workbench/classes/zune/nlist/nlisttree_mcc/ClipboardServer.c

   1 /***************************************************************************
   2
   3  NList.mcc - New List MUI Custom Class
   4  Registered MUI class, Serial Number: 1d51 0x9d510030 to 0x9d5100A0
   5                                            0x9d5100C0 to 0x9d5100FF
   6
   7  Copyright (C) 2017 The AROS Dev Team
   8  Copyright (C) 1996-2001 by Gilles Masson
   9  Copyright (C) 2001-2014 NList Open Source Team
  10
  11  This library is free software; you can redistribute it and/or
  12  modify it under the terms of the GNU Lesser General Public
  13  License as published by the Free Software Foundation; either
  14  version 2.1 of the License, or (at your option) any later version.
  15
  16  This library is distributed in the hope that it will be useful,
  17  but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19  Lesser General Public License for more details.
  20
  21  NList classes Support Site:  http://www.sf.net/projects/nlist-classes
  22
  23  $Id$
  24
  25 ***************************************************************************/
  26
  27 #include <string.h>
  28 #include <stdlib.h>
  29
  30 #include <proto/dos.h>
  31 #include <proto/exec.h>
  32 #include <proto/intuition.h>
  33 #include <proto/keymap.h>
  34 #include <proto/locale.h>
  35
  36 #include <dos/dostags.h>
  37 #include <mui/NList_mcc.h>
  38
  39 // for iffparse.library no global variable definitions are needed
  40 #define __NOLIBBASE__
  41 #define __NOGLOBALIFACE__
  42 #include <proto/iffparse.h>
  43
  44 #include "private.h"
  45
  46 #include "Debug.h"
  47
  48 static struct Library *IFFParseBase = NULL;
  49 #if defined(__amigaos4__)
  50 static struct IFFParseIFace *IIFFParse = NULL;
  51 #endif
  52 static struct SignalSemaphore *serverLock = NULL;
  53 static struct Process *serverProcess = NULL;
  54 static struct MsgPort *serverPort = NULL;
  55 static struct MsgPort replyPort;
  56 static struct Message msg;
  57
  58 struct ServerData
  59 {
  60   ULONG sd_Command;
  61   ULONG sd_Unit;
  62   STRPTR sd_String;
  63   LONG sd_Result;
  64 };
  65
  66 #define SERVER_SHUTDOWN   0xdeadf00d
  67 #define SERVER_WRITE      0x00000001
  68
  69 #define ID_FORM    MAKE_ID('F','O','R','M')
  70 #define ID_FTXT    MAKE_ID('F','T','X','T')
  71 #define ID_CHRS    MAKE_ID('C','H','R','S')
  72
  73 /// StringToClipboard
  74 // copy a string to the clipboard, public callable function
  75 LONG StringToClipboard(ULONG unit, STRPTR str)
  76 {
  77   LONG result = MUIV_NLCT_Failed;
  78
  79   // lock out other tasks
  80   if(AttemptSemaphore(serverLock))
  81   {
  82     if(str != NULL && strlen(str) > 0)
  83     {
  84       struct ServerData sd;
  85
  86       // set up the data packet
  87       sd.sd_Command = SERVER_WRITE;
  88       sd.sd_Unit = unit;
  89       sd.sd_String = str;
  90
  91       // set up the message, send it and wait for a reply
  92       msg.mn_Node.ln_Name = (STRPTR)&sd;
  93       replyPort.mp_SigTask = FindTask(NULL);
  94
  95       PutMsg(serverPort, &msg);
  96       Remove((struct Node *)WaitPort(&replyPort));
  97
  98       result = sd.sd_Result;
  99     }
 100     else
 101       DisplayBeep(0);
 102
 103     // allow other tasks again
 104     ReleaseSemaphore(serverLock);
 105   }
 106   else
 107     DisplayBeep(0);
 108
 109   return result;
 110 }
 111
 112 ///
 113 /// WriteToClipboard
 114 // write a given string via iffparse.library to the clipboard
 115 // non-public server side function
 116 static LONG WriteToClipboard(ULONG unit, STRPTR str)
 117 {
 118   LONG result = MUIV_NLCT_Failed;
 119   struct IFFHandle *iff;
 120
