/*
 * misc utility routines
 */
/*
 
Copyright 1990, 1991, 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 1990, 1991 Network Computing Devices;
 * Portions Copyright 1987 by Digital Equipment Corporation 
 *
 * 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 names of Network Computing Devices, or Digital
 * not be used in advertising or publicity pertaining to distribution
 * of the software without specific, written prior permission.
 *
 * NETWORK COMPUTING DEVICES, AND DIGITAL DISCLAIM ALL WARRANTIES WITH
 * REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL NETWORK COMPUTING DEVICES,
 * OR 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.
 */

#include	"config.h"

#define	XK_LATIN1

#include	<difsutils.h>

#include	<stdio.h>
#include	<ctype.h>
#include	"misc.h"
#include	"globals.h"
#include	"clientstr.h"
#include	<X11/fonts/fontstruct.h>
#include	<X11/keysymdef.h>

#include	"authstr.h"
#include	"auth.h"
#include	"client.h"
#include	"dispatch.h"

static FontResolutionPtr default_resolutions;
static int  num_resolutions;
static int  default_point_size = 120;

AuthContextPtr
GetClientAuthorization(void)
{
    return currentClient->auth;
}

void
SetDefaultPointSize(int ps)
{
    int         i;

    default_point_size = ps;
    for (i = 0; i < num_resolutions; i++)
	default_resolutions[i].point_size = ps;
}

int
SetDefaultResolutions(char *str)
{
    int         num,
                numr = 0,
                n;
    char       *s;
    FontResolutionPtr new,
                nr;
    int         state;

    s = str;
    while (*s) {		/* count commas */
	if (*s == ',')
	    numr++;
	s++;
    }

    if ((numr % 2) != 1) {	/* must be multiple of 2 + 1 */
	return FSBadResolution;
    }
    numr = (numr + 1) / 2;
    nr = new = (FontResolutionPtr) fsalloc(sizeof(FontResolutionRec)
					   * numr);
    if (!new)
	return FSBadAlloc;
    s = str;
    num = 0;
    state = 0;
    while (*s) {
	if (*s == ',') {
	    if (state == 0) {
		nr->x_resolution = num;
		state++;
	    } else {
		state = 0;
		nr->y_resolution = num;
		nr->point_size = default_point_size;
		nr++;
	    }
	    num = 0;
	    s++;
	    continue;
	}
	if (!isdigit(*s)) {
	    fsfree((char *) new);
	    return FSBadResolution;
	}
	n = *s - '0';
	num = num * 10 + n;
	s++;
    }

    /* do the last one */
    assert(state == 1);
    nr->y_resolution = num;
    nr->point_size = default_point_size;

    if (default_resolutions) {
	fsfree((char *) default_resolutions);
    }
    default_resolutions = new;
    num_resolutions = numr;
    return FSSuccess;
}

FontResolutionPtr
GetClientResolutions(int *num)
{
    /* return the client's if it has them, otherwise the default values */
    if (currentClient->num_resolutions) {
	*num = currentClient->num_resolutions;
	return (FontResolutionPtr) currentClient->resolutions;
    } else {
	*num = num_resolutions;
	return default_resolutions;
    }
}

int
GetDefaultPointSize(void)
{
    FontResolutionPtr res;
    int         num;

    res = GetClientResolutions(&num);
    if (res)
	return res->point_size;
    else
	return default_point_size;
}

int
strncmpnocase(
    const char *first,
    const char *second,
    int         n)
{
    register const unsigned char *ap,
               *bp;

    for (ap = (const unsigned char *) first,
	    bp = (const unsigned char *) second;
    /* SUPPRESS 112 */
	    n > 0 && *ap && *bp; n--, ap++, bp++) {
	register unsigned char a,
	            b;

	/* SUPPRESS 112 */
	if ((a = *ap) != (b = *bp)) {
	    /* try lowercasing and try again */

	    if ((a >= XK_A) && (a <= XK_Z))
		a += (XK_a - XK_A);
	    else if ((a >= XK_Agrave) && (a <= XK_Odiaeresis))
		a += (XK_agrave - XK_Agrave);
	    else if ((a >= XK_Ooblique) && (a <= XK_Thorn))
		a += (XK_oslash - XK_Ooblique);

	    if ((b >= XK_A) && (b <= XK_Z))
		b += (XK_a - XK_A);
	    else if ((b >= XK_Agrave) && (b <= XK_Odiaeresis))
		b += (XK_agrave - XK_Agrave);
	    else if ((b >= XK_Ooblique) && (b <= XK_Thorn))
		b += (XK_oslash - XK_Ooblique);

