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 #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 "wingdi.h"
  66 #include "wine/winuser16.h"
  67 #include "win.h"
  68 #include "user_private.h"
  69
  70 #include "wine/debug.h"
  71
  72 WINE_DEFAULT_DEBUG_CHANNEL(comm);
  73
  74 /* window's semi documented modem status register */
  75 #define COMM_MSR_OFFSET  35
  76 #define MSR_CTS  0x10
  77 #define MSR_DSR  0x20
  78 #define MSR_RI   0x40
  79 #define MSR_RLSD 0x80
  80 #define MSR_MASK (MSR_CTS|MSR_DSR|MSR_RI|MSR_RLSD)
  81
  82 #define FLAG_LPT 0x80
  83
  84 #define MAX_PORTS   9
  85
  86 struct DosDeviceStruct {
  87     HANDLE handle;
  88     int suspended;
  89     int unget,xmit;
  90     int evtchar;
  91     /* events */
  92     int commerror, eventmask;
  93     /* buffers */
  94     char *inbuf,*outbuf;
  95     unsigned ibuf_size,ibuf_head,ibuf_tail;
  96     unsigned obuf_size,obuf_head,obuf_tail;
  97     /* notifications */
  98     HWND wnd;
  99     int n_read, n_write;
 100     OVERLAPPED read_ov, write_ov;
 101     /* save terminal states */
 102     DCB16 dcb;
 103     /* pointer to unknown(==undocumented) comm structure */
 104     SEGPTR seg_unknown;
 105     BYTE unknown[40];
 106 };
 107
 108 static struct DosDeviceStruct COM[MAX_PORTS];
 109 static struct DosDeviceStruct LPT[MAX_PORTS];
 110
 111 /* update window's semi documented modem status register */
 112 /* see knowledge base Q101417 */
 113 static void COMM_MSRUpdate( HANDLE handle, UCHAR * pMsr )
 114 {
 115     UCHAR tmpmsr=0;
 116     DWORD mstat=0;
 117
 118     if(!GetCommModemStatus(handle,&mstat))
 119         return;
 120
 121     if(mstat & MS_CTS_ON) tmpmsr |= MSR_CTS;
 122     if(mstat & MS_DSR_ON) tmpmsr |= MSR_DSR;
 123     if(mstat & MS_RING_ON) tmpmsr |= MSR_RI;
 124     if(mstat & MS_RLSD_ON) tmpmsr |= MSR_RLSD;
 125     *pMsr = (*pMsr & ~MSR_MASK) | tmpmsr;
 126 }
 127
 128 static struct DosDeviceStruct *GetDeviceStruct(int index)
 129 {
 130         if ((index&0x7F)<=MAX_PORTS) {
 131             if (!(index&FLAG_LPT)) {
 132                 if (COM[index].handle)
 133                     return &COM[index];
 134             } else {
 135                 index &= 0x7f;
 136                 if (LPT[index].handle)
 137                     return &LPT[index];
 138             }
 139         }
 140
 141         return NULL;
 142 }
 143
 144 static int    GetCommPort_ov(LPOVERLAPPED ov, int write)
 145 {
 146         int x;
 147
 148         for (x=0; x<MAX_PORTS; x++) {
 149                 if (ov == (write?&COM[x].write_ov:&COM[x].read_ov))
 150                         return x;
 151         }
 152
 153         return -1;
 154 }
 155
 156 static int WinError(void)
 157 {
 158         TRACE("errno = %d\n", errno);
 159         switch (errno) {
 160                 default:
 161                         return CE_IOE;
 162                 }
 163 }
 164
 165 static unsigned comm_inbuf(struct DosDeviceStruct *ptr)
 166 {
 167   return ((ptr->ibuf_tail > ptr->ibuf_head) ? ptr->ibuf_size : 0)
 168     + ptr->ibuf_head - ptr->ibuf_tail;
 169 }
 170
 171 static unsigned comm_outbuf(struct DosDeviceStruct *ptr)
 172 {
 173   return ((ptr->obuf_tail > ptr->obuf_head) ? ptr->obuf_size : 0)
 174     + ptr->obuf_head - ptr->obuf_tail;
 175 }
 176
 177 static void comm_waitread(struct DosDeviceStruct *ptr);
 178 static void comm_waitwrite(struct DosDeviceStruct *ptr);
 179
 180 static VOID WINAPI COMM16_ReadComplete(DWORD dwErrorCode, DWORD len, LPOVERLAPPED ov)
 181 {
 182         int prev;
 183         WORD mask = 0;
 184         int cid = GetCommPort_ov(ov,0);
 185         struct DosDeviceStruct *ptr;
 186
 187         if(cid<0) {
 188                 ERR("async write with bad overlapped pointer\n");
 189                 return;
 190         }
 191         ptr = &COM[cid];
 192
 193         /* we get cancelled when CloseComm is called */
