dlls/user/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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  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
  55 #include <stdlib.h>
  56 #include <stdarg.h>
  57 #include <stdio.h>
  58 #include <string.h>
  59 #include <errno.h>
  60 #include <ctype.h>
  61
  62 #include "ntstatus.h"
  63 #include "windef.h"
  64 #include "winbase.h"
  65 #include "wingdi.h"
  66 #include "winreg.h"
  67 #include "winuser.h"
  68 #include "wine/winuser16.h"
  69 #include "wine/port.h"
  70 #include "win.h"
  71 #include "winerror.h"
  72
  73 #include "wine/debug.h"
  74
  75 WINE_DEFAULT_DEBUG_CHANNEL(comm);
  76
  77 /* window's semi documented modem status register */
  78 #define COMM_MSR_OFFSET  35
  79 #define MSR_CTS  0x10
  80 #define MSR_DSR  0x20
  81 #define MSR_RI   0x40
  82 #define MSR_RLSD 0x80
  83 #define MSR_MASK (MSR_CTS|MSR_DSR|MSR_RI|MSR_RLSD)
  84
  85 #define FLAG_LPT 0x80
  86
  87 #define MAX_PORTS   9
  88
  89 struct DosDeviceStruct {
  90     HANDLE handle;
  91     int suspended;
  92     int unget,xmit;
  93     int evtchar;
  94     /* events */
  95     int commerror, eventmask;
  96     /* buffers */
  97     char *inbuf,*outbuf;
  98     unsigned ibuf_size,ibuf_head,ibuf_tail;
  99     unsigned obuf_size,obuf_head,obuf_tail;
 100     /* notifications */
 101     HWND wnd;
 102     int n_read, n_write;
 103     OVERLAPPED read_ov, write_ov;
 104     /* save terminal states */
 105     DCB16 dcb;
 106     /* pointer to unknown(==undocumented) comm structure */
 107     SEGPTR seg_unknown;
 108     BYTE unknown[40];
 109 };
 110
 111 static struct DosDeviceStruct COM[MAX_PORTS];
 112 static struct DosDeviceStruct LPT[MAX_PORTS];
 113
 114 /* update window's semi documented modem status register */
 115 /* see knowledge base Q101417 */
 116 static void COMM_MSRUpdate( HANDLE handle, UCHAR * pMsr )
 117 {
 118     UCHAR tmpmsr=0;
 119     DWORD mstat=0;
 120
 121     if(!GetCommModemStatus(handle,&mstat))
 122         return;
 123
 124     if(mstat & MS_CTS_ON) tmpmsr |= MSR_CTS;
 125     if(mstat & MS_DSR_ON) tmpmsr |= MSR_DSR;
 126     if(mstat & MS_RING_ON) tmpmsr |= MSR_RI;
 127     if(mstat & MS_RLSD_ON) tmpmsr |= MSR_RLSD;
 128     *pMsr = (*pMsr & ~MSR_MASK) | tmpmsr;
 129 }
 130
 131 static struct DosDeviceStruct *GetDeviceStruct(int index)
 132 {
 133         if ((index&0x7F)<=MAX_PORTS) {
 134             if (!(index&FLAG_LPT)) {
 135                 if (COM[index].handle)
 136                     return &COM[index];
 137             } else {
 138                 index &= 0x7f;
 139                 if (LPT[index].handle)
 140                     return &LPT[index];
 141             }
 142         }
 143
 144         return NULL;
 145 }
 146
 147 static int    GetCommPort_ov(LPOVERLAPPED ov, int write)
 148 {
 149         int x;
 150
 151         for (x=0; x<MAX_PORTS; x++) {
 152                 if (ov == (write?&COM[x].write_ov:&COM[x].read_ov))
 153                         return x;
 154         }
 155
 156         return -1;
 157 }
 158
 159 static int WinError(void)
 160 {
 161         TRACE("errno = %d\n", errno);
 162         switch (errno) {
 163                 default:
 164                         return CE_IOE;
 165                 }
 166 }
 167
 168 static unsigned comm_inbuf(struct DosDeviceStruct *ptr)
 169 {
 170   return ((ptr->ibuf_tail > ptr->ibuf_head) ? ptr->ibuf_size : 0)
 171     + ptr->ibuf_head - ptr->ibuf_tail;
 172 }
 173
 174 static unsigned comm_outbuf(struct DosDeviceStruct *ptr)
 175 {
 176   return ((ptr->obuf_tail > ptr->obuf_head) ? ptr->obuf_size : 0)
 177     + ptr->obuf_head - ptr->obuf_tail;
 178 }
 179
 180 static void comm_waitread(struct DosDeviceStruct *ptr);
 181 static void comm_waitwrite(struct DosDeviceStruct *ptr);
 182
 183 static VOID WINAPI COMM16_ReadComplete(DWORD status, DWORD len, LPOVERLAPPED ov)
 184 {
 185         int prev ;
 186         WORD mask = 0;
 187         int cid = GetCommPort_ov(ov,0);
 188         struct DosDeviceStruct *ptr;
 189
 190         if(cid<0) {
 191                 ERR("async write with bad overlapped pointer\n");
 192                 return;
 193         }
 194         ptr = &COM[cid];
 195
 196         /* we get cancelled when CloseComm is called */
 197         if (status==STATUS_CANCELLED)
 198         {
 199                 TRACE("Cancelled\n");
 200                 return;
 201         }
 202
 203         /* read data from comm port */
 204         if (status != STATUS_SUCCESS) {
 205                 ERR("async read failed %08lx\n",status);
