git.oblomov.eu Git - wine/blob - dlls/user32/comm16.c

   1 /*
   2  * DEC 93 Erik Bos <erik@xs4all.nl>
   3  *
   4  * Copyright 1996 Marcus Meissner
   5  *
   6  * Copyright 2001 Mike McCormack
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  21  *
  22  * History:
  23  *
  24  * Mar 31, 1999. Ove Kåven <ovek@arcticnet.no>
  25  * - Implemented buffers and EnableCommNotification.
  26  *
  27  * Apr 3, 1999.  Lawson Whitney <lawson_whitney@juno.com>
  28  * - Fixed the modem control part of EscapeCommFunction16.
  29  *
  30  * Mar 3, 1999. Ove Kåven <ovek@arcticnet.no>
  31  * - Use port indices instead of unixfds for win16
  32  * - Moved things around (separated win16 and win32 routines)
  33  * - Added some hints on how to implement buffers and EnableCommNotification.
  34  *
  35  * May 26, 1997.  Fixes and comments by Rick Richardson <rick@dgii.com> [RER]
  36  * - ptr->fd wasn't getting cleared on close.
  37  * - GetCommEventMask() and GetCommError() didn't do much of anything.
  38  *   IMHO, they are still wrong, but they at least implement the RXCHAR
  39  *   event and return I/O queue sizes, which makes the app I'm interested
  40  *   in (analog devices EZKIT DSP development system) work.
  41  *
  42  * August 12, 1997.  Take a bash at SetCommEventMask - Lawson Whitney
  43  *                                     <lawson_whitney@juno.com>
  44  * July 6, 1998. Fixes and comments by Valentijn Sessink
  45  *                                     <vsessink@ic.uva.nl> [V]
  46  * Oktober 98, Rein Klazes [RHK]
  47  * A program that wants to monitor the modem status line (RLSD/DCD) may
  48  * poll the modem status register in the commMask structure. I update the bit
  49  * in GetCommError, waiting for an implementation of communication events.
  50  *
  51  */
  52
  53 #include "config.h"
  54 #include "wine/port.h"
  55
  56 #include <stdlib.h>
  57 #include <stdarg.h>
  58 #include <stdio.h>
  59 #include <string.h>
  60 #include <errno.h>
  61 #include <ctype.h>
  62
  63 #include "windef.h"
  64 #include "winbase.h"
  65 #include "wine/winuser16.h"
  66 #include "win.h"
  67 #include "user_private.h"
  68
  69 #include "wine/debug.h"
  70
  71 WINE_DEFAULT_DEBUG_CHANNEL(comm);
  72
  73 /* window's semi documented modem status register */
  74 #define COMM_MSR_OFFSET  35
  75 #define MSR_CTS  0x10
  76 #define MSR_DSR  0x20
  77 #define MSR_RI   0x40
  78 #define MSR_RLSD 0x80
  79 #define MSR_MASK (MSR_CTS|MSR_DSR|MSR_RI|MSR_RLSD)
  80
  81 #define FLAG_LPT 0x80
  82
  83 #define MAX_PORTS   9
  84
  85 struct DosDeviceStruct {
  86     HANDLE handle;
  87     int suspended;
  88     int unget,xmit;
  89     int evtchar;
  90     /* events */
  91     int commerror, eventmask;
  92     /* buffers */
  93     char *inbuf,*outbuf;
  94     unsigned ibuf_size,ibuf_head,ibuf_tail;
  95     unsigned obuf_size,obuf_head,obuf_tail;
  96     /* notifications */
  97     HWND wnd;
  98     int n_read, n_write;
  99     OVERLAPPED read_ov, write_ov;
 100     /* save terminal states */
 101     DCB16 dcb;
 102     /* pointer to unknown(==undocumented) comm structure */
 103     SEGPTR seg_unknown;
 104     BYTE unknown[40];
 105 };
 106
 107 static struct DosDeviceStruct COM[MAX_PORTS];
 108 static struct DosDeviceStruct LPT[MAX_PORTS];
 109
 110 /* update window's semi documented modem status register */
 111 /* see knowledge base Q101417 */
 112 static void COMM_MSRUpdate( HANDLE handle, UCHAR * pMsr )
 113 {
 114     UCHAR tmpmsr=0;
 115     DWORD mstat=0;
 116
 117     if(!GetCommModemStatus(handle,&mstat))
 118         return;
 119
 120     if(mstat & MS_CTS_ON) tmpmsr |= MSR_CTS;
 121     if(mstat & MS_DSR_ON) tmpmsr |= MSR_DSR;
 122     if(mstat & MS_RING_ON) tmpmsr |= MSR_RI;
 123     if(mstat & MS_RLSD_ON) tmpmsr |= MSR_RLSD;
 124     *pMsr = (*pMsr & ~MSR_MASK) | tmpmsr;
 125 }
 126
 127 static struct DosDeviceStruct *GetDeviceStruct(int index)
 128 {
 129         if ((index&0x7F)<=MAX_PORTS) {
 130             if (!(index&FLAG_LPT)) {
 131                 if (COM[index].handle)
 132                     return &COM[index];
 133             } else {
 134                 index &= 0x7f;
 135                 if (LPT[index].handle)
 136                     return &LPT[index];
 137             }
 138         }
 139
 140         return NULL;
 141 }
 142
 143 static int    GetCommPort_ov(const OVERLAPPED *ov, int write)
 144 {
 145         int x;
 146
 147         for (x=0; x<MAX_PORTS; x++) {
 148                 if (ov == (write?&COM[x].write_ov:&COM[x].read_ov))
 149                         return x;
 150         }
 151
 152         return -1;
 153 }
 154
 155 static int WinError(void)
 156 {
 157         TRACE("errno = %d\n", errno);
 158         switch (errno) {
 159                 default:
 160                         return CE_IOE;
 161                 }
 162 }
 163
