Usermode/Applications/irc_src/main.c

   1 /*
   2  * Acess2 IRC Client
   3  */
   4 #include <acess/sys.h>
   5 #include <stdlib.h>
   6 #include <stdio.h>
   7 #include <string.h>
   8 #include <net.h>
   9 #include <readline.h>
  10 #include <acess/devices/pty.h>
  11
  12 // === TYPES ===
  13 typedef struct sServer {
  14         struct sServer  *Next;
  15          int    FD;
  16         char    InBuf[BUFSIZ+1];
  17          int    ReadPos;
  18         char    Name[];
  19 } tServer;
  20
  21 typedef struct sMessage
  22 {
  23         struct sMessage *Next;
  24         time_t  Timestamp;
  25         tServer *Server;
  26          int    Type;
  27         char    *Source;        // Pointer into `Data`
  28         char    Data[];
  29 }       tMessage;
  30
  31 typedef struct sWindow
  32 {
  33         struct sWindow  *Next;
  34         tMessage        *Messages;
  35         tServer *Server;        //!< Canoical server (can be NULL)
  36          int    ActivityLevel;
  37         char    Name[]; // Channel name / remote user
  38 }       tWindow;
  39
  40 enum eMessageTypes
  41 {
  42         MSG_TYPE_NULL,
  43         MSG_TYPE_SERVER,        // Server message
  44
  45         MSG_TYPE_NOTICE,        // NOTICE command
  46         MSG_TYPE_JOIN,  // JOIN command
  47         MSG_TYPE_PART,  // PART command
  48         MSG_TYPE_QUIT,  // QUIT command
  49
  50         MSG_TYPE_STANDARD,      // Standard line
  51         MSG_TYPE_ACTION,        // /me
  52
  53         MSG_TYPE_UNK
  54 };
  55
  56 // === PROTOTYPES ===
  57  int    ParseArguments(int argc, const char *argv[]);
  58  int    ParseUserCommand(char *String);
  59 // ---
  60 tServer *Server_Connect(const char *Name, const char *AddressString, short PortNumber);
  61 tMessage        *Message_AppendF(tServer *Server, int Type, const char *Source, const char *Dest, const char *Message, ...);
  62 tMessage        *Message_Append(tServer *Server, int Type, const char *Source, const char *Dest, const char *Message);
  63 tWindow *Window_Create(tServer *Server, const char *Name);
  64 void    Redraw_Screen(void);
  65
  66  int    ProcessIncoming(tServer *Server);
  67 // --- Helpers
  68 void    SetCursorPos(int Row, int Col);
  69  int    writef(int FD, const char *Format, ...);
  70  int    OpenTCP(const char *AddressString, short PortNumber);
  71 char    *GetValue(char *Str, int *Ofs);
  72 static inline int       isdigit(int ch);
  73
  74 // === GLOBALS ===
  75 char    *gsUsername = "user";
  76 char    *gsHostname = "acess";
  77 char    *gsRealName = "Acess2 IRC Client";
  78 char    *gsNickname = "acess";
  79 tServer *gpServers;
  80 tWindow gWindow_Status = {
  81         NULL, NULL, NULL,       // No next, empty list, no server
  82         0, {""} // No activity, empty name (rendered as status)
  83 };
  84 tWindow *gpWindows = &gWindow_Status;
  85 tWindow *gpCurrentWindow = &gWindow_Status;
  86  int    giTerminal_Width = 80;
  87  int    giTerminal_Height = 25;
  88
  89 // ==== CODE ====
  90 void ExitHandler(void)
  91 {
  92         printf("\x1B[?1047l");
  93         printf("Quit\n");
  94 }
  95
  96 int main(int argc, const char *argv[], const char *envp[])
  97 {
  98          int    tmp;
  99         tReadline       *readline_info;
 100
 101         // Parse Command line
 102         if( (tmp = ParseArguments(argc, argv)) )        return tmp;
 103
 104         atexit(ExitHandler);
 105
 106         if( _SysIOCtl(1, DRV_IOCTL_TYPE, NULL) != DRV_TYPE_TERMINAL ) {
 107                 fprintf(stderr, "note: assuming 80x25, can't get terminal dimensions\n");
 108                 giTerminal_Width = 80;
 109                 giTerminal_Height = 25;
 110         }
 111         else {
 112                 struct ptydims  dims;
 113                 _SysIOCtl(1, PTY_IOCTL_GETDIMS, &dims);
 114                 giTerminal_Width = dims.W;
 115                 giTerminal_Height = dims.H;
 116         }
 117
 118         printf("\x1B[?1047h");
 119         printf("\x1B[%i;%ir", 0, giTerminal_Height-1);
 120
 121         SetCursorPos(giTerminal_Height-1, 0);
 122         printf("[(status)] ");
 123
 124         // HACK: Static server entry
 125         // UCC (University [of Western Australia] Computer Club) IRC Server
 126         gWindow_Status.Server = Server_Connect( "UCC", "130.95.13.18", 6667 );
 127         // Freenode (#osdev)
 128 //      gWindow_Status.Server = Server_Connect( "Freenode", "89.16.176.16", 6667 );
 129 //      gWindow_Status.Server = Server_Connect( "Host", "10.0.2.2", 6667 );