 206                 COM[cid].commerror = CE_RXOVER;
 207                 return;
 208         }
 209         TRACE("async read completed %ld bytes\n",len);
 210
 211         prev = comm_inbuf(ptr);
 212
 213         /* check for events */
 214         if ((ptr->eventmask & EV_RXFLAG) &&
 215             memchr(ptr->inbuf + ptr->ibuf_head, ptr->evtchar, len)) {
 216                 *(WORD*)(COM[cid].unknown) |= EV_RXFLAG;
 217                 mask |= CN_EVENT;
 218         }
 219         if (ptr->eventmask & EV_RXCHAR) {
 220                 *(WORD*)(COM[cid].unknown) |= EV_RXCHAR;
 221                 mask |= CN_EVENT;
 222         }
 223
 224         /* advance buffer position */
 225         ptr->ibuf_head += len;
 226         if (ptr->ibuf_head >= ptr->ibuf_size)
 227                 ptr->ibuf_head = 0;
 228
 229         /* check for notification */
 230         if (ptr->wnd && (ptr->n_read>0) && (prev<ptr->n_read) &&
 231             (comm_inbuf(ptr)>=ptr->n_read)) {
 232                 /* passed the receive notification threshold */
 233                 mask |= CN_RECEIVE;
 234         }
 235
 236         /* send notifications, if any */
 237         if (ptr->wnd && mask) {
 238                 TRACE("notifying %p: cid=%d, mask=%02x\n", ptr->wnd, cid, mask);
 239                 PostMessageA(ptr->wnd, WM_COMMNOTIFY, cid, mask);
 240         }
 241
 242         /* on real windows, this could cause problems, since it is recursive */
 243         /* restart the receive */
 244         comm_waitread(ptr);
 245 }
 246
 247 /* this is meant to work like write() */
 248 static INT COMM16_WriteFile(HANDLE hComm, LPCVOID buffer, DWORD len)
 249 {
 250         OVERLAPPED ov;
 251         DWORD count= -1;
 252
 253         ZeroMemory(&ov,sizeof(ov));
 254         ov.hEvent = CreateEventA(NULL,0,0,NULL);
 255         if(ov.hEvent==INVALID_HANDLE_VALUE)
 256                 return -1;
 257
 258         if(!WriteFile(hComm,buffer,len,&count,&ov))
 259         {
 260                 if(GetLastError()==ERROR_IO_PENDING)
 261                 {
 262                         GetOverlappedResult(hComm,&ov,&count,TRUE);
 263                 }
 264         }
 265         CloseHandle(ov.hEvent);
 266
 267         return count;
 268 }
 269
 270 static VOID WINAPI COMM16_WriteComplete(DWORD status, DWORD len, LPOVERLAPPED ov)
 271 {
 272         int prev, bleft;
 273         WORD mask = 0;
 274         int cid = GetCommPort_ov(ov,1);
 275         struct DosDeviceStruct *ptr;
 276
 277         if(cid<0) {
 278                 ERR("async write with bad overlapped pointer\n");
 279                 return;
 280         }
 281         ptr = &COM[cid];
 282
 283         /* read data from comm port */
 284         if (status != STATUS_SUCCESS) {
 285                 ERR("async write failed\n");
 286                 COM[cid].commerror = CE_RXOVER;
 287                 return;
 288         }
 289         TRACE("async write completed %ld bytes\n",len);
 290
 291         /* update the buffer pointers */
 292         prev = comm_outbuf(&COM[cid]);
 293         ptr->obuf_tail += len;
 294         if (ptr->obuf_tail >= ptr->obuf_size)
 295                 ptr->obuf_tail = 0;
 296
 297         /* write any TransmitCommChar character */
 298         if (ptr->xmit>=0) {
 299                 len = COMM16_WriteFile(ptr->handle, &(ptr->xmit), 1);
 300                 if (len > 0) ptr->xmit = -1;
 301         }
 302
 303         /* write from output queue */
 304         bleft = ((ptr->obuf_tail <= ptr->obuf_head) ?
 305                 ptr->obuf_head : ptr->obuf_size) - ptr->obuf_tail;
 306
 307         /* check for notification */
 308         if (ptr->wnd && (ptr->n_write>0) && (prev>=ptr->n_write) &&
 309           (comm_outbuf(ptr)<ptr->n_write)) {
 310                 /* passed the transmit notification threshold */
 311                 mask |= CN_TRANSMIT;
 312         }
 313
 314         /* send notifications, if any */
 315         if (ptr->wnd && mask) {
 316                 TRACE("notifying %p: cid=%d, mask=%02x\n", ptr->wnd, cid, mask);
 317                 PostMessageA(ptr->wnd, WM_COMMNOTIFY, cid, mask);
 318         }
 319
 320         /* start again if necessary */
 321         if(bleft)
 322                 comm_waitwrite(ptr);
 323 }
 324
 325 static void comm_waitread(struct DosDeviceStruct *ptr)
 326 {
 327         int bleft;
 328         COMSTAT stat;
 329
 330         /* FIXME: get timeouts working properly so we can read bleft bytes */
 331         bleft = ((ptr->ibuf_tail > ptr->ibuf_head) ?
