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_Colour(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 char    *cCOLOUR_NAMES[8] = {"black", "red", "green", "yellow", "blue", "magenta", "cyan", "white"};\r
  26 struct  {\r
  27         char    *name;\r
  28         void    (*fcn)(int argc, char **argv);\r
  29 }       cBUILTINS[] = {\r
  30         {"exit", Command_Logout},       {"logout", Command_Logout},\r
  31         {"colour", Command_Colour}, {"clear", Command_Clear},\r
  32         {"cd", Command_Cd}, {"dir", Command_Dir}\r
  33 };\r
  34 static char     *cDEFAULT_PATH[] = {"/Acess/Bin"};\r
  35 #define BUILTIN_COUNT   (sizeof(cBUILTINS)/sizeof(cBUILTINS[0]))\r
  36 \r
  37 // ==== LOCAL VARIABLES ====\r
  38  int    giNumPathDirs = 1;\r
  39 char    **gasPathDirs = cDEFAULT_PATH;\r
  40 char    **gasEnvironment;\r
  41 char    gsCommandBuffer[1024];\r
  42 char    *gsCurrentDirectory = NULL;\r
  43 char    **gasCommandHistory;\r
  44  int    giLastCommand = 0;\r
  45  int    giCommandSpace = 0;\r
  46 \r
  47 // ==== CODE ====\r
  48 int main(int argc, char *argv[], char *envp[])\r
  49 {\r
  50         char    *sCommandStr;\r
  51         char    *saArgs[32] = {0};\r
  52          int    length = 0;\r
  53          int    i;\r
  54          int    iArgCount = 0;\r
  55          int    bCached = 1;\r
  56         \r
  57         gasEnvironment = envp;\r
  58         \r
  59         Command_Clear(0, NULL);\r
  60         \r
  61         {\r
  62                 char    *tmp = getenv("CWD");\r
  63                 if(tmp) {\r
  64                         gsCurrentDirectory = malloc(strlen(tmp)+1);\r
  65                         strcpy(gsCurrentDirectory, tmp);\r
  66                 } else {\r
  67                         gsCurrentDirectory = malloc(2);\r
  68                         strcpy(gsCurrentDirectory, "/");\r
  69                 }\r
  70         }       \r
  71         \r
  72         write(_stdout, 22, "Acess Shell Version 3\n");\r
  73         write(_stdout,  2, "\n");\r
  74         for(;;)\r
  75         {\r
  76                 // Free last command & arguments\r
  77                 if(saArgs[0])   free(saArgs);\r
  78                 if(!bCached)    free(sCommandStr);\r
  79                 bCached = 0;\r
  80                 write(_stdout, strlen(gsCurrentDirectory), gsCurrentDirectory);\r
  81                 write(_stdout, 3, "$ ");\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          \r
 139         // Preset Variables\r
 140         ret = malloc( space+1 );\r
 141         if(!ret)        return NULL;\r
 142         len = 0;        pos = 0;\r
 143                 \r
 144         // Read In Command Line\r
 145         do {\r
 146                 read(_stdin, 1, &ch);   // Read Character from stdin (read is a blocking call)\r
 147                 // Ignore control characters\r
 148                 if(ch == '\x1B') {\r
 149                         read(_stdin, 1, &ch);   // Read control character\r
 150                         switch(ch)\r
 151                         {\r
 152                         case 'D':       if(pos) pos--;  break;\r
 153                         case 'C':       if(pos<len)     pos++;  break;\r
 154                         case '[':\r
 155                                 read(_stdin, 1, &ch);   // Read control character\r
 156                                 switch(ch)\r
 157                                 {\r
 158                                 case 'D':       if(pos) pos--;  break;\r
 159                                 case 'C':       if(pos<len)     pos++;  break;\r
 160                                 }\r
 161                         }\r
 162                         continue;\r
 163                 }\r
 164                 // Backspace\r
 165                 if(ch == '\b') {\r