 121   if((iff = AllocIFF()) != NULL)
 122   {
 123     if((iff->iff_Stream = (IPTR)OpenClipboard(unit)) != 0)
 124     {
 125       InitIFFasClip(iff);
 126
 127       if(OpenIFF(iff, IFFF_WRITE) == 0)
 128       {
 129         LONG size = strlen(str);
 130
 131         PushChunk(iff, ID_FTXT, ID_FORM, IFFSIZE_UNKNOWN);
 132         PushChunk(iff, 0, ID_CHRS, IFFSIZE_UNKNOWN);
 133         if(WriteChunkBytes(iff, str, size) == size)
 134           result = MUIV_NLCT_Success;
 135         else
 136           result = MUIV_NLCT_WriteErr;
 137         PopChunk(iff);
 138         PopChunk(iff);
 139
 140         CloseIFF(iff);
 141       }
 142
 143       CloseClipboard((struct ClipboardHandle *)iff->iff_Stream);
 144     }
 145
 146     FreeIFF(iff);
 147   }
 148
 149   return result;
 150 }
 151
 152 ///
 153 /// ClipboardServer
 154 // the clipboard server process
 155 #if defined(__amigaos4__)
 156 static LONG ClipboardServer(UNUSED STRPTR args, UNUSED LONG length, struct ExecBase *SysBase)
 157 #else
 158 static SAVEDS ASM LONG ClipboardServer(UNUSED REG(a0, STRPTR args), UNUSED REG(d0, LONG length))
 159 #endif
 160 {
 161   struct Process *me;
 162   struct Message *msg;
 163   #if defined(__amigaos4__)
 164   struct ExecIFace *IExec = (struct ExecIFace *)SysBase->MainInterface;
 165   #endif
 166
 167   ENTER();
 168
 169   D(DBF_CLIPBOARD, "clipboard server starting up");
 170
 171   me = (struct Process *)FindTask(NULL);
 172   WaitPort(&me->pr_MsgPort);
 173   msg = GetMsg(&me->pr_MsgPort);
 174
 175   if((IFFParseBase = OpenLibrary("iffparse.library", 36)) != NULL)
 176   {
 177     #if defined(__amigaos4__)
 178
 179     if((IIFFParse = (struct IFFParseIFace *)GetInterface(IFFParseBase, "main", 1, NULL)) != NULL)
 180     {
 181     #endif
 182     struct MsgPort *mp;
 183
 184     #if defined(__amigaos4__)
 185     mp = AllocSysObjectTags(ASOT_PORT, TAG_DONE);
 186     #else
 187     mp = CreateMsgPort();
 188     #endif
 189     if(mp != NULL)
 190     {
 191       BOOL running = TRUE;
 192
 193       // return something as a valid reply
 194       msg->mn_Node.ln_Name = (STRPTR)mp;
 195       ReplyMsg(msg);
 196
 197       D(DBF_CLIPBOARD, "clipboard server main loop");
 198       do
 199       {
 200         WaitPort(mp);
 201
 202         while((msg = GetMsg(mp)) != NULL)
 203         {
 204           struct ServerData *sd = (struct ServerData *)msg->mn_Node.ln_Name;
 205
 206           switch(sd->sd_Command)
 207           {
 208             case SERVER_SHUTDOWN:
 209             {
 210               running = FALSE;
 211             }
 212             break;
 213
 214             case SERVER_WRITE:
 215             {
 216               sd->sd_Result = WriteToClipboard(sd->sd_Unit, sd->sd_String);
 217             }
 218             break;
 219           }
 220
 221           ReplyMsg(msg);
 222         }
 223       }
 224       while(running == TRUE);
 225
 226       #if defined(__amigaos4__)
 227       FreeSysObject(ASOT_PORT, mp);
 228       #else
 229       DeleteMsgPort(mp);
 230       #endif
 231     }
 232
 233     #if defined(__amigaos4__)
 234     DropInterface((struct Interface *)IIFFParse);
 235     }
 236     #endif
 237
 238     CloseLibrary(IFFParseBase);
 239   }
 240
 241   D(DBF_CLIPBOARD, "clipboard server shutting down");
 242
 243   Forbid();
 244
 245   LEAVE();
 246   return 0;
 247 }
 248
 249 ///
 250 /// StartClipboardServer
 251 // launch the clipboard server process
 252 // we must use a separate process, because accessing the clipboard via iffparse.library
 253 // allocates 2 signals for every instance of this class. Hence we will run out of signals
 254 // sooner or later. The separate process avoids this situation.