 332                 (ptr->ibuf_tail-1) : ptr->ibuf_size) - ptr->ibuf_head;
 333
 334         /* find out how many bytes are left in the buffer */
 335         if(ClearCommError(ptr->handle,NULL,&stat))
 336                 bleft = (bleft<stat.cbInQue) ? bleft : stat.cbInQue;
 337         else
 338                 bleft = 1;
 339
 340         /* always read at least one byte */
 341         if(bleft==0)
 342                 bleft++;
 343
 344         ReadFileEx(ptr->handle,
 345                 ptr->inbuf + ptr->ibuf_head,
 346                 bleft,
 347                 &ptr->read_ov,
 348                 COMM16_ReadComplete);
 349 }
 350
 351 static void comm_waitwrite(struct DosDeviceStruct *ptr)
 352 {
 353         int bleft;
 354
 355         bleft = ((ptr->obuf_tail <= ptr->obuf_head) ?
 356                 ptr->obuf_head : ptr->obuf_size) - ptr->obuf_tail;
 357         WriteFileEx(ptr->handle,
 358                 ptr->outbuf + ptr->obuf_tail,
 359                 bleft,
 360                 &ptr->write_ov,
 361                 COMM16_WriteComplete);
 362 }
 363
 364 /*****************************************************************************
 365  *      COMM16_DCBtoDCB16       (Internal)
 366  */
 367 INT16 COMM16_DCBtoDCB16(LPDCB lpdcb, LPDCB16 lpdcb16)
 368 {
 369         if(lpdcb->BaudRate<0x10000)
 370                 lpdcb16->BaudRate = lpdcb->BaudRate;
 371         else if(lpdcb->BaudRate==115200)
 372                         lpdcb16->BaudRate = 57601;
 373         else {
 374                 WARN("Baud rate can't be converted\n");
 375                 lpdcb16->BaudRate = 57601;
 376         }
 377         lpdcb16->ByteSize = lpdcb->ByteSize;
 378         lpdcb16->fParity = lpdcb->fParity;
 379         lpdcb16->Parity = lpdcb->Parity;
 380         lpdcb16->StopBits = lpdcb->StopBits;
 381
 382         lpdcb16->RlsTimeout = 50;
 383         lpdcb16->CtsTimeout = 50;
 384         lpdcb16->DsrTimeout = 50;
 385         lpdcb16->fNull = 0;
 386         lpdcb16->fChEvt = 0;
 387         lpdcb16->fBinary = 1;
 388
 389         lpdcb16->fDtrflow = (lpdcb->fDtrControl==DTR_CONTROL_HANDSHAKE);
 390         lpdcb16->fRtsflow = (lpdcb->fRtsControl==RTS_CONTROL_HANDSHAKE);
 391         lpdcb16->fOutxCtsFlow = lpdcb->fOutxCtsFlow;
 392         lpdcb16->fOutxDsrFlow = lpdcb->fOutxDsrFlow;
 393         lpdcb16->fDtrDisable = (lpdcb->fDtrControl==DTR_CONTROL_DISABLE);
 394
 395         lpdcb16->fInX = lpdcb->fInX;
 396
 397         lpdcb16->fOutX = lpdcb->fOutX;
 398 /*
 399         lpdcb16->XonChar =
 400         lpdcb16->XoffChar =
 401  */
 402         lpdcb16->XonLim = 10;
 403         lpdcb16->XoffLim = 10;
 404
 405         return 0;
 406 }
 407
 408
 409 /**************************************************************************
 410  *         BuildCommDCB         (USER.213)
 411  *
 412  * According to the ECMA-234 (368.3) the function will return FALSE on
 413  * success, otherwise it will return -1.