 164 static unsigned comm_inbuf(const struct DosDeviceStruct *ptr)
 165 {
 166   return ((ptr->ibuf_tail > ptr->ibuf_head) ? ptr->ibuf_size : 0)
 167     + ptr->ibuf_head - ptr->ibuf_tail;
 168 }
 169
 170 static unsigned comm_outbuf(const struct DosDeviceStruct *ptr)
 171 {
 172   return ((ptr->obuf_tail > ptr->obuf_head) ? ptr->obuf_size : 0)
 173     + ptr->obuf_head - ptr->obuf_tail;
 174 }
 175
 176 static void comm_waitread(struct DosDeviceStruct *ptr);
 177 static void comm_waitwrite(struct DosDeviceStruct *ptr);
 178
 179 static VOID WINAPI COMM16_ReadComplete(DWORD dwErrorCode, DWORD len, LPOVERLAPPED ov)
 180 {
 181         int prev;
 182         WORD mask = 0;
 183         int cid = GetCommPort_ov(ov,0);
 184         struct DosDeviceStruct *ptr;
 185
 186         if(cid<0) {
 187                 ERR("async write with bad overlapped pointer\n");
 188                 return;
 189         }
 190         ptr = &COM[cid];
 191
 192         /* we get cancelled when CloseComm is called */
 193         if (dwErrorCode==ERROR_OPERATION_ABORTED)
 194         {
 195                 TRACE("Cancelled\n");
 196                 return;
 197         }
 198
 199         /* read data from comm port */
 200         if (dwErrorCode != NO_ERROR) {
 201                 ERR("async read failed, error %d\n",dwErrorCode);
 202                 COM[cid].commerror = CE_RXOVER;
 203                 return;
 204         }
 205         TRACE("async read completed %d bytes\n",len);
 206
 207         prev = comm_inbuf(ptr);
 208
 209         /* check for events */
 210         if ((ptr->eventmask & EV_RXFLAG) &&
 211             memchr(ptr->inbuf + ptr->ibuf_head, ptr->evtchar, len)) {
 212                 *(WORD*)(COM[cid].unknown) |= EV_RXFLAG;
 213                 mask |= CN_EVENT;
 214         }
 215         if (ptr->eventmask & EV_RXCHAR) {
 216                 *(WORD*)(COM[cid].unknown) |= EV_RXCHAR;
 217                 mask |= CN_EVENT;
 218         }
 219
 220         /* advance buffer position */
 221         ptr->ibuf_head += len;
 222         if (ptr->ibuf_head >= ptr->ibuf_size)
 223                 ptr->ibuf_head = 0;
 224
 225         /* check for notification */
 226         if (ptr->wnd && (ptr->n_read>0) && (prev<ptr->n_read) &&
 227             (comm_inbuf(ptr)>=ptr->n_read)) {
 228                 /* passed the receive notification threshold */
 229                 mask |= CN_RECEIVE;
 230         }
 231
 232         /* send notifications, if any */
 233         if (ptr->wnd && mask) {
 234                 TRACE("notifying %p: cid=%d, mask=%02x\n", ptr->wnd, cid, mask);
 235                 PostMessageA(ptr->wnd, WM_COMMNOTIFY, cid, mask);
 236         }
 237
 238         /* on real windows, this could cause problems, since it is recursive */
 239         /* restart the receive */
 240         comm_waitread(ptr);
 241 }
 242
 243 /* this is meant to work like write() */
 244 static INT COMM16_WriteFile(HANDLE hComm, LPCVOID buffer, DWORD len)
 245 {
 246         OVERLAPPED ov;
 247         DWORD count= -1;
 248
 249         ZeroMemory(&ov,sizeof(ov));
 250         ov.hEvent = CreateEventW(NULL,0,0,NULL);
 251         if(ov.hEvent==INVALID_HANDLE_VALUE)
 252                 return -1;
 253
 254         if(!WriteFile(hComm,buffer,len,&count,&ov))
 255         {
 256                 if(GetLastError()==ERROR_IO_PENDING)
 257                 {
 258                         GetOverlappedResult(hComm,&ov,&count,TRUE);
 259                 }
 260         }
 261         CloseHandle(ov.hEvent);
 262
 263         return count;
 264 }
 265
 266 static VOID WINAPI COMM16_WriteComplete(DWORD dwErrorCode, DWORD len, LPOVERLAPPED ov)
 267 {
 268         int prev, bleft;
 269         WORD mask = 0;
 270         int cid = GetCommPort_ov(ov,1);
 271         struct DosDeviceStruct *ptr;
 272
 273         if(cid<0) {
 274                 ERR("async write with bad overlapped pointer\n");
 275                 return;
 276         }
 277         ptr = &COM[cid];
 278
 279         /* read data from comm port */
 280         if (dwErrorCode != NO_ERROR) {
 281                 ERR("async write failed, error %d\n",dwErrorCode);
 282                 COM[cid].commerror = CE_RXOVER;
 283                 return;
 284         }
 285         TRACE("async write completed %d bytes\n",len);
 286
 287         /* update the buffer pointers */
 288         prev = comm_outbuf(&COM[cid]);
 289         ptr->obuf_tail += len;
 290         if (ptr->obuf_tail >= ptr->obuf_size)
 291                 ptr->obuf_tail = 0;
 292
 293         /* write any TransmitCommChar character */
 294         if (ptr->xmit>=0) {
 295                 len = COMM16_WriteFile(ptr->handle, &(ptr->xmit), 1);
 296                 if (len > 0) ptr->xmit = -1;
 297         }
 298
 299         /* write from output queue */
 300         bleft = ((ptr->obuf_tail <= ptr->obuf_head) ?
