diff options
Diffstat (limited to 'libio/iofopen.c')
| -rw-r--r-- | libio/iofopen.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/libio/iofopen.c b/libio/iofopen.c index 4bb780de13..c1681a4a10 100644 --- a/libio/iofopen.c +++ b/libio/iofopen.c @@ -53,7 +53,9 @@ __fopen_maybe_mmap (fp) if (_IO_SYSSTAT (fp, &st) == 0 && S_ISREG (st.st_mode) && st.st_size != 0 /* Limit the file size to 1MB for 32-bit machines. */ - && (sizeof (ptrdiff_t) > 4 || st.st_size < 1*1024*1024)) + && (sizeof (ptrdiff_t) > 4 || st.st_size < 1*1024*1024) + /* Sanity check. */ + && (fp->_offset == _IO_pos_BAD || fp->_offset <= st.st_size)) { /* Try to map the file. */ void *p; @@ -72,15 +74,17 @@ __fopen_maybe_mmap (fp) underflow functions which never tries to read anything from the file. */ INTUSE(_IO_setb) (fp, p, (char *) p + st.st_size, 0); - _IO_setg (fp, p, p, p); + + if (fp->_offset == _IO_pos_BAD) + fp->_offset = 0; + + _IO_setg (fp, p, p + fp->_offset, p + fp->_offset); if (fp->_mode <= 0) _IO_JUMPS ((struct _IO_FILE_plus *) fp) = &_IO_file_jumps_mmap; else _IO_JUMPS ((struct _IO_FILE_plus *) fp) = &_IO_wfile_jumps_mmap; fp->_wide_data->_wide_vtable = &_IO_wfile_jumps_mmap; - - fp->_offset = 0; } } } |