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comm16.c

/*
 * DEC 93 Erik Bos <erik@xs4all.nl>
 *
 * Copyright 1996 Marcus Meissner
 *
 * Copyright 2001 Mike McCormack
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 *
 * History:
 *
 * Mar 31, 1999. Ove Kåven <ovek@arcticnet.no>
 * - Implemented buffers and EnableCommNotification.
 *
 * Apr 3, 1999.  Lawson Whitney <lawson_whitney@juno.com>
 * - Fixed the modem control part of EscapeCommFunction16.
 *
 * Mar 3, 1999. Ove Kåven <ovek@arcticnet.no>
 * - Use port indices instead of unixfds for win16
 * - Moved things around (separated win16 and win32 routines)
 * - Added some hints on how to implement buffers and EnableCommNotification.
 *
 * May 26, 1997.  Fixes and comments by Rick Richardson <rick@dgii.com> [RER]
 * - ptr->fd wasn't getting cleared on close.
 * - GetCommEventMask() and GetCommError() didn't do much of anything.
 *   IMHO, they are still wrong, but they at least implement the RXCHAR
 *   event and return I/O queue sizes, which makes the app I'm interested
 *   in (analog devices EZKIT DSP development system) work.
 *
 * August 12, 1997.  Take a bash at SetCommEventMask - Lawson Whitney
 *                                     <lawson_whitney@juno.com>
 * July 6, 1998. Fixes and comments by Valentijn Sessink
 *                                     <vsessink@ic.uva.nl> [V]
 * Oktober 98, Rein Klazes [RHK]
 * A program that wants to monitor the modem status line (RLSD/DCD) may
 * poll the modem status register in the commMask structure. I update the bit
 * in GetCommError, waiting for an implementation of communication events.
 *
 */

#include "config.h"
#include "wine/port.h"

#include <stdlib.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>

#include "windef.h"
#include "winbase.h"
#include "wine/winuser16.h"
#include "win.h"
#include "user_private.h"

#include "wine/debug.h"

WINE_DEFAULT_DEBUG_CHANNEL(comm);

/* window's semi documented modem status register */
#define COMM_MSR_OFFSET  35
#define MSR_CTS  0x10
#define MSR_DSR  0x20
#define MSR_RI   0x40
#define MSR_RLSD 0x80
#define MSR_MASK (MSR_CTS|MSR_DSR|MSR_RI|MSR_RLSD)

#define FLAG_LPT 0x80

#define MAX_PORTS   9

struct DosDeviceStruct {
    HANDLE handle;
    int suspended;
    int unget,xmit;
    int evtchar;
    /* events */
    int commerror, eventmask;
    /* buffers */
    char *inbuf,*outbuf;
    unsigned ibuf_size,ibuf_head,ibuf_tail;
    unsigned obuf_size,obuf_head,obuf_tail;
    /* notifications */
    HWND wnd;
    int n_read, n_write;
    OVERLAPPED read_ov, write_ov;
    /* save terminal states */
    DCB16 dcb;
    /* pointer to unknown(==undocumented) comm structure */
    SEGPTR seg_unknown;
    BYTE unknown[40];
};

static struct DosDeviceStruct COM[MAX_PORTS];
static struct DosDeviceStruct LPT[MAX_PORTS];

/* update window's semi documented modem status register */
/* see knowledge base Q101417 */
static void COMM_MSRUpdate( HANDLE handle, UCHAR * pMsr )
{
    UCHAR tmpmsr=0;
    DWORD mstat=0;

    if(!GetCommModemStatus(handle,&mstat))
        return;

    if(mstat & MS_CTS_ON) tmpmsr |= MSR_CTS;
    if(mstat & MS_DSR_ON) tmpmsr |= MSR_DSR;
    if(mstat & MS_RING_ON) tmpmsr |= MSR_RI;
    if(mstat & MS_RLSD_ON) tmpmsr |= MSR_RLSD;
    *pMsr = (*pMsr & ~MSR_MASK) | tmpmsr;
}

static struct DosDeviceStruct *GetDeviceStruct(int index)
{
      if ((index&0x7F)<=MAX_PORTS) {
            if (!(index&FLAG_LPT)) {
            if (COM[index].handle)
                return &COM[index];
          } else {
            index &= 0x7f;
            if (LPT[index].handle)
                return &LPT[index];
          }
      }

      return NULL;
}

static int    GetCommPort_ov(const OVERLAPPED *ov, int write)
{
      int x;

