diff options
Diffstat (limited to 'libio/wfileops.c')
| -rw-r--r-- | libio/wfileops.c | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/libio/wfileops.c b/libio/wfileops.c index c5f0eaf6a7..57ed786a8f 100644 --- a/libio/wfileops.c +++ b/libio/wfileops.c @@ -297,14 +297,34 @@ _IO_wfile_underflow (fp) if (naccbuf == 0) { + if (fp->_IO_read_base < fp->_IO_read_ptr) + { + /* Partially used the buffer for some input data that + produces no output. */ + size_t avail = fp->_IO_read_end - fp->_IO_read_ptr; + memmove (fp->_IO_read_base, fp->_IO_read_ptr, avail); + fp->_IO_read_ptr = fp->_IO_read_base; + fp->_IO_read_end -= avail; + goto again; + } naccbuf = fp->_IO_read_end - fp->_IO_read_ptr; if (naccbuf >= sizeof (accbuf)) goto out_eilseq; memcpy (accbuf, fp->_IO_read_ptr, naccbuf); } - else if (naccbuf == sizeof (accbuf)) - goto out_eilseq; + else + { + size_t used = read_ptr_copy - accbuf; + if (used > 0) + { + memmove (accbuf, read_ptr_copy, naccbuf - used); + naccbuf -= used; + } + + if (naccbuf == sizeof (accbuf)) + goto out_eilseq; + } fp->_IO_read_ptr = fp->_IO_read_end = fp->_IO_read_base; |