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 <stdio.h>
  57 #include <string.h>
  58 #include <errno.h>
  59 #include <ctype.h>
  60
  61 #include "windef.h"
  62 #include "winbase.h"
  63 #include "wingdi.h"
  64 #include "winreg.h"
  65 #include "winuser.h"
  66 #include "wine/winuser16.h"
  67 #include "wine/port.h"
  68 #include "win.h"
  69 #include "winerror.h"
  70
  71 #include "wine/debug.h"
  72
  73 WINE_DEFAULT_DEBUG_CHANNEL(comm);
  74
  75 /* window's semi documented modem status register */
  76 #define COMM_MSR_OFFSET  35
  77 #define MSR_CTS  0x10
  78 #define MSR_DSR  0x20
  79 #define MSR_RI   0x40
  80 #define MSR_RLSD 0x80
  81 #define MSR_MASK (MSR_CTS|MSR_DSR|MSR_RI|MSR_RLSD)
  82
  83 #define FLAG_LPT 0x80
  84
  85 #define MAX_PORTS   9
  86
  87 struct DosDeviceStruct {
  88     char *devicename;   /* /dev/ttyS0 */
  89     HANDLE handle;
  90     int suspended;
  91     int unget,xmit;
  92     int baudrate;
  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 void COMM_Init(void)
 132 {
 133         int x;
 134         char option[10], temp[256], *btemp;
 135         HKEY hkey;
 136
 137         for (x=0; x!=MAX_PORTS; x++) {
 138                 strcpy(option,"COMx");
 139                 option[3] = '1' + x;
 140                 option[4] = '\0';
 141
 142                 /* default value */
 143                 strcpy(temp, "*");
 144
 145                 if(!RegOpenKeyA(HKEY_LOCAL_MACHINE, "Software\\Wine\\Wine\\Config\\serialports", &hkey))
 146                 {
 147                     DWORD type, count = sizeof(temp);
 148
 149                     RegQueryValueExA(hkey, option, 0, &type, temp, &count);
 150                     RegCloseKey(hkey);
 151                 }
 152
 153                 if (!strcmp(temp, "*") || *temp == '\0')
 154                         COM[x].devicename = NULL;
 155                 else {
 156                         btemp = strchr(temp,',');
 157                         if (btemp != NULL) {
 158                                 *btemp++ = '\0';
 159                                 COM[x].baudrate = atoi(btemp);
 160                         } else {
 161                                 COM[x].baudrate = -1;
 162                         }
 163                         if ((COM[x].devicename = malloc(strlen(temp)+1)) == NULL)
 164                                 WARN("Can't malloc for device info!\n");
 165                         else {
 166                                 COM[x].handle = 0;
 167                                 strcpy(COM[x].devicename, temp);
 168                                 TRACE("%s = %s\n", option, COM[x].devicename);
 169                         }
 170                 }
 171
 172                 strcpy(option, "LPTx");
 173                 option[3] = '1' + x;
 174                 option[4] = '\0';
 175
 176                 /* default value */
 177                 strcpy(temp, "*");
 178
 179                 if(!RegOpenKeyA(HKEY_LOCAL_MACHINE, "Software\\Wine\\Wine\\Config\\parallelports", &hkey))
 180                 {
 181                     DWORD type, count = sizeof(temp);
 182
 183                     RegQueryValueExA(hkey, option, 0, &type, temp, &count);
 184                     RegCloseKey(hkey);
 185                 }
 186
 187                 if (!strcmp(temp, "*") || *temp == '\0')
 188                         LPT[x].devicename = NULL;
 189                 else {
 190                         if ((LPT[x].devicename = malloc(strlen(temp)+1)) == NULL)
 191                                 WARN("Can't malloc for device info!\n");
 192                         else {
 193                                 LPT[x].handle = 0;
 194                                 strcpy(LPT[x].devicename, temp);
 195                                 TRACE("%s = %s\n", option, LPT[x].devicename);
 196                         }
 197                 }
 198
 199         }
 200 }
 201
 202
 203 static struct DosDeviceStruct *GetDeviceStruct(int index)
 204 {
 205         if ((index&0x7F)<=MAX_PORTS) {
 206             if (!(index&FLAG_LPT)) {
 207                 if (COM[index].handle)
 208                     return &COM[index];
 209             } else {
 210                 index &= 0x7f;
 211                 if (LPT[index].handle)
 212                     return &LPT[index];
 213             }
 214         }
 215
 216         return NULL;
 217 }
 218
 219 static int    GetCommPort_ov(LPOVERLAPPED ov, int write)
 220 {
 221         int x;
 222
 223         for (x=0; x<MAX_PORTS; x++) {
 224                 if (ov == (write?&COM[x].write_ov:&COM[x].read_ov))
 225                         return x;
 226         }
 227
 228         return -1;
 229 }
 230
 231 static int ValidCOMPort(int x)
 232 {
 233         return(x < MAX_PORTS ? (int) COM[x].devicename : 0);
 234 }
 235
 236 static int ValidLPTPort(int x)
 237 {
 238         return(x < MAX_PORTS ? (int) LPT[x].devicename : 0);
 239 }
 240
 241 static int WinError(void)
 242 {