 130         // Local server
 131 //      gWindow_Status.Server = Server_Connect( "BitlBee", "192.168.1.39", 6667 );
 132
 133         if( !gWindow_Status.Server )
 134                 return -1;
 135
 136         SetCursorPos(giTerminal_Height-1, 0);
 137         printf("[(status)] ");
 138         fflush(stdout);
 139         readline_info = Readline_Init(1);
 140
 141         for( ;; )
 142         {
 143                 fd_set  readfds, errorfds;
 144                  int    rv, maxFD = 0;
 145                 tServer *srv;
 146
 147                 FD_ZERO(&readfds);
 148                 FD_ZERO(&errorfds);
 149                 FD_SET(0, &readfds);    // stdin
 150
 151                 fflush(stdout);
 152
 153                 // Fill server FDs in fd_set
 154                 for( srv = gpServers; srv; srv = srv->Next )
 155                 {
 156                         FD_SET(srv->FD, &readfds);
 157                         FD_SET(srv->FD, &errorfds);
 158                         if( srv->FD > maxFD )
 159                                 maxFD = srv->FD;
 160                 }
 161
 162                 rv = _SysSelect(maxFD+1, &readfds, 0, &errorfds, NULL, 0);
 163                 if( rv == -1 )  break;
 164
 165                 if(FD_ISSET(0, &readfds))
 166                 {
 167                         // User input
 168                         char    *cmd = Readline_NonBlock(readline_info);
 169                         if( cmd )
 170                         {
 171                                 if( cmd[0] )
 172                                 {
 173                                         ParseUserCommand(cmd);
 174                                 }
 175                                 free(cmd);
 176                                 // Prompt
 177                                 SetCursorPos(giTerminal_Height-1, 0);
 178                                 printf("\x1B[2K");      // Clear line
 179                                 if( gpCurrentWindow->Name[0] )
 180                                         printf("[%s:%s] ", gpCurrentWindow->Server->Name, gpCurrentWindow->Name);
 181                                 else
 182                                         printf("[(status)] ");
 183                         }
 184                 }
 185
 186                 // Server response
 187                 for( srv = gpServers; srv; srv = srv->Next )
 188                 {
 189                         if(FD_ISSET(srv->FD, &readfds))
 190                         {
 191                                 if( ProcessIncoming(srv) != 0 ) {
 192                                         // Oops, error
 193                                         break;
 194                                 }
 195                         }
 196
 197                         if(FD_ISSET(srv->FD, &errorfds))
 198                         {
 199                                 break;
 200                         }
 201                 }
 202
 203                 // Oops, an error
 204                 if( srv )       break;
 205         }
 206
 207         {
 208                 tServer *srv;
 209                 for( srv = gpServers; srv; srv = srv->Next )
 210                         _SysClose(srv->FD);
 211         }
 212         return 0;
 213 }
 214
 215 /**
 216  * \todo Actually implement correctly :)
 217  */
 218 int ParseArguments(int argc, const char *argv[])
 219 {
 220         return 0;
 221 }
 222
 223
 224 void Cmd_join(char *ArgString)
 225 {
 226          int    pos=0;
 227         char    *channel_name = GetValue(ArgString, &pos);
 228
 229         if( gpCurrentWindow->Server )
 230         {
 231                 writef(gpCurrentWindow->Server->FD, "JOIN :%s\n", channel_name);
 232         }
 233 }
 234
 235 void Cmd_quit(char *ArgString)
 236 {
 237         const char *quit_message = ArgString;
 238         if( quit_message == NULL || quit_message[0] == '\0' )
 239                 quit_message = "/quit - Acess2 IRC Client";
 240
 241         for( tServer *srv = gpServers; srv; srv = srv->Next )
 242         {
 243                 writef(srv->FD, "QUIT :%s\n", quit_message);
 244         }
 245
 246         exit(0);
 247 }
 248
 249 void Cmd_window(char *ArgString)
 250 {
 251          int    pos = 0;
 252         char    *window_id = GetValue(ArgString, &pos);
 253          int    window_num = atoi(window_id);
 254
 255         if( window_num > 0 )
 256         {
 257                 tWindow *win;
 258                 window_num --;  // Move to base 0
