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 "header.h"\r
   8 \r
   9 #define _stdin  0\r
  10 #define _stdout 1\r
  11 #define _stderr 2\r
  12 \r
  13 // ==== PROTOTYPES ====\r
  14 char    *ReadCommandLine(int *Length);\r
  15 void    Parse_Args(char *str, char **dest);\r
  16 void    CallCommand(char **Args);\r
  17 void    Command_Colour(int argc, char **argv);\r
  18 void    Command_Clear(int argc, char **argv);\r
  19 void    Command_Cd(int argc, char **argv);\r
  20 void    Command_Dir(int argc, char **argv);\r
  21 \r
  22 // ==== CONSTANT GLOBALS ====\r
  23 char    *cCOLOUR_NAMES[8] = {"black", "red", "green", "yellow", "blue", "magenta", "cyan", "white"};\r
  24 struct  {\r
  25         char    *name;\r
  26         void    (*fcn)(int argc, char **argv);\r
  27 }       cBUILTINS[] = {\r
  28         {"colour", Command_Colour}, {"clear", Command_Clear},\r
  29         {"cd", Command_Cd}, {"dir", Command_Dir}\r
  30 };\r
  31 #define BUILTIN_COUNT   (sizeof(cBUILTINS)/sizeof(cBUILTINS[0]))\r
  32 \r
  33 // ==== LOCAL VARIABLES ====\r
  34 char    **gasEnvironment;\r
  35 char    gsCommandBuffer[1024];\r
  36 char    *gsCurrentDirectory = NULL;\r
  37 char    gsTmpBuffer[1024];\r
  38 char    **gasCommandHistory;\r
  39  int    giLastCommand = 0;\r
  40  int    giCommandSpace = 0;\r
  41 \r
  42 // ==== CODE ====\r
  43 int main(int argc, char *argv[], char *envp[])\r
  44 {\r
  45         char    *sCommandStr;\r
  46         char    *saArgs[32];\r
  47          int    length = 0;\r
  48          int    iArgCount = 0;\r
  49          int    bCached = 1;\r
  50         \r
  51         gasEnvironment = envp;\r
  52         \r
  53         Command_Clear(0, NULL);\r
  54         \r
  55         {\r
  56                 char    *tmp = getenv("CWD");\r
  57                 if(tmp) {\r
  58                         gsCurrentDirectory = malloc(strlen(tmp)+1);\r
  59                         strcpy(gsCurrentDirectory, tmp);\r
  60                 } else {\r
  61                         gsCurrentDirectory = malloc(2);\r
  62                         strcpy(gsCurrentDirectory, "/");\r
  63                 }\r
  64         }       \r
  65         \r
  66         write(_stdout, 22, "Acess Shell Version 3\n");\r
  67         write(_stdout,  2, "\n");\r
  68         for(;;)\r
  69         {\r
  70                 // Free last command & arguments\r
  71                 if(saArgs[0])   free(saArgs);\r
  72                 if(!bCached)    free(sCommandStr);\r
  73                 bCached = 0;\r
  74                 write(_stdout, strlen(gsCurrentDirectory), gsCurrentDirectory);\r
  75                 write(_stdout, 3, "$ ");\r
  76                 \r
  77                 // Read Command line\r
  78                 sCommandStr = ReadCommandLine( &length );\r
  79                 \r
  80                 if(!sCommandStr) {\r
  81                         write(_stdout, 25, "PANIC: Out of heap space\n");\r
  82                         return -1;\r
  83                 }\r
  84                 \r
  85                 // Check if the command should be cached\r
  86                 if(gasCommandHistory == NULL || strcmp(sCommandStr, gasCommandHistory[giLastCommand]) != 0)\r
  87                 {\r
  88                         if(giLastCommand >= giCommandSpace) {\r
  89                                 giCommandSpace += 12;\r
  90                                 gasCommandHistory = realloc(gasCommandHistory, giCommandSpace*sizeof(char*));\r
  91                         }\r
  92                         giLastCommand ++;\r
  93                         gasCommandHistory[ giLastCommand ] = sCommandStr;\r
  94                         bCached = 1;\r
  95                 }\r
  96                 \r
  97                 // Parse Command Line into arguments\r
  98                 Parse_Args(sCommandStr, saArgs);\r
  99                 \r
 100                 // Count Arguments\r