 414  */
 415 INT16 WINAPI BuildCommDCB16(LPCSTR device, LPDCB16 lpdcb)
 416 {
 417         /* "COM1:96,n,8,1"      */
 418         /*  012345              */
 419         int port;
 420         DCB dcb;
 421
 422         TRACE("(%s), ptr %p\n", device, lpdcb);
 423
 424         if (strncasecmp(device,"COM",3))
 425                 return -1;
 426         port = device[3] - '0';
 427
 428         if (port-- == 0) {
 429                 ERR("BUG ! COM0 can't exist!\n");
 430                 return -1;
 431         }
 432
 433         memset(lpdcb, 0, sizeof(DCB16)); /* initialize */
 434
 435         lpdcb->Id = port;
 436         dcb.DCBlength = sizeof(DCB);
 437
 438         if (strchr(device,'=')) /* block new style */
 439                 return -1;
 440
 441         if(!BuildCommDCBA(device,&dcb))
 442                 return -1;
 443
 444         return COMM16_DCBtoDCB16(&dcb, lpdcb);
 445 }
 446
 447 /*****************************************************************************
 448  *      OpenComm                (USER.200)
 449  */
 450 INT16 WINAPI OpenComm16(LPCSTR device,UINT16 cbInQueue,UINT16 cbOutQueue)
 451 {
 452         int port;
 453         HANDLE handle;
 454
 455         TRACE("%s, %d, %d\n", device, cbInQueue, cbOutQueue);
 456
 457         if (strlen(device) < 4)
 458            return IE_BADID;
 459
 460         port = device[3] - '0';
 461
 462         if (port-- == 0)
 463                 ERR("BUG ! COM0 or LPT0 don't exist !\n");
 464
 465         if (!strncasecmp(device,"COM",3))
 466         {
 467                 if (COM[port].handle)
 468                         return IE_OPEN;
 469
 470                 handle = CreateFileA(device, GENERIC_READ|GENERIC_WRITE,
 471                         FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, CREATE_ALWAYS,
 472                         FILE_FLAG_OVERLAPPED|FILE_FLAG_NO_BUFFERING, 0 );
 473                 if (handle == INVALID_HANDLE_VALUE) {
 474                         return IE_HARDWARE;
 475                 } else {
 476                         memset(COM[port].unknown, 0, sizeof(COM[port].unknown));
 477                         COM[port].seg_unknown = 0;
 478                         COM[port].handle = handle;
 479                         COM[port].commerror = 0;
 480                         COM[port].eventmask = 0;
 481                         COM[port].evtchar = 0; /* FIXME: default? */
 482                         /* save terminal state */
 483                         GetCommState16(port,&COM[port].dcb);
 484                         /* init priority characters */
 485                         COM[port].unget = -1;
 486                         COM[port].xmit = -1;
 487                         /* allocate buffers */
 488                         COM[port].ibuf_size = cbInQueue;
 489                         COM[port].ibuf_head = COM[port].ibuf_tail = 0;
 490                         COM[port].obuf_size = cbOutQueue;
 491                         COM[port].obuf_head = COM[port].obuf_tail = 0;
 492
 493                         COM[port].inbuf = malloc(cbInQueue);
 494                         if (COM[port].inbuf) {
 495                           COM[port].outbuf = malloc(cbOutQueue);
 496                           if (!COM[port].outbuf)
 497                             free(COM[port].inbuf);
 498                         } else COM[port].outbuf = NULL;
 499                         if (!COM[port].outbuf) {
 500                           /* not enough memory */
 501                           CloseHandle(COM[port].handle);
 502                           ERR("out of memory\n");
 503                           return IE_MEMORY;
 504                         }
 505
 506                         ZeroMemory(&COM[port].read_ov,sizeof (OVERLAPPED));
 507                         ZeroMemory(&COM[port].write_ov,sizeof (OVERLAPPED));
 508
 509                         comm_waitread( &COM[port] );
 510                         USER16_AlertableWait++;
 511
 512                         return port;
 513                 }
 514         }
 515         else
 516         if (!strncasecmp(device,"LPT",3)) {
 517
 518                 if (LPT[port].handle)
 519                         return IE_OPEN;
 520
 521                 handle = CreateFileA(device, GENERIC_READ|GENERIC_WRITE,
 522                         FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, CREATE_ALWAYS, 0, 0 );
 523                 if (handle == INVALID_HANDLE_VALUE) {
 524                         return IE_HARDWARE;
 525                 } else {
 526                         LPT[port].handle = handle;
 527                         LPT[port].commerror = 0;
 528                         LPT[port].eventmask = 0;
 529                         return port|FLAG_LPT;
 530                 }
 531         }
 532         return IE_BADID;
 533 }
 534
 535 /*****************************************************************************