 243         TRACE("errno = %d\n", errno);
 244         switch (errno) {
 245                 default:
 246                         return CE_IOE;
 247                 }
 248 }
 249
 250 static unsigned comm_inbuf(struct DosDeviceStruct *ptr)
 251 {
 252   return ((ptr->ibuf_tail > ptr->ibuf_head) ? ptr->ibuf_size : 0)
 253     + ptr->ibuf_head - ptr->ibuf_tail;
 254 }
 255
 256 static unsigned comm_outbuf(struct DosDeviceStruct *ptr)
 257 {
 258   return ((ptr->obuf_tail > ptr->obuf_head) ? ptr->obuf_size : 0)
 259     + ptr->obuf_head - ptr->obuf_tail;
 260 }
 261
 262 static void comm_waitread(struct DosDeviceStruct *ptr);
 263 static void comm_waitwrite(struct DosDeviceStruct *ptr);
 264
 265 static VOID WINAPI COMM16_ReadComplete(DWORD status, DWORD len, LPOVERLAPPED ov)
 266 {
 267         int prev ;
 268         WORD mask = 0;
 269         int cid = GetCommPort_ov(ov,0);
 270         struct DosDeviceStruct *ptr;
 271
 272         if(cid<0) {
 273                 ERR("async write with bad overlapped pointer\n");
 274                 return;
 275         }
 276         ptr = &COM[cid];
 277
 278         /* we get cancelled when CloseComm is called */
 279         if (status==STATUS_CANCELLED)
 280         {
 281                 TRACE("Cancelled\n");
 282                 return;
 283         }
 284
 285         /* read data from comm port */
 286         if (status != STATUS_SUCCESS) {
 287                 ERR("async read failed %08lx\n",status);
 288                 COM[cid].commerror = CE_RXOVER;
 289                 return;
 290         }
 291         TRACE("async read completed %ld bytes\n",len);
 292
 293         prev = comm_inbuf(ptr);
 294
 295         /* check for events */
 296         if ((ptr->eventmask & EV_RXFLAG) &&
 297             memchr(ptr->inbuf + ptr->ibuf_head, ptr->evtchar, len)) {
 298                 *(WORD*)(COM[cid].unknown) |= EV_RXFLAG;
 299                 mask |= CN_EVENT;
 300         }
 301         if (ptr->eventmask & EV_RXCHAR) {
 302                 *(WORD*)(COM[cid].unknown) |= EV_RXCHAR;
 303                 mask |= CN_EVENT;
 304         }
 305
 306         /* advance buffer position */
 307         ptr->ibuf_head += len;
 308         if (ptr->ibuf_head >= ptr->ibuf_size)
 309                 ptr->ibuf_head = 0;
 310
 311         /* check for notification */
 312         if (ptr->wnd && (ptr->n_read>0) && (prev<ptr->n_read) &&
 313             (comm_inbuf(ptr)>=ptr->n_read)) {
 314                 /* passed the receive notification threshold */
 315                 mask |= CN_RECEIVE;
 316         }
 317
 318         /* send notifications, if any */
 319         if (ptr->wnd && mask) {
 320                 TRACE("notifying %04x: cid=%d, mask=%02x\n", ptr->wnd, cid, mask);
 321                 PostMessageA(ptr->wnd, WM_COMMNOTIFY, cid, mask);
 322         }
 323
 324         /* on real windows, this could cause problems, since it is recursive */
 325         /* restart the receive */
 326         comm_waitread(ptr);
 327 }
 328
 329 /* this is meant to work like write() */
 330 static INT COMM16_WriteFile(HANDLE hComm, LPCVOID buffer, DWORD len)
 331 {
 332         OVERLAPPED ov;
 333         DWORD count= -1;
 334
 335         ZeroMemory(&ov,sizeof ov);
 336         ov.hEvent = CreateEventA(NULL,0,0,NULL);
 337         if(ov.hEvent==INVALID_HANDLE_VALUE)
 338                 return -1;
 339
 340         if(!WriteFile(hComm,buffer,len,&count,&ov))
 341         {
 342                 if(GetLastError()==ERROR_IO_PENDING)
 343                 {
 344                         GetOverlappedResult(hComm,&ov,&count,TRUE);
 345                 }
 346         }
 347         CloseHandle(ov.hEvent);
 348
 349         return count;
 350 }
 351
 352 static VOID WINAPI COMM16_WriteComplete(DWORD status, DWORD len, LPOVERLAPPED ov)
 353 {
 354         int prev, bleft;
 355         WORD mask = 0;
 356         int cid = GetCommPort_ov(ov,1);
 357         struct DosDeviceStruct *ptr;
 358
 359         if(cid<0) {
 360                 ERR("async write with bad overlapped pointer\n");
 361                 return;
 362         }
 363         ptr = &COM[cid];
 364
 365         /* read data from comm port */
 366         if (status != STATUS_SUCCESS) {
 367                 ERR("async write failed\n");
 368                 COM[cid].commerror = CE_RXOVER;
 369                 return;
 370         }
 371         TRACE("async write completed %ld bytes\n",len);
 372
 373         /* update the buffer pointers */
 374         prev = comm_outbuf(&COM[cid]);
 375         ptr->obuf_tail += len;
 376         if (ptr->obuf_tail >= ptr->obuf_size)
 377                 ptr->obuf_tail = 0;
 378
 379         /* write any TransmitCommChar character */
 380         if (ptr->xmit>=0) {
 381                 len = COMM16_WriteFile(ptr->handle, &(ptr->xmit), 1);
 382                 if (len > 0) ptr->xmit = -1;
 383         }
 384
 385         /* write from output queue */
 386         bleft = ((ptr->obuf_tail <= ptr->obuf_head) ?