 166                         if(len <= 0)            continue;       // Protect against underflows\r
 167                         if(pos == len) {        // Simple case of end of string\r
 168                                 len --; pos--;\r
 169                         } else {\r
 170                                 memmove(&ret[pos-1], &ret[pos], len-pos);\r
 171                                 pos --;\r
 172                                 len --;\r
 173                         }\r
 174                         write(_stdout, 1, &ch);\r
 175                         continue;\r
 176                 }\r
 177                 // Expand Buffer\r
 178                 if(len > space) {\r
 179                         space += 256;\r
 180                         ret = realloc(ret, space+1);\r
 181                         if(!ret)        return NULL;\r
 182                 }\r
 183                 \r
 184                 write(_stdout, 1, &ch);\r
 185                 ret[pos++] = ch;\r
 186                 len ++;\r
 187         } while(ch != '\n');\r
 188         \r
 189         // Remove newline\r
 190         pos --;\r
 191         ret[pos] = '\0';\r
 192         \r
 193         // Return length\r
 194         if(Length)      *Length = len;\r
 195         \r
 196         return ret;\r
 197 }\r
 198 \r
 199 /**\r
 200  * \fn void Parse_Args(char *str, char **dest)\r
 201  * \brief Parse a string into an argument array\r
 202  */\r
 203 void Parse_Args(char *str, char **dest)\r
 204 {\r
 205          int    i = 1;\r
 206         char    *buf = malloc( strlen(str) + 1 );\r
 207         \r
 208         if(buf == NULL) {\r
 209                 dest[0] = NULL;\r
 210                 Print("Parse_Args: Out of heap space!\n");\r
 211                 return ;\r
 212         }\r
 213         \r
 214         strcpy(buf, str);\r
 215         dest[0] = buf;\r
 216         \r
 217         // Trim leading whitespace\r
 218         while(*buf == ' ' && *buf)      buf++;\r
 219         \r
 220         for(;;)\r
 221         {\r
 222                 dest[i] = buf;  // Save start of string\r
 223                 i++;\r
 224                 while(*buf && *buf != ' ')\r
 225                 {\r
 226                         if(*buf++ == '"')\r
 227                         {\r
 228                                 while(*buf && !(*buf == '"' && buf[-1] != '\\'))\r
 229                                         buf++;\r
 230                         }\r
 231                 }\r
 232                 if(*buf == '\0')        break;\r
 233                 *buf = '\0';\r
 234                 while(*++buf == ' ' && *buf);\r
 235                 if(*buf == '\0')        break;\r
 236         }\r
 237         dest[i] = NULL;\r
 238         if(i == 1) {\r
 239                 free(buf);\r
 240                 dest[0] = NULL;\r
 241         }\r
 242 }\r
 243 \r
 244 /**\r
 245  * \fn void CallCommand(char **Args)\r
 246  */\r
 247 void CallCommand(char **Args)\r
 248 {\r
 249         t_sysFInfo      info;\r
 250          int    pid = -1;\r
 251          int    fd = 0;\r
 252         char    sTmpBuffer[1024];\r
 253         char    *exefile = Args[0];\r
 254         \r
 255         if(exefile[0] == '/'\r
 256         || (exefile[0] == '.' && exefile[1] == '/')\r
 257         || (exefile[0] == '.' && exefile[1] == '.' && exefile[2] == '/')\r
 258                 )\r
 259         {\r
 260                 GeneratePath(exefile, gsCurrentDirectory, sTmpBuffer);\r
 261                 // Check file existence\r
 262                 fd = open(sTmpBuffer, OPENFLAG_EXEC);\r
 263                 if(fd == -1) {\r
 264                         Print("Unknown Command: `");Print(Args[0]);Print("'\n");        // Error Message\r
 265                         return ;\r
 266                 }\r
