My terminal Program (how to Create a own terminal in c with linux)

#include <stdio.h>

#include <unistd.h>

#include <string.h>

#include <stdlib.h>

#define SIZE 50

#define COMMAND_LEN 1024

int getHostname()

{

                int length;

                char *path = NULL;

                char sysname[SIZE + 1];

                char *user=getenv("USER");

                path = getcwd(NULL, 0);

                return gethostname(sysname, sizeof sysname) == -1 || printf("\n[%s@%s:~%s]-->", user,sysname,path) < 0 ? 1 : 0;

}

int getPath(char path[],char newpath[])

{

                int len=strlen(path),i=3,j=0;

                if ( 3 > len)

                                return 1;

                while (path[i])

                                newpath[j++] = path[i++];

 

                newpath[j++]='\0';

                return 0;

}

 

 

int main()

{

                char command[COMMAND_LEN]={0};

                char cd[SIZE]={0};

                system("clear");

                printf("\n\n\t\t<< << Welcome to my Terminal >> >>\n\n\t\tCreated by Rajesh.S (rajesh@amiindia.co.in)\n\n");

                while(1)

                {

                                getHostname();

                                gets(command);

                                if (strcasecmp(command,"exit")==0)

                                                break;

 

                                if (strcasecmp(command,"su")==0)

                                {

                                                printf("Permission denied!!!");

                                                continue;

                                }

                                if (command[0]=='c' && command[1]=='d')

                                {

                                                if (1 != getPath(command,cd))

                                                                chdir(cd);

                                }

                                else

                                                system(command);

                }

}