diff options
Diffstat (limited to 'newlib/libc/stdio/fflush.c')
| -rw-r--r-- | newlib/libc/stdio/fflush.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/newlib/libc/stdio/fflush.c b/newlib/libc/stdio/fflush.c index b2bde7af5..ee24cf7ca 100644 --- a/newlib/libc/stdio/fflush.c +++ b/newlib/libc/stdio/fflush.c @@ -80,10 +80,12 @@ _DEFUN(__sflush_r, (ptr, fp), t = fp->_flags; if ((t & __SWR) == 0) { +#ifdef _FSEEK_OPTIMIZATION /* For a read stream, an fflush causes the next seek to be unoptimized (i.e. forces a system-level seek). This conforms to the POSIX and SUSv3 standards. */ fp->_flags |= __SNPT; +#endif /* For a seekable stream with buffered read characters, we will attempt a seek to the current position now. A subsequent read will then get @@ -152,7 +154,9 @@ _DEFUN(__sflush_r, (ptr, fp), { /* Seek successful or ignorable error condition. We can clear read buffer now. */ +#ifdef _FSEEK_OPTIMIZATION fp->_flags &= ~__SNPT; +#endif fp->_r = 0; fp->_p = fp->_bf._base; if ((fp->_flags & __SOFF) && (curoff != -1 || ptr->_errno == 0)) |