 387                 ptr->obuf_head : ptr->obuf_size) - ptr->obuf_tail;
 388
 389         /* check for notification */
 390         if (ptr->wnd && (ptr->n_write>0) && (prev>=ptr->n_write) &&
 391           (comm_outbuf(ptr)<ptr->n_write)) {
 392                 /* passed the transmit notification threshold */
 393                 mask |= CN_TRANSMIT;
 394         }
 395
 396         /* send notifications, if any */
 397         if (ptr->wnd && mask) {
 398                 TRACE("notifying %04x: cid=%d, mask=%02x\n", ptr->wnd, cid, mask);
 399                 PostMessageA(ptr->wnd, WM_COMMNOTIFY, cid, mask);
 400         }
 401
 402         /* start again if necessary */
 403         if(bleft)
 404                 comm_waitwrite(ptr);
 405 }
 406
 407 static void comm_waitread(struct DosDeviceStruct *ptr)
 408 {
 409         int bleft;
 410         COMSTAT stat;
 411
 412         /* FIXME: get timeouts working properly so we can read bleft bytes */
 413         bleft = ((ptr->ibuf_tail > ptr->ibuf_head) ?
 414                 (ptr->ibuf_tail-1) : ptr->ibuf_size) - ptr->ibuf_head;
 415
 416         /* find out how many bytes are left in the buffer */
 417         if(ClearCommError(ptr->handle,NULL,&stat))
 418                 bleft = (bleft<stat.cbInQue) ? bleft : stat.cbInQue;
 419         else
 420                 bleft = 1;
 421
 422         /* always read at least one byte */
 423         if(bleft==0)
 424                 bleft++;
 425
 426         ReadFileEx(ptr->handle,
 427                 ptr->inbuf + ptr->ibuf_head,
 428                 bleft,
 429                 &ptr->read_ov,
 430                 COMM16_ReadComplete);
 431 }
 432
 433 static void comm_waitwrite(struct DosDeviceStruct *ptr)
 434 {
 435         int bleft;
 436
 437         bleft = ((ptr->obuf_tail <= ptr->obuf_head) ?
 438                 ptr->obuf_head : ptr->obuf_size) - ptr->obuf_tail;
 439         WriteFileEx(ptr->handle,
 440                 ptr->outbuf + ptr->obuf_tail,
 441                 bleft,
 442                 &ptr->write_ov,
 443                 COMM16_WriteComplete);
 444 }
 445
 446 /*****************************************************************************
 447  *      COMM16_DCBtoDCB16       (Internal)
 448  */
 449 INT16 COMM16_DCBtoDCB16(LPDCB lpdcb, LPDCB16 lpdcb16)
 450 {
 451         if(lpdcb->BaudRate<0x10000)
 452                 lpdcb16->BaudRate = lpdcb->BaudRate;
 453         else if(lpdcb->BaudRate==115200)
 454                         lpdcb16->BaudRate = 57601;
 455         else {
 456                 WARN("Baud rate can't be converted\n");
 457                 lpdcb16->BaudRate = 57601;
 458         }
 459         lpdcb16->ByteSize = lpdcb->ByteSize;
 460         lpdcb16->fParity = lpdcb->fParity;
 461         lpdcb16->Parity = lpdcb->Parity;
 462         lpdcb16->StopBits = lpdcb->StopBits;
 463
 464         lpdcb16->RlsTimeout = 50;
 465         lpdcb16->CtsTimeout = 50;
 466         lpdcb16->DsrTimeout = 50;
 467         lpdcb16->fNull = 0;
 468         lpdcb16->fChEvt = 0;
 469         lpdcb16->fBinary = 1;
 470
 471         lpdcb16->fDtrflow = (lpdcb->fDtrControl==DTR_CONTROL_HANDSHAKE);
 472         lpdcb16->fRtsflow = (lpdcb->fRtsControl==RTS_CONTROL_HANDSHAKE);
 473         lpdcb16->fOutxCtsFlow = lpdcb->fOutxCtsFlow;
 474         lpdcb16->fOutxDsrFlow = lpdcb->fOutxDsrFlow;
 475         lpdcb16->fDtrDisable = (lpdcb->fDtrControl==DTR_CONTROL_DISABLE);
 476
 477         lpdcb16->fInX = lpdcb->fInX;
 478
 479         lpdcb16->fOutX = lpdcb->fOutX;
 480 /*
 481         lpdcb16->XonChar =
 482         lpdcb16->XoffChar =
 483  */
 484         lpdcb16->XonLim = 10;
 485         lpdcb16->XoffLim = 10;
 486
 487         return 0;
 488 }
 489
 490
 491 /**************************************************************************
 492  *         BuildCommDCB         (USER.213)
 493  *
 494  * According to the ECMA-234 (368.3) the function will return FALSE on
 495  * success, otherwise it will return -1.