 101                 iArgCount = 0;\r
 102                 while(saArgs[iArgCount])        iArgCount++;\r
 103                 \r
 104                 // Silently Ignore all empty commands\r
 105                 if(saArgs[1][0] == '\0')        continue;\r
 106                 \r
 107                 // Check Built-In Commands\r
 108                 //  [HACK] Mem Usage - Use Length in place of `i'\r
 109                 for(length=0;length<BUILTIN_COUNT;length++)\r
 110                 {\r
 111                         if(strcmp(saArgs[1], cBUILTINS[length].name) == 0)\r
 112                         {\r
 113                                 cBUILTINS[length].fcn(iArgCount-1, &saArgs[1]);\r
 114                                 break;\r
 115                         }\r
 116                 }\r
 117                 \r
 118                 if(length != BUILTIN_COUNT)     continue;\r
 119                 \r
 120                 // Shall we?\r
 121                 CallCommand( &saArgs[1] );\r
 122         }\r
 123 }\r
 124 \r
 125 /**\r
 126  * \fn char *ReadCommandLine(int *Length)\r
 127  * \brief Read from the command line\r
 128  */\r
 129 char *ReadCommandLine(int *Length)\r
 130 {\r
 131         char    *ret;\r
 132          int    len, pos, space = 1023;\r
 133         char    ch;\r
 134          \r
 135         // Preset Variables\r
 136         ret = malloc( space+1 );\r
 137         if(!ret)        return NULL;\r
 138         len = 0;\r
 139         pos = 0;\r
 140                 \r
 141         // Read In Command Line\r
 142         do {\r
 143                 read(_stdin, 1, &ch);   // Read Character from stdin (read is a blocking call)\r
 144                 // Ignore control characters\r
 145                 if(ch == '\x1B') {\r
 146                         read(_stdin, 1, &ch);   // Read control character\r
 147                         switch(ch)\r
 148                         {\r
 149                         case 'D':       if(pos) pos--;  break;\r
 150                         case 'C':       if(pos<len)     pos++;  break;\r
 151                         case '[':\r
 152                                 read(_stdin, 1, &ch);   // Read control character\r
 153                                 switch(ch)\r
 154                                 {\r
 155                                 case 'D':       if(pos) pos--;  break;\r
 156                                 case 'C':       if(pos<len)     pos++;  break;\r
 157                                 }\r
 158                         }\r
 159                         continue;\r
 160                 }\r
 161                 // Backspace\r
 162                 if(ch == '\b') {\r
 163                         if(len <= 0)            continue;       // Protect against underflows\r
 164                         if(pos == len) {        // Simple case of end of string\r
 165                                 len --; pos--;\r
 166                         } else {\r
 167                                 memmove(&ret[pos-1], &ret[pos], len-pos);\r
 168                                 pos --;\r
 169                                 len --;\r
 170                         }\r
 171                         write(_stdout, 1, &ch);\r
 172                         continue;\r
 173                 }\r
 174                 // Expand Buffer\r
 175                 if(len > space) {\r
 176                         space += 256;\r
 177                         ret = realloc(ret, space+1);\r
 178                         if(!ret)        return NULL;\r
 179                 }\r
 180                 \r
 181                 write(_stdout, 1, &ch);\r
 182                 ret[pos++] = ch;\r
 183                 len ++;\r
 184         } while(ch != '\n');\r
 185         \r
 186         // Remove newline\r
 187         pos --;\r
 188         ret[pos] = '\0';\r
 189         \r
 190         // Return length\r
 191         if(Length)      *Length = len;\r
