Usermode/Applications/CLIShell_src/main.c

   1 /*\r
   2  * AcessOS Shell Version 3\r
   3  */\r
   4 #define USE_READLINE    1\r
   5 #include <acess/sys.h>\r
   6 #include <stdlib.h>\r
   7 #include <stdio.h>\r
   8 #include <string.h>\r
   9 #include "header.h"\r
  10 \r
  11 #if USE_READLINE\r
  12 # include "readline.h"\r
  13 #endif\r
  14 \r
  15 #define _stdin  0\r
  16 #define _stdout 1\r
  17 #define _stderr 2\r
  18 \r
  19 // ==== PROTOTYPES ====\r
  20 char    *ReadCommandLine(int *Length);\r
  21 void    Parse_Args(char *str, char **dest);\r
  22 void    CallCommand(char **Args);\r
  23 void    Command_Logout(int argc, char **argv);\r
  24 void    Command_Clear(int argc, char **argv);\r
  25 void    Command_Help(int argc, char **argv);\r
  26 void    Command_Cd(int argc, char **argv);\r
  27 void    Command_Dir(int argc, char **argv);\r
  28 \r
  29 // ==== CONSTANT GLOBALS ====\r
  30 struct  {\r
  31         char    *name;\r
  32         void    (*fcn)(int argc, char **argv);\r
  33 }       cBUILTINS[] = {\r
  34         {"exit", Command_Logout},       {"logout", Command_Logout},\r
  35         {"help", Command_Help}, {"clear", Command_Clear},\r
  36         {"cd", Command_Cd}, {"dir", Command_Dir}\r
  37 };\r
  38 static char     *cDEFAULT_PATH[] = {"/Acess/Bin"};\r
  39 #define BUILTIN_COUNT   (sizeof(cBUILTINS)/sizeof(cBUILTINS[0]))\r
  40 \r
  41 // ==== LOCAL VARIABLES ====\r
  42  int    giNumPathDirs = 1;\r
  43 char    **gasPathDirs = cDEFAULT_PATH;\r
  44 char    **gasEnvironment;\r
  45 char    gsCommandBuffer[1024];\r
  46 char    *gsCurrentDirectory = NULL;\r
  47 char    **gasCommandHistory;\r
  48  int    giLastCommand = 0;\r
  49  int    giCommandSpace = 0;\r
  50 \r
  51 // ==== CODE ====\r
  52 int main(int argc, char *argv[], char *envp[])\r
  53 {\r
  54         char    *sCommandStr;\r
  55         char    *saArgs[32] = {0};\r
  56          int    length = 0;\r
  57          int    i;\r
  58          int    iArgCount = 0;\r
  59         #if !USE_READLINE\r
  60          int    bCached = 1;\r
  61         #else\r
  62         tReadline       *readline_state = Readline_Init(1);\r
  63         #endif\r
  64         \r
  65         gasEnvironment = envp;\r
  66         \r
  67         Command_Clear(0, NULL);\r
  68         \r
  69         {\r
  70                 char    *tmp = getenv("CWD");\r
  71                 if(tmp) {\r
  72                         gsCurrentDirectory = malloc(strlen(tmp)+1);\r
  73                         strcpy(gsCurrentDirectory, tmp);\r
  74                 } else {\r
  75                         gsCurrentDirectory = malloc(2);\r
  76                         strcpy(gsCurrentDirectory, "/");\r
  77                 }\r
  78         }       \r
  79         \r
  80         write(_stdout, 22, "Acess Shell Version 3\n");\r
  81         write(_stdout,  2, "\n");\r
  82         for(;;)\r
  83         {\r
  84                 // Free last command & arguments\r
  85                 if(saArgs[0])   free(saArgs);\r
  86                 #if !USE_READLINE\r
  87                 if(!bCached)    free(sCommandStr);\r
  88                 bCached = 0;\r
  89                 #endif\r
  90                 \r
  91                 write(_stdout, strlen(gsCurrentDirectory), gsCurrentDirectory);\r
  92                 write(_stdout, 2, "$ ");\r
  93                 \r
  94                 // Read Command line\r
  95                 #if USE_READLINE\r
  96                 sCommandStr = Readline( readline_state );\r
  97                 printf("\n");\r
  98                 length = strlen(sCommandStr);\r
  99                 #else\r
 100                 sCommandStr = ReadCommandLine( &length );\r
 101                 \r
 102                 if(!sCommandStr) {\r
 103                         write(_stdout, 25, "PANIC: Out of heap space\n");\r
 104                         return -1;\r
 105                 }\r
 106                 \r
 107                 // Check if the command should be cached\r
 108                 if(gasCommandHistory == NULL || strcmp(sCommandStr, gasCommandHistory[giLastCommand]) != 0)\r
 109                 {\r
 110                         if(giLastCommand >= giCommandSpace) {\r
 111                                 giCommandSpace += 12;\r
 112                                 gasCommandHistory = realloc(gasCommandHistory, giCommandSpace*sizeof(char*));\r
