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 #include <readline.h>\r
  11 \r
  12 #define _stdin  0\r
  13 #define _stdout 1\r
  14 #define _stderr 2\r
  15 \r
  16 // ==== PROTOTYPES ====\r
  17  int    Parse_Args(const char *str, char **dest);\r
  18 void    CallCommand(char **Args);\r
  19 void    Command_Logout(int argc, char **argv);\r
  20 void    Command_Clear(int argc, char **argv);\r
  21 void    Command_Help(int argc, char **argv);\r
  22 void    Command_Cd(int argc, char **argv);\r
  23 void    Command_Dir(int argc, char **argv);\r
  24 \r
  25 // ==== CONSTANT GLOBALS ====\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         {"help", Command_Help}, {"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         tReadline       *readline_state = Readline_Init(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         printf("Acess Shell Version 3\n\n");\r
  73         for(;;)\r
  74         {\r
  75                 // Free last command & arguments\r
  76                 if(saArgs[0])   free(saArgs[0]);\r
  77                 \r
  78                 printf("%s$ ", gsCurrentDirectory);\r
  79                 \r
  80                 // Read Command line\r
  81                 sCommandStr = Readline( readline_state );\r
  82                 printf("\n");\r
  83                 length = strlen(sCommandStr);\r
  84                 \r
  85                 // Parse Command Line into arguments\r
  86                 iArgCount = Parse_Args(sCommandStr, saArgs);\r
  87                 \r
  88                 // Silently Ignore all empty commands\r
  89                 if(saArgs[1][0] == '\0')        continue;\r
  90                 \r
  91                 // Check Built-In Commands\r
  92                 for( i = 0; i < BUILTIN_COUNT; i++ )\r
  93                 {\r
  94                         if( strcmp(saArgs[1], cBUILTINS[i].name) == 0 )\r
  95                         {\r
  96                                 cBUILTINS[i].fcn(iArgCount-1, &saArgs[1]);\r
  97                                 break;\r
  98                         }\r
  99                 }\r
 100                 if(i != BUILTIN_COUNT)  continue;\r
 101                 \r
 102                 // Shall we?\r
 103                 CallCommand( &saArgs[1] );\r
 104                 \r
 105                 free( sCommandStr );\r
 106         }\r
 107 }\r
 108 \r
 109 /**\r
 110  * \fn int Parse_Args(const char *str, char **dest)\r
 111  * \brief Parse a string into an argument array\r
 112  */\r
 113 int Parse_Args(const char *str, char **dest)\r
 114 {\r
 115          int    i = 1;\r
 116         char    *buf = malloc( strlen(str) + 1 );\r
 117         \r
 118         if(buf == NULL) {\r
 119                 dest[0] = NULL;\r
 120                 printf("Parse_Args: Out of heap space!\n");\r
 121                 return 0;\r
 122         }\r
 123         \r
 124         strcpy(buf, str);\r
 125         dest[0] = buf;\r
 126         \r
 127         // Trim leading whitespace\r
 128         while(*buf == ' ' && *buf)      buf++;\r
 129         \r
 130         for(;;)\r
 131         {\r
 132                 dest[i] = buf;  // Save start of string\r
 133                 i++;\r
 134                 while(*buf && *buf != ' ')\r
 135                 {\r
 136                         if(*buf++ == '"')\r
 137                         {\r
 138                                 while(*buf && !(*buf == '"' && buf[-1] != '\\'))\r
 139                                         buf++;\r
 140                         }\r
 141                 }\r
 142                 if(*buf == '\0')        break;\r
 143                 *buf = '\0';\r
 144                 while(*++buf == ' ' && *buf);\r
 145                 if(*buf == '\0')        break;\r
 146         }\r
 147         dest[i] = NULL;\r
 148         \r
 149         return i;\r
 150 }\r
 151 \r
 152 /**\r
 153  * \fn void CallCommand(char **Args)\r
 154  */\r
 155 void CallCommand(char **Args)\r
 156 {\r
 157         t_sysFInfo      info;\r
 158          int    pid = -1;\r
 159          int    fd = 0;\r
 160         char    sTmpBuffer[1024];\r
 161         char    *exefile = Args[0];\r
 162         \r
 163         if(exefile[0] == '/'\r
 164         || (exefile[0] == '.' && exefile[1] == '/')\r
 165         || (exefile[0] == '.' && exefile[1] == '.' && exefile[2] == '/')\r
 166                 )\r
 167         {\r
 168                 GeneratePath(exefile, gsCurrentDirectory, sTmpBuffer);\r
 169                 // Check file existence\r
 170                 fd = open(sTmpBuffer, OPENFLAG_EXEC);\r
 171                 if(fd == -1) {\r
 172                         printf("Unknown Command: `%s'\n", Args[0]);     // Error Message\r
 173                         return ;\r
