diff options
| -rw-r--r-- | libio/fileops.c | 23 |
1 files changed, 17 insertions, 6 deletions
diff --git a/libio/fileops.c b/libio/fileops.c index be683cd91e..1a633190c7 100644 --- a/libio/fileops.c +++ b/libio/fileops.c @@ -841,12 +841,23 @@ _IO_new_file_overflow (f, ch) makes room for subsequent output. Otherwise, set the read pointers to _IO_read_end (leaving that alone, so it can continue to correspond to the external position). */ - if (f->_IO_read_ptr == f->_IO_buf_end) - f->_IO_read_end = f->_IO_read_ptr = f->_IO_buf_base; - f->_IO_write_ptr = f->_IO_read_ptr; - f->_IO_write_base = f->_IO_write_ptr; - f->_IO_write_end = f->_IO_buf_end; - f->_IO_read_base = f->_IO_read_ptr = f->_IO_read_end; + if (__builtin_expect (_IO_in_backup (f), 0)) + { + size_t nbackup = f->_IO_read_end - f->_IO_read_ptr; + _IO_free_backup_area (f); + f->_IO_read_base -= MIN (nbackup, + f->_IO_read_base - f->_IO_buf_base); + f->_IO_read_ptr = f->_IO_read_base; + } + else + { + if (f->_IO_read_ptr == f->_IO_buf_end) + f->_IO_read_end = f->_IO_read_ptr = f->_IO_buf_base; + f->_IO_write_ptr = f->_IO_read_ptr; + f->_IO_write_base = f->_IO_write_ptr; + f->_IO_write_end = f->_IO_buf_end; + f->_IO_read_base = f->_IO_read_ptr = f->_IO_read_end; + } f->_flags |= _IO_CURRENTLY_PUTTING; if (f->_mode <= 0 && f->_flags & (_IO_LINE_BUF+_IO_UNBUFFERED)) |