 496  */
 497 INT16 WINAPI BuildCommDCB16(LPCSTR device, LPDCB16 lpdcb)
 498 {
 499         /* "COM1:96,n,8,1"      */
 500         /*  012345              */
 501         int port;
 502         DCB dcb;
 503
 504         TRACE("(%s), ptr %p\n", device, lpdcb);
 505
 506         if (strncasecmp(device,"COM",3))
 507                 return -1;
 508         port = device[3] - '0';
 509
 510         if (port-- == 0) {
 511                 ERR("BUG ! COM0 can't exist!\n");
 512                 return -1;
 513         }
 514
 515         if (!ValidCOMPort(port)) {
 516                 FIXME("invalid COM port %d?\n",port);
 517                 return -1;
 518         }
 519
 520         memset(lpdcb, 0, sizeof(DCB16)); /* initialize */
 521
 522         lpdcb->Id = port;
 523         dcb.DCBlength = sizeof(DCB);
 524
 525         if (strchr(device,'=')) /* block new style */
 526                 return -1;
 527
 528         if(!BuildCommDCBA(device,&dcb))
 529                 return -1;
 530
 531         return COMM16_DCBtoDCB16(&dcb, lpdcb);
 532 }
 533
 534 /*****************************************************************************
 535  *      OpenComm                (USER.200)
 536  */
 537 INT16 WINAPI OpenComm16(LPCSTR device,UINT16 cbInQueue,UINT16 cbOutQueue)
 538 {
 539         int port;
 540         HANDLE handle;
 541
 542         TRACE("%s, %d, %d\n", device, cbInQueue, cbOutQueue);
 543
 544         if (strlen(device) < 4)
 545            return IE_BADID;
 546
 547         port = device[3] - '0';
 548
 549         if (port-- == 0)
 550                 ERR("BUG ! COM0 or LPT0 don't exist !\n");
 551
 552         if (!strncasecmp(device,"COM",3)) {
 553
 554                 TRACE("%s = %s\n", device, COM[port].devicename);
 555
 556                 if (!ValidCOMPort(port))
 557                         return IE_BADID;
 558
 559                 if (COM[port].handle)
 560                         return IE_OPEN;
 561
 562                 handle = CreateFileA(device, GENERIC_READ|GENERIC_WRITE,
 563                         FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, CREATE_ALWAYS,
 564                         FILE_FLAG_OVERLAPPED|FILE_FLAG_NO_BUFFERING, 0 );
 565                 if (handle == INVALID_HANDLE_VALUE) {
 566                         ERR("Couldn't open %s ! (%s)\n", COM[port].devicename, strerror(errno));
 567                         return IE_HARDWARE;
 568                 } else {
 569                         memset(COM[port].unknown, 0, sizeof(COM[port].unknown));
 570                         COM[port].seg_unknown = 0;
 571                         COM[port].handle = handle;
 572                         COM[port].commerror = 0;
 573                         COM[port].eventmask = 0;
 574                         COM[port].evtchar = 0; /* FIXME: default? */
 575                         /* save terminal state */
 576                         GetCommState16(port,&COM[port].dcb);
 577                         /* set default parameters */
 578                         if(COM[port].baudrate>-1){
 579                             DCB16 dcb;
 580                             memcpy(&dcb,&COM[port].dcb,sizeof dcb);
 581                             dcb.BaudRate=COM[port].baudrate;
 582                             /* more defaults:
 583                              * databits, parity, stopbits
 584                              */
 585                             SetCommState16( &dcb);
 586                         }
 587                         /* init priority characters */
 588                         COM[port].unget = -1;
 589                         COM[port].xmit = -1;
 590                         /* allocate buffers */
 591                         COM[port].ibuf_size = cbInQueue;
 592                         COM[port].ibuf_head = COM[port].ibuf_tail = 0;
 593                         COM[port].obuf_size = cbOutQueue;
 594                         COM[port].obuf_head = COM[port].obuf_tail = 0;
 595
 596                         COM[port].inbuf = malloc(cbInQueue);
 597                         if (COM[port].inbuf) {
 598                           COM[port].outbuf = malloc(cbOutQueue);
 599                           if (!COM[port].outbuf)
 600                             free(COM[port].inbuf);
 601                         } else COM[port].outbuf = NULL;
 602                         if (!COM[port].outbuf) {
 603                           /* not enough memory */
 604                           SetCommState16(&COM[port].dcb);
 605                           CloseHandle(COM[port].handle);
 606                           ERR("out of memory\n");
 607                           return IE_MEMORY;
 608                         }
 609
 610                         ZeroMemory(&COM[port].read_ov,sizeof (OVERLAPPED));
 611                         ZeroMemory(&COM[port].write_ov,sizeof (OVERLAPPED));
 612
 613                         comm_waitread( &COM[port] );
 614                         USER16_AlertableWait++;
 615
 616                         return port;
 617                 }
 618         }
 619         else
 620         if (!strncasecmp(device,"LPT",3)) {
 621
 622                 if (!ValidLPTPort(port))
 623                         return IE_BADID;
 624
 625                 if (LPT[port].handle)
 626                         return IE_OPEN;
 627