 255 BOOL StartClipboardServer(void)
 256 {
 257   BOOL success = FALSE;
 258
 259   ENTER();
 260
 261   // create a semaphore to protect several concurrent tasks
 262   #if defined(__amigaos4__)
 263   serverLock = AllocSysObjectTags(ASOT_SEMAPHORE, TAG_DONE);
 264   #else
 265   serverLock = AllocVecShared(sizeof(*serverLock), MEMF_CLEAR);
 266   #endif
 267   if(serverLock != NULL)
 268   {
 269     #if defined(__amigaos4__)
 270     uint32 oldStackSize;
 271     #else
 272     InitSemaphore(serverLock);
 273     #endif
 274
 275     #if defined(__amigaos4__)
 276     // set a minimum stack size of 8K, no matter what the user has set
 277     DosControlTags(DC_MinProcStackR, &oldStackSize,
 278                    DC_MinProcStackW, 8192,
 279                    TAG_DONE);
 280     #endif
 281
 282     // create the server process
 283     // this must *NOT* be a child process
 284     serverProcess = CreateNewProcTags(NP_Entry, ClipboardServer,
 285                                       NP_Name, "NListtree.mcc clipboard server",
 286                                       NP_Priority, 1,
 287                                       NP_StackSize, 8192,
 288                                       NP_WindowPtr, ~0L,
 289                                       #if defined(__amigaos4__)
 290                                       NP_Child, FALSE,
 291                                       #elif defined(__MORPHOS__)
 292                                       NP_CodeType, CODETYPE_PPC,
 293                                       #endif
 294                                       TAG_DONE);
 295     if(serverProcess !=  NULL)
 296     {
 297       // we use one global reply port with a static signal bit
 298       memset( &replyPort, 0, sizeof( replyPort ) );
 299       replyPort.mp_Node.ln_Type = NT_MSGPORT;
 300       replyPort.mp_SigBit = SIGB_SINGLE;
 301       replyPort.mp_SigTask = FindTask(NULL);
 302       NewList(&replyPort.mp_MsgList);
 303
 304       msg.mn_ReplyPort = &replyPort;
 305       msg.mn_Node.ln_Name = (STRPTR)NULL;
 306
 307       // send out the startup message and wait for a reply
 308       PutMsg(&serverProcess->pr_MsgPort, &msg);
 309       Remove((struct Node *)WaitPort(&replyPort));
 310
 311       // check whether everything went ok
 312       if((serverPort = (struct MsgPort *)msg.mn_Node.ln_Name) != NULL)
 313       {
 314         success = TRUE;
 315       }
 316     }
 317
 318     #if defined(__amigaos4__)
 319     // restore the old minimum stack size
 320     DosControlTags(DC_MinProcStackW, oldStackSize,
 321                    TAG_DONE);
 322     #endif
 323   }
 324
 325   RETURN(success);
 326   return success;
 327 }
 328
 329 ///
 330 /// ShutdownClipboardServer
 331 // shutdown the server process and clean up
 332 void ShutdownClipboardServer(void)
 333 {
 334   if(serverPort != NULL)
 335   {
 336     struct ServerData sd;
 337
 338     sd.sd_Command = SERVER_SHUTDOWN;
 339
 340     msg.mn_Node.ln_Name = (STRPTR)&sd;
 341     replyPort.mp_SigTask = FindTask(NULL);
 342
 343     PutMsg(serverPort, &msg);
 344     WaitPort(&replyPort);
 345
 346     serverPort = NULL;
 347   }
 348
 349   if(serverLock != NULL)
 350   {
 351     #if defined(__amigaos4__)
 352     FreeSysObject(ASOT_SEMAPHORE, serverLock);
 353     #else
 354     FreeVec(serverLock);
 355     #endif
 356
 357     serverLock = NULL;
 358   }
 359 }
 360
 361 ///
 362