np)->string, (int)len);
+ if ((comp < 0) || ((comp == 0) && (len < strlen((*np)->string))))
+ np = &((*np)->left);
+ else if (comp > 0)
+ np = &((*np)->right);
+ else
+ return(*np)->a;
+ }
+ }
+ if (makeit)
+ {
+ register NodePtr nd;
+
+ nd = (NodePtr) _XkbAlloc(sizeof(NodeRec));
+ if (!nd)
+ return BAD_RESOURCE;
+ nd->string = (char *) _XkbAlloc(len + 1);
+ if (!nd->string) {
+ _XkbFree(nd);
+ return BAD_RESOURCE;
+ }
+ strncpy(nd->string, string, (int)len);
+ nd->string[len] = 0;
+ if ((lastAtom + 1) >= tableLength) {
+ NodePtr *table;
+
+ table = (NodePtr *) _XkbRealloc(nodeTable,
+ tableLength * (2 * sizeof(NodePtr)));
+ if (!table) {
+ if (nd->string != string)
+ _XkbFree(nd->string);
+ _XkbFree(nd);
+ return BAD_RESOURCE;
+ }
+ tableLength <<= 1;
+ nodeTable = table;
+ }
+ *np = nd;
+ nd->left = nd->right = (NodePtr) NULL;
+ nd->fingerPrint = fp;
+ nd->a = (++lastAtom);
+ *(nodeTable+lastAtom) = nd;
+ return nd->a;
+ }
+ else
+ return None;
+}
+
+static char *
+#if NeedFunctionPrototypes
+_XkbNameForAtom(Atom atom)
+#else
+_XkbNameForAtom(atom)
+ Atom atom;
+#endif
+{
+ NodePtr node;
+ if (atom > lastAtom) return 0;
+ if ((node = nodeTable[atom]) == (NodePtr)NULL) return 0;
+ return node->string;
+}
+
+static void
+#if NeedFunctionPrototypes
+_XkbInitAtoms(void)
+#else
+_XkbInitAtoms()
+#endif
+{
+ tableLength = InitialTableSize;
+ nodeTable = (NodePtr *)_XkbAlloc(InitialTableSize*sizeof(NodePtr));
+ nodeTable[None] = (NodePtr)NULL;
+}
+
+/***====================================================================***/
+
+char *
+#if NeedFunctionPrototypes
+XkbAtomGetString(Display *dpy,Atom atm)
+#else
+XkbAtomGetString(dpy,atm)
+ Display * dpy;
+ Atom atm;
+#endif
+{
+ if (atm==None)
+ return NULL;
+ if (dpy==NULL)
+ return _XkbNameForAtom(atm);
+ return XGetAtomName(dpy,atm);
+}
+
+/***====================================================================***/
+
+Atom
+#if NeedFunctionPrototypes
+XkbInternAtom(Display *dpy,char *name,Bool onlyIfExists)
+#else
+XkbInternAtom(dpy,name,onlyIfExists)
+ Display * dpy;
+ char * name;
+ Bool onlyIfExists;
+#endif
+{
+ if (name==NULL)
+ return None;
+ if (dpy==NULL) {
+ return _XkbMakeAtom(name, strlen(name), (!onlyIfExists));
+ }
+ return XInternAtom(dpy,name,onlyIfExists);
+}
+
+/***====================================================================***/
+
+Atom
+#if NeedFunctionPrototypes
+XkbChangeAtomDisplay(Display *oldDpy,Display *newDpy,Atom atm)
+#else
+XkbChangeAtomDisplay(oldDpy,newDpy,atm)
+ Display * oldDpy;
+ Display * newDpy;
+ Atom atm;
+#endif
+{
+char *tmp;
+
+ if (atm!=None) {
+ tmp= XkbAtomGetString(oldDpy,atm);
+ if (tmp!=NULL)
+ return XkbInternAtom(newDpy,tmp,False);
+ }
+ return None;
+}
+
+/***====================================================================***/
+
+void
+#if NeedFunctionPrototypes
+XkbInitAtoms(Display *dpy)
+#else
+XkbInitAtoms(dpy)
+ Display *dpy;
+#endif
+{
+static int been_here= 0;
+ if ((dpy==NULL)&&(!been_here)) {
+ _XkbInitAtoms();
+ been_here= 1;
+ }
+ return;
+}
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