 259                 // Get `window_num`th window
 260                 for( win = gpWindows; win && window_num--; win = win->Next );
 261                 if( win ) {
 262                         gpCurrentWindow = win;
 263                         Redraw_Screen();
 264                 }
 265                 // Otherwise, silently ignore
 266         }
 267         else
 268         {
 269                 window_num = 1;
 270                 for( tWindow *win = gpWindows; win; win = win->Next, window_num ++ )
 271                 {
 272                         if( win->Name[0] ) {
 273                                 Message_AppendF(NULL, MSG_TYPE_SERVER, "client", "",
 274                                         "%i: %s/%s", window_num, win->Server->Name, win->Name);
 275                         }
 276                         else {
 277                                 Message_AppendF(NULL, MSG_TYPE_SERVER, "client", "",
 278                                         "%i: (status)", window_num);
 279                         }
 280                 }
 281         }
 282 }
 283
 284 const struct {
 285         const char *Name;
 286         void    (*Fcn)(char *ArgString);
 287 } caCommands[] = {
 288         {"join", Cmd_join},
 289         {"quit", Cmd_quit},
 290         {"window", Cmd_window},
 291         {"win",    Cmd_window},
 292         {"w",      Cmd_window},
 293 };
 294 const int ciNumCommands = sizeof(caCommands)/sizeof(caCommands[0]);
 295
 296 /**
 297  * \brief Handle a line from the prompt
 298  */
 299 int ParseUserCommand(char *String)
 300 {
 301         if( String[0] == '/' )
 302         {
 303                 char    *command;
 304                  int    pos = 0;
 305
 306                 command = GetValue(String, &pos)+1;
 307
 308                 // TODO: Prefix matches
 309                  int    cmdIdx = -1;
 310                 for( int i = 0; i < ciNumCommands; i ++ )
 311                 {
 312                         if( strcmp(command, caCommands[i].Name) == 0 ) {
 313                                 cmdIdx = i;
 314                                 break;
 315                         }
 316                 }
 317                 if( cmdIdx != -1 ) {
 318                         caCommands[cmdIdx].Fcn(String+pos);
 319                 }
 320                 else
 321                 {
 322                         Message_AppendF(NULL, MSG_TYPE_SERVER, "client", "", "Unknown command %s", command);
 323                 }
 324         }
 325         else
 326         {
 327                 // Message
 328                 // - Only send if server is valid and window name is non-empty
 329                 if( gpCurrentWindow->Server && gpCurrentWindow->Name[0] )
 330                 {
 331                         Message_Append(gpCurrentWindow->Server, MSG_TYPE_STANDARD,
 332                                 gsNickname, gpCurrentWindow->Name, String);
 333                         writef(gpCurrentWindow->Server->FD,
 334                                 "PRIVMSG %s :%s\n", gpCurrentWindow->Name,
 335                                 String
 336                                 );
 337                 }
 338         }
 339
 340         return 0;
 341 }
 342
 343 /**
 344  * \brief Connect to a server
 345  */
 346 tServer *Server_Connect(const char *Name, const char *AddressString, short PortNumber)
 347 {
 348         tServer *ret;
 349
 350         ret = calloc(1, sizeof(tServer) + strlen(Name) + 1);
 351
 352         strcpy(ret->Name, Name);
 353
 354         // Connect to the remove server
 355         ret->FD = OpenTCP( AddressString, PortNumber );
 356         if( ret->FD == -1 ) {
 357                 fprintf(stderr, "%s: Unable to create socket\n", Name);
 358                 return NULL;
 359         }
 360
 361         // Append to open list
 362         ret->Next = gpServers;
 363         gpServers = ret;
 364
 365         // Read some initial data
 366         Message_Append(NULL, MSG_TYPE_SERVER, Name, "", "Connection opened");
 367         ProcessIncoming(ret);
 368
 369         // Identify
 370         writef(ret->FD, "USER %s %s %s : %s\n", gsUsername, gsHostname, AddressString, gsRealName);
 371         writef(ret->FD, "NICK %s\n", gsNickname);
 372         Message_Append(NULL, MSG_TYPE_SERVER, Name, "", "Identified");
 373         //printf("%s: Identified\n", Name);
 374
 375         return ret;
 376 }
 377
 378 tMessage *Message_AppendF(tServer *Server, int Type, const char *Source, const char *Dest, const char *Message, ...)
