/******************************************************************************/
/*                                                                            */
/* 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>
#if !defined (__MINGW32__) && !defined (__MSVCRT__)
#include <sys/utsname.h>    /* for uname */
#include <pwd.h>
#else
#include <windows.h>
#endif
#include <string.h>

#if !defined (__MINGW32__) && !defined (__MSVCRT__)
char *GetUserName () 
#else
char *SDDAS_GetUserName () 
#endif
{
    static char user_name_str [30];
#if !defined (__MINGW32__) && !defined (__MSVCRT__)
    struct passwd *user_name;
    uid_t user_id;
#else
    DWORD len = sizeof (user_name_str);
#endif

    strcpy (user_name_str, "unknown"); /* default value */

    if (getenv ("USER") == NULL) {
#if !defined (__MINGW32__) && !defined (__MSVCRT__)
        user_id = geteuid ();
        user_name = getpwuid (user_id);
        strncpy (user_name_str, user_name->pw_name, 29);
#else
        GetUserName (user_name_str, &len);
#endif
    } else {
        strncpy (user_name_str, getenv ("USER"), 29);
    }
    return user_name_str;
}