 194         if (dwErrorCode==ERROR_OPERATION_ABORTED)
 195         {
 196                 TRACE("Cancelled\n");
 197                 return;
 198         }
 199
 200         /* read data from comm port */
 201         if (dwErrorCode != NO_ERROR) {
 202                 ERR("async read failed, error %ld\n",dwErrorCode);
 203                 COM[cid].commerror = CE_RXOVER;
 204                 return;
 205         }
 206         TRACE("async read completed %ld bytes\n",len);
 207
 208         prev = comm_inbuf(ptr);
 209
 210         /* check for events */
 211         if ((ptr->eventmask & EV_RXFLAG) &&
 212             memchr(ptr->inbuf + ptr->ibuf_head, ptr->evtchar, len)) {
 213                 *(WORD*)(COM[cid].unknown) |= EV_RXFLAG;
 214                 mask |= CN_EVENT;
 215         }
 216         if (ptr->eventmask & EV_RXCHAR) {
 217                 *(WORD*)(COM[cid].unknown) |= EV_RXCHAR;
 218                 mask |= CN_EVENT;
 219         }
 220
 221         /* advance buffer position */
 222         ptr->ibuf_head += len;
 223         if (ptr->ibuf_head >= ptr->ibuf_size)
 224                 ptr->ibuf_head = 0;
 225
 226         /* check for notification */
 227         if (ptr->wnd && (ptr->n_read>0) && (prev<ptr->n_read) &&
 228             (comm_inbuf(ptr)>=ptr->n_read)) {
 229                 /* passed the receive notification threshold */
 230                 mask |= CN_RECEIVE;
 231         }
 232
 233         /* send notifications, if any */
 234         if (ptr->wnd && mask) {
 235                 TRACE("notifying %p: cid=%d, mask=%02x\n", ptr->wnd, cid, mask);
 236                 PostMessageA(ptr->wnd, WM_COMMNOTIFY, cid, mask);
 237         }
 238
 239         /* on real windows, this could cause problems, since it is recursive */
 240         /* restart the receive */
 241         comm_waitread(ptr);
 242 }
 243
 244 /* this is meant to work like write() */
 245 static INT COMM16_WriteFile(HANDLE hComm, LPCVOID buffer, DWORD len)
 246 {
 247         OVERLAPPED ov;
 248         DWORD count= -1;
 249
 250         ZeroMemory(&ov,sizeof(ov));
 251         ov.hEvent = CreateEventW(NULL,0,0,NULL);
 252         if(ov.hEvent==INVALID_HANDLE_VALUE)
 253                 return -1;
 254
 255         if(!WriteFile(hComm,buffer,len,&count,&ov))
 256         {
 257                 if(GetLastError()==ERROR_IO_PENDING)
 258                 {
 259                         GetOverlappedResult(hComm,&ov,&count,TRUE);
 260                 }
 261         }
 262         CloseHandle(ov.hEvent);
 263
 264         return count;
 265 }
 266
 267 static VOID WINAPI COMM16_WriteComplete(DWORD dwErrorCode, DWORD len, LPOVERLAPPED ov)
 268 {
 269         int prev, bleft;
 270         WORD mask = 0;
 271         int cid = GetCommPort_ov(ov,1);
 272         struct DosDeviceStruct *ptr;
 273
 274         if(cid<0) {
 275                 ERR("async write with bad overlapped pointer\n");
 276                 return;
 277         }
 278         ptr = &COM[cid];
 279
 280         /* read data from comm port */
 281         if (dwErrorCode != NO_ERROR) {
 282                 ERR("async write failed, error %ld\n",dwErrorCode);
 283                 COM[cid].commerror = CE_RXOVER;
 284                 return;
 285         }
 286         TRACE("async write completed %ld bytes\n",len);
 287
 288         /* update the buffer pointers */
 289         prev = comm_outbuf(&COM[cid]);
 290         ptr->obuf_tail += len;
 291         if (ptr->obuf_tail >= ptr->obuf_size)
 292                 ptr->obuf_tail = 0;
 293
 294         /* write any TransmitCommChar character */
 295         if (ptr->xmit>=0) {
 296                 len = COMM16_WriteFile(ptr->handle, &(ptr->xmit), 1);
 297                 if (len > 0) ptr->xmit = -1;
 298         }
 299
 300         /* write from output queue */
 301         bleft = ((ptr->obuf_tail <= ptr->obuf_head) ?