 628                 handle = CreateFileA(device, GENERIC_READ|GENERIC_WRITE,
 629                         FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, CREATE_ALWAYS, 0, 0 );
 630                 if (handle == INVALID_HANDLE_VALUE) {
 631                         return IE_HARDWARE;
 632                 } else {
 633                         LPT[port].handle = handle;
 634                         LPT[port].commerror = 0;
 635                         LPT[port].eventmask = 0;
 636                         return port|FLAG_LPT;
 637                 }
 638         }
 639         return IE_BADID;
 640 }
 641
 642 /*****************************************************************************
 643  *      CloseComm               (USER.207)
 644  */
 645 INT16 WINAPI CloseComm16(INT16 cid)
 646 {
 647         struct DosDeviceStruct *ptr;
 648
 649         TRACE("cid=%d\n", cid);
 650         if ((ptr = GetDeviceStruct(cid)) == NULL) {
 651                 FIXME("no cid=%d found!\n", cid);
 652                 return -1;
 653         }
 654         if (!(cid&FLAG_LPT)) {
 655                 /* COM port */
 656                 UnMapLS( COM[cid].seg_unknown );
 657                 USER16_AlertableWait--;
 658                 CancelIo(ptr->handle);
 659
 660                 /* free buffers */
 661                 free(ptr->outbuf);
 662                 free(ptr->inbuf);
 663
 664                 /* reset modem lines */
 665                 SetCommState16(&COM[cid].dcb);
 666         }
 667
 668         if (!CloseHandle(ptr->handle)) {
 669                 ptr->commerror = WinError();
 670                 /* FIXME: should we clear ptr->handle here? */
 671                 return -1;
 672         } else {
 673                 ptr->commerror = 0;
 674                 ptr->handle = 0;
 675                 return 0;
 676         }
 677 }
 678
 679 /*****************************************************************************
 680  *      SetCommBreak            (USER.210)
 681  */
 682 INT16 WINAPI SetCommBreak16(INT16 cid)
 683 {
 684         struct DosDeviceStruct *ptr;
 685
 686         TRACE("cid=%d\n", cid);
 687         if ((ptr = GetDeviceStruct(cid)) == NULL) {
 688                 FIXME("no cid=%d found!\n", cid);
 689                 return -1;
 690         }
 691
 692         ptr->suspended = 1;
 693         ptr->commerror = 0;
 694         return 0;
 695 }
 696
 697 /*****************************************************************************
 698  *      ClearCommBreak  (USER.211)
 699  */
 700 INT16 WINAPI ClearCommBreak16(INT16 cid)
 701 {
 702         struct DosDeviceStruct *ptr;
 703
 704         TRACE("cid=%d\n", cid);
 705         if (!(ptr = GetDeviceStruct(cid))) {
 706                 FIXME("no cid=%d found!\n", cid);
 707                 return -1;
 708         }
 709         ptr->suspended = 0;
 710         ptr->commerror = 0;
 711         return 0;
 712 }
 713
 714 /*****************************************************************************
 715  *      EscapeCommFunction      (USER.214)
 716  */
 717 LONG WINAPI EscapeCommFunction16(UINT16 cid,UINT16 nFunction)
 718 {
 719         struct  DosDeviceStruct *ptr;
 720         int     max;
 721
 722         TRACE("cid=%d, function=%d\n", cid, nFunction);
 723
 724         switch(nFunction) {
 725         case GETMAXCOM:
 726                 TRACE("GETMAXCOM\n");
 727                 for (max = MAX_PORTS;!COM[max].devicename;max--)
 728                         ;
 729                 return max;
 730
 731         case GETMAXLPT:
 732                 TRACE("GETMAXLPT\n");
 733                 for (max = MAX_PORTS;!LPT[max].devicename;max--)
 734                         ;
 735                 return FLAG_LPT + max;
 736
 737         case GETBASEIRQ:
 738                 TRACE("GETBASEIRQ\n");
 739                 /* FIXME: use tables */
 740                 /* just fake something for now */
 741                 if (cid & FLAG_LPT) {
 742                         /* LPT1: irq 7, LPT2: irq 5 */
 743                         return (cid & 0x7f) ? 5 : 7;
 744                 } else {
 745                         /* COM1: irq 4, COM2: irq 3,
 746                            COM3: irq 4, COM4: irq 3 */
 747                         return 4 - (cid & 1);
 748                 }
 749         }
 750
 751         if ((ptr = GetDeviceStruct(cid)) == NULL) {
 752                 FIXME("no cid=%d found!\n", cid);
 753                 return -1;
 754         }
 755
 756         switch (nFunction) {
 757         case RESETDEV:
 758         case CLRDTR:
 759         case CLRRTS:
 760         case SETDTR:
 761         case SETRTS:
 762         case SETXOFF:
 763         case SETXON:
 764                 if(EscapeCommFunction(ptr->handle,nFunction))
 765                         return 0;
 766                 else {
 767                         ptr->commerror = WinError();
 768                         return -1;
 769                 }
 770
 771         case CLRBREAK:
 772         case SETBREAK:
 773         default:
 774                 WARN("(cid=%d,nFunction=%d): Unknown function\n",
 775                         cid, nFunction);
 776         }
 777         return -1;
 778 }
 779
 780 /*****************************************************************************
 781  *      FlushComm       (USER.215)
 782  */
 783 INT16 WINAPI FlushComm16(INT16 cid,INT16 fnQueue)