      for (x=0; x<MAX_PORTS; x++) {
            if (ov == (write?&COM[x].write_ov:&COM[x].read_ov))
                  return x;
      }

      return -1;
}

static int WinError(void)
{
        TRACE("errno = %d\n", errno);
      switch (errno) {
            default:
                  return CE_IOE;
            }
}

static unsigned comm_inbuf(const struct DosDeviceStruct *ptr)
{
  return ((ptr->ibuf_tail > ptr->ibuf_head) ? ptr->ibuf_size : 0)
    + ptr->ibuf_head - ptr->ibuf_tail;
}

static unsigned comm_outbuf(const struct DosDeviceStruct *ptr)
{
  return ((ptr->obuf_tail > ptr->obuf_head) ? ptr->obuf_size : 0)
    + ptr->obuf_head - ptr->obuf_tail;
}

static void comm_waitread(struct DosDeviceStruct *ptr);
static void comm_waitwrite(struct DosDeviceStruct *ptr);

static VOID WINAPI COMM16_ReadComplete(DWORD dwErrorCode, DWORD len, LPOVERLAPPED ov)
{
      int prev;
      WORD mask = 0;
      int cid = GetCommPort_ov(ov,0);
      struct DosDeviceStruct *ptr;

      if(cid<0) {
            ERR("async write with bad overlapped pointer\n");
            return;
      }
      ptr = &COM[cid];

      /* we get cancelled when CloseComm is called */
      if (dwErrorCode==ERROR_OPERATION_ABORTED)
      {
            TRACE("Cancelled\n");
            return;
      }

      /* read data from comm port */
      if (dwErrorCode != NO_ERROR) {
            ERR("async read failed, error %d\n",dwErrorCode);
            COM[cid].commerror = CE_RXOVER;
            return;
      }
      TRACE("async read completed %d bytes\n",len);

      prev = comm_inbuf(ptr);

      /* check for events */
      if ((ptr->eventmask & EV_RXFLAG) &&
          memchr(ptr->inbuf + ptr->ibuf_head, ptr->evtchar, len)) {
            *(WORD*)(COM[cid].unknown) |= EV_RXFLAG;
            mask |= CN_EVENT;
      }
      if (ptr->eventmask & EV_RXCHAR) {
            *(WORD*)(COM[cid].unknown) |= EV_RXCHAR;
            mask |= CN_EVENT;
      }

      /* advance buffer position */
      ptr->ibuf_head += len;
      if (ptr->ibuf_head >= ptr->ibuf_size)
            ptr->ibuf_head = 0;

      /* check for notification */
      if (ptr->wnd && (ptr->n_read>0) && (prev<ptr->n_read) &&
          (comm_inbuf(ptr)>=ptr->n_read)) {
            /* passed the receive notification threshold */
            mask |= CN_RECEIVE;
      }

      /* send notifications, if any */
      if (ptr->wnd && mask) {
            TRACE("notifying %p: cid=%d, mask=%02x\n", ptr->wnd, cid, mask);
            PostMessageA(ptr->wnd, WM_COMMNOTIFY, cid, mask);
      }

      /* on real windows, this could cause problems, since it is recursive */
      /* restart the receive */
      comm_waitread(ptr);
}

/* this is meant to work like write() */
static INT COMM16_WriteFile(HANDLE hComm, LPCVOID buffer, DWORD len)
{
      OVERLAPPED ov;
      DWORD count= -1;

      ZeroMemory(&ov,sizeof(ov));
      ov.hEvent = CreateEventW(NULL,0,0,NULL);
      if(ov.hEvent==INVALID_HANDLE_VALUE)
            return -1;

      if(!WriteFile(hComm,buffer,len,&count,&ov))
      {
            if(GetLastError()==ERROR_IO_PENDING)
            {
                  GetOverlappedResult(hComm,&ov,&count,TRUE);
            }
      }
      CloseHandle(ov.hEvent);

      return count;
}

static VOID WINAPI COMM16_WriteComplete(DWORD dwErrorCode, DWORD len, LPOVERLAPPED ov)
{
      int prev, bleft;
      WORD mask = 0;
      int cid = GetCommPort_ov(ov,1);
      struct DosDeviceStruct *ptr;

      if(cid<0) {
            ERR("async write with bad overlapped pointer\n");
            return;
      }
      ptr = &COM[cid];

      /* read data from comm port */
      if (dwErrorCode != NO_ERROR) {
            ERR("async write failed, error %d\n",dwErrorCode);
            COM[cid].commerror = CE_RXOVER;
            return;
      }
      TRACE("async write completed %d bytes\n",len);