	    if (a != b)
		break;
	}
    }
    /* SUPPRESS 112 */
    return (n ? (((int) *ap) - ((int) *bp)) : 0);
}

void
NoopDDA(void)
{
}

/* block & wakeup handlers */

typedef struct _BlockHandler {
    BlockHandlerProcPtr	BlockHandler;
    DifsWakeupFunc	WakeupHandler;
    pointer     	blockData;
    Bool        	deleted;
}           BlockHandlerRec, *BlockHandlerPtr;

static BlockHandlerPtr handlers;
static int  numHandlers;
static int  sizeHandlers;
static Bool inHandler;
static Bool handlerDeleted;

/* called from the OS layer */
void
BlockHandler(
    OSTimePtr   pTimeout,	/* DIX doesn't want to know how OS represents
				 * time */
    pointer     pReadmask)	/* nor how it represents the set of
				 * descriptors */
{
    register int i,
                j;

    ++inHandler;
    for (i = 0; i < numHandlers; i++)
	(*handlers[i].BlockHandler) (handlers[i].blockData,
				     pTimeout, pReadmask);
    if (handlerDeleted) {
	for (i = 0; i < numHandlers;)
	    if (handlers[i].deleted) {
		for (j = i; j < numHandlers - 1; j++)
		    handlers[j] = handlers[j + 1];
		numHandlers--;
	    } else
		i++;
    }
    --inHandler;
}


void
WakeupHandler(
    int		result,		/* result from the wait */
    unsigned long * pReadmask)	/* the resulting descriptor mask */
{
    register int i,
                j;

    ++inHandler;
    for (i = numHandlers - 1; i >= 0; i--)
	(*handlers[i].WakeupHandler) (handlers[i].blockData,
				      result, pReadmask);
    if (handlerDeleted) {
	for (i = 0; i < numHandlers;)
	    if (handlers[i].deleted) {
		for (j = i; j < numHandlers - 1; j++)
		    handlers[j] = handlers[j + 1];
		numHandlers--;
	    } else
		i++;
    }
    --inHandler;
}

/* Reentrant with BlockHandler and WakeupHandler, except wakeup won't
 * get called until next time
 */

Bool
RegisterBlockAndWakeupHandlers(
    BlockHandlerProcPtr blockHandler,
    DifsWakeupFunc wakeupHandler,
    pointer     blockData)
{
    BlockHandlerPtr new;

    if (numHandlers >= sizeHandlers) {
	new = (BlockHandlerPtr) fsrealloc(handlers, (numHandlers + 1) *
					  sizeof(BlockHandlerRec));
	if (!new)
	    return FALSE;
	handlers = new;
	sizeHandlers = numHandlers + 1;
    }
    handlers[numHandlers].BlockHandler = blockHandler;
    handlers[numHandlers].WakeupHandler = wakeupHandler;
    handlers[numHandlers].blockData = blockData;
    numHandlers = numHandlers + 1;
    return TRUE;
}

void
RemoveBlockAndWakeupHandlers(
    BlockHandlerProcPtr blockHandler,
    DifsWakeupFunc wakeupHandler,
    pointer     blockData)
{
    int         i;

    for (i = 0; i < numHandlers; i++)
	if (handlers[i].BlockHandler == blockHandler &&
		handlers[i].WakeupHandler == wakeupHandler &&
		handlers[i].blockData == blockData) {
	    if (inHandler) {
		handlerDeleted = TRUE;
		handlers[i].deleted = TRUE;
	    } else {
		for (; i < numHandlers - 1; i++)
		    handlers[i] = handlers[i + 1];
		numHandlers--;
	    }
	    break;
	}
}

void
InitBlockAndWakeupHandlers(void)
{
    fsfree(handlers);
    handlers = (BlockHandlerPtr) 0;
    numHandlers = 0;
    sizeHandlers = 0;
}

/*
 * A general work queue.  Perform some task before the server
 * sleeps for input.
 */

WorkQueuePtr workQueue;
static WorkQueuePtr *workQueueLast = &workQueue;