 784 {
 785         DWORD queue;
 786         struct DosDeviceStruct *ptr;
 787
 788         TRACE("cid=%d, queue=%d\n", cid, fnQueue);
 789         if ((ptr = GetDeviceStruct(cid)) == NULL) {
 790                 FIXME("no cid=%d found!\n", cid);
 791                 return -1;
 792         }
 793         switch (fnQueue) {
 794         case 0:
 795                 queue = PURGE_TXABORT;
 796                 ptr->obuf_tail = ptr->obuf_head;
 797                 break;
 798         case 1:
 799                 queue = PURGE_RXABORT;
 800                 ptr->ibuf_head = ptr->ibuf_tail;
 801                 break;
 802         default:
 803                 WARN("(cid=%d,fnQueue=%d):Unknown queue\n",
 804                             cid, fnQueue);
 805                 return -1;
 806         }
 807
 808         if (!PurgeComm(ptr->handle,queue)) {
 809                 ptr->commerror = WinError();
 810                 return -1;
 811         } else {
 812                 ptr->commerror = 0;
 813                 return 0;
 814         }
 815 }
 816
 817 /********************************************************************
 818  *      GetCommError    (USER.203)
 819  */
 820 INT16 WINAPI GetCommError16(INT16 cid,LPCOMSTAT16 lpStat)
 821 {
 822         int             temperror;
 823         struct DosDeviceStruct *ptr;
 824         unsigned char *stol;
 825
 826         if ((ptr = GetDeviceStruct(cid)) == NULL) {
 827                 FIXME("no handle for cid = %0x!\n",cid);
 828                 return -1;
 829         }
 830         if (cid&FLAG_LPT) {
 831             WARN(" cid %d not comm port\n",cid);
 832             return CE_MODE;
 833         }
 834         stol = (unsigned char *)COM[cid].unknown + COMM_MSR_OFFSET;
 835         COMM_MSRUpdate( ptr->handle, stol );
 836
 837         if (lpStat) {
 838                 lpStat->status = 0;
 839
 840                 WaitForMultipleObjectsEx(0,NULL,FALSE,1,TRUE);
 841
 842                 lpStat->cbOutQue = comm_outbuf(ptr);
 843                 lpStat->cbInQue = comm_inbuf(ptr);
 844
 845                 TRACE("cid %d, error %d, stat %d in %d out %d, stol %x\n",
 846                              cid, ptr->commerror, lpStat->status, lpStat->cbInQue,
 847                              lpStat->cbOutQue, *stol);
 848         }
 849         else
 850                 TRACE("cid %d, error %d, lpStat NULL stol %x\n",
 851                              cid, ptr->commerror, *stol);
 852
 853         /* Return any errors and clear it */
 854         temperror = ptr->commerror;
 855         ptr->commerror = 0;
 856         return(temperror);
 857 }
 858
 859 /*****************************************************************************
 860  *      SetCommEventMask        (USER.208)
 861  */
 862 SEGPTR WINAPI SetCommEventMask16(INT16 cid,UINT16 fuEvtMask)
 863 {
 864         struct DosDeviceStruct *ptr;
 865         unsigned char *stol;
 866
 867         TRACE("cid %d,mask %d\n",cid,fuEvtMask);
 868         if ((ptr = GetDeviceStruct(cid)) == NULL) {
 869                 FIXME("no handle for cid = %0x!\n",cid);
 870             return (SEGPTR)NULL;
 871         }
 872
 873         ptr->eventmask = fuEvtMask;
 874
 875         if ((cid&FLAG_LPT) || !ValidCOMPort(cid)) {
 876             WARN(" cid %d not comm port\n",cid);
 877             return (SEGPTR)NULL;
 878         }
 879         /* it's a COM port ? -> modify flags */
 880         stol = (unsigned char *)COM[cid].unknown + COMM_MSR_OFFSET;
 881         COMM_MSRUpdate( ptr->handle, stol );
 882
 883         TRACE(" modem dcd construct %x\n",*stol);
 884         if (!COM[cid].seg_unknown) COM[cid].seg_unknown = MapLS( COM[cid].unknown );
 885         return COM[cid].seg_unknown;
 886 }
 887
 888 /*****************************************************************************
 889  *      GetCommEventMask        (USER.209)
 890  */
 891 UINT16 WINAPI GetCommEventMask16(INT16 cid,UINT16 fnEvtClear)
 892 {
 893         struct DosDeviceStruct *ptr;
 894         WORD events;
 895
 896         TRACE("cid %d, mask %d\n", cid, fnEvtClear);
 897         if ((ptr = GetDeviceStruct(cid)) == NULL) {
 898                 FIXME("no handle for cid = %0x!\n",cid);
 899             return 0;
 900         }
 901
 902         if ((cid&FLAG_LPT) || !ValidCOMPort(cid)) {
 903             WARN(" cid %d not comm port\n",cid);
 904             return 0;
 905         }
 906
 907         events = *(WORD*)(COM[cid].unknown) & fnEvtClear;
 908         *(WORD*)(COM[cid].unknown) &= ~fnEvtClear;
 909         return events;
 910 }
 911
 912 /*****************************************************************************
 913  *      SetCommState    (USER.201)
 914  */
 915 INT16 WINAPI SetCommState16(LPDCB16 lpdcb)
 916 {
 917         struct DosDeviceStruct *ptr;
 918         DCB dcb;
 919
 920         TRACE("cid %d, ptr %p\n", lpdcb->Id, lpdcb);
 921         if ((ptr = GetDeviceStruct(lpdcb->Id)) == NULL) {
 922                 FIXME("no handle for cid = %0x!\n",lpdcb->Id);
 923                 return -1;
 924         }
 925
 926         memset(&dcb,0,sizeof dcb);
 927         dcb.DCBlength = sizeof dcb;
 928
 929         /*
 930          * according to MSDN, we should first interpret lpdcb->BaudRate as follows:
 931          * 1. if the baud rate is a CBR constant, interpret it.