 536  *      CloseComm               (USER.207)
 537  */
 538 INT16 WINAPI CloseComm16(INT16 cid)
 539 {
 540         struct DosDeviceStruct *ptr;
 541
 542         TRACE("cid=%d\n", cid);
 543         if ((ptr = GetDeviceStruct(cid)) == NULL) {
 544                 FIXME("no cid=%d found!\n", cid);
 545                 return -1;
 546         }
 547         if (!(cid&FLAG_LPT)) {
 548                 /* COM port */
 549                 UnMapLS( COM[cid].seg_unknown );
 550                 USER16_AlertableWait--;
 551                 CancelIo(ptr->handle);
 552
 553                 /* free buffers */
 554                 free(ptr->outbuf);
 555                 free(ptr->inbuf);
 556
 557                 /* reset modem lines */
 558                 SetCommState16(&COM[cid].dcb);
 559         }
 560
 561         if (!CloseHandle(ptr->handle)) {
 562                 ptr->commerror = WinError();
 563                 /* FIXME: should we clear ptr->handle here? */
 564                 return -1;
 565         } else {
 566                 ptr->commerror = 0;
 567                 ptr->handle = 0;
 568                 return 0;
 569         }
 570 }
 571
 572 /*****************************************************************************
 573  *      SetCommBreak            (USER.210)
 574  */
 575 INT16 WINAPI SetCommBreak16(INT16 cid)
 576 {
 577         struct DosDeviceStruct *ptr;
 578
 579         TRACE("cid=%d\n", cid);
 580         if ((ptr = GetDeviceStruct(cid)) == NULL) {
 581                 FIXME("no cid=%d found!\n", cid);
 582                 return -1;
 583         }
 584
 585         ptr->suspended = 1;
 586         ptr->commerror = 0;
 587         return 0;
 588 }
 589
 590 /*****************************************************************************
 591  *      ClearCommBreak  (USER.211)
 592  */
 593 INT16 WINAPI ClearCommBreak16(INT16 cid)
 594 {
 595         struct DosDeviceStruct *ptr;
 596
 597         TRACE("cid=%d\n", cid);
 598         if (!(ptr = GetDeviceStruct(cid))) {
 599                 FIXME("no cid=%d found!\n", cid);
 600                 return -1;
 601         }
 602         ptr->suspended = 0;
 603         ptr->commerror = 0;
 604         return 0;
 605 }
 606
 607 /*****************************************************************************
 608  *      EscapeCommFunction      (USER.214)
 609  */
 610 LONG WINAPI EscapeCommFunction16(UINT16 cid,UINT16 nFunction)
 611 {
 612         struct  DosDeviceStruct *ptr;
 613
 614         TRACE("cid=%d, function=%d\n", cid, nFunction);
 615
 616         switch(nFunction) {
 617         case GETMAXCOM:
 618                 TRACE("GETMAXCOM\n");
 619                 return 4;  /* FIXME */
 620
 621         case GETMAXLPT:
 622                 TRACE("GETMAXLPT\n");
 623                 return FLAG_LPT + 3;  /* FIXME */
 624
 625         case GETBASEIRQ:
 626                 TRACE("GETBASEIRQ\n");
 627                 /* FIXME: use tables */
 628                 /* just fake something for now */
 629                 if (cid & FLAG_LPT) {
 630                         /* LPT1: irq 7, LPT2: irq 5 */
 631                         return (cid & 0x7f) ? 5 : 7;
 632                 } else {
 633                         /* COM1: irq 4, COM2: irq 3,
 634                            COM3: irq 4, COM4: irq 3 */
 635                         return 4 - (cid & 1);
 636                 }
 637         }
 638
 639         if ((ptr = GetDeviceStruct(cid)) == NULL) {
 640                 FIXME("no cid=%d found!\n", cid);
 641                 return -1;
 642         }
 643
 644         switch (nFunction) {
 645         case RESETDEV:
 646         case CLRDTR:
 647         case CLRRTS:
 648         case SETDTR:
 649         case SETRTS:
 650         case SETXOFF:
 651         case SETXON:
 652                 if(EscapeCommFunction(ptr->handle,nFunction))
 653                         return 0;
 654                 else {
 655                         ptr->commerror = WinError();
 656                         return -1;
 657                 }
 658
 659         case CLRBREAK:
 660         case SETBREAK:
 661         default:
 662                 WARN("(cid=%d,nFunction=%d): Unknown function\n",
 663                         cid, nFunction);
 664         }
 665         return -1;
 666 }
 667
 668 /*****************************************************************************
 669  *      FlushComm       (USER.215)
 670  */
 671 INT16 WINAPI FlushComm16(INT16 cid,INT16 fnQueue)
 672 {
 673         DWORD queue;
 674         struct DosDeviceStruct *ptr;
 675
 676         TRACE("cid=%d, queue=%d\n", cid, fnQueue);
 677         if ((ptr = GetDeviceStruct(cid)) == NULL) {
 678                 FIXME("no cid=%d found!\n", cid);
 679                 return -1;
 680         }
 681         switch (fnQueue) {
 682         case 0:
 683                 queue = PURGE_TXABORT;
 684                 ptr->obuf_tail = ptr->obuf_head;
 685                 break;
 686         case 1:
 687                 queue = PURGE_RXABORT;
 688                 ptr->ibuf_head = ptr->ibuf_tail;
 689                 break;
 690         default:
 691                 WARN("(cid=%d,fnQueue=%d):Unknown queue\n",
 692                             cid, fnQueue);
 693                 return -1;
 694         }
 695
 696         if (!PurgeComm(ptr->handle,queue)) {
 697                 ptr->commerror = WinError();
 698                 return -1;
 699         } else {
 700                 ptr->commerror = 0;
 701                 return 0;
 702         }
 703 }
 704
 705 /********************************************************************
 706  *      GetCommError    (USER.203)
 707  */
 708 INT16 WINAPI GetCommError16(INT16 cid,LPCOMSTAT16 lpStat)
 709 {
 710         int             temperror;
 711         struct DosDeviceStruct *ptr;
 712         unsigned char *stol;
 713
 714         if ((ptr = GetDeviceStruct(cid)) == NULL) {
 715                 FIXME("no handle for cid = %0x!\n",cid);
 716                 return -1;
 717         }
 718         if (cid&FLAG_LPT) {
 719             WARN(" cid %d not comm port\n",cid);
 720             return CE_MODE;
 721         }
 722         stol = (unsigned char *)COM[cid].unknown + COMM_MSR_OFFSET;
 723         COMM_MSRUpdate( ptr->handle, stol );
 724
 725         if (lpStat) {
 726                 lpStat->status = 0;
 727
 728                 SleepEx(1,TRUE);
 729
 730                 lpStat->cbOutQue = comm_outbuf(ptr);
 731                 lpStat->cbInQue = comm_inbuf(ptr);
 732
 733                 TRACE("cid %d, error %d, stat %d in %d out %d, stol %x\n",
 734                              cid, ptr->commerror, lpStat->status, lpStat->cbInQue,
 735                              lpStat->cbOutQue, *stol);
 736         }
 737         else
 738                 TRACE("cid %d, error %d, lpStat NULL stol %x\n",
 739                              cid, ptr->commerror, *stol);
 740
 741         /* Return any errors and clear it */
 742         temperror = ptr->commerror;
 743         ptr->commerror = 0;
 744         return(temperror);
 745 }
 746
 747 /*****************************************************************************
 748  *      SetCommEventMask        (USER.208)
 749  */
 750 SEGPTR WINAPI SetCommEventMask16(INT16 cid,UINT16 fuEvtMask)
 751 {
 752         struct DosDeviceStruct *ptr;
 753         unsigned char *stol;
 754
 755         TRACE("cid %d,mask %d\n",cid,fuEvtMask);
 756         if ((ptr = GetDeviceStruct(cid)) == NULL) {
 757                 FIXME("no handle for cid = %0x!\n",cid);
 758             return (SEGPTR)NULL;
 759         }
 760
 761         ptr->eventmask = fuEvtMask;
 762
 763         if (cid&FLAG_LPT) {
 764             WARN(" cid %d not comm port\n",cid);
 765             return (SEGPTR)NULL;
 766         }
 767         /* it's a COM port ? -> modify flags */
 768         stol = (unsigned char *)COM[cid].unknown + COMM_MSR_OFFSET;
 769         COMM_MSRUpdate( ptr->handle, stol );
 770
 771         TRACE(" modem dcd construct %x\n",*stol);
 772         if (!COM[cid].seg_unknown) COM[cid].seg_unknown = MapLS( COM[cid].unknown );
 773         return COM[cid].seg_unknown;
 774 }
 775
 776 /*****************************************************************************
 777  *      GetCommEventMask        (USER.209)
 778  */
 779 UINT16 WINAPI GetCommEventMask16(INT16 cid,UINT16 fnEvtClear)
 780 {
 781         struct DosDeviceStruct *ptr;
 782         WORD events;
 783
 784         TRACE("cid %d, mask %d\n", cid, fnEvtClear);
 785         if ((ptr = GetDeviceStruct(cid)) == NULL) {
 786                 FIXME("no handle for cid = %0x!\n",cid);
 787             return 0;
 788         }
 789
 790         if (cid&FLAG_LPT) {
 791             WARN(" cid %d not comm port\n",cid);
 792             return 0;
 793         }
 794
 795         events = *(WORD*)(COM[cid].unknown) & fnEvtClear;
 796         *(WORD*)(COM[cid].unknown) &= ~fnEvtClear;
 797         return events;
 798 }
 799
 800 /*****************************************************************************
 801  *      SetCommState    (USER.201)
 802  */
 803 INT16 WINAPI SetCommState16(LPDCB16 lpdcb)
 804 {
 805         struct DosDeviceStruct *ptr;
 806         DCB dcb;
 807
 808         TRACE("cid %d, ptr %p\n", lpdcb->Id, lpdcb);
 809         if ((ptr = GetDeviceStruct(lpdcb->Id)) == NULL) {
 810                 FIXME("no handle for cid = %0x!\n",lpdcb->Id);
 811                 return -1;
 812         }
 813
 814         memset(&dcb,0,sizeof(dcb));
 815         dcb.DCBlength = sizeof(dcb);
 816
 817         /*
 818          * according to MSDN, we should first interpret lpdcb->BaudRate as follows:
 819          * 1. if the baud rate is a CBR constant, interpret it.