      /* update the buffer pointers */
      prev = comm_outbuf(&COM[cid]);
      ptr->obuf_tail += len;
      if (ptr->obuf_tail >= ptr->obuf_size)
            ptr->obuf_tail = 0;

      /* write any TransmitCommChar character */
      if (ptr->xmit>=0) {
            len = COMM16_WriteFile(ptr->handle, &(ptr->xmit), 1);
            if (len > 0) ptr->xmit = -1;
      }

      /* write from output queue */
      bleft = ((ptr->obuf_tail <= ptr->obuf_head) ?
            ptr->obuf_head : ptr->obuf_size) - ptr->obuf_tail;

      /* check for notification */
      if (ptr->wnd && (ptr->n_write>0) && (prev>=ptr->n_write) &&
        (comm_outbuf(ptr)<ptr->n_write)) {
            /* passed the transmit notification threshold */
            mask |= CN_TRANSMIT;
      }

      /* send notifications, if any */
      if (ptr->wnd && mask) {
            TRACE("notifying %p: cid=%d, mask=%02x\n", ptr->wnd, cid, mask);
            PostMessageA(ptr->wnd, WM_COMMNOTIFY, cid, mask);
      }

      /* start again if necessary */
      if(bleft)
            comm_waitwrite(ptr);
}

static void comm_waitread(struct DosDeviceStruct *ptr)
{
      unsigned int bleft;
      COMSTAT stat;

      /* FIXME: get timeouts working properly so we can read bleft bytes */
      bleft = ((ptr->ibuf_tail > ptr->ibuf_head) ?
            (ptr->ibuf_tail-1) : ptr->ibuf_size) - ptr->ibuf_head;

      /* find out how many bytes are left in the buffer */
      if(ClearCommError(ptr->handle,NULL,&stat))
            bleft = (bleft<stat.cbInQue) ? bleft : stat.cbInQue;
      else
            bleft = 1;

      /* always read at least one byte */
      if(bleft==0)
            bleft++;

      ReadFileEx(ptr->handle,
            ptr->inbuf + ptr->ibuf_head,
            bleft,
            &ptr->read_ov,
            COMM16_ReadComplete);
}

static void comm_waitwrite(struct DosDeviceStruct *ptr)
{
      int bleft;

      bleft = ((ptr->obuf_tail <= ptr->obuf_head) ?
            ptr->obuf_head : ptr->obuf_size) - ptr->obuf_tail;
      WriteFileEx(ptr->handle,
            ptr->outbuf + ptr->obuf_tail,
            bleft,
            &ptr->write_ov,
            COMM16_WriteComplete);
}

/*****************************************************************************
 *    COMM16_DCBtoDCB16 (Internal)
 */
static INT16 COMM16_DCBtoDCB16(const DCB *lpdcb, LPDCB16 lpdcb16)
{
      if(lpdcb->BaudRate<0x10000)
            lpdcb16->BaudRate = lpdcb->BaudRate;
      else if(lpdcb->BaudRate==115200)
                  lpdcb16->BaudRate = 57601;
      else {
            WARN("Baud rate can't be converted\n");
            lpdcb16->BaudRate = 57601;
      }
      lpdcb16->ByteSize = lpdcb->ByteSize;
      lpdcb16->fParity = lpdcb->fParity;
      lpdcb16->Parity = lpdcb->Parity;
      lpdcb16->StopBits = lpdcb->StopBits;

      lpdcb16->RlsTimeout = 50;
      lpdcb16->CtsTimeout = 50;
      lpdcb16->DsrTimeout = 50;
      lpdcb16->fNull = 0;
      lpdcb16->fChEvt = 0;
      lpdcb16->fBinary = 1;

      lpdcb16->fDtrflow = (lpdcb->fDtrControl==DTR_CONTROL_HANDSHAKE);
      lpdcb16->fRtsflow = (lpdcb->fRtsControl==RTS_CONTROL_HANDSHAKE);
      lpdcb16->fOutxCtsFlow = lpdcb->fOutxCtsFlow;
      lpdcb16->fOutxDsrFlow = lpdcb->fOutxDsrFlow;
      lpdcb16->fDtrDisable = (lpdcb->fDtrControl==DTR_CONTROL_DISABLE);

      lpdcb16->fInX = lpdcb->fInX;

      lpdcb16->fOutX = lpdcb->fOutX;
/*
      lpdcb16->XonChar =
      lpdcb16->XoffChar =
 */
      lpdcb16->XonLim = 10;
      lpdcb16->XoffLim = 10;

      return 0;
}


/**************************************************************************
 *         BuildCommDCB       (USER.213)
 *
 * According to the ECMA-234 (368.3) the function will return FALSE on
 * success, otherwise it will return -1.
 */
INT16 WINAPI BuildCommDCB16(LPCSTR device, LPDCB16 lpdcb)
{
      /* "COM1:96,n,8,1"      */
      /*  012345        */
      int port;
      DCB dcb;

