2 * AcessOS Shell Version 3
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4 #include <acess/sys.h>
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14 // ==== PROTOTYPES ====
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15 char *ReadCommandLine(int *Length);
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16 void Parse_Args(char *str, char **dest);
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17 void CallCommand(char **Args);
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18 void Command_Logout(int argc, char **argv);
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19 void Command_Clear(int argc, char **argv);
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20 void Command_Colour(int argc, char **argv);
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21 void Command_Cd(int argc, char **argv);
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22 void Command_Dir(int argc, char **argv);
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24 // ==== CONSTANT GLOBALS ====
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25 char *cCOLOUR_NAMES[8] = {"black", "red", "green", "yellow", "blue", "magenta", "cyan", "white"};
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28 void (*fcn)(int argc, char **argv);
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30 {"exit", Command_Logout}, {"logout", Command_Logout},
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31 {"colour", Command_Colour}, {"clear", Command_Clear},
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32 {"cd", Command_Cd}, {"dir", Command_Dir}
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34 static char *cDEFAULT_PATH[] = {"/Acess/Bin"};
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35 #define BUILTIN_COUNT (sizeof(cBUILTINS)/sizeof(cBUILTINS[0]))
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37 // ==== LOCAL VARIABLES ====
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38 int giNumPathDirs = 1;
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39 char **gasPathDirs = cDEFAULT_PATH;
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40 char **gasEnvironment;
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41 char gsCommandBuffer[1024];
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42 char *gsCurrentDirectory = NULL;
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43 char **gasCommandHistory;
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44 int giLastCommand = 0;
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45 int giCommandSpace = 0;
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48 int main(int argc, char *argv[], char *envp[])
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57 gasEnvironment = envp;
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59 Command_Clear(0, NULL);
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62 char *tmp = getenv("CWD");
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64 gsCurrentDirectory = malloc(strlen(tmp)+1);
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65 strcpy(gsCurrentDirectory, tmp);
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67 gsCurrentDirectory = malloc(2);
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68 strcpy(gsCurrentDirectory, "/");
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72 write(_stdout, 22, "Acess Shell Version 3\n");
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73 write(_stdout, 2, "\n");
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76 // Free last command & arguments
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77 if(saArgs[0]) free(saArgs);
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78 if(!bCached) free(sCommandStr);
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80 write(_stdout, strlen(gsCurrentDirectory), gsCurrentDirectory);
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81 write(_stdout, 3, "$ ");
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83 // Read Command line
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84 sCommandStr = ReadCommandLine( &length );
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87 write(_stdout, 25, "PANIC: Out of heap space\n");
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91 // Check if the command should be cached
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92 if(gasCommandHistory == NULL || strcmp(sCommandStr, gasCommandHistory[giLastCommand]) != 0)
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94 if(giLastCommand >= giCommandSpace) {
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95 giCommandSpace += 12;
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96 gasCommandHistory = realloc(gasCommandHistory, giCommandSpace*sizeof(char*));
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99 gasCommandHistory[ giLastCommand ] = sCommandStr;
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103 // Parse Command Line into arguments
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104 Parse_Args(sCommandStr, saArgs);
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108 while(saArgs[iArgCount]) iArgCount++;
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110 // Silently Ignore all empty commands
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111 if(saArgs[1][0] == '\0') continue;
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113 // Check Built-In Commands
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114 for( i = 0; i < BUILTIN_COUNT; i++ )
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116 if( strcmp(saArgs[1], cBUILTINS[i].name) == 0 )
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118 cBUILTINS[i].fcn(iArgCount-1, &saArgs[1]);
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122 if(i != BUILTIN_COUNT) continue;
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125 CallCommand( &saArgs[1] );
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130 * \fn char *ReadCommandLine(int *Length)
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131 * \brief Read from the command line
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133 char *ReadCommandLine(int *Length)
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136 int len, pos, space = 1023;
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139 // Preset Variables
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140 ret = malloc( space+1 );
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141 if(!ret) return NULL;
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144 // Read In Command Line
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146 read(_stdin, 1, &ch); // Read Character from stdin (read is a blocking call)
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147 // Ignore control characters
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149 read(_stdin, 1, &ch); // Read control character
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152 case 'D': if(pos) pos--; break;
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153 case 'C': if(pos<len) pos++; break;
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155 read(_stdin, 1, &ch); // Read control character
