The basic shell is good to go :)

Author: ajsarmah

headers/utils.h

@@ -2,5 +2,6 @@
 #define _UTILS__H__
 
 void parse_input_string(char* line, char** cmd,int max_args); 
+int parse_built_in_cmd(char **cmd);
 
 #endif

main.c

@@ -11,7 +11,6 @@
 #define STD_OUT 1
 #define ARGS_MAX 20
 
-int status = 1;
 
 int main(int argc, char **argv)
 {
@@ -28,16 +27,19 @@ int main(int argc, char **argv)
 
   printf("\033c");
   printf("Hello %s ;) \n",user);
-  while(status)
+  for(;;)
   {
-   int i = 0;
-   bzero(cmd_with_args,sizeof(cmd_with_args));
-   print_status_line(user,SIZE);
+    int i = 0;
+    bzero(cmd_with_args,sizeof(cmd_with_args));
+    print_status_line(user,SIZE);
     write(STD_OUT,"> ",2);  
     read_user_input(line, STD_IN, SIZE);
     parse_input_string(line,cmd_with_args,ARGS_MAX);
-   execute_command(cmd_with_args);
+    int cmd_status = parse_built_in_cmd(cmd_with_args);
+    if(cmd_status == 0)
+    {
+        execute_command(cmd_with_args);
+    }
   }
-  printf("\033c");
   return 0;
 }

utils.c

@@ -1,4 +1,6 @@
 #include <string.h>
+#include <unistd.h>
+#include <stdlib.h>
 #include <stdio.h>
 #include "utils.h"
 
@@ -15,3 +17,33 @@ void parse_input_string(char* line, char** cmd, int max_args)
     }
     cmd[i + 1] = NULL;
 }
+
+
+int parse_built_in_cmd(char **cmd)
+{
+  int no_of_cmd = 2, i, cmd_no = 0;
+  char* cmd_list[no_of_cmd];
+  cmd_list[0] = "exit";
+  cmd_list[1] = "cd";
+  for(i=0;i<no_of_cmd;i++)
+    {
+      if(strcmp(cmd[0],cmd_list[i]) == 0)
+      {
+        cmd_no = i + 1;
+        break;
+      }
+    }
+  switch(cmd_no)
+    {
+      case 1: 
+        printf("Exiting shell...");
+        printf("\033c");
+        exit(0);
+      case 2:
+        chdir(cmd[1]);
+        return 1;
+      default:
+        break;
+    }
+  return 0;
+}