#include <stdio.h>

#ifdef _MSC_VER
# include <io.h>   /* for _get_osfhandle _lseek and _locking */
#endif

#ifndef __CEGCC__
# include <sys/locking.h>
#endif /* __CEGCC__ */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif /* HAVE_CONFIG_H */

#include "Evil.h"


#if defined(__CEGCC__)
# define _get_osfhandle get_osfhandle
# elif defined (__MINGW32CE__)
# define _get_osfhandle(FILEDES) ((HANDLE)FILEDES)
#endif /* ! __CEGCC__ && ! __MINGW32CE__ */


/*
 * port of fcntl function
 *
 */

int fcntl(int fd, int cmd, ...)
{
   va_list va;
   HANDLE  h;
   int     res = -1;

   va_start (va, cmd);

   h = (HANDLE)_get_osfhandle(fd);
   if (h == INVALID_HANDLE_VALUE)
     return -1;

   if (cmd == F_SETFD)
     {
        long flag;

        flag = va_arg(va, long);
        if (flag == FD_CLOEXEC)
          {
#if ! ( defined(__CEGCC__) || defined(__MINGW32CE__) )
             if (SetHandleInformation(h, HANDLE_FLAG_INHERIT, 0))
               res = 0;
#endif /* __CEGCC__ || __MINGW32CE__ */
          }
     }
#if ! ( defined(__CEGCC__) || defined(__MINGW32CE__) )
   else if ((cmd == F_SETLK) || (cmd == F_SETLKW))
     {
        struct flock fl;
        off_t        length = 0;
        long         pos;

        fl = va_arg(va, struct flock);

        if (fl.l_len == 0)
          {
             length = _lseek(fd, 0L, SEEK_END);
             if (length != -1L)
               res = 0;
          }
        fl.l_len = length - fl.l_start - 1;

        pos = _lseek(fd, fl.l_start, fl.l_whence);
        if (pos != -1L)
          res = 0;

        if ((fl.l_type == F_RDLCK) || (fl.l_type == F_WRLCK))
          {
             if (cmd == F_SETLK)
               res = _locking(fd, _LK_NBLCK, fl.l_len); /* if cannot be locked, we return immediatly */
             else /* F_SETLKW */
               res = _locking(fd, _LK_LOCK, fl.l_len); /* otherwise, we try several times */
          }

        if (fl.l_type == F_UNLCK)
          res = _locking(fd, _LK_UNLCK, fl.l_len);
     }

#endif /* __CEGCC__ || __MINGW32CE__ */

   va_end(va);

   return res;
}