 192         \r
 193         return ret;\r
 194 }\r
 195 \r
 196 /**\r
 197  * \fn void Parse_Args(char *str, char **dest)\r
 198  * \brief Parse a string into an argument array\r
 199  */\r
 200 void Parse_Args(char *str, char **dest)\r
 201 {\r
 202          int    i = 1;\r
 203         char    *buf = malloc( strlen(str) + 1 );\r
 204         \r
 205         if(buf == NULL) {\r
 206                 dest[0] = NULL;\r
 207                 Print("Parse_Args: Out of heap space!\n");\r
 208                 return ;\r
 209         }\r
 210         \r
 211         strcpy(buf, str);\r
 212         dest[0] = buf;\r
 213         \r
 214         // Trim leading whitespace\r
 215         while(*buf == ' ' && *buf)      buf++;\r
 216         \r
 217         for(;;)\r
 218         {\r
 219                 dest[i] = buf;  // Save start of string\r
 220                 i++;\r
 221                 while(*buf && *buf != ' ')\r
 222                 {\r
 223                         if(*buf++ == '"')\r
 224                         {\r
 225                                 while(*buf && !(*buf == '"' && buf[-1] != '\\'))\r
 226                                         buf++;\r
 227                         }\r
 228                 }\r
 229                 if(*buf == '\0')        break;\r
 230                 *buf = '\0';\r
 231                 while(*++buf == ' ' && *buf);\r
 232                 if(*buf == '\0')        break;\r
 233         }\r
 234         dest[i] = NULL;\r
 235         if(i == 1) {\r
 236                 free(buf);\r
 237                 dest[0] = NULL;\r
 238         }\r
 239 }\r
 240 \r
 241 /**\r
 242  * \fn void CallCommand(char **Args)\r
 243  */\r
 244 void CallCommand(char **Args)\r
 245 {\r
 246         t_sysFInfo      info;\r
 247          int    pid = -1;\r
 248          int    fd = 0;\r
 249         \r
 250         \r
 251         // - Calling a file\r
 252         GeneratePath(Args[0], gsCurrentDirectory, gsTmpBuffer);\r
 253         \r
 254         \r
 255         // Check file existence\r
 256         fd = open(gsTmpBuffer, 0);\r
 257         if(fd == -1) {\r
 258                 Print("Unknown Command: `");Print(Args[0]);Print("'\n");        // Error Message\r
 259                 return ;\r
 260         }\r
 261         \r
 262         // Check if the file is a directory\r
 263         finfo( fd, &info, 0 );\r
 264         close( fd );\r
 265         if(info.flags & FILEFLAG_DIRECTORY) {\r
 266                 Print("`");Print(gsTmpBuffer);  // Error Message\r
 267                 Print("' is a directory.\n");\r
 268                 return ;\r
 269         }\r
 270         \r
 271         // Create new process\r
 272         pid = clone(CLONE_VM, 0);\r
 273         // Start Task\r
 274         if(pid == 0)\r
 275                 execve(gsTmpBuffer, Args, gasEnvironment);\r
 276         if(pid <= 0) {\r
 277                 Print("Unablt to create process: `");Print(gsTmpBuffer);Print("'\n");   // Error Message\r
 278         }\r
 279         else {\r
 280                  int    status;\r
 281                 waittid(pid, &status);\r
 282         }\r
 283 }\r
 284 \r
 285 /**\r
 286  * \fn void Command_Colour(int argc, char **argv)\r
 287  * \brief \r
 288  */\r
 289 void Command_Colour(int argc, char **argv)\r
 290 {\r
 291         int fg, bg;\r
 292         char    clrStr[6] = "\x1B[37m";\r
 293         \r
 294         // Verify Arg Count\r
 295         if(argc < 2)\r
 296         {\r
 297                 Print("Please specify a colour\n");\r
 298                 goto usage;\r
 299         }\r
 300         \r
 301         // Check Colour\r
 302         for(fg=0;fg<8;fg++)\r
 303                 if(strcmp(cCOLOUR_NAMES[fg], argv[1]) == 0)\r
 304                         break;\r
 305 \r
 306         // Foreground a valid colour\r
 307         if(fg == 8) {\r
 308                 Print("Unknown Colour '");Print(argv[1]);Print("'\n");\r
 309                 goto usage;\r
