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-rw-r--r--libio/fileops.c23
1 files changed, 17 insertions, 6 deletions
diff --git a/libio/fileops.c b/libio/fileops.c
index be683cd..1a63319 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))