 113                         }\r
 114                         giLastCommand ++;\r
 115                         gasCommandHistory[ giLastCommand ] = sCommandStr;\r
 116                         bCached = 1;\r
 117                 }\r
 118                 #endif\r
 119                 \r
 120                 // Parse Command Line into arguments\r
 121                 Parse_Args(sCommandStr, saArgs);\r
 122                 \r
 123                 // Count Arguments\r
 124                 iArgCount = 0;\r
 125                 while(saArgs[iArgCount])        iArgCount++;\r
 126                 \r
 127                 // Silently Ignore all empty commands\r
 128                 if(saArgs[1][0] == '\0')        continue;\r
 129                 \r
 130                 // Check Built-In Commands\r
 131                 for( i = 0; i < BUILTIN_COUNT; i++ )\r
 132                 {\r
 133                         if( strcmp(saArgs[1], cBUILTINS[i].name) == 0 )\r
 134                         {\r
 135                                 cBUILTINS[i].fcn(iArgCount-1, &saArgs[1]);\r
 136                                 break;\r
 137                         }\r
 138                 }\r
 139                 if(i != BUILTIN_COUNT)  continue;\r
 140                 \r
 141                 // Shall we?\r
 142                 CallCommand( &saArgs[1] );\r
 143                 \r
 144                 #if USE_READLINE\r
 145                 free( sCommandStr );\r
 146                 #endif\r
 147         }\r
 148 }\r
 149 \r
 150 /**\r
 151  * \fn char *ReadCommandLine(int *Length)\r
 152  * \brief Read from the command line\r
 153  */\r
 154 char *ReadCommandLine(int *Length)\r
 155 {\r
 156         char    *ret;\r
 157          int    len, pos, space = 1023;\r
 158         char    ch;\r
 159         #if 0\r
 160          int    scrollbackPos = giLastCommand;\r
 161         #endif\r
 162          \r
 163         // Preset Variables\r
 164         ret = malloc( space+1 );\r
 165         if(!ret)        return NULL;\r
 166         len = 0;        pos = 0;\r
 167                 \r
 168         // Read In Command Line\r
 169         do {\r
 170                 read(_stdin, 1, &ch);   // Read Character from stdin (read is a blocking call)\r
 171                 \r
 172                 if(ch == '\n')  break;\r
 173                 \r
 174                 switch(ch)\r
 175                 {\r
 176                 // Control characters\r
 177                 case '\x1B':\r
 178                         read(_stdin, 1, &ch);   // Read control character\r
 179                         switch(ch)\r
 180                         {\r
 181                         //case 'D':     if(pos) pos--;  break;\r
 182                         //case 'C':     if(pos<len)     pos++;  break;\r
 183                         case '[':\r
 184                                 read(_stdin, 1, &ch);   // Read control character\r
 185                                 switch(ch)\r
 186                                 {\r
 187                                 #if 0\r
 188                                 case 'A':       // Up\r
 189                                         {\r
 190                                                  int    oldLen = len;\r
 191                                                 if( scrollbackPos > 0 ) break;\r
 192                                                 \r
 193                                                 free(ret);\r
 194                                                 ret = strdup( gasCommandHistory[--scrollbackPos] );\r
 195                                                 \r
 196                                                 len = strlen(ret);\r
 197                                                 while(pos--)    write(_stdout, 3, "\x1B[D");\r
 198                                                 write(_stdout, len, ret);       pos = len;\r
 199                                                 while(pos++ < oldLen)   write(_stdout, 1, " ");\r
 200                                         }\r
 201                                         break;\r
 202                                 case 'B':       // Down\r
 203                                         {\r
 204                                                  int    oldLen = len;\r