/* ARGSUSED */
void
ProcessWorkQueue(void)
{
    WorkQueuePtr q,
                n,
                p;

    p = NULL;
    /*
     * Scan the work queue once, calling each function.  Those which return
     * TRUE are removed from the queue, otherwise they will be called again.
     * This must be reentrant with QueueWorkProc, hence the crufty usage of
     * variables.
     */
    for (q = workQueue; q; q = n) {
	if ((*q->function) (q->client, q->closure)) {
	    /* remove q from the list */
	    n = q->next;	/* don't fetch until after func called */
	    if (p)
		p->next = n;
	    else
		workQueue = n;
	    fsfree(q);
	} else {
	    n = q->next;	/* don't fetch until after func called */
	    p = q;
	}
    }
    if (p)
	workQueueLast = &p->next;
    else {
	workQueueLast = &workQueue;
    }
}

Bool
QueueWorkProc(
    Bool        (*function) (ClientPtr, pointer),
    ClientPtr   client,
    pointer     data)
{
    WorkQueuePtr q;

    q = (WorkQueuePtr) fsalloc(sizeof *q);
    if (!q)
	return FALSE;
    q->function = function;
    q->client = client;
    q->closure = data;
    q->next = NULL;
    *workQueueLast = q;
    workQueueLast = &q->next;
    return TRUE;
}

/*
 * Manage a queue of sleeping clients, awakening them
 * when requested, by using the OS functions IgnoreClient
 * and AttendClient.  Note that this *ignores* the troubles
 * with request data interleaving itself with events, but
 * we'll leave that until a later time.
 */

typedef struct _SleepQueue {
    struct _SleepQueue *next;
    ClientPtr   client;
    Bool        (*function) (ClientPtr, pointer);
    pointer     closure;
}           SleepQueueRec, *SleepQueuePtr;

static SleepQueuePtr sleepQueue = NULL;

Bool
ClientSleep(
    ClientPtr   client,
    Bool        (*function) (ClientPtr, pointer),
    pointer     data)
{
    SleepQueuePtr q;

    q = (SleepQueuePtr) fsalloc(sizeof *q);
    if (!q)
	return FALSE;

    IgnoreClient(client);
    q->next = sleepQueue;
    q->client = client;
    q->function = function;
    q->closure = data;
    sleepQueue = q;
    return TRUE;
}

Bool
ClientSignal(ClientPtr client)
{
    SleepQueuePtr q;

    for (q = sleepQueue; q; q = q->next)
	if (q->client == client) {
	    return QueueWorkProc(q->function, q->client, q->closure);
	}
    return FALSE;
}

void
ClientWakeup(ClientPtr client)
{
    SleepQueuePtr q,
               *prev;

    prev = &sleepQueue;
    while ((q = *prev) != (SleepQueuePtr) 0) {
	if (q->client == client) {
	    *prev = q->next;
	    fsfree(q);
	    if (client->clientGone == CLIENT_GONE)
		CloseDownClient(client);
	    else
		AttendClient(client);
	    break;
	}
	prev = &q->next;
    }
}

Bool
ClientIsAsleep(ClientPtr client)
{
    SleepQueuePtr q;

    for (q = sleepQueue; q; q = q->next)
	if (q->client == client)
	    return TRUE;
    return FALSE;
}

pointer
Xalloc(unsigned long m)
{
    return fsalloc(m);
}

pointer
Xrealloc(pointer n, unsigned long m)
{
    return fsrealloc(n, m);
}

void
Xfree(unsigned long *n)
{
    fsfree(n);
}

pointer
Xcalloc(unsigned long n)
{
    pointer ret;

    ret = fsalloc(n);
    if (ret && n)
	bzero(ret, n);
    return ret;
}

int
set_font_authorizations(char **authorizations, int *authlen, ClientPtr client)
{
#define AUTH1_NAME "hp-hostname-1"
#define AUTH2_NAME "hp-printername-1"
    static char result[1024];
    char *p;
    AuthContextPtr acp = client->auth;
    int len1, len2;

    if (acp != NULL && acp->authname != NULL && acp->authdata != NULL &&
	(!strcmp(AUTH1_NAME, acp->authname) ||
	 !strcmp(AUTH2_NAME, acp->authname)) &&
	(len1 = strlen(acp->authname) + 1) +
	(len2 = strlen(acp->authdata) + 1) + 2 * sizeof(short) <= 1024)
    {
	p = result;
	*p++ = len1 >> 8;
	*p++ = len1 &0xff;
	*p++ = len2 >> 8;
	*p++ = len2 & 0xff;
	memmove( p, acp->authname, len1);
	p += len1;
	memmove( p, acp->authdata, len2);
	p += len2;
	*authlen = p - result;
	*authorizations = result;
	return 1;
    }

    *authlen = 0;
    return 0;
}

int
client_auth_generation(ClientPtr client)
{
    return client->auth_generation;
}