 302                 ptr->obuf_head : ptr->obuf_size) - ptr->obuf_tail;
 303
 304         /* check for notification */
 305         if (ptr->wnd && (ptr->n_write>0) && (prev>=ptr->n_write) &&
 306           (comm_outbuf(ptr)<ptr->n_write)) {
 307                 /* passed the transmit notification threshold */
 308                 mask |= CN_TRANSMIT;
 309         }
 310
 311         /* send notifications, if any */
 312         if (ptr->wnd && mask) {
 313                 TRACE("notifying %p: cid=%d, mask=%02x\n", ptr->wnd, cid, mask);
 314                 PostMessageA(ptr->wnd, WM_COMMNOTIFY, cid, mask);
 315         }
 316
 317         /* start again if necessary */
 318         if(bleft)
 319                 comm_waitwrite(ptr);
 320 }
 321
 322 static void comm_waitread(struct DosDeviceStruct *ptr)
 323 {
 324         unsigned int bleft;
 325         COMSTAT stat;
 326
 327         /* FIXME: get timeouts working properly so we can read bleft bytes */
 328         bleft = ((ptr->ibuf_tail > ptr->ibuf_head) ?
 329                 (ptr->ibuf_tail-1) : ptr->ibuf_size) - ptr->ibuf_head;
 330
 331         /* find out how many bytes are left in the buffer */
 332         if(ClearCommError(ptr->handle,NULL,&stat))
 333                 bleft = (bleft<stat.cbInQue) ? bleft : stat.cbInQue;
 334         else
 335                 bleft = 1;
 336
 337         /* always read at least one byte */
 338         if(bleft==0)
 339                 bleft++;
 340
 341         ReadFileEx(ptr->handle,
 342                 ptr->inbuf + ptr->ibuf_head,
 343                 bleft,
 344                 &ptr->read_ov,
 345                 COMM16_ReadComplete);
 346 }
 347
 348 static void comm_waitwrite(struct DosDeviceStruct *ptr)
 349 {
 350         int bleft;
 351
 352         bleft = ((ptr->obuf_tail <= ptr->obuf_head) ?
 353                 ptr->obuf_head : ptr->obuf_size) - ptr->obuf_tail;
 354         WriteFileEx(ptr->handle,
 355                 ptr->outbuf + ptr->obuf_tail,
 356                 bleft,
 357                 &ptr->write_ov,
 358                 COMM16_WriteComplete);
 359 }
 360
 361 /*****************************************************************************
 362  *      COMM16_DCBtoDCB16       (Internal)
 363  */
 364 INT16 COMM16_DCBtoDCB16(LPDCB lpdcb, LPDCB16 lpdcb16)
 365 {
 366         if(lpdcb->BaudRate<0x10000)
 367                 lpdcb16->BaudRate = lpdcb->BaudRate;
 368         else if(lpdcb->BaudRate==115200)
 369                         lpdcb16->BaudRate = 57601;
 370         else {
 371                 WARN("Baud rate can't be converted\n");
 372                 lpdcb16->BaudRate = 57601;
 373         }
 374         lpdcb16->ByteSize = lpdcb->ByteSize;
 375         lpdcb16->fParity = lpdcb->fParity;
 376         lpdcb16->Parity = lpdcb->Parity;
 377         lpdcb16->StopBits = lpdcb->StopBits;
 378
 379         lpdcb16->RlsTimeout = 50;
 380         lpdcb16->CtsTimeout = 50;
 381         lpdcb16->DsrTimeout = 50;
 382         lpdcb16->fNull = 0;
 383         lpdcb16->fChEvt = 0;
 384         lpdcb16->fBinary = 1;
 385
 386         lpdcb16->fDtrflow = (lpdcb->fDtrControl==DTR_CONTROL_HANDSHAKE);
 387         lpdcb16->fRtsflow = (lpdcb->fRtsControl==RTS_CONTROL_HANDSHAKE);
 388         lpdcb16->fOutxCtsFlow = lpdcb->fOutxCtsFlow;
 389         lpdcb16->fOutxDsrFlow = lpdcb->fOutxDsrFlow;
 390         lpdcb16->fDtrDisable = (lpdcb->fDtrControl==DTR_CONTROL_DISABLE);
 391
 392         lpdcb16->fInX = lpdcb->fInX;
 393
 394         lpdcb16->fOutX = lpdcb->fOutX;
 395 /*
 396         lpdcb16->XonChar =
 397         lpdcb16->XoffChar =
 398  */
 399         lpdcb16->XonLim = 10;
 400         lpdcb16->XoffLim = 10;
 401
 402         return 0;
 403 }
 404
 405
 406 /**************************************************************************
 407  *         BuildCommDCB         (USER.213)
 408  *
 409  * According to the ECMA-234 (368.3) the function will return FALSE on
 410  * success, otherwise it will return -1.