 205                                                 if( scrollbackPos < giLastCommand-1 )   break;\r
 206                                                 \r
 207                                                 free(ret);\r
 208                                                 ret = strdup( gasCommandHistory[++scrollbackPos] );\r
 209                                                 \r
 210                                                 len = strlen(ret);\r
 211                                                 while(pos--)    write(_stdout, 3, "\x1B[D");\r
 212                                                 write(_stdout, len, ret);       pos = len;\r
 213                                                 while(pos++ < oldLen)   write(_stdout, 1, " ");\r
 214                                         }\r
 215                                         break;\r
 216                                 #endif\r
 217                                 case 'D':       // Left\r
 218                                         if(pos == 0)    break;\r
 219                                         pos --;\r
 220                                         write(_stdout, 3, "\x1B[D");\r
 221                                         break;\r
 222                                 case 'C':       // Right\r
 223                                         if(pos == len)  break;\r
 224                                         pos++;\r
 225                                         write(_stdout, 3, "\x1B[C");\r
 226                                         break;\r
 227                                 }\r
 228                         }\r
 229                         break;\r
 230                 \r
 231                 // Backspace\r
 232                 case '\b':\r
 233                         if(len <= 0)            break;  // Protect against underflows\r
 234                         write(_stdout, 1, &ch);\r
 235                         if(pos == len) {        // Simple case of end of string\r
 236                                 len --;\r
 237                                 pos--;\r
 238                         }\r
 239                         else {\r
 240                                 char    buf[7] = "\x1B[000D";\r
 241                                 buf[2] += ((len-pos+1)/100) % 10;\r
 242                                 buf[3] += ((len-pos+1)/10) % 10;\r
 243                                 buf[4] += (len-pos+1) % 10;\r
 244                                 write(_stdout, len-pos, &ret[pos]);     // Move Text\r
 245                                 ch = ' ';       write(_stdout, 1, &ch); ch = '\b';      // Clear deleted character\r
 246                                 write(_stdout, 7, buf); // Update Cursor\r
 247                                 // Alter Buffer\r
 248                                 memmove(&ret[pos-1], &ret[pos], len-pos);\r
 249                                 pos --;\r
 250                                 len --;\r
 251                         }\r
 252                         break;\r
 253                 \r
 254                 // Tab\r
 255                 case '\t':\r
 256                         //TODO: Implement Tab-Completion\r
 257                         //Currently just ignore tabs\r
 258                         break;\r
 259                 \r
 260                 default:                \r
 261                         // Expand Buffer\r
 262                         if(len+1 > space) {\r
 263                                 space += 256;\r
 264                                 ret = realloc(ret, space+1);\r
 265                                 if(!ret)        return NULL;\r
 266                         }\r
 267                         \r
 268                         // Editing inside the buffer\r
 269                         if(pos != len) {\r
 270                                 char    buf[7] = "\x1B[000D";\r
 271                                 buf[2] += ((len-pos)/100) % 10;\r
 272                                 buf[3] += ((len-pos)/10) % 10;\r
 273                                 buf[4] += (len-pos) % 10;\r
 274                                 write(_stdout, 1, &ch); // Print new character\r
 275                                 write(_stdout, len-pos, &ret[pos]);     // Move Text\r
 276                                 write(_stdout, 7, buf); // Update Cursor\r
