Usermode/Applications/CLIShell_src/main.c

   1 /*\r
   2  AcessOS Shell Version 2\r
   3 - Based on IOOS CLI Shell\r
   4 */\r
   5 #include <acess/sys.h>\r
   6 #include <stdlib.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    Command_Colour(int argc, char **argv);\r
  17 void    Command_Clear(int argc, char **argv);\r
  18 //void  Command_Ls(int argc, char **argv);\r
  19 void    Command_Cd(int argc, char **argv);\r
  20 //void  Command_Cat(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}, {"cd", Command_Cd}\r
  29 };\r
  30 #define BUILTIN_COUNT   (sizeof(cBUILTINS)/sizeof(cBUILTINS[0]))\r
  31 \r
  32 // ==== LOCAL VARIABLES ====\r
  33 char    gsCommandBuffer[1024];\r
  34 char    *gsCurrentDirectory = "/";\r
  35 char    gsTmpBuffer[1024];\r
  36 char    **gasCommandHistory;\r
  37  int    giLastCommand = 0;\r
  38  int    giCommandSpace = 0;\r
  39 \r
  40 // ==== CODE ====\r
  41 int main(int argc, char *argv[], char *envp[])\r
  42 {\r
  43         char    *sCommandStr;\r
  44         char    *saArgs[32];\r
  45          int    length = 0;\r
  46          int    pid = -1;\r
  47          int    iArgCount = 0;\r
  48          int    bCached = 1;\r
  49         t_sysFInfo      info;\r
  50         \r
  51         //Command_Clear(0, NULL);\r
  52         \r
  53         write(_stdout, 1, "\n");\r
  54         write(_stdout, 36, "Acess Shell Version 3\n");\r
  55         write(_stdout, 30, " Based on CLI Shell for IOOS\n");\r
  56         write(_stdout,  2, "\n");\r
  57         for(;;)\r
  58         {\r
  59                 // Free last command & arguments\r
  60                 if(saArgs[0])   free(saArgs);\r
  61                 if(!bCached)    free(sCommandStr);\r
  62                 bCached = 0;\r
  63                 write(_stdout, strlen(gsCurrentDirectory), gsCurrentDirectory);\r
  64                 write(_stdout, 3, "$ ");\r
  65                 \r
  66                 // Read Command line\r
  67                 sCommandStr = ReadCommandLine( &length );\r
  68                 \r
  69                 // Check if the command should be cached\r
  70                 if(gasCommandHistory == NULL || strcmp(sCommandStr, gasCommandHistory[giLastCommand]) != 0)\r
  71                 {\r
  72                         if(giLastCommand >= giCommandSpace) {\r
  73                                 giCommandSpace += 12;\r
  74                                 gasCommandHistory = realloc(gasCommandHistory, giCommandSpace*sizeof(char*));\r
  75                         }\r
  76                         giLastCommand ++;\r
  77                         gasCommandHistory[ giLastCommand ] = sCommandStr;\r
  78                         bCached = 1;\r
  79                 }\r
  80                 \r
  81                 // Parse Command Line into arguments\r
  82                 Parse_Args(sCommandStr, saArgs);\r
  83                 \r
  84                 // Count Arguments\r
  85                 iArgCount = 0;\r
  86                 while(saArgs[iArgCount])        iArgCount++;\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                 //  [HACK] Mem Usage - Use Length in place of `i'\r
  93                 for(length=0;length<BUILTIN_COUNT;length++)\r
  94                 {\r
  95                         if(strcmp(saArgs[1], cBUILTINS[length].name) == 0)\r
  96                         {\r
  97                                 cBUILTINS[length].fcn(iArgCount-1, &saArgs[1]);\r
  98                                 break;\r
  99                         }\r
 100                 }\r
 101                 \r
 102                 if(length != BUILTIN_COUNT)     continue;\r
 103
 104                 // - Calling a file\r
 105                 GeneratePath(saArgs[1], gsCurrentDirectory, gsTmpBuffer);\r
 106                 // Use length in place of fp\r
 107                 length = open(gsTmpBuffer, 0);\r
 108                 // Check file existence\r