 411  */
 412 INT16 WINAPI BuildCommDCB16(LPCSTR device, LPDCB16 lpdcb)
 413 {
 414         /* "COM1:96,n,8,1"      */
 415         /*  012345              */
 416         int port;
 417         DCB dcb;
 418
 419         TRACE("(%s), ptr %p\n", device, lpdcb);
 420
 421         if (strncasecmp(device,"COM",3))
 422                 return -1;
 423         port = device[3] - '0';
 424
 425         if (port-- == 0) {
 426                 ERR("BUG ! COM0 can't exist!\n");
 427                 return -1;
 428         }
 429
 430         memset(lpdcb, 0, sizeof(DCB16)); /* initialize */
 431
 432         lpdcb->Id = port;
 433         dcb.DCBlength = sizeof(DCB);
 434
 435         if (strchr(device,'=')) /* block new style */
 436                 return -1;
 437
 438         if(!BuildCommDCBA(device,&dcb))
 439                 return -1;
 440
 441         return COMM16_DCBtoDCB16(&dcb, lpdcb);
 442 }
 443
 444 /*****************************************************************************
 445  *      OpenComm                (USER.200)
 446  */
 447 INT16 WINAPI OpenComm16(LPCSTR device,UINT16 cbInQueue,UINT16 cbOutQueue)
 448 {
 449         int port;
 450         HANDLE handle;
 451
 452         TRACE("%s, %d, %d\n", device, cbInQueue, cbOutQueue);
 453
 454         if (strlen(device) < 4)
 455            return IE_BADID;
 456
 457         port = device[3] - '0';
 458
 459         if (port-- == 0)
 460                 ERR("BUG ! COM0 or LPT0 don't exist !\n");
 461
 462         if (!strncasecmp(device,"COM",3))
 463         {
 464                 if (COM[port].handle)
 465                         return IE_OPEN;
 466
 467                 handle = CreateFileA(device, GENERIC_READ|GENERIC_WRITE,
 468                         FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, CREATE_ALWAYS,
 469                         FILE_FLAG_OVERLAPPED|FILE_FLAG_NO_BUFFERING, 0 );
 470                 if (handle == INVALID_HANDLE_VALUE) {
 471                         return IE_HARDWARE;
 472                 } else {
 473                         memset(COM[port].unknown, 0, sizeof(COM[port].unknown));
 474                         COM[port].seg_unknown = 0;
 475                         COM[port].handle = handle;
 476                         COM[port].commerror = 0;
 477                         COM[port].eventmask = 0;
 478                         COM[port].evtchar = 0; /* FIXME: default? */
 479                         /* save terminal state */
 480                         GetCommState16(port,&COM[port].dcb);
 481                         /* init priority characters */
 482                         COM[port].unget = -1;
 483                         COM[port].xmit = -1;
 484                         /* allocate buffers */
 485                         COM[port].ibuf_size = cbInQueue;
 486                         COM[port].ibuf_head = COM[port].ibuf_tail = 0;
 487                         COM[port].obuf_size = cbOutQueue;
 488                         COM[port].obuf_head = COM[port].obuf_tail = 0;
 489
 490                         COM[port].inbuf = HeapAlloc(GetProcessHeap(), 0, cbInQueue);
 491                         if (COM[port].inbuf) {
 492                           COM[port].outbuf = HeapAlloc( GetProcessHeap(), 0, cbOutQueue);
 493                           if (!COM[port].outbuf)
 494                             HeapFree( GetProcessHeap(), 0, COM[port].inbuf);
 495                         } else COM[port].outbuf = NULL;
 496                         if (!COM[port].outbuf) {
 497                           /* not enough memory */
 498                           CloseHandle(COM[port].handle);
 499                           ERR("out of memory\n");
 500                           return IE_MEMORY;
 501                         }
 502
 503                         ZeroMemory(&COM[port].read_ov,sizeof (OVERLAPPED));
