#include <fcntl.h>
#include <string.h>

int __fmodeflags(const char* mode) {
  int flags;
  if (strchr(mode, '+'))
    flags = O_RDWR;
  else if (*mode == 'r')
    flags = O_RDONLY;
  else
    flags = O_WRONLY;
  if (strchr(mode, 'x'))
    flags |= O_EXCL;
  if (strchr(mode, 'e'))
    flags |= O_CLOEXEC;
  if (*mode != 'r')
    flags |= O_CREAT;
  if (*mode == 'w')
    flags |= O_TRUNC;
  if (*mode == 'a')
    flags |= O_APPEND;
  return flags;
}