 267                 \r
 268                 // Get File info and close file\r
 269                 finfo( fd, &info, 0 );\r
 270                 close( fd );\r
 271                 \r
 272                 // Check if the file is a directory\r
 273                 if(info.flags & FILEFLAG_DIRECTORY) {\r
 274                         Print("`");Print(sTmpBuffer);   // Error Message\r
 275                         Print("' is a directory.\n");\r
 276                         return ;\r
 277                 }\r
 278         }\r
 279         else\r
 280         {\r
 281                  int    i;\r
 282                 \r
 283                 // Check all components of $PATH\r
 284                 for( i = 0; i < giNumPathDirs; i++ )\r
 285                 {\r
 286                         GeneratePath(exefile, gasPathDirs[i], sTmpBuffer);\r
 287                         fd = open(sTmpBuffer, OPENFLAG_EXEC);\r
 288                         if(fd == -1)    continue;\r
 289                         finfo( fd, &info, 0 );\r
 290                         close( fd );\r
 291                         if(info.flags & FILEFLAG_DIRECTORY)     continue;\r
 292                         // Woohoo! We found a valid command\r
 293                         break;\r
 294                 }\r
 295                 \r
 296                 // Exhausted path directories\r
 297                 if( i == giNumPathDirs ) {\r
 298                         Print("Unknown Command: `");Print(exefile);Print("'\n");\r
 299                         return ;\r
 300                 }\r
 301         }\r
 302         \r
 303         // Create new process\r
 304         pid = clone(CLONE_VM, 0);\r
 305         // Start Task\r
 306         if(pid == 0)\r
 307                 execve(sTmpBuffer, Args, gasEnvironment);\r
 308         if(pid <= 0) {\r
 309                 Print("Unablt to create process: `");Print(sTmpBuffer);Print("'\n");    // Error Message\r
 310         }\r
 311         else {\r
 312                  int    status;\r
 313                 waittid(pid, &status);\r
 314         }\r
 315 }\r
 316 \r
 317 /**\r
 318  * \fn void Command_Logout(int argc, char **argv)\r
 319  * \brief Exit the shell, logging the user out\r
 320  */\r
 321 void Command_Logout(int argc, char **argv)\r
 322 {\r
 323         exit(0);\r
 324 }\r
 325 \r
 326 /**\r
 327  * \fn void Command_Clear(int argc, char **argv)\r
 328  * \brief Clear the screen\r
 329  */\r
 330 void Command_Clear(int argc, char **argv)\r
 331 {\r
 332         write(_stdout, 4, "\x1B[2J");   //Clear Screen\r
 333 }\r
 334 \r
 335 /**\r
 336  * \fn void Command_Colour(int argc, char **argv)\r
 337  * \brief Set the colour of the shell prompt\r
 338  * \note Conflicts with coloured `dir` display\r
 339  */\r
 340 void Command_Colour(int argc, char **argv)\r
 341 {\r
 342         int fg, bg;\r
 343         char    clrStr[6] = "\x1B[37m";\r
 344         \r
 345         // Verify Arg Count\r
 346         if(argc < 2)\r
 347         {\r
 348                 goto usage;\r
 349         }\r
 350         \r
 351         // Check Colour\r
 352         for(fg=0;fg<8;fg++)\r
 353                 if(strcmp(cCOLOUR_NAMES[fg], argv[1]) == 0)\r
 354                         break;\r
 355 \r
 356         // Foreground a valid colour\r
 357         if(fg == 8) {\r
 358                 Print("Unknown Colour '");Print(argv[1]);Print("'\n");\r
 359                 goto usage;\r
 360         }\r
 361         // Set Foreground\r
 362         clrStr[3] = '0' + fg;\r
 363         write(_stdout, 6, clrStr);\r
 364         \r
 365         // Need to Set Background?\r
 366         if(argc > 2)\r
 367         {\r
 368                 for(bg=0;bg<8;bg++)\r
 369                         if(strcmp(cCOLOUR_NAMES[bg], argv[2]) == 0)\r
 370                                 break;\r