 504                         ZeroMemory(&COM[port].write_ov,sizeof (OVERLAPPED));
 505
 506                         comm_waitread( &COM[port] );
 507                         USER16_AlertableWait++;
 508
 509                         return port;
 510                 }
 511         }
 512         else
 513         if (!strncasecmp(device,"LPT",3)) {
 514
 515                 if (LPT[port].handle)
 516                         return IE_OPEN;
 517
 518                 handle = CreateFileA(device, GENERIC_READ|GENERIC_WRITE,
 519                         FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, CREATE_ALWAYS, 0, 0 );
 520                 if (handle == INVALID_HANDLE_VALUE) {
 521                         return IE_HARDWARE;
 522                 } else {
 523                         LPT[port].handle = handle;
 524                         LPT[port].commerror = 0;
 525                         LPT[port].eventmask = 0;
 526                         return port|FLAG_LPT;
 527                 }
 528         }
 529         return IE_BADID;
 530 }
 531
 532 /*****************************************************************************
 533  *      CloseComm               (USER.207)
 534  */
 535 INT16 WINAPI CloseComm16(INT16 cid)
 536 {
 537         struct DosDeviceStruct *ptr;
 538
 539         TRACE("cid=%d\n", cid);
 540         if ((ptr = GetDeviceStruct(cid)) == NULL) {
 541                 FIXME("no cid=%d found!\n", cid);
 542                 return -1;
 543         }
 544         if (!(cid&FLAG_LPT)) {
 545                 /* COM port */
 546                 UnMapLS( COM[cid].seg_unknown );
 547                 USER16_AlertableWait--;
 548                 CancelIo(ptr->handle);
 549
 550                 /* free buffers */
 551                 HeapFree( GetProcessHeap(), 0, ptr->outbuf);
 552                 HeapFree( GetProcessHeap(), 0, ptr->inbuf);
 553
 554                 /* reset modem lines */
 555                 SetCommState16(&COM[cid].dcb);
 556         }
 557
 558         if (!CloseHandle(ptr->handle)) {
 559                 ptr->commerror = WinError();
 560                 /* FIXME: should we clear ptr->handle here? */
 561                 return -1;
 562         } else {
 563                 ptr->commerror = 0;
 564                 ptr->handle = 0;
 565                 return 0;
 566         }
 567 }
 568
 569 /*****************************************************************************
 570  *      SetCommBreak            (USER.210)
 571  */
 572 INT16 WINAPI SetCommBreak16(INT16 cid)
 573 {
 574         struct DosDeviceStruct *ptr;
 575
 576         TRACE("cid=%d\n", cid);
 577         if ((ptr = GetDeviceStruct(cid)) == NULL) {
 578                 FIXME("no cid=%d found!\n", cid);
 579                 return -1;
 580         }
 581
 582         ptr->suspended = 1;
 583         ptr->commerror = 0;
 584         return 0;
 585 }
 586
 587 /*****************************************************************************
 588  *      ClearCommBreak  (USER.211)
 589  */
 590 INT16 WINAPI ClearCommBreak16(INT16 cid)
 591 {
 592         struct DosDeviceStruct *ptr;
 593
 594         TRACE("cid=%d\n", cid);
 595         if (!(ptr = GetDeviceStruct(cid))) {
 596                 FIXME("no cid=%d found!\n", cid);
 597                 return -1;
 598         }
 599         ptr->suspended = 0;
 600         ptr->commerror = 0;
 601         return 0;
 602 }
 603
 604 /*****************************************************************************
 605  *      EscapeCommFunction      (USER.214)
 606  */
 607 LONG WINAPI EscapeCommFunction16(UINT16 cid,UINT16 nFunction)
 608 {
 609         struct  DosDeviceStruct *ptr;
 610
 611         TRACE("cid=%d, function=%d\n", cid, nFunction);
 612
 613         switch(nFunction) {
 614         case GETMAXCOM:
 615                 TRACE("GETMAXCOM\n");