 174                 }\r
 175                 \r
 176                 // Get File info and close file\r
 177                 finfo( fd, &info, 0 );\r
 178                 close( fd );\r
 179                 \r
 180                 // Check if the file is a directory\r
 181                 if(info.flags & FILEFLAG_DIRECTORY) {\r
 182                         printf("`%s' is a directory.\n", sTmpBuffer);\r
 183                         return ;\r
 184                 }\r
 185         }\r
 186         else\r
 187         {\r
 188                  int    i;\r
 189                 \r
 190                 // Check all components of $PATH\r
 191                 for( i = 0; i < giNumPathDirs; i++ )\r
 192                 {\r
 193                         GeneratePath(exefile, gasPathDirs[i], sTmpBuffer);\r
 194                         fd = open(sTmpBuffer, OPENFLAG_EXEC);\r
 195                         if(fd == -1)    continue;\r
 196                         finfo( fd, &info, 0 );\r
 197                         close( fd );\r
 198                         if(info.flags & FILEFLAG_DIRECTORY)     continue;\r
 199                         // Woohoo! We found a valid command\r
 200                         break;\r
 201                 }\r
 202                 \r
 203                 // Exhausted path directories\r
 204                 if( i == giNumPathDirs ) {\r
 205                         printf("Unknown Command: `%s'\n", exefile);\r
 206                         return ;\r
 207                 }\r
 208         }\r
 209         \r
 210         // Create new process\r
 211         pid = clone(CLONE_VM, 0);\r
 212         // Start Task\r
 213         if(pid == 0) {\r
 214                 execve(sTmpBuffer, Args, gasEnvironment);\r
 215                 printf("Execve returned, ... oops\n");\r
 216                 exit(-1);\r
 217         }\r
 218         if(pid <= 0) {\r
 219                 printf("Unable to create process: `%s'\n", sTmpBuffer); // Error Message\r
 220         }\r
 221         else {\r
 222                  int    status;\r
 223                 waittid(pid, &status);\r
 224         }\r
 225 }\r
 226 \r
 227 /**\r
 228  * \fn void Command_Logout(int argc, char **argv)\r
 229  * \brief Exit the shell, logging the user out\r
 230  */\r
 231 void Command_Logout(int argc, char **argv)\r
 232 {\r
 233         exit(0);\r
 234 }\r
 235 \r
 236 /**\r
 237  * \fn void Command_Colour(int argc, char **argv)\r
 238  * \brief Displays the help screen\r
 239  */\r
 240 void Command_Help(int argc, char **argv)\r
 241 {\r
 242         printf( "Acess 2 Command Line Interface\n"\r
 243                 " By John Hodge (thePowersGang / [TPG])\n"\r
 244                 "\n"\r
 245                 "Builtin Commands:\n"\r
 246                 " logout: Return to the login prompt\n"\r
 247                 " exit:   Same\n"\r
 248                 " help:   Display this message\n"\r
 249                 " clear:  Clear the screen\n"\r
 250                 " cd:     Change the current directory\n"\r
 251                 " dir:    Print the contents of the current directory\n");\r
 252         return;\r
 253 }\r
 254 \r
 255 /**\r
 256  * \fn void Command_Clear(int argc, char **argv)\r
 257  * \brief Clear the screen\r
 258  */\r
 259 void Command_Clear(int argc, char **argv)\r
 260 {\r
 261         write(_stdout, "\x1B[2J", 4);   //Clear Screen\r
 262 }\r
 263 \r
 264 /**\r
 265  * \fn void Command_Cd(int argc, char **argv)\r
 266  * \brief Change directory\r
 267  */\r
 268 void Command_Cd(int argc, char **argv)\r
 269 {\r
 270         char    tmpPath[1024];\r
 271         int             fp;\r
 272         t_sysFInfo      stats;\r
 273         \r
 274         if(argc < 2)\r
 275         {\r
 276                 printf("%s\n", gsCurrentDirectory);\r
 277                 return;\r
 278         }\r
 279         \r
 280         GeneratePath(argv[1], gsCurrentDirectory, tmpPath);\r
 281         \r
 282         fp = open(tmpPath, 0);\r
 283         if(fp == -1) {\r
 284                 printf("Directory does not exist\n");\r
 285                 return;\r
 286         }\r
 287         finfo(fp, &stats, 0);\r
 288         close(fp);\r
 289         \r
 290         if( !(stats.flags & FILEFLAG_DIRECTORY) ) {\r
 291                 printf("Not a Directory\n");\r
 292                 return;\r
 293         }\r
 294         \r
 295         free(gsCurrentDirectory);\r
 296         gsCurrentDirectory = malloc(strlen(tmpPath)+1);\r
 297         strcpy(gsCurrentDirectory, tmpPath);\r
 298         \r
 299         // Register change with kernel\r
 300         chdir( gsCurrentDirectory );\r
 301 }\r
 302 \r
 303 /**\r
 304  * \fn void Command_Dir(int argc, char **argv)\r
 305  * \brief Print the contents of a directory\r
 306  */\r