 301                 ptr->obuf_head : ptr->obuf_size) - ptr->obuf_tail;
 302
 303         /* check for notification */
 304         if (ptr->wnd && (ptr->n_write>0) && (prev>=ptr->n_write) &&
 305           (comm_outbuf(ptr)<ptr->n_write)) {
 306                 /* passed the transmit notification threshold */
 307                 mask |= CN_TRANSMIT;
 308         }
 309
 310         /* send notifications, if any */
 311         if (ptr->wnd && mask) {
 312                 TRACE("notifying %p: cid=%d, mask=%02x\n", ptr->wnd, cid, mask);
 313                 PostMessageA(ptr->wnd, WM_COMMNOTIFY, cid, mask);
 314         }
 315
 316         /* start again if necessary */
 317         if(bleft)
 318                 comm_waitwrite(ptr);
 319 }
 320
 321 static void comm_waitread(struct DosDeviceStruct *ptr)
 322 {
 323         unsigned int bleft;
 324         COMSTAT stat;
 325
 326         /* FIXME: get timeouts working properly so we can read bleft bytes */
 327         bleft = ((ptr->ibuf_tail > ptr->ibuf_head) ?
 328                 (ptr->ibuf_tail-1) : ptr->ibuf_size) - ptr->ibuf_head;
 329
 330         /* find out how many bytes are left in the buffer */
 331         if(ClearCommError(ptr->handle,NULL,&stat))
 332                 bleft = (bleft<stat.cbInQue) ? bleft : stat.cbInQue;
 333         else
 334                 bleft = 1;
 335
 336         /* always read at least one byte */
 337         if(bleft==0)
 338                 bleft++;
 339
 340         ReadFileEx(ptr->handle,
 341                 ptr->inbuf + ptr->ibuf_head,
 342                 bleft,
 343                 &ptr->read_ov,
 344                 COMM16_ReadComplete);
 345 }
 346
 347 static void comm_waitwrite(struct DosDeviceStruct *ptr)
 348 {
 349         int bleft;
 350
 351         bleft = ((ptr->obuf_tail <= ptr->obuf_head) ?
 352                 ptr->obuf_head : ptr->obuf_size) - ptr->obuf_tail;
 353         WriteFileEx(ptr->handle,
 354                 ptr->outbuf + ptr->obuf_tail,
 355                 bleft,
 356                 &ptr->write_ov,
 357                 COMM16_WriteComplete);
 358 }
 359
 360 /*****************************************************************************
 361  *      COMM16_DCBtoDCB16       (Internal)
 362  */
 363 static INT16 COMM16_DCBtoDCB16(const DCB *lpdcb, LPDCB16 lpdcb16)
 364 {
 365         if(lpdcb->BaudRate<0x10000)
 366                 lpdcb16->BaudRate = lpdcb->BaudRate;
 367         else if(lpdcb->BaudRate==115200)
 368                         lpdcb16->BaudRate = 57601;
 369         else {
 370                 WARN("Baud rate can't be converted\n");
 371                 lpdcb16->BaudRate = 57601;
 372         }
 373         lpdcb16->ByteSize = lpdcb->ByteSize;
 374         lpdcb16->fParity = lpdcb->fParity;
 375         lpdcb16->Parity = lpdcb->Parity;
 376         lpdcb16->StopBits = lpdcb->StopBits;
 377
 378         lpdcb16->RlsTimeout = 50;
 379         lpdcb16->CtsTimeout = 50;
 380         lpdcb16->DsrTimeout = 50;
 381         lpdcb16->fNull = 0;
 382         lpdcb16->fChEvt = 0;
 383         lpdcb16->fBinary = 1;
 384
 385         lpdcb16->fDtrflow = (lpdcb->fDtrControl==DTR_CONTROL_HANDSHAKE);
 386         lpdcb16->fRtsflow = (lpdcb->fRtsControl==RTS_CONTROL_HANDSHAKE);
 387         lpdcb16->fOutxCtsFlow = lpdcb->fOutxCtsFlow;
 388         lpdcb16->fOutxDsrFlow = lpdcb->fOutxDsrFlow;
 389         lpdcb16->fDtrDisable = (lpdcb->fDtrControl==DTR_CONTROL_DISABLE);
 390
 391         lpdcb16->fInX = lpdcb->fInX;
 392
 393         lpdcb16->fOutX = lpdcb->fOutX;
 394 /*
 395         lpdcb16->XonChar =
 396         lpdcb16->XoffChar =
 397  */
 398         lpdcb16->XonLim = 10;
 399         lpdcb16->XoffLim = 10;
 400
 401         return 0;
 402 }
 403
 404
 405 /**************************************************************************
 406  *         BuildCommDCB         (USER.213)
 407  *
 408  * According to the ECMA-234 (368.3) the function will return FALSE on
 409  * success, otherwise it will return -1.