      TRACE("(%s), ptr %p\n", device, lpdcb);

      if (strncasecmp(device,"COM",3))
            return -1;
      port = device[3] - '0';

      if (port-- == 0) {
            ERR("BUG ! COM0 can't exist!\n");
            return -1;
      }

      memset(lpdcb, 0, sizeof(DCB16)); /* initialize */

      lpdcb->Id = port;
      dcb.DCBlength = sizeof(DCB);

      if (strchr(device,'=')) /* block new style */
            return -1;

      if(!BuildCommDCBA(device,&dcb))
            return -1;

      return COMM16_DCBtoDCB16(&dcb, lpdcb);
}

/*****************************************************************************
 *    OpenComm          (USER.200)
 */
INT16 WINAPI OpenComm16(LPCSTR device,UINT16 cbInQueue,UINT16 cbOutQueue)
{
      int port;
      HANDLE handle;

      TRACE("%s, %d, %d\n", device, cbInQueue, cbOutQueue);

      if (strlen(device) < 4)
         return IE_BADID;

      port = device[3] - '0';

      if (port-- == 0)
            ERR("BUG ! COM0 or LPT0 don't exist !\n");

      if (!strncasecmp(device,"COM",3))
        {
            if (COM[port].handle)
                  return IE_OPEN;

            handle = CreateFileA(device, GENERIC_READ|GENERIC_WRITE,
                  FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, CREATE_ALWAYS,
                  FILE_FLAG_OVERLAPPED|FILE_FLAG_NO_BUFFERING, 0 );
            if (handle == INVALID_HANDLE_VALUE) {
                  return IE_HARDWARE;
            } else {
                  memset(COM[port].unknown, 0, sizeof(COM[port].unknown));
                        COM[port].seg_unknown = 0;
                  COM[port].handle = handle;
                  COM[port].commerror = 0;
                  COM[port].eventmask = 0;
                  COM[port].evtchar = 0; /* FIXME: default? */
                        /* save terminal state */
                  GetCommState16(port,&COM[port].dcb);
                  /* init priority characters */
                  COM[port].unget = -1;
                  COM[port].xmit = -1;
                  /* allocate buffers */
                  COM[port].ibuf_size = cbInQueue;
                  COM[port].ibuf_head = COM[port].ibuf_tail = 0;
                  COM[port].obuf_size = cbOutQueue;
                  COM[port].obuf_head = COM[port].obuf_tail = 0;

                  COM[port].inbuf = HeapAlloc(GetProcessHeap(), 0, cbInQueue);
                  if (COM[port].inbuf) {
                    COM[port].outbuf = HeapAlloc( GetProcessHeap(), 0, cbOutQueue);
                    if (!COM[port].outbuf)
                      HeapFree( GetProcessHeap(), 0, COM[port].inbuf);
                  } else COM[port].outbuf = NULL;
                  if (!COM[port].outbuf) {
                    /* not enough memory */
                    CloseHandle(COM[port].handle);
                    ERR("out of memory\n");
                    return IE_MEMORY;
                  }

                  ZeroMemory(&COM[port].read_ov,sizeof (OVERLAPPED));
                  ZeroMemory(&COM[port].write_ov,sizeof (OVERLAPPED));

                        comm_waitread( &COM[port] );
                  USER16_AlertableWait++;

                  return port;
            }
      }
      else
      if (!strncasecmp(device,"LPT",3)) {

            if (LPT[port].handle)
                  return IE_OPEN;

            handle = CreateFileA(device, GENERIC_READ|GENERIC_WRITE,
                  FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, CREATE_ALWAYS, 0, 0 );
            if (handle == INVALID_HANDLE_VALUE) {
                  return IE_HARDWARE;
            } else {
                  LPT[port].handle = handle;
                  LPT[port].commerror = 0;
                  LPT[port].eventmask = 0;
                  return port|FLAG_LPT;
            }
      }
      return IE_BADID;
}

/*****************************************************************************
 *    CloseComm         (USER.207)
 */
INT16 WINAPI CloseComm16(INT16 cid)
{
      struct DosDeviceStruct *ptr;