 310         }\r
 311         // Set Foreground\r
 312         clrStr[3] = '0' + fg;\r
 313         write(_stdout, 6, clrStr);\r
 314         \r
 315         // Need to Set Background?\r
 316         if(argc > 2)\r
 317         {\r
 318                 for(bg=0;bg<8;bg++)\r
 319                         if(strcmp(cCOLOUR_NAMES[bg], argv[2]) == 0)\r
 320                                 break;\r
 321         \r
 322                 // Valid colour\r
 323                 if(bg == 8)\r
 324                 {\r
 325                         Print("Unknown Colour '");Print(argv[2]);Print("'\n");\r
 326                         goto usage;\r
 327                 }\r
 328         \r
 329                 clrStr[2] = '4';\r
 330                 clrStr[3] = '0' + bg;\r
 331                 write(_stdout, 6, clrStr);\r
 332         }\r
 333         // Return\r
 334         return;\r
 335 \r
 336         // Function Usage (Requested via a Goto (I know it's ugly))\r
 337 usage:\r
 338         Print("Valid Colours are ");\r
 339         for(fg=0;fg<8;fg++)\r
 340         {\r
 341                 Print(cCOLOUR_NAMES[fg]);\r
 342                 write(_stdout, 3, ", ");\r
 343         }\r
 344         write(_stdout, 4, "\b\b\n");\r
 345         return;\r
 346 }\r
 347 \r
 348 void Command_Clear(int argc, char **argv)\r
 349 {\r
 350         write(_stdout, 4, "\x1B[2J");   //Clear Screen\r
 351 }\r
 352 \r
 353 /**\r
 354  * \fn void Command_Cd(int argc, char **argv)\r
 355  * \brief Change directory\r
 356  */\r
 357 void Command_Cd(int argc, char **argv)\r
 358 {\r
 359         char    tmpPath[1024];\r
 360         int             fp;\r
 361         t_sysFInfo      stats;\r
 362         \r
 363         if(argc < 2)\r
 364         {\r
 365                 Print(gsCurrentDirectory);Print("\n");\r
 366                 return;\r
 367         }\r
 368         \r
 369         GeneratePath(argv[1], gsCurrentDirectory, tmpPath);\r
 370         \r
 371         fp = open(tmpPath, 0);\r
 372         if(fp == -1) {\r
 373                 write(_stdout, 26, "Directory does not exist\n");\r
 374                 return;\r
 375         }\r
 376         finfo(fp, &stats, 0);\r
 377         close(fp);\r
 378         \r
 379         if( !(stats.flags & FILEFLAG_DIRECTORY) ) {\r
 380                 write(_stdout, 17, "Not a Directory\n");\r
 381                 return;\r
 382         }\r
 383         \r
 384         free(gsCurrentDirectory);\r
 385         gsCurrentDirectory = malloc(strlen(tmpPath)+1);\r
 386         strcpy(gsCurrentDirectory, tmpPath);\r
 387         \r
 388         // Register change with kernel\r
 389         chdir( gsCurrentDirectory );\r
 390 }\r
 391 \r
 392 /**\r
 393  */\r
 394 void Command_Dir(int argc, char **argv)\r
 395 {\r
 396          int    dp, fp, dirLen;\r
 397         char    modeStr[11] = "RWXrwxRWX ";\r
 398         char    tmpPath[1024];\r
 399         char    *fileName;\r
 400         t_sysFInfo      info;\r
 401         t_sysACL        acl;\r
 402         \r
 403         // Generate Directory Path\r
 404         if(argc > 1)\r
 405                 dirLen = GeneratePath(argv[1], gsCurrentDirectory, tmpPath);\r
 406         else\r
 407         {\r
 408                 strcpy(tmpPath, gsCurrentDirectory);\r
 409         }\r
 410         dirLen = strlen(tmpPath);\r
 411         \r
 412         // Open Directory\r
 413         dp = open(tmpPath, OPENFLAG_READ);\r
 414         // Check if file opened\r
 415         if(dp == -1)\r
 416         {\r
 417                 //printf("Unable to open directory `%s', File cannot be found\n", tmpPath);\r
 418                 write(_stdout, 27, "Unable to open directory `");\r
 419                 write(_stdout, strlen(tmpPath)+1, tmpPath);\r
 420                 write(_stdout, 25, "', File cannot be found\n");\r
 421                 return;\r
 422         }\r
 423         // Get File Stats\r