 932          * 2. if it is greater than 57600, the baud rate is 115200
 933          * 3. use the actual baudrate
 934          * steps 2 and 3 are equivilent to 16550 baudrate divisor = 115200/BaudRate
 935          * see http://support.microsoft.com/support/kb/articles/q108/9/28.asp
 936          */
 937         switch(lpdcb->BaudRate)
 938         {
 939         case CBR_110:    dcb.BaudRate = 110;    break;
 940         case CBR_300:    dcb.BaudRate = 300;    break;
 941         case CBR_600:    dcb.BaudRate = 600;    break;
 942         case CBR_1200:   dcb.BaudRate = 1200;   break;
 943         case CBR_2400:   dcb.BaudRate = 2400;   break;
 944         case CBR_4800:   dcb.BaudRate = 4800;   break;
 945         case CBR_9600:   dcb.BaudRate = 9600;   break;
 946         case CBR_14400:  dcb.BaudRate = 14400;  break;
 947         case CBR_19200:  dcb.BaudRate = 19200;  break;
 948         case CBR_38400:  dcb.BaudRate = 38400;  break;
 949         case CBR_56000:  dcb.BaudRate = 56000;  break;
 950         case CBR_128000: dcb.BaudRate = 128000; break;
 951         case CBR_256000: dcb.BaudRate = 256000; break;
 952         default:
 953                 if(lpdcb->BaudRate>57600)
 954                 dcb.BaudRate = 115200;
 955         else
 956                 dcb.BaudRate = lpdcb->BaudRate;
 957         }
 958
 959         dcb.ByteSize=lpdcb->ByteSize;
 960         dcb.StopBits=lpdcb->StopBits;
 961
 962         dcb.fParity=lpdcb->fParity;
 963         dcb.Parity=lpdcb->Parity;
 964
 965         dcb.fOutxCtsFlow = lpdcb->fOutxCtsFlow;
 966
 967         if (lpdcb->fDtrflow || lpdcb->fRtsflow)
 968                 dcb.fRtsControl = TRUE;
 969
 970         if (lpdcb->fDtrDisable)
 971                 dcb.fDtrControl = TRUE;
 972
 973         ptr->evtchar = lpdcb->EvtChar;
 974
 975         dcb.fInX = lpdcb->fInX;
 976         dcb.fOutX = lpdcb->fOutX;
 977
 978         if (!SetCommState(ptr->handle,&dcb)) {
 979                 ptr->commerror = WinError();
 980                 return -1;
 981         } else {
 982                 ptr->commerror = 0;
 983                 return 0;
 984         }
 985 }
 986
 987 /*****************************************************************************
 988  *      GetCommState    (USER.202)
 989  */
 990 INT16 WINAPI GetCommState16(INT16 cid, LPDCB16 lpdcb)
 991 {
 992         struct DosDeviceStruct *ptr;
 993         DCB dcb;
 994
 995         TRACE("cid %d, ptr %p\n", cid, lpdcb);
 996         if ((ptr = GetDeviceStruct(cid)) == NULL) {
 997                 FIXME("no handle for cid = %0x!\n",cid);
 998                 return -1;
 999         }
1000         if (!GetCommState(ptr->handle,&dcb)) {
1001                 ptr->commerror = WinError();
1002                 return -1;
1003         }
1004
1005         lpdcb->Id = cid;
1006
1007         COMM16_DCBtoDCB16(&dcb,lpdcb);
1008
1009         lpdcb->EvtChar = ptr->evtchar;
1010
1011         ptr->commerror = 0;
1012         return 0;
1013 }
1014
1015 /*****************************************************************************
1016  *      TransmitCommChar        (USER.206)
1017  */
1018 INT16 WINAPI TransmitCommChar16(INT16 cid,CHAR chTransmit)
1019 {
1020         struct DosDeviceStruct *ptr;
1021
1022         TRACE("cid %d, data %d \n", cid, chTransmit);
1023         if ((ptr = GetDeviceStruct(cid)) == NULL) {
1024                 FIXME("no handle for cid = %0x!\n",cid);
1025                 return -1;
1026         }
1027
1028         if (ptr->suspended) {
1029                 ptr->commerror = IE_HARDWARE;
1030                 return -1;
1031         }
1032
1033         if (ptr->xmit >= 0) {
1034           /* character already queued */
1035           /* FIXME: which error would Windows return? */
1036           ptr->commerror = CE_TXFULL;
1037           return -1;
1038         }
1039
1040         if (ptr->obuf_head == ptr->obuf_tail) {
1041           /* transmit queue empty, try to transmit directly */
1042           if(1!=COMM16_WriteFile(ptr->handle, &chTransmit, 1))
1043           {
1044             /* didn't work, queue it */
1045             ptr->xmit = chTransmit;
1046             comm_waitwrite(ptr);
1047           }
1048         } else {
1049           /* data in queue, let this char be transmitted next */
1050           ptr->xmit = chTransmit;
1051           comm_waitwrite(ptr);
1052         }
1053
1054         ptr->commerror = 0;
1055         return 0;
1056 }
1057
1058 /*****************************************************************************
1059  *      UngetCommChar   (USER.212)
1060  */
1061 INT16 WINAPI UngetCommChar16(INT16 cid,CHAR chUnget)
1062 {
1063         struct DosDeviceStruct *ptr;
1064
1065         TRACE("cid %d (char %d)\n", cid, chUnget);
1066         if ((ptr = GetDeviceStruct(cid)) == NULL) {
1067                 FIXME("no handle for cid = %0x!\n",cid);
1068                 return -1;
1069         }
1070
1071         if (ptr->suspended) {