 277                                 memmove( &ret[pos+1], &ret[pos], len-pos );\r
 278                         }\r
 279                         else {\r
 280                                 write(_stdout, 1, &ch);\r
 281                         }\r
 282                         ret[pos++] = ch;\r
 283                         len ++;\r
 284                         break;\r
 285                 }\r
 286         } while(ch != '\n');\r
 287         \r
 288         // Cap String\r
 289         ret[len] = '\0';\r
 290         printf("\n");\r
 291         \r
 292         // Return length\r
 293         if(Length)      *Length = len;\r
 294         \r
 295         return ret;\r
 296 }\r
 297 \r
 298 /**\r
 299  * \fn void Parse_Args(char *str, char **dest)\r
 300  * \brief Parse a string into an argument array\r
 301  */\r
 302 void Parse_Args(char *str, char **dest)\r
 303 {\r
 304          int    i = 1;\r
 305         char    *buf = malloc( strlen(str) + 1 );\r
 306         \r
 307         if(buf == NULL) {\r
 308                 dest[0] = NULL;\r
 309                 Print("Parse_Args: Out of heap space!\n");\r
 310                 return ;\r
 311         }\r
 312         \r
 313         strcpy(buf, str);\r
 314         dest[0] = buf;\r
 315         \r
 316         // Trim leading whitespace\r
 317         while(*buf == ' ' && *buf)      buf++;\r
 318         \r
 319         for(;;)\r
 320         {\r
 321                 dest[i] = buf;  // Save start of string\r
 322                 i++;\r
 323                 while(*buf && *buf != ' ')\r
 324                 {\r
 325                         if(*buf++ == '"')\r
 326                         {\r
 327                                 while(*buf && !(*buf == '"' && buf[-1] != '\\'))\r
 328                                         buf++;\r
 329                         }\r
 330                 }\r
 331                 if(*buf == '\0')        break;\r
 332                 *buf = '\0';\r
 333                 while(*++buf == ' ' && *buf);\r
 334                 if(*buf == '\0')        break;\r
 335         }\r
 336         dest[i] = NULL;\r
 337         if(i == 1) {\r
 338                 free(buf);\r
 339                 dest[0] = NULL;\r
 340         }\r
 341 }\r
 342 \r
 343 /**\r
 344  * \fn void CallCommand(char **Args)\r
 345  */\r
 346 void CallCommand(char **Args)\r
 347 {\r
 348         t_sysFInfo      info;\r
 349          int    pid = -1;\r
 350          int    fd = 0;\r
 351         char    sTmpBuffer[1024];\r
 352         char    *exefile = Args[0];\r
 353         \r
 354         if(exefile[0] == '/'\r
 355         || (exefile[0] == '.' && exefile[1] == '/')\r
 356         || (exefile[0] == '.' && exefile[1] == '.' && exefile[2] == '/')\r
 357                 )\r
 358         {\r
 359                 GeneratePath(exefile, gsCurrentDirectory, sTmpBuffer);\r
 360                 // Check file existence\r
 361                 fd = open(sTmpBuffer, OPENFLAG_EXEC);\r
 362                 if(fd == -1) {\r
 363                         Print("Unknown Command: `");Print(Args[0]);Print("'\n");        // Error Message\r
 364                         return ;\r
 365                 }\r
 366                 \r
 367                 // Get File info and close file\r
 368                 finfo( fd, &info, 0 );\r
 369                 close( fd );\r
 370                 \r
 371                 // Check if the file is a directory\r
 372                 if(info.flags & FILEFLAG_DIRECTORY) {\r
 373                         Print("`");Print(sTmpBuffer);   // Error Message\r
 374                         Print("' is a directory.\n");\r
 375                         return ;\r
 376                 }\r
 377         }\r
 378         else\r
 379         {\r
 380                  int    i;\r
 381                 \r
 382                 // Check all components of $PATH\r
 383                 for( i = 0; i < giNumPathDirs; i++ )\r
 384                 {\r
 385                         GeneratePath(exefile, gasPathDirs[i], sTmpBuffer);\r
 386                         fd = open(sTmpBuffer, OPENFLAG_EXEC);\r
 387                         if(fd == -1)    continue;\r
 388                         finfo( fd, &info, 0 );\r
 389                         close( fd );\r
 390                         if(info.flags & FILEFLAG_DIRECTORY)     continue;\r
