Usermode/Applications/CLIShell_src/main.c

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