 410  */
 411 INT16 WINAPI BuildCommDCB16(LPCSTR device, LPDCB16 lpdcb)
 412 {
 413         /* "COM1:96,n,8,1"      */
 414         /*  012345              */
 415         int port;
 416         DCB dcb;
 417
 418         TRACE("(%s), ptr %p\n", device, lpdcb);
 419
 420         if (strncasecmp(device,"COM",3))
 421                 return -1;
 422         port = device[3] - '0';
 423
 424         if (port-- == 0) {
 425                 ERR("BUG ! COM0 can't exist!\n");
 426                 return -1;
 427         }
 428
 429         memset(lpdcb, 0, sizeof(DCB16)); /* initialize */
 430
 431         lpdcb->Id = port;
 432         dcb.DCBlength = sizeof(DCB);
 433
 434         if (strchr(device,'=')) /* block new style */
 435                 return -1;
 436
 437         if(!BuildCommDCBA(device,&dcb))
 438                 return -1;
 439
 440         return COMM16_DCBtoDCB16(&dcb, lpdcb);
 441 }
 442
 443 /*****************************************************************************
 444  *      OpenComm                (USER.200)
 445  */
 446 INT16 WINAPI OpenComm16(LPCSTR device,UINT16 cbInQueue,UINT16 cbOutQueue)
 447 {
 448         int port;
 449         HANDLE handle;
 450
 451         TRACE("%s, %d, %d\n", device, cbInQueue, cbOutQueue);
 452
 453         if (strlen(device) < 4)
 454            return IE_BADID;
 455
 456         port = device[3] - '0';
 457
 458         if (port-- == 0)
 459                 ERR("BUG ! COM0 or LPT0 don't exist !\n");
 460
 461         if (!strncasecmp(device,"COM",3))
 462         {
 463                 if (COM[port].handle)
 464                         return IE_OPEN;
 465
 466                 handle = CreateFileA(device, GENERIC_READ|GENERIC_WRITE,
 467                         FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, CREATE_ALWAYS,
 468                         FILE_FLAG_OVERLAPPED|FILE_FLAG_NO_BUFFERING, 0 );
 469                 if (handle == INVALID_HANDLE_VALUE) {
 470                         return IE_HARDWARE;
 471                 } else {
 472                         memset(COM[port].unknown, 0, sizeof(COM[port].unknown));
 473                         COM[port].seg_unknown = 0;
 474                         COM[port].handle = handle;
 475                         COM[port].commerror = 0;
 476                         COM[port].eventmask = 0;
 477                         COM[port].evtchar = 0; /* FIXME: default? */
 478                         /* save terminal state */
 479                         GetCommState16(port,&COM[port].dcb);
 480                         /* init priority characters */
 481                         COM[port].unget = -1;
 482                         COM[port].xmit = -1;
 483                         /* allocate buffers */
 484                         COM[port].ibuf_size = cbInQueue;
 485                         COM[port].ibuf_head = COM[port].ibuf_tail = 0;
 486                         COM[port].obuf_size = cbOutQueue;
 487                         COM[port].obuf_head = COM[port].obuf_tail = 0;
 488
 489                         COM[port].inbuf = HeapAlloc(GetProcessHeap(), 0, cbInQueue);
 490                         if (COM[port].inbuf) {
 491                           COM[port].outbuf = HeapAlloc( GetProcessHeap(), 0, cbOutQueue);
 492                           if (!COM[port].outbuf)
 493                             HeapFree( GetProcessHeap(), 0, COM[port].inbuf);
 494                         } else COM[port].outbuf = NULL;
 495                         if (!COM[port].outbuf) {
 496                           /* not enough memory */
 497                           CloseHandle(COM[port].handle);
 498                           ERR("out of memory\n");
 499                           return IE_MEMORY;
 500                         }
 501
 502                         ZeroMemory(&COM[port].read_ov,sizeof (OVERLAPPED));
 503                         ZeroMemory(&COM[port].write_ov,sizeof (OVERLAPPED));
 504
 505                         comm_waitread( &COM[port] );
 506                         USER16_AlertableWait++;
 507
 508                         return port;
 509                 }
 510         }
 511         else
 512         if (!strncasecmp(device,"LPT",3)) {
 513
 514                 if (LPT[port].handle)
 515                         return IE_OPEN;
 516
 517                 handle = CreateFileA(device, GENERIC_READ|GENERIC_WRITE,
 518                         FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, CREATE_ALWAYS, 0, 0 );
 519                 if (handle == INVALID_HANDLE_VALUE) {
 520                         return IE_HARDWARE;
 521                 } else {
 522                         LPT[port].handle = handle;
 523                         LPT[port].commerror = 0;
 524                         LPT[port].eventmask = 0;
 525                         return port|FLAG_LPT;
 526                 }
 527         }
 528         return IE_BADID;
 529 }
 530