 379 {
 380         va_list args;
 381          int    len;
 382         va_start(args, Message);
 383         len = vsnprintf(NULL, 0, Message, args);
 384         {
 385                 char    buf[len+1];
 386                 vsnprintf(buf, len+1, Message, args);
 387                 return Message_Append(Server, Type, Source, Dest, buf);
 388         }
 389 }
 390
 391 tMessage *Message_Append(tServer *Server, int Type, const char *Source, const char *Dest, const char *Message)
 392 {
 393         tWindow *win = NULL;
 394          int    msgLen = strlen(Message);
 395
 396         // Server==NULL indicates an internal message
 397         if( Server == NULL || Source[0] == '\0' )
 398         {
 399                 win = &gWindow_Status;
 400         }
 401         // Determine if it's a channel or PM
 402         else if( Dest[0] == '#' || Dest[0] == '&' )     // TODO: Better determining here
 403         {
 404                 for(win = gpWindows; win; win = win->Next)
 405                 {
 406                         if( win->Server == Server && strcmp(win->Name, Dest) == 0 )
 407                         {
 408                                 break;
 409                         }
 410                 }
 411                 if( !win ) {
 412                         win = Window_Create(Server, Dest);
 413                 }
 414         }
 415         #if 0
 416         else if( strcmp(Dest, Server->Nick) != 0 )
 417         {
 418                 // Umm... message for someone who isn't us?
 419                 win = &gWindow_Status;  // Stick it in the status window, just in case
 420         }
 421         #endif
 422         // Server message?
 423         else if( strchr(Source, '.') )  // TODO: And again, less hack please
 424         {
 425                 #if 1
 426                 for(win = gpWindows; win; win = win->Next)
 427                 {
 428                         if( win->Server == Server && strcmp(win->Name, Source) == 0 )
 429                         {
 430                                 break;
 431                         }
 432                 }
 433                 #endif
 434                 if( !win ) {
 435                         win = &gWindow_Status;
 436                 }
 437
 438                 // Set source to the server name (instead of the hostname)
 439                 Source = Server->Name;
 440         }
 441         // Private message
 442         else
 443         {
 444                 for(win = gpWindows; win; win = win->Next)
 445                 {
 446                         if( win->Server == Server && strcmp(win->Name, Source) == 0 )
 447                         {
 448                                 break;
 449                         }
 450                 }
 451                 if( !win ) {
 452                         win = Window_Create(Server, Dest);
 453                 }
 454         }
 455
 456         // Create message cache
 457         _SysDebug("Win (%s) msg: <%s> %s", win->Name, Source, Message);
 458         tMessage        *ret;
 459         ret = malloc( sizeof(tMessage) + msgLen + 1 + strlen(Source) + 1 );
 460         ret->Source = ret->Data + msgLen + 1;
 461         strcpy(ret->Source, Source);
 462         strcpy(ret->Data, Message);
 463         ret->Type = Type;
 464         ret->Server = Server;
 465
 466         // Append to window message list
 467         ret->Next = win->Messages;
 468         win->Messages = ret;
 469
 470         // Print now if current window
 471         if( win == gpCurrentWindow )
 472         {
 473                 printf("\x1b[s");
 474                 printf("\x1b""D");      // Scroll down 1 (free space below)
 475                 SetCursorPos(giTerminal_Height-2, 0);
 476                  int    prefixlen = strlen(Source) + 3;
 477                  int    avail = giTerminal_Width - prefixlen;
 478                  int    msglen = strlen(Message);
 479                 printf("[%s] %.*s", Source, avail, Message);
 480                 while( msglen > avail ) {
 481                         msglen -= avail;
 482                         Message += avail;
 483                         printf("\x1b""D");
 484                         SetCursorPos(giTerminal_Height-2, prefixlen);
 485                         printf("%.*s", avail, Message);
 486                 }
 487                 printf("\x1b[u");
 488         }
 489
 490         return ret;
 491 }
 492
 493 tWindow *Window_Create(tServer *Server, const char *Name)
 494 {
 495         tWindow *ret, *prev = NULL;
 496          int    num = 1;
 497