      TRACE("cid=%d\n", cid);
      if ((ptr = GetDeviceStruct(cid)) == NULL) {
            FIXME("no cid=%d found!\n", cid);
            return -1;
      }
      if (!(cid&FLAG_LPT)) {
            /* COM port */
                UnMapLS( COM[cid].seg_unknown );
            USER16_AlertableWait--;
            CancelIo(ptr->handle);

            /* free buffers */
            HeapFree( GetProcessHeap(), 0, ptr->outbuf);
            HeapFree( GetProcessHeap(), 0, ptr->inbuf);

            /* reset modem lines */
            SetCommState16(&COM[cid].dcb);
      }

      if (!CloseHandle(ptr->handle)) {
            ptr->commerror = WinError();
            /* FIXME: should we clear ptr->handle here? */
            return -1;
      } else {
            ptr->commerror = 0;
            ptr->handle = 0;
            return 0;
      }
}

/*****************************************************************************
 *    SetCommBreak            (USER.210)
 */
INT16 WINAPI SetCommBreak16(INT16 cid)
{
      struct DosDeviceStruct *ptr;

      TRACE("cid=%d\n", cid);
      if ((ptr = GetDeviceStruct(cid)) == NULL) {
            FIXME("no cid=%d found!\n", cid);
            return -1;
      }

      ptr->suspended = 1;
      ptr->commerror = 0;
      return 0;
}

/*****************************************************************************
 *    ClearCommBreak    (USER.211)
 */
INT16 WINAPI ClearCommBreak16(INT16 cid)
{
      struct DosDeviceStruct *ptr;

      TRACE("cid=%d\n", cid);
      if (!(ptr = GetDeviceStruct(cid))) {
            FIXME("no cid=%d found!\n", cid);
            return -1;
      }
      ptr->suspended = 0;
      ptr->commerror = 0;
      return 0;
}

/*****************************************************************************
 *    EscapeCommFunction      (USER.214)
 */
LONG WINAPI EscapeCommFunction16(UINT16 cid,UINT16 nFunction)
{
      struct  DosDeviceStruct *ptr;

      TRACE("cid=%d, function=%d\n", cid, nFunction);

      switch(nFunction) {
      case GETMAXCOM:
              TRACE("GETMAXCOM\n");
                return 4;  /* FIXME */

      case GETMAXLPT:
            TRACE("GETMAXLPT\n");
                return FLAG_LPT + 3;  /* FIXME */

      case GETBASEIRQ:
            TRACE("GETBASEIRQ\n");
            /* FIXME: use tables */
            /* just fake something for now */
            if (cid & FLAG_LPT) {
                  /* LPT1: irq 7, LPT2: irq 5 */
                  return (cid & 0x7f) ? 5 : 7;
            } else {
                  /* COM1: irq 4, COM2: irq 3,
                     COM3: irq 4, COM4: irq 3 */
                  return 4 - (cid & 1);
            }
      }

      if ((ptr = GetDeviceStruct(cid)) == NULL) {
            FIXME("no cid=%d found!\n", cid);
            return -1;
      }

      switch (nFunction) {
      case RESETDEV:
      case CLRDTR:
      case CLRRTS:
      case SETDTR:
      case SETRTS:
      case SETXOFF:
      case SETXON:
            if(EscapeCommFunction(ptr->handle,nFunction))
                  return 0;
            else {
                  ptr->commerror = WinError();
                  return -1;
            }

      case CLRBREAK:
      case SETBREAK:
      default:
            WARN("(cid=%d,nFunction=%d): Unknown function\n",
                  cid, nFunction);
      }
      return -1;
}

/*****************************************************************************
 *    FlushComm   (USER.215)
 */
INT16 WINAPI FlushComm16(INT16 cid,INT16 fnQueue)
{
      DWORD queue;
      struct DosDeviceStruct *ptr;

      TRACE("cid=%d, queue=%d\n", cid, fnQueue);
      if ((ptr = GetDeviceStruct(cid)) == NULL) {
            FIXME("no cid=%d found!\n", cid);
            return -1;
      }
      switch (fnQueue) {
      case 0:
            queue = PURGE_TXABORT;
            ptr->obuf_tail = ptr->obuf_head;
            break;
      case 1:
            queue = PURGE_RXABORT;
            ptr->ibuf_head = ptr->ibuf_tail;
            break;
      default:
            WARN("(cid=%d,fnQueue=%d):Unknown queue\n",
                        cid, fnQueue);
            return -1;
      }

      if (!PurgeComm(ptr->handle,queue)) {
            ptr->commerror = WinError();
            return -1;
      } else {
            ptr->commerror = 0;
            return 0;
      }
}