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158 case 'D': if(pos) pos--; break;
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159 case 'C': if(pos<len) pos++; break;
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166 if(len <= 0) continue; // Protect against underflows
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167 if(pos == len) { // Simple case of end of string
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170 memmove(&ret[pos-1], &ret[pos], len-pos);
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174 write(_stdout, 1, &ch);
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180 ret = realloc(ret, space+1);
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181 if(!ret) return NULL;
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184 write(_stdout, 1, &ch);
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187 } while(ch != '\n');
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194 if(Length) *Length = len;
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200 * \fn void Parse_Args(char *str, char **dest)
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201 * \brief Parse a string into an argument array
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203 void Parse_Args(char *str, char **dest)
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206 char *buf = malloc( strlen(str) + 1 );
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210 Print("Parse_Args: Out of heap space!\n");
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217 // Trim leading whitespace
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218 while(*buf == ' ' && *buf) buf++;
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222 dest[i] = buf; // Save start of string
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224 while(*buf && *buf != ' ')
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228 while(*buf && !(*buf == '"' && buf[-1] != '\\'))
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232 if(*buf == '\0') break;
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234 while(*++buf == ' ' && *buf);
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235 if(*buf == '\0') break;
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245 * \fn void CallCommand(char **Args)
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247 void CallCommand(char **Args)
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252 char sTmpBuffer[1024];
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253 char *exefile = Args[0];
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255 if(exefile[0] == '/'
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256 || (exefile[0] == '.' && exefile[1] == '/')
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257 || (exefile[0] == '.' && exefile[1] == '.' && exefile[2] == '/')
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260 GeneratePath(exefile, gsCurrentDirectory, sTmpBuffer);
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261 // Check file existence
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262 fd = open(sTmpBuffer, OPENFLAG_EXEC);
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264 Print("Unknown Command: `");Print(Args[0]);Print("'\n"); // Error Message
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268 // Get File info and close file
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269 finfo( fd, &info, 0 );
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272 // Check if the file is a directory
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273 if(info.flags & FILEFLAG_DIRECTORY) {
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274 Print("`");Print(sTmpBuffer); // Error Message
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275 Print("' is a directory.\n");
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283 // Check all components of $PATH
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284 for( i = 0; i < giNumPathDirs; i++ )
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286 GeneratePath(exefile, gasPathDirs[i], sTmpBuffer);
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287 fd = open(sTmpBuffer, OPENFLAG_EXEC);
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288 if(fd == -1) continue;
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289 finfo( fd, &info, 0 );
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291 if(info.flags & FILEFLAG_DIRECTORY) continue;
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292 // Woohoo! We found a valid command
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296 // Exhausted path directories
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297 if( i == giNumPathDirs ) {
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298 Print("Unknown Command: `");Print(exefile);Print("'\n");
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303 // Create new process
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304 pid = clone(CLONE_VM, 0);
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307 execve(sTmpBuffer, Args, gasEnvironment);
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309 Print("Unablt to create process: `");Print(sTmpBuffer);Print("'\n"); // Error Message
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313 waittid(pid, &status);
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318 * \fn void Command_Logout(int argc, char **argv)
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319 * \brief Exit the shell, logging the user out
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321 void Command_Logout(int argc, char **argv)
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327 * \fn void Command_Clear(int argc, char **argv)
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328 * \brief Clear the screen
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330 void Command_Clear(int argc, char **argv)
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332 write(_stdout, 4, "\x1B[2J"); //Clear Screen
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336 * \fn void Command_Colour(int argc, char **argv)
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337 * \brief Set the colour of the shell prompt
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338 * \note Conflicts with coloured `dir` display
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340 void Command_Colour(int argc, char **argv)
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343 char clrStr[6] = "\x1B[37m";
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345 // Verify Arg Count
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352 for(fg=0;fg<8;fg++)
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353 if(strcmp(cCOLOUR_NAMES[fg], argv[1]) == 0)
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356 // Foreground a valid colour
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358 Print("Unknown Colour '");Print(argv[1]);Print("'\n");
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362 clrStr[3] = '0' + fg;
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363 write(_stdout, 6, clrStr);
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365 // Need to Set Background?
