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/* $XConsortium$ */
/******************************************************************************/
/* (c) Copyright Hewlett-Packard Company, 1992, Fort Collins, Colorado */
/* */
/* 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 notices appear in all copies and that both the */
/* copyright notices and this permission notice appear in supporting */
/* documentation, and that the name of Hewlett-Packard not be used in */
/* advertising or publicity pertaining to distribution of the software */
/* without specific, written prior permission. */
/* */
/* HEWLETT-PACKARD MAKES NO WARRANTY OF ANY KIND WITH REGARD TO THIS */
/* SOFTWARE, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF */
/* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Hewlett-Packard */
/* shall not be liable for errors contained herein or direct, indirect, */
/* special, incidental or consequential damages in connection with the */
/* furnishing, performance or use of this software. */
/* */
/******************************************************************************/
/******************************************************************************/
/* */
/* Module: PEXlib Double-Buffer Utilities */
/* */
/* File Content: */
/* This file contains source code for data management functions used by the */
/* PEXlib double-buffer utilities. */
/* */
/******************************************************************************/
/*
** Include files
*/
#include <X11/PEX5/PEXlib.h>
#include "pexutdbint.h"
/*
** Global internal data
*/
static PEXUtDBData *pexutdb_head = (PEXUtDBData *)NULL; /* modified by all */
/* *_node functions */
/******************************************************************************/
/* */
/* lookup_node */
/* */
/******************************************************************************/
PEXUtDBData *lookup_node( win, dpy )
Window win;
Display *dpy;
{
PEXUtDBData *ptr;
ptr = pexutdb_head;
while ( ptr != (PEXUtDBData *)NULL ) {
if ( ( ptr->window != win ) || ( ptr->display != dpy ) )
ptr = ptr->next;
else
break;
}
return( ptr );
}
/******************************************************************************/
/* */
/* add_node */
/* */
/******************************************************************************/
PEXUtDBData *add_node( win, dpy )
Window win;
Display *dpy;
{
PEXUtDBData *ptr;
if ( pexutdb_head == (PEXUtDBData *)NULL ) {
/*
** if no data, create a new list of nodes
*/
ptr = (PEXUtDBData *)malloc( sizeof( PEXUtDBData ) );
if ( ptr == (PEXUtDBData *)NULL )
return( ptr );
ptr->next = (PEXUtDBData *)NULL;
} else {
/*
** check for existing node with matching search keys
*/
ptr = pexutdb_head;
while ( ptr != (PEXUtDBData *)NULL ) {
if ( ( ptr->window == win ) && ( ptr->display == dpy ) )
return( (PEXUtDBData *)NULL );
ptr = ptr->next;
}
/*
** allocate new node
*/
ptr = (PEXUtDBData *)malloc( sizeof( PEXUtDBData ) );
if ( ptr == (PEXUtDBData *)NULL )
return( ptr );
/*
** add the new data node at the beginning of the list;
** this optimizes searches for the most recent additions
*/
ptr->next = pexutdb_head;
}
pexutdb_head = ptr;
return( ptr );
}
/******************************************************************************/
/* */
/* delete_node */
/* */
/******************************************************************************/
void delete_node( win, dpy )
Window win;
Display *dpy;
{
PEXUtDBData *ptr, *prev;
if ( pexutdb_head == (PEXUtDBData *)NULL )
return;
/*
** first, need to find the previous node
*/
ptr = pexutdb_head;
prev = pexutdb_head;
while ( ptr != (PEXUtDBData *)NULL ) {
if ( ( ptr->window != win ) || ( ptr->display != dpy ) ) {
prev = ptr;
ptr = ptr->next;
} else
break;
}
/*
** now, we have the previous node;
** point the previous node to the node after the node we are deleting
*/
if ( ptr == pexutdb_head )
pexutdb_head = ptr->next;
else
prev->next = ptr->next;
/*
** now, free the node
*/
free( ptr );
}
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