/********************************************************************
 *    GetCommError      (USER.203)
 */
INT16 WINAPI GetCommError16(INT16 cid,LPCOMSTAT16 lpStat)
{
      int         temperror;
      struct DosDeviceStruct *ptr;
        unsigned char *stol;

      if ((ptr = GetDeviceStruct(cid)) == NULL) {
            FIXME("no handle for cid = %0x!\n",cid);
            return -1;
      }
        if (cid&FLAG_LPT) {
            WARN(" cid %d not comm port\n",cid);
            return CE_MODE;
        }
        stol = (unsigned char *)COM[cid].unknown + COMM_MSR_OFFSET;
      COMM_MSRUpdate( ptr->handle, stol );

       if (lpStat) {
               lpStat->status = 0;

               if (comm_inbuf(ptr) == 0)
                       SleepEx(1,TRUE);

            lpStat->cbOutQue = comm_outbuf(ptr);
            lpStat->cbInQue = comm_inbuf(ptr);

            TRACE("cid %d, error %d, stat %d in %d out %d, stol %x\n",
                       cid, ptr->commerror, lpStat->status, lpStat->cbInQue,
                       lpStat->cbOutQue, *stol);
      }
      else
            TRACE("cid %d, error %d, lpStat NULL stol %x\n",
                       cid, ptr->commerror, *stol);

      /* Return any errors and clear it */
      temperror = ptr->commerror;
      ptr->commerror = 0;
      return(temperror);
}

/*****************************************************************************
 *    SetCommEventMask  (USER.208)
 */
SEGPTR WINAPI SetCommEventMask16(INT16 cid,UINT16 fuEvtMask)
{
      struct DosDeviceStruct *ptr;
        unsigned char *stol;

      TRACE("cid %d,mask %d\n",cid,fuEvtMask);
      if ((ptr = GetDeviceStruct(cid)) == NULL) {
            FIXME("no handle for cid = %0x!\n",cid);
            return 0;
      }

      ptr->eventmask = fuEvtMask;

        if (cid&FLAG_LPT) {
            WARN(" cid %d not comm port\n",cid);
            return 0;
        }
        /* it's a COM port ? -> modify flags */
        stol = (unsigned char *)COM[cid].unknown + COMM_MSR_OFFSET;
      COMM_MSRUpdate( ptr->handle, stol );

      TRACE(" modem dcd construct %x\n",*stol);
        if (!COM[cid].seg_unknown) COM[cid].seg_unknown = MapLS( COM[cid].unknown );
        return COM[cid].seg_unknown;
}

/*****************************************************************************
 *    GetCommEventMask  (USER.209)
 */
UINT16 WINAPI GetCommEventMask16(INT16 cid,UINT16 fnEvtClear)
{
      struct DosDeviceStruct *ptr;
      WORD events;

      TRACE("cid %d, mask %d\n", cid, fnEvtClear);
      if ((ptr = GetDeviceStruct(cid)) == NULL) {
            FIXME("no handle for cid = %0x!\n",cid);
          return 0;
      }

        if (cid&FLAG_LPT) {
            WARN(" cid %d not comm port\n",cid);
            return 0;
        }

      events = *(WORD*)(COM[cid].unknown) & fnEvtClear;
      *(WORD*)(COM[cid].unknown) &= ~fnEvtClear;
      return events;
}

/*****************************************************************************
 *    SetCommState      (USER.201)
 */
INT16 WINAPI SetCommState16(LPDCB16 lpdcb)
{
      struct DosDeviceStruct *ptr;
      DCB dcb;

      TRACE("cid %d, ptr %p\n", lpdcb->Id, lpdcb);
      if ((ptr = GetDeviceStruct(lpdcb->Id)) == NULL) {
            FIXME("no handle for cid = %0x!\n",lpdcb->Id);
            return -1;
      }

      memset(&dcb,0,sizeof(dcb));
      dcb.DCBlength = sizeof(dcb);