 371         \r
 372                 // Valid colour\r
 373                 if(bg == 8)\r
 374                 {\r
 375                         Print("Unknown Colour '");Print(argv[2]);Print("'\n");\r
 376                         goto usage;\r
 377                 }\r
 378         \r
 379                 clrStr[2] = '4';\r
 380                 clrStr[3] = '0' + bg;\r
 381                 write(_stdout, 6, clrStr);\r
 382         }\r
 383         // Return\r
 384         return;\r
 385 \r
 386         // Function Usage (Requested via a Goto (I know it's ugly))\r
 387 usage:\r
 388         Print("Usage: colour <foreground> [<background>]\n");\r
 389         Print("Valid Colours are ");\r
 390         for(fg=0;fg<8;fg++)\r
 391         {\r
 392                 Print(cCOLOUR_NAMES[fg]);\r
 393                 write(_stdout, 3, ", ");\r
 394         }\r
 395         write(_stdout, 4, "\b\b\n");\r
 396         return;\r
 397 }\r
 398 \r
 399 /**\r
 400  * \fn void Command_Cd(int argc, char **argv)\r
 401  * \brief Change directory\r
 402  */\r
 403 void Command_Cd(int argc, char **argv)\r
 404 {\r
 405         char    tmpPath[1024];\r
 406         int             fp;\r
 407         t_sysFInfo      stats;\r
 408         \r
 409         if(argc < 2)\r
 410         {\r
 411                 Print(gsCurrentDirectory);Print("\n");\r
 412                 return;\r
 413         }\r
 414         \r
 415         GeneratePath(argv[1], gsCurrentDirectory, tmpPath);\r
 416         \r
 417         fp = open(tmpPath, 0);\r
 418         if(fp == -1) {\r
 419                 write(_stdout, 26, "Directory does not exist\n");\r
 420                 return;\r
 421         }\r
 422         finfo(fp, &stats, 0);\r
 423         close(fp);\r
 424         \r
 425         if( !(stats.flags & FILEFLAG_DIRECTORY) ) {\r
 426                 write(_stdout, 17, "Not a Directory\n");\r
 427                 return;\r
 428         }\r
 429         \r
 430         free(gsCurrentDirectory);\r
 431         gsCurrentDirectory = malloc(strlen(tmpPath)+1);\r
 432         strcpy(gsCurrentDirectory, tmpPath);\r
 433         \r
 434         // Register change with kernel\r
 435         chdir( gsCurrentDirectory );\r
 436 }\r
 437 \r
 438 /**\r
 439  * \fn void Command_Dir(int argc, char **argv)\r
 440  * \brief Print the contents of a directory\r
 441  */\r
 442 void Command_Dir(int argc, char **argv)\r
 443 {\r
 444          int    dp, fp, dirLen;\r
 445         char    modeStr[11] = "RWXrwxRWX ";\r
 446         char    tmpPath[1024];\r
 447         char    *fileName;\r
 448         t_sysFInfo      info;\r
 449         t_sysACL        acl;\r
 450         \r
 451         // Generate Directory Path\r
 452         if(argc > 1)\r
 453                 dirLen = GeneratePath(argv[1], gsCurrentDirectory, tmpPath);\r
 454         else\r
 455         {\r
 456                 strcpy(tmpPath, gsCurrentDirectory);\r
 457         }\r
 458         dirLen = strlen(tmpPath);\r
 459         \r
 460         // Open Directory\r
 461         dp = open(tmpPath, OPENFLAG_READ);\r
 462         // Check if file opened\r
 463         if(dp == -1)\r
 464         {\r
 465                 //printf("Unable to open directory `%s', File cannot be found\n", tmpPath);\r
 466                 write(_stdout, 27, "Unable to open directory `");\r
 467                 write(_stdout, strlen(tmpPath)+1, tmpPath);\r
 468                 write(_stdout, 25, "', File cannot be found\n");\r
 469                 return;\r
 470         }\r
 471         // Get File Stats\r
 472         if( finfo(dp, &info, 0) == -1 )\r
 473         {\r
 474                 close(dp);\r
 475                 write(_stdout, 34, "stat Failed, Bad File Descriptor\n");\r
 476                 return;\r
 477         }\r