 616                 return 4;  /* FIXME */
 617
 618         case GETMAXLPT:
 619                 TRACE("GETMAXLPT\n");
 620                 return FLAG_LPT + 3;  /* FIXME */
 621
 622         case GETBASEIRQ:
 623                 TRACE("GETBASEIRQ\n");
 624                 /* FIXME: use tables */
 625                 /* just fake something for now */
 626                 if (cid & FLAG_LPT) {
 627                         /* LPT1: irq 7, LPT2: irq 5 */
 628                         return (cid & 0x7f) ? 5 : 7;
 629                 } else {
 630                         /* COM1: irq 4, COM2: irq 3,
 631                            COM3: irq 4, COM4: irq 3 */
 632                         return 4 - (cid & 1);
 633                 }
 634         }
 635
 636         if ((ptr = GetDeviceStruct(cid)) == NULL) {
 637                 FIXME("no cid=%d found!\n", cid);
 638                 return -1;
 639         }
 640
 641         switch (nFunction) {
 642         case RESETDEV:
 643         case CLRDTR:
 644         case CLRRTS:
 645         case SETDTR:
 646         case SETRTS:
 647         case SETXOFF:
 648         case SETXON:
 649                 if(EscapeCommFunction(ptr->handle,nFunction))
 650                         return 0;
 651                 else {
 652                         ptr->commerror = WinError();
 653                         return -1;
 654                 }
 655
 656         case CLRBREAK:
 657         case SETBREAK:
 658         default:
 659                 WARN("(cid=%d,nFunction=%d): Unknown function\n",
 660                         cid, nFunction);
 661         }
 662         return -1;
 663 }
 664
 665 /*****************************************************************************
 666  *      FlushComm       (USER.215)
 667  */
 668 INT16 WINAPI FlushComm16(INT16 cid,INT16 fnQueue)
 669 {
 670         DWORD queue;
 671         struct DosDeviceStruct *ptr;
 672
 673         TRACE("cid=%d, queue=%d\n", cid, fnQueue);
 674         if ((ptr = GetDeviceStruct(cid)) == NULL) {
 675                 FIXME("no cid=%d found!\n", cid);
 676                 return -1;
 677         }
 678         switch (fnQueue) {
 679         case 0:
 680                 queue = PURGE_TXABORT;
 681                 ptr->obuf_tail = ptr->obuf_head;
 682                 break;
 683         case 1:
 684                 queue = PURGE_RXABORT;
 685                 ptr->ibuf_head = ptr->ibuf_tail;
 686                 break;
 687         default:
 688                 WARN("(cid=%d,fnQueue=%d):Unknown queue\n",
 689                             cid, fnQueue);
 690                 return -1;
 691         }
 692
 693         if (!PurgeComm(ptr->handle,queue)) {
 694                 ptr->commerror = WinError();
 695                 return -1;
 696         } else {
 697                 ptr->commerror = 0;
 698                 return 0;
 699         }
 700 }
 701
 702 /********************************************************************
 703  *      GetCommError    (USER.203)
 704  */
 705 INT16 WINAPI GetCommError16(INT16 cid,LPCOMSTAT16 lpStat)
 706 {
 707         int             temperror;
 708         struct DosDeviceStruct *ptr;
 709         unsigned char *stol;
 710
 711         if ((ptr = GetDeviceStruct(cid)) == NULL) {
 712                 FIXME("no handle for cid = %0x!\n",cid);
 713                 return -1;
 714         }
 715         if (cid&FLAG_LPT) {
 716             WARN(" cid %d not comm port\n",cid);
 717             return CE_MODE;
 718         }
 719         stol = (unsigned char *)COM[cid].unknown + COMM_MSR_OFFSET;
 720         COMM_MSRUpdate( ptr->handle, stol );
 721
 722         if (lpStat) {
 723                 lpStat->status = 0;
 724
 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 equivilent 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 }