 424         if( finfo(dp, &info, 0) == -1 )\r
 425         {\r
 426                 close(dp);\r
 427                 write(_stdout, 34, "stat Failed, Bad File Descriptor\n");\r
 428                 return;\r
 429         }\r
 430         // Check if it's a directory\r
 431         if(!(info.flags & FILEFLAG_DIRECTORY))\r
 432         {\r
 433                 close(dp);\r
 434                 write(_stdout, 27, "Unable to open directory `");\r
 435                 write(_stdout, strlen(tmpPath)+1, tmpPath);\r
 436                 write(_stdout, 20, "', Not a directory\n");\r
 437                 return;\r
 438         }\r
 439         \r
 440         // Append Shash for file paths\r
 441         if(tmpPath[dirLen-1] != '/')\r
 442         {\r
 443                 tmpPath[dirLen++] = '/';\r
 444                 tmpPath[dirLen] = '\0';\r
 445         }\r
 446         \r
 447         fileName = (char*)(tmpPath+dirLen);\r
 448         // Read Directory Content\r
 449         while( (fp = readdir(dp, fileName)) )\r
 450         {\r
 451                 if(fp < 0)\r
 452                 {\r
 453                         if(fp == -3)\r
 454                                 write(_stdout, 42, "Invalid Permissions to traverse directory\n");\r
 455                         break;\r
 456                 }\r
 457                 // Open File\r
 458                 fp = open(tmpPath, 0);\r
 459                 if(fp == -1)    continue;\r
 460                 // Get File Stats\r
 461                 finfo(fp, &info, 0);\r
 462                 \r
 463                 if(info.flags & FILEFLAG_DIRECTORY)\r
 464                         write(_stdout, 1, "d");\r
 465                 else\r
 466                         write(_stdout, 1, "-");\r
 467                 \r
 468                 // Print Mode\r
 469                 acl.group = 0;  acl.id = info.uid;\r
 470                 _SysGetACL(fp, &acl);\r
 471                 if(acl.perms & 1)       modeStr[0] = 'r';       else    modeStr[0] = '-';\r
 472                 if(acl.perms & 2)       modeStr[1] = 'w';       else    modeStr[1] = '-';\r
 473                 if(acl.perms & 8)       modeStr[2] = 'x';       else    modeStr[2] = '-';\r
 474                 acl.group = 1;  acl.id = info.gid;\r
 475                 _SysGetACL(fp, &acl);\r
 476                 if(acl.perms & 1)       modeStr[3] = 'r';       else    modeStr[3] = '-';\r
 477                 if(acl.perms & 1)       modeStr[4] = 'w';       else    modeStr[4] = '-';\r
 478                 if(acl.perms & 1)       modeStr[5] = 'x';       else    modeStr[5] = '-';\r
 479                 acl.group = 1;  acl.id = -1;\r
 480                 _SysGetACL(fp, &acl);\r
 481                 if(acl.perms & 1)       modeStr[6] = 'r';       else    modeStr[6] = '-';\r
 482                 if(acl.perms & 1)       modeStr[7] = 'w';       else    modeStr[7] = '-';\r
 483                 if(acl.perms & 1)       modeStr[8] = 'x';       else    modeStr[8] = '-';\r
 484                 write(_stdout, 10, modeStr);\r
 485                 close(fp);\r
 486                 \r
 487                 // Colour Code\r
 488                 if(info.flags & FILEFLAG_DIRECTORY)     // Directory: Green\r
 489                         write(_stdout, 6, "\x1B[32m");\r
 490                 // Default: White\r
 491                 \r
 492                 // Print Name\r
 493                 write(_stdout, strlen(fileName), fileName);\r
 494                 \r
 495                 // Print slash if applicable\r
 496                 if(info.flags & FILEFLAG_DIRECTORY)\r
 497                         write(_stdout, 1, "/");\r
 498                 \r
 499                 // Revert Colour\r
 500                 write(_stdout, 6, "\x1B[37m");\r
 501                 \r
 502                 // Newline!\r
 503                 write(_stdout, 1, "\n");\r
 504         }\r
 505         // Close Directory\r
 506         close(dp);\r
 507 }\r