 391                         // Woohoo! We found a valid command\r
 392                         break;\r
 393                 }\r
 394                 \r
 395                 // Exhausted path directories\r
 396                 if( i == giNumPathDirs ) {\r
 397                         Print("Unknown Command: `");Print(exefile);Print("'\n");\r
 398                         return ;\r
 399                 }\r
 400         }\r
 401         \r
 402         // Create new process\r
 403         pid = clone(CLONE_VM, 0);\r
 404         // Start Task\r
 405         if(pid == 0)\r
 406                 execve(sTmpBuffer, Args, gasEnvironment);\r
 407         if(pid <= 0) {\r
 408                 Print("Unablt to create process: `");Print(sTmpBuffer);Print("'\n");    // Error Message\r
 409         }\r
 410         else {\r
 411                  int    status;\r
 412                 waittid(pid, &status);\r
 413         }\r
 414 }\r
 415 \r
 416 /**\r
 417  * \fn void Command_Logout(int argc, char **argv)\r
 418  * \brief Exit the shell, logging the user out\r
 419  */\r
 420 void Command_Logout(int argc, char **argv)\r
 421 {\r
 422         exit(0);\r
 423 }\r
 424 \r
 425 /**\r
 426  * \fn void Command_Colour(int argc, char **argv)\r
 427  * \brief Displays the help screen\r
 428  */\r
 429 void Command_Help(int argc, char **argv)\r
 430 {\r
 431         Print("Acess 2 Command Line Interface\n");\r
 432         Print(" By John Hodge (thePowersGang / [TPG])\n");\r
 433         Print("\n");\r
 434         Print("Builtin Commands:\n");\r
 435         Print(" logout: Return to the login prompt\n");\r
 436         Print(" exit:   Same\n");\r
 437         Print(" help:   Display this message\n");\r
 438         Print(" clear:  Clear the screen\n");\r
 439         Print(" cd:     Change the current directory\n");\r
 440         Print(" dir:    Print the contents of the current directory\n");\r
 441         //Print("\n");\r
 442         return;\r
 443 }\r
 444 \r
 445 /**\r
 446  * \fn void Command_Clear(int argc, char **argv)\r
 447  * \brief Clear the screen\r
 448  */\r
 449 void Command_Clear(int argc, char **argv)\r
 450 {\r
 451         write(_stdout, 4, "\x1B[2J");   //Clear Screen\r
 452 }\r
 453 \r
 454 /**\r
 455  * \fn void Command_Cd(int argc, char **argv)\r
 456  * \brief Change directory\r
 457  */\r
 458 void Command_Cd(int argc, char **argv)\r
 459 {\r
 460         char    tmpPath[1024];\r
 461         int             fp;\r
 462         t_sysFInfo      stats;\r
 463         \r
 464         if(argc < 2)\r
 465         {\r
 466                 Print(gsCurrentDirectory);Print("\n");\r
 467                 return;\r
 468         }\r
 469         \r
 470         GeneratePath(argv[1], gsCurrentDirectory, tmpPath);\r
 471         \r
 472         fp = open(tmpPath, 0);\r
 473         if(fp == -1) {\r
 474                 write(_stdout, 26, "Directory does not exist\n");\r
 475                 return;\r
 476         }\r
 477         finfo(fp, &stats, 0);\r
 478         close(fp);\r
 479         \r
 480         if( !(stats.flags & FILEFLAG_DIRECTORY) ) {\r
 481                 write(_stdout, 17, "Not a Directory\n");\r
 482                 return;\r
 483         }\r
 484         \r
 485         free(gsCurrentDirectory);\r
 486         gsCurrentDirectory = malloc(strlen(tmpPath)+1);\r
 487         strcpy(gsCurrentDirectory, tmpPath);\r
 488         \r
 489         // Register change with kernel\r
 490         chdir( gsCurrentDirectory );\r
 491 }\r
 492 \r
 493 /**\r
 494  * \fn void Command_Dir(int argc, char **argv)\r
 495  * \brief Print the contents of a directory\r
 496  */\r
 497 void Command_Dir(int argc, char **argv)\r
 498 {\r
 499          int    dp, fp, dirLen;\r
 500         char    modeStr[11] = "RWXrwxRWX ";\r
 501         char    tmpPath[1024];\r
 502         char    *fileName;\r
 503         t_sysFInfo      info;\r
 504         t_sysACL        acl;\r
 505         \r
 506         // Generate Directory Path\r
 507         if(argc > 1)\r
 508                 dirLen = GeneratePath(argv[1], gsCurrentDirectory, tmpPath);\r
 509         else\r
 510         {\r
 511                 strcpy(tmpPath, gsCurrentDirectory);\r
 512         }\r
 513         dirLen = strlen(tmpPath);\r
 514         \r
 515         // Open Directory\r
 516         dp = open(tmpPath, OPENFLAG_READ);\r