      /*
       * according to MSDN, we should first interpret lpdcb->BaudRate as follows:
       * 1. if the baud rate is a CBR constant, interpret it.
       * 2. if it is greater than 57600, the baud rate is 115200
       * 3. use the actual baudrate
       * steps 2 and 3 are equivalent to 16550 baudrate divisor = 115200/BaudRate
       */
      switch(lpdcb->BaudRate)
      {
      case CBR_110:    dcb.BaudRate = 110;    break;
      case CBR_300:    dcb.BaudRate = 300;    break;
      case CBR_600:    dcb.BaudRate = 600;    break;
      case CBR_1200:   dcb.BaudRate = 1200;   break;
      case CBR_2400:   dcb.BaudRate = 2400;   break;
      case CBR_4800:   dcb.BaudRate = 4800;   break;
      case CBR_9600:   dcb.BaudRate = 9600;   break;
      case CBR_14400:  dcb.BaudRate = 14400;  break;
      case CBR_19200:  dcb.BaudRate = 19200;  break;
      case CBR_38400:  dcb.BaudRate = 38400;  break;
      case CBR_56000:  dcb.BaudRate = 56000;  break;
      case CBR_128000: dcb.BaudRate = 128000; break;
      case CBR_256000: dcb.BaudRate = 256000; break;
      default:
            if(lpdcb->BaudRate>57600)
            dcb.BaudRate = 115200;
        else
            dcb.BaudRate = lpdcb->BaudRate;
      }

        dcb.ByteSize=lpdcb->ByteSize;
        dcb.StopBits=lpdcb->StopBits;

      dcb.fParity=lpdcb->fParity;
      dcb.Parity=lpdcb->Parity;

      dcb.fOutxCtsFlow = lpdcb->fOutxCtsFlow;

      if (lpdcb->fDtrflow || lpdcb->fRtsflow)
            dcb.fRtsControl = TRUE;

      if (lpdcb->fDtrDisable)
            dcb.fDtrControl = TRUE;

      ptr->evtchar = lpdcb->EvtChar;

      dcb.fInX = lpdcb->fInX;
      dcb.fOutX = lpdcb->fOutX;

      if (!SetCommState(ptr->handle,&dcb)) {
            ptr->commerror = WinError();
            return -1;
      } else {
            ptr->commerror = 0;
            return 0;
      }
}

/*****************************************************************************
 *    GetCommState      (USER.202)
 */
INT16 WINAPI GetCommState16(INT16 cid, LPDCB16 lpdcb)
{
      struct DosDeviceStruct *ptr;
      DCB dcb;

      TRACE("cid %d, ptr %p\n", cid, lpdcb);
      if ((ptr = GetDeviceStruct(cid)) == NULL) {
            FIXME("no handle for cid = %0x!\n",cid);
            return -1;
      }
      if (!GetCommState(ptr->handle,&dcb)) {
            ptr->commerror = WinError();
            return -1;
      }

      lpdcb->Id = cid;

      COMM16_DCBtoDCB16(&dcb,lpdcb);

      lpdcb->EvtChar = ptr->evtchar;

      ptr->commerror = 0;
      return 0;
}

/*****************************************************************************
 *    TransmitCommChar  (USER.206)
 */
INT16 WINAPI TransmitCommChar16(INT16 cid,CHAR chTransmit)
{
      struct DosDeviceStruct *ptr;

      TRACE("cid %d, data %d\n", cid, chTransmit);
      if ((ptr = GetDeviceStruct(cid)) == NULL) {
            FIXME("no handle for cid = %0x!\n",cid);
            return -1;
      }

      if (ptr->suspended) {
            ptr->commerror = IE_HARDWARE;
            return -1;
      }

      if (ptr->xmit >= 0) {
        /* character already queued */
        /* FIXME: which error would Windows return? */
        ptr->commerror = CE_TXFULL;
        return -1;
      }

      if (ptr->obuf_head == ptr->obuf_tail) {
        /* transmit queue empty, try to transmit directly */
        if(1!=COMM16_WriteFile(ptr->handle, &chTransmit, 1))
        {
          /* didn't work, queue it */
          ptr->xmit = chTransmit;
          comm_waitwrite(ptr);
        }
      } else {
        /* data in queue, let this char be transmitted next */
        ptr->xmit = chTransmit;
        comm_waitwrite(ptr);
      }

      ptr->commerror = 0;
      return 0;
}

/*****************************************************************************
 *    UngetCommChar     (USER.212)
 */
INT16 WINAPI UngetCommChar16(INT16 cid,CHAR chUnget)
{
      struct DosDeviceStruct *ptr;

