/*
 * xdm - display manager daemon
 *
 * $XConsortium: dpylist.c,v 1.11 89/09/09 13:01:10 keith Exp $
 *
 * Copyright 1988 Massachusetts Institute of Technology
 *
 * 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 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.
 *
 * Author:  Keith Packard, MIT X Consortium
 */

/*
 * a simple linked list of known displays
 */

# include "dm.h"

struct display	*displays;

extern void	free ();

AnyDisplaysLeft ()
{
	return displays != (struct display *) 0;
}

ForEachDisplay (f)
	void	(*f)();
{
	struct display	*d, *next;

	for (d = displays; d; d = next) {
		next = d->next;
		(*f) (d);
	}
}

struct display *
FindDisplayByName (name)
char	*name;
{
	struct display	*d;

	for (d = displays; d; d = d->next)
		if (!strcmp (name, d->name))
			return d;
	return 0;
}

struct display *
FindDisplayByPid (pid)
int	pid;
{
	struct display	*d;

	for (d = displays; d; d = d->next)
		if (pid == d->pid)
			return d;
	return 0;
}

struct display *
FindDisplayBySessionID (sessionID)
    CARD32  sessionID;
{
    struct display	*d;

    for (d = displays; d; d = d->next)
	if (sessionID == d->sessionID)
	    return d;
    return 0;
}

struct display *
FindDisplayByAddress (addr, addrlen, displayNumber)
    struct sockaddr *addr;
    int		    addrlen;
    CARD16	    displayNumber;
{
    struct display  *d;

    for (d = displays; d; d = d->next)
	if (d->displayType.origin == FromXDMCP &&
	    d->displayNumber == displayNumber &&
	    addressEqual (d->from, d->fromlen, addr, addrlen))
	{
	    return d;
	}
    return 0;
}

RemoveDisplay (old)
struct display	*old;
{
	struct display	*d, *p;

	p = 0;
	for (d = displays; d; d = d->next) {
		if (d == old) {
			if (p)
				p->next = d->next;
			else
				displays = d->next;
			free ((char *) d);
			break;
		}
		p = d;
	}
}

struct display *
NewDisplay (name, class)
char		*name;
char		*class;
{
	struct display	*d;

	d = (struct display *) malloc (sizeof (struct display));
	if (!d) {
		LogOutOfMem ("NewDisplay");
		return 0;
	}
	d->next = displays;
	d->name = malloc ((unsigned) (strlen (name) + 1));
	if (!d->name) {
		LogOutOfMem ("NewDisplay");
		free ((char *) d);
		return 0;
	}
	strcpy (d->name, name);
	if (class)
	{
		d->class = malloc ((unsigned) (strlen (class) + 1));
		if (!d->class) {
			LogOutOfMem ("NewDisplay");
			free (d->name);
			free ((char *) d);
			return 0;
		}
		strcpy (d->class, class);
	}
	else
	{
		d->class = (char *) 0;
	}
	d->argv = 0;
	d->status = notRunning;
	d->pid = -1;
	d->state = NewEntry;
	d->authorization = 0;
	d->from = 0;
	d->fromlen = 0;
	d->peer = 0;
	d->peerlen = 0;
	displays = d;
	return d;
}