1 /* Copyright (C) 1993,1997,1998,1999,2001,2002 Free Software Foundation, Inc. 2 This file is part of the GNU C Library. 3 4 The GNU C Library is free software; you can redistribute it and/or 5 modify it under the terms of the GNU Lesser General Public 6 License as published by the Free Software Foundation; either 7 version 2.1 of the License, or (at your option) any later version. 8 9 The GNU C Library is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 Lesser General Public License for more details. 13 14 You should have received a copy of the GNU Lesser General Public 15 License along with the GNU C Library; if not, write to the Free 16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 17 02111-1307 USA. 18 19 As a special exception, if you link the code in this file with 20 files compiled with a GNU compiler to produce an executable, 21 that does not cause the resulting executable to be covered by 22 the GNU Lesser General Public License. This exception does not 23 however invalidate any other reasons why the executable file 24 might be covered by the GNU Lesser General Public License. 25 This exception applies to code released by its copyright holders 26 in files containing the exception. */ 27 28 #include <libioP.h> 29 #include <stdlib.h> 30 #include <errno.h> 31 32 _IO_off64_t 33 _IO_seekoff_unlocked (fp, offset, dir, mode) 34 _IO_FILE *fp; 35 _IO_off64_t offset; 36 int dir; 37 int mode; 38 { 39 if (dir != _IO_seek_cur && dir != _IO_seek_set && dir != _IO_seek_end) 40 { 41 __set_errno (EINVAL); 42 return EOF; 43 } 44 45 /* If we have a backup buffer, get rid of it, since the __seekoff 46 callback may not know to do the right thing about it. 47 This may be over-kill, but it'll do for now. TODO */ 48 if (mode != 0 && ((_IO_fwide (fp, 0) < 0 && _IO_have_backup (fp)) 49 || (_IO_fwide (fp, 0) > 0 && _IO_have_wbackup (fp)))) 50 { 51 if (dir == _IO_seek_cur && _IO_in_backup (fp)) 52 { 53 if (fp->_vtable_offset != 0 || fp->_mode <= 0) 54 offset -= fp->_IO_read_end - fp->_IO_read_ptr; 55 else 56 abort (); 57 } 58 if (_IO_fwide (fp, 0) < 0) 59 INTUSE(_IO_free_backup_area) (fp); 60 else 61 INTUSE(_IO_free_wbackup_area) (fp); 62 } 63 64 return _IO_SEEKOFF (fp, offset, dir, mode); 65 } 66 67 68 _IO_off64_t 69 _IO_seekoff (fp, offset, dir, mode) 70 _IO_FILE *fp; 71 _IO_off64_t offset; 72 int dir; 73 int mode; 74 { 75 _IO_off64_t retval; 76 77 _IO_cleanup_region_start ((void (*) __P ((void *))) _IO_funlockfile, fp); 78 _IO_flockfile (fp); 79 80 retval = _IO_seekoff_unlocked (fp, offset, dir, mode); 81 82 _IO_funlockfile (fp); 83 _IO_cleanup_region_end (0); 84 return retval; 85 } 86