 517         // Check if file opened\r
 518         if(dp == -1)\r
 519         {\r
 520                 printf("Unable to open directory `%s', File cannot be found\n", tmpPath);\r
 521                 return;\r
 522         }\r
 523         // Get File Stats\r
 524         if( finfo(dp, &info, 0) == -1 )\r
 525         {\r
 526                 close(dp);\r
 527                 write(_stdout, 34, "stat Failed, Bad File Descriptor\n");\r
 528                 return;\r
 529         }\r
 530         // Check if it's a directory\r
 531         if(!(info.flags & FILEFLAG_DIRECTORY))\r
 532         {\r
 533                 close(dp);\r
 534                 write(_stdout, 27, "Unable to open directory `");\r
 535                 write(_stdout, strlen(tmpPath)+1, tmpPath);\r
 536                 write(_stdout, 20, "', Not a directory\n");\r
 537                 return;\r
 538         }\r
 539         \r
 540         // Append Shash for file paths\r
 541         if(tmpPath[dirLen-1] != '/')\r
 542         {\r
 543                 tmpPath[dirLen++] = '/';\r
 544                 tmpPath[dirLen] = '\0';\r
 545         }\r
 546         \r
 547         fileName = (char*)(tmpPath+dirLen);\r
 548         // Read Directory Content\r
 549         while( (fp = readdir(dp, fileName)) )\r
 550         {\r
 551                 if(fp < 0)\r
 552                 {\r
 553                         if(fp == -3)\r
 554                                 write(_stdout, 42, "Invalid Permissions to traverse directory\n");\r
 555                         break;\r
 556                 }\r
 557                 // Open File\r
 558                 fp = open(tmpPath, 0);\r
 559                 if(fp == -1)    continue;\r
 560                 // Get File Stats\r
 561                 finfo(fp, &info, 0);\r
 562                 \r
 563                 if(info.flags & FILEFLAG_DIRECTORY)\r
 564                         write(_stdout, 1, "d");\r
 565                 else\r
 566                         write(_stdout, 1, "-");\r
 567                 \r
 568                 // Print Mode\r
 569                 // - Owner\r
 570                 acl.group = 0;  acl.id = info.uid;\r
 571                 _SysGetACL(fp, &acl);\r
 572                 if(acl.perms & 1)       modeStr[0] = 'r';       else    modeStr[0] = '-';\r
 573                 if(acl.perms & 2)       modeStr[1] = 'w';       else    modeStr[1] = '-';\r
 574                 if(acl.perms & 8)       modeStr[2] = 'x';       else    modeStr[2] = '-';\r
 575                 // - Group\r
 576                 acl.group = 1;  acl.id = info.gid;\r
 577                 _SysGetACL(fp, &acl);\r
 578                 if(acl.perms & 1)       modeStr[3] = 'r';       else    modeStr[3] = '-';\r
 579                 if(acl.perms & 2)       modeStr[4] = 'w';       else    modeStr[4] = '-';\r
 580                 if(acl.perms & 8)       modeStr[5] = 'x';       else    modeStr[5] = '-';\r
 581                 // - World\r
 582                 acl.group = 1;  acl.id = -1;\r
 583                 _SysGetACL(fp, &acl);\r
 584                 if(acl.perms & 1)       modeStr[6] = 'r';       else    modeStr[6] = '-';\r
 585                 if(acl.perms & 2)       modeStr[7] = 'w';       else    modeStr[7] = '-';\r
 586                 if(acl.perms & 8)       modeStr[8] = 'x';       else    modeStr[8] = '-';\r
 587                 write(_stdout, 10, modeStr);\r
 588                 close(fp);\r
 589                 \r
 590                 // Colour Code\r
 591                 if(info.flags & FILEFLAG_DIRECTORY)     // Directory: Green\r
 592                         write(_stdout, 6, "\x1B[32m");\r
 593                 // Default: White\r
 594                 \r
 595                 // Print Name\r
 596                 write(_stdout, strlen(fileName), fileName);\r
 597                 \r
 598                 // Print slash if applicable\r
 599                 if(info.flags & FILEFLAG_DIRECTORY)\r
 600                         write(_stdout, 1, "/");\r
 601                 \r
 602                 // Revert Colour\r
 603                 write(_stdout, 6, "\x1B[37m");\r
 604                 \r
 605                 // Newline!\r
 606                 write(_stdout, 1, "\n");\r
 607         }\r
 608         // Close Directory\r
 609         close(dp);\r
 610 }\r