+ {
+ off_t pos = lseek (fileno (fp), offset, whence);
+ if (pos == -1)
+ {
+#if defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, MacOS X, Cygwin */
+ fp_->_flags &= ~__SOFF;
+#endif
+ return -1;
+ }
+ else
+ {
+#if defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, MacOS X, Cygwin */
+ fp_->_offset = pos;
+ fp_->_flags |= __SOFF;
+ fp_->_flags &= ~__SEOF;
+#elif defined __EMX__ /* emx+gcc */
+ fp->_flags &= ~_IOEOF;
+#elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, mingw */
+ fp->_flag &= ~_IOEOF;
+#endif
+ return 0;
+ }
+ }