 531 /*****************************************************************************
 532  *      CloseComm               (USER.207)
 533  */
 534 INT16 WINAPI CloseComm16(INT16 cid)
 535 {
 536         struct DosDeviceStruct *ptr;
 537
 538         TRACE("cid=%d\n", cid);
 539         if ((ptr = GetDeviceStruct(cid)) == NULL) {
 540                 FIXME("no cid=%d found!\n", cid);
 541                 return -1;
 542         }
 543         if (!(cid&FLAG_LPT)) {
 544                 /* COM port */
 545                 UnMapLS( COM[cid].seg_unknown );
 546                 USER16_AlertableWait--;
 547                 CancelIo(ptr->handle);
 548
 549                 /* free buffers */
 550                 HeapFree( GetProcessHeap(), 0, ptr->outbuf);
 551                 HeapFree( GetProcessHeap(), 0, ptr->inbuf);
 552
 553                 /* reset modem lines */
 554                 SetCommState16(&COM[cid].dcb);
 555         }
 556
 557         if (!CloseHandle(ptr->handle)) {
 558                 ptr->commerror = WinError();
 559                 /* FIXME: should we clear ptr->handle here? */
 560                 return -1;
 561         } else {
 562                 ptr->commerror = 0;
 563                 ptr->handle = 0;
 564                 return 0;
 565         }
 566 }
 567
 568 /*****************************************************************************
 569  *      SetCommBreak            (USER.210)
 570  */
 571 INT16 WINAPI SetCommBreak16(INT16 cid)
 572 {
 573         struct DosDeviceStruct *ptr;
 574
 575         TRACE("cid=%d\n", cid);
 576         if ((ptr = GetDeviceStruct(cid)) == NULL) {
 577                 FIXME("no cid=%d found!\n", cid);
 578                 return -1;
 579         }
 580
 581         ptr->suspended = 1;
 582         ptr->commerror = 0;
 583         return 0;
 584 }
 585
 586 /*****************************************************************************
 587  *      ClearCommBreak  (USER.211)
 588  */
 589 INT16 WINAPI ClearCommBreak16(INT16 cid)
 590 {
 591         struct DosDeviceStruct *ptr;
 592
 593         TRACE("cid=%d\n", cid);
 594         if (!(ptr = GetDeviceStruct(cid))) {
 595                 FIXME("no cid=%d found!\n", cid);
 596                 return -1;
 597         }
 598         ptr->suspended = 0;
 599         ptr->commerror = 0;
 600         return 0;
 601 }
 602
 603 /*****************************************************************************
 604  *      EscapeCommFunction      (USER.214)
 605  */
 606 LONG WINAPI EscapeCommFunction16(UINT16 cid,UINT16 nFunction)
 607 {
 608         struct  DosDeviceStruct *ptr;
 609
 610         TRACE("cid=%d, function=%d\n", cid, nFunction);
 611
 612         switch(nFunction) {
 613         case GETMAXCOM:
 614                 TRACE("GETMAXCOM\n");
 615                 return 4;  /* FIXME */
 616
 617         case GETMAXLPT:
 618                 TRACE("GETMAXLPT\n");
 619                 return FLAG_LPT + 3;  /* FIXME */
 620
 621         case GETBASEIRQ:
 622                 TRACE("GETBASEIRQ\n");
 623                 /* FIXME: use tables */
 624                 /* just fake something for now */
 625                 if (cid & FLAG_LPT) {
 626                         /* LPT1: irq 7, LPT2: irq 5 */
 627                         return (cid & 0x7f) ? 5 : 7;
 628                 } else {
 629                         /* COM1: irq 4, COM2: irq 3,
 630                            COM3: irq 4, COM4: irq 3 */
 631                         return 4 - (cid & 1);
 632                 }
 633         }
 634
 635         if ((ptr = GetDeviceStruct(cid)) == NULL) {
 636                 FIXME("no cid=%d found!\n", cid);
 637                 return -1;
 638         }
 639
 640         switch (nFunction) {
 641         case RESETDEV:
 642         case CLRDTR:
 643         case CLRRTS:
 644         case SETDTR:
 645         case SETRTS:
 646         case SETXOFF:
 647         case SETXON:
 648                 if(EscapeCommFunction(ptr->handle,nFunction))
 649                         return 0;
 650                 else {
 651                         ptr->commerror = WinError();
 652                         return -1;
 653                 }
 654
 655         case CLRBREAK:
 656         case SETBREAK:
 657         default:
 658                 WARN("(cid=%d,nFunction=%d): Unknown function\n",
 659                         cid, nFunction);
 660         }
 661         return -1;
 662 }
 663
 664 /*****************************************************************************
 665  *      FlushComm       (USER.215)
 666  */
 667 INT16 WINAPI FlushComm16(INT16 cid,INT16 fnQueue)
 668 {
 669         DWORD queue;
 670         struct DosDeviceStruct *ptr;
 671
 672         TRACE("cid=%d, queue=%d\n", cid, fnQueue);
 673         if ((ptr = GetDeviceStruct(cid)) == NULL) {
 674                 FIXME("no cid=%d found!\n", cid);
 675                 return -1;
 676         }
 677         switch (fnQueue) {
 678         case 0:
 679                 queue = PURGE_TXABORT;
 680                 ptr->obuf_tail = ptr->obuf_head;
 681                 break;
 682         case 1:
 683                 queue = PURGE_RXABORT;
 684                 ptr->ibuf_head = ptr->ibuf_tail;
 685                 break;
 686         default:
 687                 WARN("(cid=%d,fnQueue=%d):Unknown queue\n",
 688                             cid, fnQueue);
 689                 return -1;
 690         }
 691
 692         if (!PurgeComm(ptr->handle,queue)) {
 693                 ptr->commerror = WinError();
 694                 return -1;
 695         } else {
 696                 ptr->commerror = 0;
 697                 return 0;
 698         }
 699 }
 700
 701 /********************************************************************
 702  *      GetCommError    (USER.203)
 703  */
 704 INT16 WINAPI GetCommError16(INT16 cid,LPCOMSTAT16 lpStat)
 705 {
 706         int             temperror;
 707         struct DosDeviceStruct *ptr;
 708         unsigned char *stol;
 709
 710         if ((ptr = GetDeviceStruct(cid)) == NULL) {
 711                 FIXME("no handle for cid = %0x!\n",cid);
 712                 return -1;
 713         }
 714         if (cid&FLAG_LPT) {
 715             WARN(" cid %d not comm port\n",cid);
 716             return CE_MODE;
 717         }
 718         stol = (unsigned char *)COM[cid].unknown + COMM_MSR_OFFSET;
 719         COMM_MSRUpdate( ptr->handle, stol );
 720
 721        if (lpStat) {
 722                lpStat->status = 0;
 723
 724                if (comm_inbuf(ptr) == 0)
 725                        SleepEx(1,TRUE);
 726
 727                 lpStat->cbOutQue = comm_outbuf(ptr);
 728                 lpStat->cbInQue = comm_inbuf(ptr);
 729
 730                 TRACE("cid %d, error %d, stat %d in %d out %d, stol %x\n",
 731                              cid, ptr->commerror, lpStat->status, lpStat->cbInQue,
 732                              lpStat->cbOutQue, *stol);
 733         }
 734         else
 735                 TRACE("cid %d, error %d, lpStat NULL stol %x\n",
 736                              cid, ptr->commerror, *stol);
 737
 738         /* Return any errors and clear it */
 739         temperror = ptr->commerror;
 740         ptr->commerror = 0;
 741         return(temperror);
 742 }
 743
 744 /*****************************************************************************
 745  *      SetCommEventMask        (USER.208)
 746  */
 747 SEGPTR WINAPI SetCommEventMask16(INT16 cid,UINT16 fuEvtMask)
 748 {
 749         struct DosDeviceStruct *ptr;
 750         unsigned char *stol;
 751
 752         TRACE("cid %d,mask %d\n",cid,fuEvtMask);
 753         if ((ptr = GetDeviceStruct(cid)) == NULL) {
 754                 FIXME("no handle for cid = %0x!\n",cid);
 755             return (SEGPTR)NULL;
 756         }
 757
 758         ptr->eventmask = fuEvtMask;
 759
 760         if (cid&FLAG_LPT) {
 761             WARN(" cid %d not comm port\n",cid);
 762             return (SEGPTR)NULL;
 763         }
 764         /* it's a COM port ? -> modify flags */
 765         stol = (unsigned char *)COM[cid].unknown + COMM_MSR_OFFSET;
 766         COMM_MSRUpdate( ptr->handle, stol );
 767
 768         TRACE(" modem dcd construct %x\n",*stol);
 769         if (!COM[cid].seg_unknown) COM[cid].seg_unknown = MapLS( COM[cid].unknown );
 770         return COM[cid].seg_unknown;
 771 }
 772
 773 /*****************************************************************************
 774  *      GetCommEventMask        (USER.209)
 775  */
 776 UINT16 WINAPI GetCommEventMask16(INT16 cid,UINT16 fnEvtClear)
 777 {
 778         struct DosDeviceStruct *ptr;
 779         WORD events;
 780
 781         TRACE("cid %d, mask %d\n", cid, fnEvtClear);
 782         if ((ptr = GetDeviceStruct(cid)) == NULL) {
 783                 FIXME("no handle for cid = %0x!\n",cid);
 784             return 0;
 785         }
 786
 787         if (cid&FLAG_LPT) {
 788             WARN(" cid %d not comm port\n",cid);
 789             return 0;
 790         }
 791
 792         events = *(WORD*)(COM[cid].unknown) & fnEvtClear;
 793         *(WORD*)(COM[cid].unknown) &= ~fnEvtClear;
 794         return events;
 795 }
 796
 797 /*****************************************************************************
 798  *      SetCommState    (USER.201)
 799  */
 800 INT16 WINAPI SetCommState16(LPDCB16 lpdcb)
 801 {
 802         struct DosDeviceStruct *ptr;
 803         DCB dcb;
 804
 805         TRACE("cid %d, ptr %p\n", lpdcb->Id, lpdcb);
 806         if ((ptr = GetDeviceStruct(lpdcb->Id)) == NULL) {
 807                 FIXME("no handle for cid = %0x!\n",lpdcb->Id);
 808                 return -1;
 809         }
 810
 811         memset(&dcb,0,sizeof(dcb));
 812         dcb.DCBlength = sizeof(dcb);
 813
 814         /*
 815          * according to MSDN, we should first interpret lpdcb->BaudRate as follows:
 816          * 1. if the baud rate is a CBR constant, interpret it.