 109                 if(length == -1) {\r
 110                         Print("Unknown Command: `");Print(saArgs[1]);Print("'\n");      // Error Message\r
 111                         continue;\r
 112                 }\r
 113                 // Check if the file is a directory\r
 114                 finfo( length, &info );
 115                 close( length );\r
 116                 if(info.flags & FILEFLAG_DIRECTORY) {\r
 117                         Print("`");Print(saArgs[1]);    // Error Message\r
 118                         Print("' is a directory.\n");\r
 119                         continue;\r
 120                 }\r
 121                 pid = clone(CLONE_VM, 0);\r
 122                 if(pid == 0)    execve(gsTmpBuffer, &saArgs[1], NULL);\r
 123                 if(pid <= 0) {\r
 124                         Print("Unablt to create process: `");Print(gsTmpBuffer);Print("'\n");   // Error Message
 125                         //SysDebug("pid = %i\n", pid);\r
 126                 }\r
 127                 else {\r
 128                          int    status\r
 129                         waitpid(pid, &status);\r
 130                 }\r
 131         }\r
 132 }\r
 133 \r
 134 /**\r
 135  * \fn char *ReadCommandLine(int *Length)\r
 136  * \brief Read from the command line\r
 137  */\r
 138 char *ReadCommandLine(int *Length)\r
 139 {\r
 140         char    *ret;\r
 141          int    len, pos, space = 1023;\r
 142         char    ch;\r
 143          \r
 144         // Preset Variables\r
 145         ret = malloc( space+1 );\r
 146         len = 0;\r
 147         pos = 0;\r
 148                 \r
 149         // Read In Command Line\r
 150         do {\r
 151                 read(_stdin, 1, &ch);   // Read Character from stdin (read is a blocking call)\r
 152                 // Ignore control characters\r
 153                 if(ch < 0)      continue;\r
 154                 // Backspace\r
 155                 if(ch == '\b') {\r
 156                         if(len <= 0)            continue;       // Protect against underflows\r
 157                         if(pos == len) {        // Simple case of end of string\r
 158                                 len --; pos--;\r
 159                         } else {\r
 160                                 memmove(&ret[pos-1], &ret[pos], len-pos);\r
 161                                 pos --;\r
 162                                 len --;\r
 163                         }\r
 164                         write(_stdout, 1, &ch);\r
 165                         continue;\r
 166                 }\r
 167                 // Expand Buffer\r
 168                 if(len > space) {\r
 169                         space += 256;\r
 170                         ret = realloc(ret, space+1);\r
 171                         if(!ret)        return NULL;\r
 172                 }\r
 173                 \r
 174                 write(_stdout, 1, &ch);\r
 175                 ret[pos++] = ch;\r
 176                 len ++;\r
 177         } while(ch != '\n');\r
 178         \r
 179         // Remove newline\r
 180         pos --;\r
 181         ret[pos] = '\0';\r
 182         \r
 183         // Return length\r
 184         if(Length)      *Length = len;\r
 185         \r
 186         return ret;\r
 187 }\r
 188 \r
 189 /**\r
 190  * \fn void Parse_Args(char *str, char **dest)\r
 191  * \brief Parse a string into an argument array\r
 192  */\r
 193 void Parse_Args(char *str, char **dest)\r
 194 {\r
 195          int    i = 1;\r
 196         char    *buf = malloc( strlen(str) + 1 );\r
 197         \r
 198         strcpy(buf, str);\r
 199         dest[0] = buf;\r
 200         \r
 201         // Trim leading whitespace\r
 202         while(*buf == ' ' && *buf)      buf++;\r
 203         \r
 204         for(;;)\r
 205         {\r
 206                 dest[i] = buf;  // Save start of string\r
 207                 i++;\r
 208                 while(*buf && *buf != ' ')\r
 209                 {\r