 498         // Get the end of the list
 499         // TODO: Cache this instead
 500         for( ret = gpCurrentWindow; ret; prev = ret, ret = ret->Next )
 501                 num ++;
 502
 503         ret = malloc(sizeof(tWindow) + strlen(Name) + 1);
 504         ret->Messages = NULL;
 505         ret->Server = Server;
 506         ret->ActivityLevel = 1;
 507         strcpy(ret->Name, Name);
 508
 509         if( prev ) {
 510                 ret->Next = prev->Next;
 511                 prev->Next = ret;
 512         }
 513         else {  // Shouldn't happen really
 514                 ret->Next = gpWindows;
 515                 gpWindows = ret;
 516         }
 517
 518 //      printf("Win %i %s:%s created\n", num, Server->Name, Name);
 519
 520         return ret;
 521 }
 522
 523 void Redraw_Screen(void)
 524 {
 525          int    y = 0;
 526         tMessage        *msg;
 527
 528         printf("\x1B[2J");      // Clear screen
 529         printf("\x1B[0;0H");    // Reset cursor
 530
 531         msg = gpCurrentWindow->Messages;
 532
 533         // TODO: Title bar?
 534
 535         // Note: This renders from the bottom up
 536         for( y = giTerminal_Height - 1; y -- && msg; msg = msg->Next)
 537         {
 538                  int    msglen = strlen(msg->Data);
 539                  int    prefix_len = 3 + strlen(msg->Source);
 540                  int    line_avail = giTerminal_Width - prefix_len;
 541                  int    i = 0, done = 0;
 542
 543                 y -= msglen / line_avail;       // Extra lines (y-- above handles the 1 line case)
 544                 SetCursorPos(y, 0);
 545                 printf("[%s] ", msg->Source);
 546
 547                 while(done < msglen) {
 548                         done += printf("%.*s", line_avail, msg->Data+done);
 549                         i ++;
 550                         SetCursorPos(y+i, prefix_len);
 551                 }
 552         }
 553
 554         // Bottom line is rendered by the prompt
 555 }
 556
 557 void Cmd_PRIVMSG(tServer *Server, const char *Dest, const char *Src, const char *Message)
 558 {
 559         Message_Append(Server, MSG_TYPE_STANDARD, Dest, Src, Message);
 560         //printf("<%s:%s:%s> %s\n", Server->Name, Dest, Src, Message);
 561 }
 562
 563 /**
 564  */
 565 void ParseServerLine(tServer *Server, char *Line)
 566 {
 567          int    pos = 0;
 568         char    *ident, *cmd;
 569
 570 //      _SysDebug("[%s] %s", Server->Name, Line);
 571
 572         // Message?
 573         if( *Line == ':' )
 574         {
 575                 pos ++;
 576                 ident = GetValue(Line, &pos);   // Ident (user or server)
 577                 cmd = GetValue(Line, &pos);
 578
 579                 // Numeric command
 580                 if( isdigit(cmd[0]) && isdigit(cmd[1]) && isdigit(cmd[2]) )
 581                 {
 582                         char    *user, *message;
 583                          int    num;
 584                         num  = (cmd[0] - '0') * 100;
 585                         num += (cmd[1] - '0') * 10;
 586                         num += (cmd[2] - '0') * 1;
 587
 588                         user = GetValue(Line, &pos);
 589
 590                         if( Line[pos] == ':' ) {
 591                                 message = Line + pos + 1;
 592                         }
 593                         else {
 594                                 message = GetValue(Line, &pos);
 595                         }
 596
 597                         switch(num)
 598                         {
 599                         case 332:       // Topic
 600                                 user = message; // Channel
 601                                 message = Line + pos + 1;       // Topic
 602                                 Message_AppendF(Server, MSG_TYPE_SERVER, user, user, "Topic: %s", message);
 603                                 break;
 604                         case 333:       // Topic set by
 605                                 user = message; // Channel
 606                                 message = GetValue(Line, &pos); // User
 607                                 GetValue(Line, &pos);   // Timestamp
 608                                 Message_AppendF(Server, MSG_TYPE_SERVER, user, user, "Set by %s", message);
 609                                 break;
 610                         case 353:       // /NAMES list
 611                                 // <user> = <channel> :list
 612                                 // '=' was eaten in and set to message
 613                                 user = GetValue(Line, &pos);    // Actually channel
