/******************************************************************************/
/*                                                                            */
/* GetUserName - this function will return the user name of the user running  */
/*               the program.  Check USER first!                              */
/*                                                                            */
/*    returns a pointer to the user name                                      */
/*                                                                            */
/******************************************************************************/

#include <stdlib.h>         /* for getenv */
#include <unistd.h>
#include <sys/types.h>
#include <sys/utsname.h>    /* for uname */
#include <string.h>
#include <pwd.h>

char *GetUserName () 
{
    static char user_name_str [30];
    struct passwd *user_name;
    uid_t user_id;

    if (getenv ("USER") == NULL) {
        user_id = geteuid ();
        user_name = getpwuid (user_id);
        strcpy (user_name_str, user_name->pw_name);
    } else {
        strcpy (user_name_str, getenv ("USER"));
    }
    return user_name_str;
}