+# elif defined __UCLIBC__ /* uClibc */
+# ifdef __STDIO_BUFFERS
+ if (fp->__modeflags & __FLAG_WRITING)
+ fp->__bufpos = fp->__bufstart;
+ else if (fp->__modeflags & (__FLAG_READONLY | __FLAG_READING))
+ fp->__bufpos = fp->__bufread;
+# endif
+ return 0;
+# elif defined __QNX__ /* QNX */
+ fp->_Rback = fp->_Back + sizeof (fp->_Back);
+ fp->_Rsave = NULL;
+ if (fp->_Mode & 0x2000 /* _MWRITE */)
+ /* fp->_Buf <= fp->_Next <= fp->_Wend */
+ fp->_Next = fp->_Buf;
+ else
+ /* fp->_Buf <= fp->_Next <= fp->_Rend */
+ fp->_Rend = fp->_Next;
+ return 0;
+# elif defined __MINT__ /* Atari FreeMiNT */
+ if (fp->__pushed_back)
+ {
+ fp->__bufp = fp->__pushback_bufp;
+ fp->__pushed_back = 0;
+ }
+ /* Preserve the current file position. */
+ if (fp->__target != -1)
+ fp->__target += fp->__bufp - fp->__buffer;
+ fp->__bufp = fp->__buffer;
+ /* Nothing in the buffer, next getc is nontrivial. */
+ fp->__get_limit = fp->__bufp;
+ /* Nothing in the buffer, next putc is nontrivial. */
+ fp->__put_limit = fp->__buffer;
+ return 0;
+# else
+ #error "Please port gnulib fpurge.c to your platform! Look at the definitions of fflush, setvbuf and ungetc on your system, then report this to bug-gnulib."
+# endif
+