 817          * 2. if it is greater than 57600, the baud rate is 115200
 818          * 3. use the actual baudrate
 819          * steps 2 and 3 are equivalent to 16550 baudrate divisor = 115200/BaudRate
 820          * see http://support.microsoft.com/support/kb/articles/q108/9/28.asp
 821          */
 822         switch(lpdcb->BaudRate)
 823         {
 824         case CBR_110:    dcb.BaudRate = 110;    break;
 825         case CBR_300:    dcb.BaudRate = 300;    break;
 826         case CBR_600:    dcb.BaudRate = 600;    break;
 827         case CBR_1200:   dcb.BaudRate = 1200;   break;
 828         case CBR_2400:   dcb.BaudRate = 2400;   break;
 829         case CBR_4800:   dcb.BaudRate = 4800;   break;
 830         case CBR_9600:   dcb.BaudRate = 9600;   break;
 831         case CBR_14400:  dcb.BaudRate = 14400;  break;
 832         case CBR_19200:  dcb.BaudRate = 19200;  break;
 833         case CBR_38400:  dcb.BaudRate = 38400;  break;
 834         case CBR_56000:  dcb.BaudRate = 56000;  break;
 835         case CBR_128000: dcb.BaudRate = 128000; break;
 836         case CBR_256000: dcb.BaudRate = 256000; break;
 837         default:
 838                 if(lpdcb->BaudRate>57600)
 839                 dcb.BaudRate = 115200;
 840         else
 841                 dcb.BaudRate = lpdcb->BaudRate;
 842         }
 843
 844         dcb.ByteSize=lpdcb->ByteSize;
 845         dcb.StopBits=lpdcb->StopBits;
 846
 847         dcb.fParity=lpdcb->fParity;
 848         dcb.Parity=lpdcb->Parity;
 849
 850         dcb.fOutxCtsFlow = lpdcb->fOutxCtsFlow;
 851
 852         if (lpdcb->fDtrflow || lpdcb->fRtsflow)
 853                 dcb.fRtsControl = TRUE;
 854
 855         if (lpdcb->fDtrDisable)
 856                 dcb.fDtrControl = TRUE;
 857
 858         ptr->evtchar = lpdcb->EvtChar;
 859
 860         dcb.fInX = lpdcb->fInX;
 861         dcb.fOutX = lpdcb->fOutX;
 862
 863         if (!SetCommState(ptr->handle,&dcb)) {
 864                 ptr->commerror = WinError();
 865                 return -1;
 866         } else {
 867                 ptr->commerror = 0;
 868                 return 0;
 869         }
 870 }
 871
 872 /*****************************************************************************
 873  *      GetCommState    (USER.202)
 874  */
 875 INT16 WINAPI GetCommState16(INT16 cid, LPDCB16 lpdcb)
 876 {
 877         struct DosDeviceStruct *ptr;
 878         DCB dcb;
 879
 880         TRACE("cid %d, ptr %p\n", cid, lpdcb);
 881         if ((ptr = GetDeviceStruct(cid)) == NULL) {
 882                 FIXME("no handle for cid = %0x!\n",cid);
 883                 return -1;
 884         }
 885         if (!GetCommState(ptr->handle,&dcb)) {
 886                 ptr->commerror = WinError();
 887                 return -1;
 888         }
 889
 890         lpdcb->Id = cid;
 891
 892         COMM16_DCBtoDCB16(&dcb,lpdcb);
 893
 894         lpdcb->EvtChar = ptr->evtchar;
 895
 896         ptr->commerror = 0;
 897         return 0;
 898 }
 899
 900 /*****************************************************************************
 901  *      TransmitCommChar        (USER.206)
 902  */
 903 INT16 WINAPI TransmitCommChar16(INT16 cid,CHAR chTransmit)
 904 {
 905         struct DosDeviceStruct *ptr;
 906
 907         TRACE("cid %d, data %d\n", cid, chTransmit);
 908         if ((ptr = GetDeviceStruct(cid)) == NULL) {
 909                 FIXME("no handle for cid = %0x!\n",cid);
 910                 return -1;
 911         }
 912
 913         if (ptr->suspended) {
 914                 ptr->commerror = IE_HARDWARE;
 915                 return -1;
 916         }
 917
 918         if (ptr->xmit >= 0) {
 919           /* character already queued */
 920           /* FIXME: which error would Windows return? */
 921           ptr->commerror = CE_TXFULL;
 922           return -1;
 923         }
 924
 925         if (ptr->obuf_head == ptr->obuf_tail) {
 926           /* transmit queue empty, try to transmit directly */
 927           if(1!=COMM16_WriteFile(ptr->handle, &chTransmit, 1))
 928           {
 929             /* didn't work, queue it */
 930             ptr->xmit = chTransmit;
 931             comm_waitwrite(ptr);
 932           }
 933         } else {
 934           /* data in queue, let this char be transmitted next */
 935           ptr->xmit = chTransmit;
 936           comm_waitwrite(ptr);
 937         }
 938
 939         ptr->commerror = 0;
 940         return 0;
 941 }
 942
 943 /*****************************************************************************
 944  *      UngetCommChar   (USER.212)
 945  */
 946 INT16 WINAPI UngetCommChar16(INT16 cid,CHAR chUnget)
 947 {
 948         struct DosDeviceStruct *ptr;
 949
 950         TRACE("cid %d (char %d)\n", cid, chUnget);
 951         if ((ptr = GetDeviceStruct(cid)) == NULL) {
 952                 FIXME("no handle for cid = %0x!\n",cid);
 953                 return -1;
 954         }
 955
 956         if (ptr->suspended) {