1072                 ptr->commerror = IE_HARDWARE;
1073                 return -1;
1074         }
1075
1076         if (ptr->unget>=0) {
1077           /* character already queued */
1078           /* FIXME: which error would Windows return? */
1079           ptr->commerror = CE_RXOVER;
1080           return -1;
1081         }
1082
1083         ptr->unget = chUnget;
1084
1085         ptr->commerror = 0;
1086         return 0;
1087 }
1088
1089 /*****************************************************************************
1090  *      ReadComm        (USER.204)
1091  */
1092 INT16 WINAPI ReadComm16(INT16 cid,LPSTR lpvBuf,INT16 cbRead)
1093 {
1094         int status, length;
1095         struct DosDeviceStruct *ptr;
1096         LPSTR orgBuf = lpvBuf;
1097
1098         TRACE("cid %d, ptr %p, length %d\n", cid, lpvBuf, cbRead);
1099         if ((ptr = GetDeviceStruct(cid)) == NULL) {
1100                 FIXME("no handle for cid = %0x!\n",cid);
1101                 return -1;
1102         }
1103
1104         if (ptr->suspended) {
1105                 ptr->commerror = IE_HARDWARE;
1106                 return -1;
1107         }
1108
1109         if(0==comm_inbuf(ptr))
1110                 WaitForMultipleObjectsEx(0,NULL,FALSE,1,TRUE);
1111
1112         /* read unget character */
1113         if (ptr->unget>=0) {
1114                 *lpvBuf++ = ptr->unget;
1115                 ptr->unget = -1;
1116
1117                 length = 1;
1118         } else
1119                 length = 0;
1120
1121         /* read from receive buffer */
1122         while (length < cbRead) {
1123           status = ((ptr->ibuf_head < ptr->ibuf_tail) ?
1124                     ptr->ibuf_size : ptr->ibuf_head) - ptr->ibuf_tail;
1125           if (!status) break;
1126           if ((cbRead - length) < status)
1127             status = cbRead - length;
1128
1129           memcpy(lpvBuf, ptr->inbuf + ptr->ibuf_tail, status);
1130           ptr->ibuf_tail += status;
1131           if (ptr->ibuf_tail >= ptr->ibuf_size)
1132             ptr->ibuf_tail = 0;
1133           lpvBuf += status;
1134           length += status;
1135         }
1136
1137         TRACE("%s\n", debugstr_an( orgBuf, length ));
1138         ptr->commerror = 0;
1139         return length;
1140 }
1141
1142 /*****************************************************************************
1143  *      WriteComm       (USER.205)
1144  */
1145 INT16 WINAPI WriteComm16(INT16 cid, LPSTR lpvBuf, INT16 cbWrite)
1146 {
1147         int status, length;
1148         struct DosDeviceStruct *ptr;
1149
1150         TRACE("cid %d, ptr %p, length %d\n",
1151                 cid, lpvBuf, cbWrite);
1152         if ((ptr = GetDeviceStruct(cid)) == NULL) {
1153                 FIXME("no handle for cid = %0x!\n",cid);
1154                 return -1;
1155         }
1156
1157         if (ptr->suspended) {
1158                 ptr->commerror = IE_HARDWARE;
1159                 return -1;
1160         }
1161
1162         TRACE("%s\n", debugstr_an( lpvBuf, cbWrite ));
1163
1164         length = 0;
1165         while (length < cbWrite) {
1166           if ((ptr->obuf_head == ptr->obuf_tail) && (ptr->xmit < 0)) {
1167             /* no data queued, try to write directly */
1168             status = COMM16_WriteFile(ptr->handle, lpvBuf, cbWrite - length);
1169             if (status > 0) {
1170               lpvBuf += status;
1171               length += status;
1172               continue;
1173             }
1174           }
1175           /* can't write directly, put into transmit buffer */
1176           status = ((ptr->obuf_tail > ptr->obuf_head) ?
1177                     (ptr->obuf_tail-1) : ptr->obuf_size) - ptr->obuf_head;
1178           if (!status) break;
1179           if ((cbWrite - length) < status)
1180             status = cbWrite - length;
1181           memcpy(lpvBuf, ptr->outbuf + ptr->obuf_head, status);
1182           ptr->obuf_head += status;
1183           if (ptr->obuf_head >= ptr->obuf_size)
1184             ptr->obuf_head = 0;
1185           lpvBuf += status;
1186           length += status;
1187           comm_waitwrite(ptr);
1188         }
1189
1190         ptr->commerror = 0;
1191         return length;
1192 }
1193
1194 /***********************************************************************
1195  *           EnableCommNotification   (USER.245)
1196  */
1197 BOOL16 WINAPI EnableCommNotification16( INT16 cid, HWND16 hwnd,
1198                                       INT16 cbWriteNotify, INT16 cbOutQueue )
1199 {
1200         struct DosDeviceStruct *ptr;
1201
1202         TRACE("(%d, %x, %d, %d)\n", cid, hwnd, cbWriteNotify, cbOutQueue);
1203         if ((ptr = GetDeviceStruct(cid)) == NULL) {
1204                 FIXME("no handle for cid = %0x!\n",cid);
1205                 return -1;
1206         }
1207         ptr->wnd = WIN_Handle32( hwnd );
1208         ptr->n_read = cbWriteNotify;
1209         ptr->n_write = cbOutQueue;
1210         return TRUE;
1211 }
1212