 210                         if(*buf++ == '"')\r
 211                         {\r
 212                                 while(*buf && !(*buf == '"' && buf[-1] != '\\'))\r
 213                                         buf++;\r
 214                         }\r
 215                 }\r
 216                 if(*buf == '\0')        break;\r
 217                 *buf = '\0';\r
 218                 while(*++buf == ' ' && *buf);\r
 219                 if(*buf == '\0')        break;\r
 220         }\r
 221         dest[i] = NULL;\r
 222         if(i == 1) {\r
 223                 free(buf);\r
 224                 dest[0] = NULL;\r
 225         }\r
 226 }\r
 227 \r
 228 /**\r
 229  * \fn void Command_Colour(int argc, char **argv)\r
 230  * \brief \r
 231  */\r
 232 void Command_Colour(int argc, char **argv)\r
 233 {\r
 234         int fg, bg;\r
 235         char    clrStr[6] = "\x1B[37m";\r
 236         \r
 237         // Verify Arg Count\r
 238         if(argc < 2)\r
 239         {\r
 240                 Print("Please specify a colour\n");\r
 241                 goto usage;\r
 242         }\r
 243         \r
 244         // Check Colour\r
 245         for(fg=0;fg<8;fg++)\r
 246                 if(strcmp(cCOLOUR_NAMES[fg], argv[1]) == 0)\r
 247                         break;\r
 248 \r
 249         // Foreground a valid colour\r
 250         if(fg == 8) {\r
 251                 Print("Unknown Colour '");Print(argv[1]);Print("'\n");\r
 252                 goto usage;\r
 253         }\r
 254         // Set Foreground\r
 255         clrStr[3] = '0' + fg;\r
 256         write(_stdout, 6, clrStr);\r
 257         \r
 258         // Need to Set Background?\r
 259         if(argc > 2)\r
 260         {\r
 261                 for(bg=0;bg<8;bg++)\r
 262                         if(strcmp(cCOLOUR_NAMES[bg], argv[2]) == 0)\r
 263                                 break;\r
 264         \r
 265                 // Valid colour\r
 266                 if(bg == 8)\r
 267                 {\r
 268                         Print("Unknown Colour '");Print(argv[2]);Print("'\n");\r
 269                         goto usage;\r
 270                 }\r
 271         \r
 272                 clrStr[2] = '4';\r
 273                 clrStr[3] = '0' + bg;\r
 274                 write(_stdout, 6, clrStr);\r
 275         }\r
 276         // Return\r
 277         return;\r
 278 \r
 279         // Function Usage (Requested via a Goto (I know it's ugly))\r
 280 usage:\r
 281         Print("Valid Colours are ");\r
 282         for(fg=0;fg<8;fg++)\r
 283         {\r
 284                 Print(cCOLOUR_NAMES[fg]);\r
 285                 write(_stdout, 3, ", ");\r
 286         }\r
 287         write(_stdout, 4, "\b\b\n");\r
 288         return;\r
 289 }\r
 290 \r
 291 void Command_Clear(int argc, char **argv)\r
 292 {\r
 293         write(_stdout, 4, "\x1B[2J");   //Clear Screen\r
 294 }\r
 295 \r
 296 /**\r
 297  * \fn void Command_Cd(int argc, char **argv)\r
 298  * \brief Change directory\r
 299  */\r
 300 void Command_Cd(int argc, char **argv)\r
 301 {\r
 302         char    tmpPath[1024];\r
 303         int             fp;\r
 304         t_sysFInfo      stats;\r
 305         \r
 306         if(argc < 2)\r
 307         {\r
 308                 Print(gsCurrentDirectory);Print("\n");\r
 309                 return;\r
 310         }\r
 311         \r
 312         GeneratePath(argv[1], gsCurrentDirectory, tmpPath);\r
 313         \r
 314         fp = open(tmpPath, 0);\r
 315         if(fp == -1) {\r
 316                 write(_stdout, 26, "Directory does not exist\n");\r
 317                 return;\r
 318         }\r
 319         finfo(fp, &stats);\r
 320         close(fp);\r
 321         \r
 322         if( !(stats.flags & FILEFLAG_DIRECTORY) ) {\r
 323                 write(_stdout, 17, "Not a Directory\n");\r
 324                 return;\r
 325         }\r
 326         \r
 327         strcpy(gsCurrentDirectory, tmpPath);\r
 328 }\r
 329 \r