 957                 ptr->commerror = IE_HARDWARE;
 958                 return -1;
 959         }
 960
 961         if (ptr->unget>=0) {
 962           /* character already queued */
 963           /* FIXME: which error would Windows return? */
 964           ptr->commerror = CE_RXOVER;
 965           return -1;
 966         }
 967
 968         ptr->unget = chUnget;
 969
 970         ptr->commerror = 0;
 971         return 0;
 972 }
 973
 974 /*****************************************************************************
 975  *      ReadComm        (USER.204)
 976  */
 977 INT16 WINAPI ReadComm16(INT16 cid,LPSTR lpvBuf,INT16 cbRead)
 978 {
 979         int status, length;
 980         struct DosDeviceStruct *ptr;
 981         LPSTR orgBuf = lpvBuf;
 982
 983         TRACE("cid %d, ptr %p, length %d\n", cid, lpvBuf, cbRead);
 984         if ((ptr = GetDeviceStruct(cid)) == NULL) {
 985                 FIXME("no handle for cid = %0x!\n",cid);
 986                 return -1;
 987         }
 988
 989         if (ptr->suspended) {
 990                 ptr->commerror = IE_HARDWARE;
 991                 return -1;
 992         }
 993
 994         if(0==comm_inbuf(ptr))
 995                 SleepEx(1,TRUE);
 996
 997         /* read unget character */
 998         if (ptr->unget>=0) {
 999                 *lpvBuf++ = ptr->unget;
1000                 ptr->unget = -1;
1001
1002                 length = 1;
1003         } else
1004                 length = 0;
1005
1006         /* read from receive buffer */
1007         while (length < cbRead) {
1008           status = ((ptr->ibuf_head < ptr->ibuf_tail) ?
1009                     ptr->ibuf_size : ptr->ibuf_head) - ptr->ibuf_tail;
1010           if (!status) break;
1011           if ((cbRead - length) < status)
1012             status = cbRead - length;
1013
1014           memcpy(lpvBuf, ptr->inbuf + ptr->ibuf_tail, status);
1015           ptr->ibuf_tail += status;
1016           if (ptr->ibuf_tail >= ptr->ibuf_size)
1017             ptr->ibuf_tail = 0;
1018           lpvBuf += status;
1019           length += status;
1020         }
1021
1022         TRACE("%s\n", debugstr_an( orgBuf, length ));
1023         ptr->commerror = 0;
1024         return length;
1025 }
1026
1027 /*****************************************************************************
1028  *      WriteComm       (USER.205)
1029  */
1030 INT16 WINAPI WriteComm16(INT16 cid, LPSTR lpvBuf, INT16 cbWrite)
1031 {
1032         int status, length;
1033         struct DosDeviceStruct *ptr;
1034
1035         TRACE("cid %d, ptr %p, length %d\n",
1036                 cid, lpvBuf, cbWrite);
1037         if ((ptr = GetDeviceStruct(cid)) == NULL) {
1038                 FIXME("no handle for cid = %0x!\n",cid);
1039                 return -1;
1040         }
1041
1042         if (ptr->suspended) {
1043                 ptr->commerror = IE_HARDWARE;
1044                 return -1;
1045         }
1046
1047         TRACE("%s\n", debugstr_an( lpvBuf, cbWrite ));
1048
1049         length = 0;
1050         while (length < cbWrite) {
1051           if ((ptr->obuf_head == ptr->obuf_tail) && (ptr->xmit < 0)) {
1052             /* no data queued, try to write directly */
1053             status = COMM16_WriteFile(ptr->handle, lpvBuf, cbWrite - length);
1054             if (status > 0) {
1055               lpvBuf += status;
1056               length += status;
1057               continue;
1058             }
1059           }
1060           /* can't write directly, put into transmit buffer */
1061           status = ((ptr->obuf_tail > ptr->obuf_head) ?
1062                     (ptr->obuf_tail-1) : ptr->obuf_size) - ptr->obuf_head;
1063           if (!status) break;
1064           if ((cbWrite - length) < status)
1065             status = cbWrite - length;
1066           memcpy(lpvBuf, ptr->outbuf + ptr->obuf_head, status);
1067           ptr->obuf_head += status;
1068           if (ptr->obuf_head >= ptr->obuf_size)
1069             ptr->obuf_head = 0;
1070           lpvBuf += status;
1071           length += status;
1072           comm_waitwrite(ptr);
1073         }
1074
1075         ptr->commerror = 0;
1076         return length;
1077 }
1078
1079 /***********************************************************************
1080  *           EnableCommNotification   (USER.245)
1081  */
1082 BOOL16 WINAPI EnableCommNotification16( INT16 cid, HWND16 hwnd,
1083                                       INT16 cbWriteNotify, INT16 cbOutQueue )
1084 {
1085         struct DosDeviceStruct *ptr;
1086
1087         TRACE("(%d, %x, %d, %d)\n", cid, hwnd, cbWriteNotify, cbOutQueue);
1088         if ((ptr = GetDeviceStruct(cid)) == NULL) {
1089                 FIXME("no handle for cid = %0x!\n",cid);
1090                 return -1;
1091         }
1092         ptr->wnd = WIN_Handle32( hwnd );
1093         ptr->n_read = cbWriteNotify;
1094         ptr->n_write = cbOutQueue;
1095         return TRUE;
1096 }