 820          * 2. if it is greater than 57600, the baud rate is 115200
 821          * 3. use the actual baudrate
 822          * steps 2 and 3 are equivilent to 16550 baudrate divisor = 115200/BaudRate
 823          * see http://support.microsoft.com/support/kb/articles/q108/9/28.asp
 824          */
 825         switch(lpdcb->BaudRate)
 826         {
 827         case CBR_110:    dcb.BaudRate = 110;    break;
 828         case CBR_300:    dcb.BaudRate = 300;    break;
 829         case CBR_600:    dcb.BaudRate = 600;    break;
 830         case CBR_1200:   dcb.BaudRate = 1200;   break;
 831         case CBR_2400:   dcb.BaudRate = 2400;   break;
 832         case CBR_4800:   dcb.BaudRate = 4800;   break;
 833         case CBR_9600:   dcb.BaudRate = 9600;   break;
 834         case CBR_14400:  dcb.BaudRate = 14400;  break;
 835         case CBR_19200:  dcb.BaudRate = 19200;  break;
 836         case CBR_38400:  dcb.BaudRate = 38400;  break;
 837         case CBR_56000:  dcb.BaudRate = 56000;  break;
 838         case CBR_128000: dcb.BaudRate = 128000; break;
 839         case CBR_256000: dcb.BaudRate = 256000; break;
 840         default:
 841                 if(lpdcb->BaudRate>57600)
 842                 dcb.BaudRate = 115200;
 843         else
 844                 dcb.BaudRate = lpdcb->BaudRate;
 845         }
 846
 847         dcb.ByteSize=lpdcb->ByteSize;
 848         dcb.StopBits=lpdcb->StopBits;
 849
 850         dcb.fParity=lpdcb->fParity;
 851         dcb.Parity=lpdcb->Parity;
 852
 853         dcb.fOutxCtsFlow = lpdcb->fOutxCtsFlow;
 854
 855         if (lpdcb->fDtrflow || lpdcb->fRtsflow)
 856                 dcb.fRtsControl = TRUE;
 857
 858         if (lpdcb->fDtrDisable)
 859                 dcb.fDtrControl = TRUE;
 860
 861         ptr->evtchar = lpdcb->EvtChar;
 862
 863         dcb.fInX = lpdcb->fInX;
 864         dcb.fOutX = lpdcb->fOutX;
 865
 866         if (!SetCommState(ptr->handle,&dcb)) {
 867                 ptr->commerror = WinError();
 868                 return -1;
 869         } else {
 870                 ptr->commerror = 0;
 871                 return 0;
 872         }
 873 }
 874
 875 /*****************************************************************************
 876  *      GetCommState    (USER.202)
 877  */
 878 INT16 WINAPI GetCommState16(INT16 cid, LPDCB16 lpdcb)
 879 {
 880         struct DosDeviceStruct *ptr;
 881         DCB dcb;
 882
 883         TRACE("cid %d, ptr %p\n", cid, lpdcb);
 884         if ((ptr = GetDeviceStruct(cid)) == NULL) {
 885                 FIXME("no handle for cid = %0x!\n",cid);
 886                 return -1;
 887         }
 888         if (!GetCommState(ptr->handle,&dcb)) {
 889                 ptr->commerror = WinError();
 890                 return -1;
 891         }
 892
 893         lpdcb->Id = cid;
 894
 895         COMM16_DCBtoDCB16(&dcb,lpdcb);
 896
 897         lpdcb->EvtChar = ptr->evtchar;
 898
 899         ptr->commerror = 0;
 900         return 0;
 901 }
 902
 903 /*****************************************************************************
 904  *      TransmitCommChar        (USER.206)
 905  */
 906 INT16 WINAPI TransmitCommChar16(INT16 cid,CHAR chTransmit)
 907 {
 908         struct DosDeviceStruct *ptr;
 909
 910         TRACE("cid %d, data %d \n", cid, chTransmit);
 911         if ((ptr = GetDeviceStruct(cid)) == NULL) {
 912                 FIXME("no handle for cid = %0x!\n",cid);
 913                 return -1;
 914         }
 915
 916         if (ptr->suspended) {
 917                 ptr->commerror = IE_HARDWARE;
 918                 return -1;
 919         }
 920
 921         if (ptr->xmit >= 0) {
 922           /* character already queued */
 923           /* FIXME: which error would Windows return? */
 924           ptr->commerror = CE_TXFULL;
 925           return -1;
 926         }
 927
 928         if (ptr->obuf_head == ptr->obuf_tail) {
 929           /* transmit queue empty, try to transmit directly */
 930           if(1!=COMM16_WriteFile(ptr->handle, &chTransmit, 1))
 931           {
 932             /* didn't work, queue it */
 933             ptr->xmit = chTransmit;
 934             comm_waitwrite(ptr);
 935           }
 936         } else {
 937           /* data in queue, let this char be transmitted next */
 938           ptr->xmit = chTransmit;
 939           comm_waitwrite(ptr);
 940         }
 941
 942         ptr->commerror = 0;
 943         return 0;
 944 }
 945
 946 /*****************************************************************************
 947  *      UngetCommChar   (USER.212)
 948  */
 949 INT16 WINAPI UngetCommChar16(INT16 cid,CHAR chUnget)
 950 {
 951         struct DosDeviceStruct *ptr;
 952
 953         TRACE("cid %d (char %d)\n", cid, chUnget);
 954         if ((ptr = GetDeviceStruct(cid)) == NULL) {
 955                 FIXME("no handle for cid = %0x!\n",cid);
 956                 return -1;
 957         }
 958
 959         if (ptr->suspended) {
 960                 ptr->commerror = IE_HARDWARE;
 961                 return -1;
 962         }
 963
 964         if (ptr->unget>=0) {
 965           /* character already queued */
 966           /* FIXME: which error would Windows return? */
 967           ptr->commerror = CE_RXOVER;
 968           return -1;
 969         }
 970
 971         ptr->unget = chUnget;
 972
 973         ptr->commerror = 0;
 974         return 0;
 975 }
 976
 977 /*****************************************************************************
 978  *      ReadComm        (USER.204)
 979  */
 980 INT16 WINAPI ReadComm16(INT16 cid,LPSTR lpvBuf,INT16 cbRead)
 981 {
 982         int status, length;
 983         struct DosDeviceStruct *ptr;
 984         LPSTR orgBuf = lpvBuf;
 985
 986         TRACE("cid %d, ptr %p, length %d\n", cid, lpvBuf, cbRead);
 987         if ((ptr = GetDeviceStruct(cid)) == NULL) {
 988                 FIXME("no handle for cid = %0x!\n",cid);
 989                 return -1;
 990         }
 991
 992         if (ptr->suspended) {
 993                 ptr->commerror = IE_HARDWARE;
 994                 return -1;
 995         }
 996
 997         if(0==comm_inbuf(ptr))
 998                 SleepEx(1,TRUE);
 999
1000         /* read unget character */
1001         if (ptr->unget>=0) {
1002                 *lpvBuf++ = ptr->unget;
1003                 ptr->unget = -1;
1004
1005                 length = 1;
1006         } else
1007                 length = 0;
1008
1009         /* read from receive buffer */
1010         while (length < cbRead) {
1011           status = ((ptr->ibuf_head < ptr->ibuf_tail) ?