 614                                 message = Line + pos + 1;       // List
 615                                 Message_AppendF(Server, MSG_TYPE_SERVER, user, user, "Names: %s", message);
 616                                 break;
 617                         case 366:       // end of /NAMES list
 618                                 // <user> <channel> :msg
 619                                 user = message;
 620                                 message = Line + pos + 1;
 621                                 Message_Append(Server, MSG_TYPE_SERVER, user, user, message);
 622                                 break;
 623                         case 372:       // MOTD Data
 624                         case 375:       // MOTD Start
 625                         case 376:       // MOTD End
 626
 627                         default:
 628                                 //printf("[%s] %i %s\n", Server->Name, num, message);
 629                                 Message_Append(Server, MSG_TYPE_SERVER, ident, user, message);
 630                                 break;
 631                         }
 632                 }
 633                 else if( strcmp(cmd, "NOTICE") == 0 )
 634                 {
 635                         char    *class, *message;
 636
 637                         class = GetValue(Line, &pos);
 638                         _SysDebug("NOTICE class='%s'", class);
 639
 640                         if( Line[pos] == ':' ) {
 641                                 message = Line + pos + 1;
 642                         }
 643                         else {
 644                                 message = GetValue(Line, &pos);
 645                         }
 646
 647                         //printf("[%s] NOTICE %s: %s\n", Server->Name, ident, message);
 648                         char *ident_bang = strchr(ident, '!');
 649                         if( ident_bang ) {
 650                                 *ident_bang = '\0';
 651                         }
 652                         Message_Append(Server, MSG_TYPE_NOTICE, ident, "", message);
 653                 }
 654                 else if( strcmp(cmd, "PRIVMSG") == 0 )
 655                 {
 656                         char    *dest, *message;
 657                         dest = GetValue(Line, &pos);
 658
 659                         if( Line[pos] == ':' ) {
 660                                 message = Line + pos + 1;
 661                         }
 662                         else {
 663                                 message = GetValue(Line, &pos);
 664                         }
 665
 666                         // TODO: Catch when the privmsg is addressed to the user
 667
 668 //                      Cmd_PRIVMSG(Server, dest, ident, message);
 669                         char *ident_bang = strchr(ident, '!');
 670                         if( ident_bang ) {
 671                                 *ident_bang = '\0';
 672                         }
 673                         Message_Append(Server, MSG_TYPE_STANDARD, ident, dest, message);
 674                 }
 675                 else if( strcmp(cmd, "JOIN" ) == 0 )
 676                 {
 677                         char    *channel;
 678                         channel = Line + pos + 1;
 679                         Window_Create(Server, channel);
 680                 }
 681                 else
 682                 {
 683                         Message_AppendF(Server, MSG_TYPE_SERVER, "", "", "Unknown message %s (%s)", cmd, Line+pos);
 684                 }
 685         }
 686         else {
 687                 cmd = GetValue(Line, &pos);
 688
 689                 if( strcmp(cmd, "PING") == 0 ) {
 690                         writef(Server->FD, "PONG %s\n", gsHostname);
 691
 692                 }
 693                 else {
 694                         // Command to client
 695                         Message_AppendF(NULL, MSG_TYPE_UNK, "", "", "Client Command: %s", Line);
 696                 }
 697         }
 698 }
 699
 700 /**
 701  * \brief Process incoming lines from the server
 702  */
 703 int ProcessIncoming(tServer *Server)
 704 {
 705         char    *ptr, *newline;
 706          int    len;
 707
 708         // While there is data in the buffer, read it into user memory and
 709         // process it line by line
 710         // ioctl#8 on a TCP client gets the number of bytes in the recieve buffer
 711         // - Used to avoid blocking
 712         #if NON_BLOCK_READ
 713         while( (len = _SysIOCtl(Server->FD, 8, NULL)) > 0 )
 714         {