 478         // Check if it's a directory\r
 479         if(!(info.flags & FILEFLAG_DIRECTORY))\r
 480         {\r
 481                 close(dp);\r
 482                 write(_stdout, 27, "Unable to open directory `");\r
 483                 write(_stdout, strlen(tmpPath)+1, tmpPath);\r
 484                 write(_stdout, 20, "', Not a directory\n");\r
 485                 return;\r
 486         }\r
 487         \r
 488         // Append Shash for file paths\r
 489         if(tmpPath[dirLen-1] != '/')\r
 490         {\r
 491                 tmpPath[dirLen++] = '/';\r
 492                 tmpPath[dirLen] = '\0';\r
 493         }\r
 494         \r
 495         fileName = (char*)(tmpPath+dirLen);\r
 496         // Read Directory Content\r
 497         while( (fp = readdir(dp, fileName)) )\r
 498         {\r
 499                 if(fp < 0)\r
 500                 {\r
 501                         if(fp == -3)\r
 502                                 write(_stdout, 42, "Invalid Permissions to traverse directory\n");\r
 503                         break;\r
 504                 }\r
 505                 // Open File\r
 506                 fp = open(tmpPath, 0);\r
 507                 if(fp == -1)    continue;\r
 508                 // Get File Stats\r
 509                 finfo(fp, &info, 0);\r
 510                 \r
 511                 if(info.flags & FILEFLAG_DIRECTORY)\r
 512                         write(_stdout, 1, "d");\r
 513                 else\r
 514                         write(_stdout, 1, "-");\r
 515                 \r
 516                 // Print Mode\r
 517                 // - Owner\r
 518                 acl.group = 0;  acl.id = info.uid;\r
 519                 _SysGetACL(fp, &acl);\r
 520                 if(acl.perms & 1)       modeStr[0] = 'r';       else    modeStr[0] = '-';\r
 521                 if(acl.perms & 2)       modeStr[1] = 'w';       else    modeStr[1] = '-';\r
 522                 if(acl.perms & 8)       modeStr[2] = 'x';       else    modeStr[2] = '-';\r
 523                 // - Group\r
 524                 acl.group = 1;  acl.id = info.gid;\r
 525                 _SysGetACL(fp, &acl);\r
 526                 if(acl.perms & 1)       modeStr[3] = 'r';       else    modeStr[3] = '-';\r
 527                 if(acl.perms & 2)       modeStr[4] = 'w';       else    modeStr[4] = '-';\r
 528                 if(acl.perms & 8)       modeStr[5] = 'x';       else    modeStr[5] = '-';\r
 529                 // - World\r
 530                 acl.group = 1;  acl.id = -1;\r
 531                 _SysGetACL(fp, &acl);\r
 532                 if(acl.perms & 1)       modeStr[6] = 'r';       else    modeStr[6] = '-';\r
 533                 if(acl.perms & 2)       modeStr[7] = 'w';       else    modeStr[7] = '-';\r
 534                 if(acl.perms & 8)       modeStr[8] = 'x';       else    modeStr[8] = '-';\r
 535                 write(_stdout, 10, modeStr);\r
 536                 close(fp);\r
 537                 \r
 538                 // Colour Code\r
 539                 if(info.flags & FILEFLAG_DIRECTORY)     // Directory: Green\r
 540                         write(_stdout, 6, "\x1B[32m");\r
 541                 // Default: White\r
 542                 \r
 543                 // Print Name\r
 544                 write(_stdout, strlen(fileName), fileName);\r
 545                 \r
 546                 // Print slash if applicable\r
 547                 if(info.flags & FILEFLAG_DIRECTORY)\r
 548                         write(_stdout, 1, "/");\r
 549                 \r
 550                 // Revert Colour\r
 551                 write(_stdout, 6, "\x1B[37m");\r
 552                 \r
 553                 // Newline!\r
 554                 write(_stdout, 1, "\n");\r
 555         }\r
 556         // Close Directory\r
 557         close(dp);\r
 558 }\r