1012                     ptr->ibuf_size : ptr->ibuf_head) - ptr->ibuf_tail;
1013           if (!status) break;
1014           if ((cbRead - length) < status)
1015             status = cbRead - length;
1016
1017           memcpy(lpvBuf, ptr->inbuf + ptr->ibuf_tail, status);
1018           ptr->ibuf_tail += status;
1019           if (ptr->ibuf_tail >= ptr->ibuf_size)
1020             ptr->ibuf_tail = 0;
1021           lpvBuf += status;
1022           length += status;
1023         }
1024
1025         TRACE("%s\n", debugstr_an( orgBuf, length ));
1026         ptr->commerror = 0;
1027         return length;
1028 }
1029
1030 /*****************************************************************************
1031  *      WriteComm       (USER.205)
1032  */
1033 INT16 WINAPI WriteComm16(INT16 cid, LPSTR lpvBuf, INT16 cbWrite)
1034 {
1035         int status, length;
1036         struct DosDeviceStruct *ptr;
1037
1038         TRACE("cid %d, ptr %p, length %d\n",
1039                 cid, lpvBuf, cbWrite);
1040         if ((ptr = GetDeviceStruct(cid)) == NULL) {
1041                 FIXME("no handle for cid = %0x!\n",cid);
1042                 return -1;
1043         }
1044
1045         if (ptr->suspended) {
1046                 ptr->commerror = IE_HARDWARE;
1047                 return -1;
1048         }
1049
1050         TRACE("%s\n", debugstr_an( lpvBuf, cbWrite ));
1051
1052         length = 0;
1053         while (length < cbWrite) {
1054           if ((ptr->obuf_head == ptr->obuf_tail) && (ptr->xmit < 0)) {
1055             /* no data queued, try to write directly */
1056             status = COMM16_WriteFile(ptr->handle, lpvBuf, cbWrite - length);
1057             if (status > 0) {
1058               lpvBuf += status;
1059               length += status;
1060               continue;
1061             }
1062           }
1063           /* can't write directly, put into transmit buffer */
1064           status = ((ptr->obuf_tail > ptr->obuf_head) ?
1065                     (ptr->obuf_tail-1) : ptr->obuf_size) - ptr->obuf_head;
1066           if (!status) break;
1067           if ((cbWrite - length) < status)
1068             status = cbWrite - length;
1069           memcpy(lpvBuf, ptr->outbuf + ptr->obuf_head, status);
1070           ptr->obuf_head += status;
1071           if (ptr->obuf_head >= ptr->obuf_size)
1072             ptr->obuf_head = 0;
1073           lpvBuf += status;
1074           length += status;
1075           comm_waitwrite(ptr);
1076         }
1077
1078         ptr->commerror = 0;
1079         return length;
1080 }
1081
1082 /***********************************************************************
1083  *           EnableCommNotification   (USER.245)
1084  */
1085 BOOL16 WINAPI EnableCommNotification16( INT16 cid, HWND16 hwnd,
1086                                       INT16 cbWriteNotify, INT16 cbOutQueue )
1087 {
1088         struct DosDeviceStruct *ptr;
1089
1090         TRACE("(%d, %x, %d, %d)\n", cid, hwnd, cbWriteNotify, cbOutQueue);
1091         if ((ptr = GetDeviceStruct(cid)) == NULL) {
1092                 FIXME("no handle for cid = %0x!\n",cid);
1093                 return -1;
1094         }
1095         ptr->wnd = WIN_Handle32( hwnd );
1096         ptr->n_read = cbWriteNotify;
1097         ptr->n_write = cbOutQueue;
1098         return TRUE;
1099 }