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368 for(bg=0;bg<8;bg++)
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369 if(strcmp(cCOLOUR_NAMES[bg], argv[2]) == 0)
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375 Print("Unknown Colour '");Print(argv[2]);Print("'\n");
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380 clrStr[3] = '0' + bg;
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381 write(_stdout, 6, clrStr);
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386 // Function Usage (Requested via a Goto (I know it's ugly))
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388 Print("Usage: colour <foreground> [<background>]\n");
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389 Print("Valid Colours are ");
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390 for(fg=0;fg<8;fg++)
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392 Print(cCOLOUR_NAMES[fg]);
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393 write(_stdout, 3, ", ");
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395 write(_stdout, 4, "\b\b\n");
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400 * \fn void Command_Cd(int argc, char **argv)
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401 * \brief Change directory
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403 void Command_Cd(int argc, char **argv)
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405 char tmpPath[1024];
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411 Print(gsCurrentDirectory);Print("\n");
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415 GeneratePath(argv[1], gsCurrentDirectory, tmpPath);
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417 fp = open(tmpPath, 0);
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419 write(_stdout, 26, "Directory does not exist\n");
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422 finfo(fp, &stats, 0);
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425 if( !(stats.flags & FILEFLAG_DIRECTORY) ) {
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426 write(_stdout, 17, "Not a Directory\n");
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430 free(gsCurrentDirectory);
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431 gsCurrentDirectory = malloc(strlen(tmpPath)+1);
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432 strcpy(gsCurrentDirectory, tmpPath);
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434 // Register change with kernel
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435 chdir( gsCurrentDirectory );
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439 * \fn void Command_Dir(int argc, char **argv)
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440 * \brief Print the contents of a directory
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442 void Command_Dir(int argc, char **argv)
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444 int dp, fp, dirLen;
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445 char modeStr[11] = "RWXrwxRWX ";
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446 char tmpPath[1024];
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451 // Generate Directory Path
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453 dirLen = GeneratePath(argv[1], gsCurrentDirectory, tmpPath);
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456 strcpy(tmpPath, gsCurrentDirectory);
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458 dirLen = strlen(tmpPath);
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461 dp = open(tmpPath, OPENFLAG_READ);
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462 // Check if file opened
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465 //printf("Unable to open directory `%s', File cannot be found\n", tmpPath);
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466 write(_stdout, 27, "Unable to open directory `");
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467 write(_stdout, strlen(tmpPath)+1, tmpPath);
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468 write(_stdout, 25, "', File cannot be found\n");
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472 if( finfo(dp, &info, 0) == -1 )
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475 write(_stdout, 34, "stat Failed, Bad File Descriptor\n");
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478 // Check if it's a directory
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479 if(!(info.flags & FILEFLAG_DIRECTORY))
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482 write(_stdout, 27, "Unable to open directory `");
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483 write(_stdout, strlen(tmpPath)+1, tmpPath);
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484 write(_stdout, 20, "', Not a directory\n");
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488 // Append Shash for file paths
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489 if(tmpPath[dirLen-1] != '/')
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491 tmpPath[dirLen++] = '/';
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492 tmpPath[dirLen] = '\0';
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495 fileName = (char*)(tmpPath+dirLen);
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496 // Read Directory Content
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497 while( (fp = readdir(dp, fileName)) )
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502 write(_stdout, 42, "Invalid Permissions to traverse directory\n");
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506 fp = open(tmpPath, 0);
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507 if(fp == -1) continue;
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509 finfo(fp, &info, 0);
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511 if(info.flags & FILEFLAG_DIRECTORY)
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512 write(_stdout, 1, "d");
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514 write(_stdout, 1, "-");
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518 acl.group = 0; acl.id = info.uid;
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519 _SysGetACL(fp, &acl);
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520 if(acl.perms & 1) modeStr[0] = 'r'; else modeStr[0] = '-';
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521 if(acl.perms & 2) modeStr[1] = 'w'; else modeStr[1] = '-';
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522 if(acl.perms & 8) modeStr[2] = 'x'; else modeStr[2] = '-';
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524 acl.group = 1; acl.id = info.gid;
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525 _SysGetACL(fp, &acl);
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526 if(acl.perms & 1) modeStr[3] = 'r'; else modeStr[3] = '-';
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527 if(acl.perms & 2) modeStr[4] = 'w'; else modeStr[4] = '-';
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528 if(acl.perms & 8) modeStr[5] = 'x'; else modeStr[5] = '-';
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530 acl.group = 1; acl.id = -1;
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531 _SysGetACL(fp, &acl);
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532 if(acl.perms & 1) modeStr[6] = 'r'; else modeStr[6] = '-';
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533 if(acl.perms & 2) modeStr[7] = 'w'; else modeStr[7] = '-';
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534 if(acl.perms & 8) modeStr[8] = 'x'; else modeStr[8] = '-';
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535 write(_stdout, 10, modeStr);
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539 if(info.flags & FILEFLAG_DIRECTORY) // Directory: Green
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540 write(_stdout, 6, "\x1B[32m");
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544 write(_stdout, strlen(fileName), fileName);
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546 // Print slash if applicable
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547 if(info.flags & FILEFLAG_DIRECTORY)
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548 write(_stdout, 1, "/");
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551 write(_stdout, 6, "\x1B[37m");
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554 write(_stdout, 1, "\n");
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