      TRACE("cid %d (char %d)\n", cid, chUnget);
      if ((ptr = GetDeviceStruct(cid)) == NULL) {
            FIXME("no handle for cid = %0x!\n",cid);
            return -1;
      }

      if (ptr->suspended) {
            ptr->commerror = IE_HARDWARE;
            return -1;
      }

      if (ptr->unget>=0) {
        /* character already queued */
        /* FIXME: which error would Windows return? */
        ptr->commerror = CE_RXOVER;
        return -1;
      }

      ptr->unget = chUnget;

      ptr->commerror = 0;
      return 0;
}

/*****************************************************************************
 *    ReadComm    (USER.204)
 */
INT16 WINAPI ReadComm16(INT16 cid,LPSTR lpvBuf,INT16 cbRead)
{
      int status, length;
      struct DosDeviceStruct *ptr;
      LPSTR orgBuf = lpvBuf;

      TRACE("cid %d, ptr %p, length %d\n", cid, lpvBuf, cbRead);
      if ((ptr = GetDeviceStruct(cid)) == NULL) {
            FIXME("no handle for cid = %0x!\n",cid);
            return -1;
      }

      if (ptr->suspended) {
            ptr->commerror = IE_HARDWARE;
            return -1;
      }

      if(0==comm_inbuf(ptr))
            SleepEx(1,TRUE);

      /* read unget character */
      if (ptr->unget>=0) {
            *lpvBuf++ = ptr->unget;
            ptr->unget = -1;

            length = 1;
      } else
            length = 0;

      /* read from receive buffer */
      while (length < cbRead) {
        status = ((ptr->ibuf_head < ptr->ibuf_tail) ?
                ptr->ibuf_size : ptr->ibuf_head) - ptr->ibuf_tail;
        if (!status) break;
        if ((cbRead - length) < status)
          status = cbRead - length;

        memcpy(lpvBuf, ptr->inbuf + ptr->ibuf_tail, status);
        ptr->ibuf_tail += status;
        if (ptr->ibuf_tail >= ptr->ibuf_size)
          ptr->ibuf_tail = 0;
        lpvBuf += status;
        length += status;
      }

      TRACE("%s\n", debugstr_an( orgBuf, length ));
      ptr->commerror = 0;
      return length;
}

/*****************************************************************************
 *    WriteComm   (USER.205)
 */
INT16 WINAPI WriteComm16(INT16 cid, LPSTR lpvBuf, INT16 cbWrite)
{
      int status, length;
      struct DosDeviceStruct *ptr;

      TRACE("cid %d, ptr %p, length %d\n",
            cid, lpvBuf, cbWrite);
      if ((ptr = GetDeviceStruct(cid)) == NULL) {
            FIXME("no handle for cid = %0x!\n",cid);
            return -1;
      }

      if (ptr->suspended) {
            ptr->commerror = IE_HARDWARE;
            return -1;
      }

      TRACE("%s\n", debugstr_an( lpvBuf, cbWrite ));

      length = 0;
      while (length < cbWrite) {
        if ((ptr->obuf_head == ptr->obuf_tail) && (ptr->xmit < 0)) {
          /* no data queued, try to write directly */
          status = COMM16_WriteFile(ptr->handle, lpvBuf, cbWrite - length);
          if (status > 0) {
            lpvBuf += status;
            length += status;
            continue;
          }
        }
        /* can't write directly, put into transmit buffer */
        status = ((ptr->obuf_tail > ptr->obuf_head) ?
                (ptr->obuf_tail-1) : ptr->obuf_size) - ptr->obuf_head;
        if (!status) break;
        if ((cbWrite - length) < status)
          status = cbWrite - length;
        memcpy(lpvBuf, ptr->outbuf + ptr->obuf_head, status);
        ptr->obuf_head += status;
        if (ptr->obuf_head >= ptr->obuf_size)
          ptr->obuf_head = 0;
        lpvBuf += status;
        length += status;
        comm_waitwrite(ptr);
      }

      ptr->commerror = 0;
      return length;
}

/***********************************************************************
 *           EnableCommNotification   (USER.245)
 */
BOOL16 WINAPI EnableCommNotification16( INT16 cid, HWND16 hwnd,
                                      INT16 cbWriteNotify, INT16 cbOutQueue )
{
      struct DosDeviceStruct *ptr;

      TRACE("(%d, %x, %d, %d)\n", cid, hwnd, cbWriteNotify, cbOutQueue);
      if ((ptr = GetDeviceStruct(cid)) == NULL) {
            FIXME("no handle for cid = %0x!\n",cid);
            return -1;
      }
      ptr->wnd = WIN_Handle32( hwnd );
      ptr->n_read = cbWriteNotify;
      ptr->n_write = cbOutQueue;
      return TRUE;
}

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