 715         #endif
 716                 // Read data
 717                 len = _SysRead(Server->FD, &Server->InBuf[Server->ReadPos], BUFSIZ - Server->ReadPos);
 718                 if( len == -1 ) {
 719                         return -1;
 720                 }
 721                 Server->InBuf[Server->ReadPos + len] = '\0';
 722
 723                 // Break into lines
 724                 ptr = Server->InBuf;
 725                 while( (newline = strchr(ptr, '\n')) )
 726                 {
 727                         *newline = '\0';
 728                         if( newline[-1] == '\r' )       newline[-1] = '\0';
 729                         ParseServerLine(Server, ptr);
 730                         ptr = newline + 1;
 731                 }
 732
 733                 // Handle incomplete lines
 734                 if( ptr - Server->InBuf < len + Server->ReadPos ) {
 735                         // Update the read position
 736                         // InBuf ReadPos    ptr          ReadPos+len
 737                         // | old | new used | new unused |
 738                         Server->ReadPos = len + Server->ReadPos - (ptr - Server->InBuf);
 739                         // Copy stuff back (moving "new unused" to the start of the buffer)
 740                         memcpy(Server->InBuf, ptr, Server->ReadPos);
 741                 }
 742                 else {
 743                         Server->ReadPos = 0;
 744                 }
 745         #if NON_BLOCK_READ
 746         }
 747         #endif
 748
 749         return 0;
 750 }
 751
 752 /**
 753  * \brief Write a formatted string to a file descriptor
 754  *
 755  */
 756 int writef(int FD, const char *Format, ...)
 757 {
 758         va_list args;
 759          int    len;
 760
 761         va_start(args, Format);
 762         len = vsnprintf(NULL, 0, Format, args);
 763         va_end(args);
 764
 765         {
 766                 char    buf[len+1];
 767                 va_start(args, Format);
 768                 vsnprintf(buf, len+1, Format, args);
 769                 va_end(args);
 770
 771                 return _SysWrite(FD, buf, len);
 772         }
 773 }
 774
 775 /**
 776  * \brief Initialise a TCP connection to \a AddressString on port \a PortNumber
 777  */
 778 int OpenTCP(const char *AddressString, short PortNumber)
 779 {
 780          int    fd, addrType;
 781         char    addrBuffer[8];
 782
 783         // Parse IP Address
 784         addrType = Net_ParseAddress(AddressString, addrBuffer);
 785         if( addrType == 0 ) {
 786                 fprintf(stderr, "Unable to parse '%s' as an IP address\n", AddressString);
 787                 _SysDebug("Unable to parse '%s' as an IP address\n", AddressString);
 788                 return -1;
 789         }
 790
 791         // Finds the interface for the destination address
 792         fd = Net_OpenSocket(addrType, addrBuffer, "tcpc");
 793         if( fd == -1 ) {
 794                 fprintf(stderr, "Unable to open TCP Client to '%s'\n", AddressString);
 795                 _SysDebug("Unable to open TCP client to '%s'\n", AddressString);
 796                 return -1;
 797         }
 798
 799         // Set remote port and address
 800 //      printf("Setting port and remote address\n");
 801         _SysIOCtl(fd, 5, &PortNumber);
 802         _SysIOCtl(fd, 6, addrBuffer);
 803
 804         // Connect
 805 //      printf("Initiating connection\n");
 806         if( _SysIOCtl(fd, 7, NULL) == 0 ) {
 807                 // Shouldn't happen :(
 808                 fprintf(stderr, "Unable to start connection\n");
 809                 return -1;
 810         }
 811
 812         // Return descriptor
 813         return fd;
 814 }
 815
 816 /**
 817  * \brief Read a space-separated value from a string
 818  */
 819 char *GetValue(char *Src, int *Ofs)
 820 {
 821          int    pos = *Ofs;
 822         char    *ret = Src + pos;
 823         char    *end;
 824
 825         if( !Src )      return NULL;
 826
 827         while( *ret == ' ' )    ret ++;
 828
 829         end = strchr(ret, ' ');
 830         if( end ) {
 831                 *end = '\0';
 832         }
 833         else {
 834                 end = ret + strlen(ret) - 1;
 835         }
 836
 837         end ++ ;
 838         while( *ret == ' ' )    end ++;
 839         *Ofs = end - Src;
 840
 841         return ret;
 842 }
 843
 844 void SetCursorPos(int Row, int Col)
 845 {
 846         printf("\x1B[%i;%iH", Row, Col);
 847 }
 848
 849 static inline int isdigit(int ch)
 850 {
 851         return '0' <= ch && ch < '9';
 852 }