 307 void Command_Dir(int argc, char **argv)\r
 308 {\r
 309          int    dp, fp, dirLen;\r
 310         char    modeStr[11] = "RWXrwxRWX ";\r
 311         char    tmpPath[1024];\r
 312         char    *fileName;\r
 313         t_sysFInfo      info;\r
 314         t_sysACL        acl;\r
 315         \r
 316         // Generate Directory Path\r
 317         if(argc > 1)\r
 318                 dirLen = GeneratePath(argv[1], gsCurrentDirectory, tmpPath);\r
 319         else\r
 320         {\r
 321                 strcpy(tmpPath, gsCurrentDirectory);\r
 322         }\r
 323         dirLen = strlen(tmpPath);\r
 324         \r
 325         // Open Directory\r
 326         dp = open(tmpPath, OPENFLAG_READ);\r
 327         // Check if file opened\r
 328         if(dp == -1)\r
 329         {\r
 330                 printf("Unable to open directory `%s', File cannot be found\n", tmpPath);\r
 331                 return;\r
 332         }\r
 333         // Get File Stats\r
 334         if( finfo(dp, &info, 0) == -1 )\r
 335         {\r
 336                 close(dp);\r
 337                 printf("stat Failed, Bad File Descriptor\n");\r
 338                 return;\r
 339         }\r
 340         // Check if it's a directory\r
 341         if(!(info.flags & FILEFLAG_DIRECTORY))\r
 342         {\r
 343                 close(dp);\r
 344                 printf("Unable to open directory `%s', Not a directory\n", tmpPath);\r
 345                 return;\r
 346         }\r
 347         \r
 348         // Append Shash for file paths\r
 349         if(tmpPath[dirLen-1] != '/')\r
 350         {\r
 351                 tmpPath[dirLen++] = '/';\r
 352                 tmpPath[dirLen] = '\0';\r
 353         }\r
 354         \r
 355         fileName = (char*)(tmpPath+dirLen);\r
 356         // Read Directory Content\r
 357         while( (fp = readdir(dp, fileName)) )\r
 358         {\r
 359                 if(fp < 0)\r
 360                 {\r
 361                         if(fp == -3)\r
 362                                 printf("Invalid Permissions to traverse directory\n");\r
 363                         break;\r
 364                 }\r
 365                 // Open File\r
 366                 fp = open(tmpPath, 0);\r
 367                 if(fp == -1)    continue;\r
 368                 // Get File Stats\r
 369                 finfo(fp, &info, 0);\r
 370                 \r
 371                 if(info.flags & FILEFLAG_DIRECTORY)\r
 372                         printf("d");\r
 373                 else\r
 374                         printf("-");\r
 375                 \r
 376                 // Print Mode\r
 377                 // - Owner\r
 378                 acl.object = info.uid;\r
 379                 _SysGetACL(fp, &acl);\r
 380                 if(acl.perms & 1)       modeStr[0] = 'r';       else    modeStr[0] = '-';\r
 381                 if(acl.perms & 2)       modeStr[1] = 'w';       else    modeStr[1] = '-';\r
 382                 if(acl.perms & 8)       modeStr[2] = 'x';       else    modeStr[2] = '-';\r
 383                 // - Group\r
 384                 acl.object = info.gid | 0x80000000;\r
 385                 _SysGetACL(fp, &acl);\r
 386                 if(acl.perms & 1)       modeStr[3] = 'r';       else    modeStr[3] = '-';\r
 387                 if(acl.perms & 2)       modeStr[4] = 'w';       else    modeStr[4] = '-';\r
 388                 if(acl.perms & 8)       modeStr[5] = 'x';       else    modeStr[5] = '-';\r
 389                 // - World\r
 390                 acl.object = 0xFFFFFFFF;\r
 391                 _SysGetACL(fp, &acl);\r
 392                 if(acl.perms & 1)       modeStr[6] = 'r';       else    modeStr[6] = '-';\r
 393                 if(acl.perms & 2)       modeStr[7] = 'w';       else    modeStr[7] = '-';\r
 394                 if(acl.perms & 8)       modeStr[8] = 'x';       else    modeStr[8] = '-';\r
 395                 printf(modeStr);\r
 396                 close(fp);\r
 397                 \r
 398                 // Colour Code\r
 399                 if(info.flags & FILEFLAG_DIRECTORY)     // Directory: Green\r
 400                         printf("\x1B[32m");\r
 401                 // Default: White\r
 402                 \r
 403                 // Print Name\r
 404                 printf("%s", fileName);\r
 405                 \r
 406                 // Print slash if applicable\r
 407                 if(info.flags & FILEFLAG_DIRECTORY)\r
 408                         printf("/");\r
 409                 \r
 410                 // Revert Colour\r
 411                 printf("\x1B[37m");\r
 412                 \r
 413                 // Newline!\r
 414                 printf("\n");\r
 415         }\r
 416         // Close Directory\r
 417         close(dp);\r
 418 }\r