1/*- 2 * Copyright (c) 1990, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Chris Torek. 7 * 8 * Redistribution and use in source and binary forms, with or without --- 25 unchanged lines hidden (view full) --- 34 * SUCH DAMAGE. 35 */ 36 37#if defined(LIBC_SCCS) && !defined(lint) 38#if 0 39static char sccsid[] = "@(#)fseek.c 8.3 (Berkeley) 1/2/94"; 40#endif 41static const char rcsid[] = |
42 "$FreeBSD: head/lib/libc/stdio/fseek.c 81730 2001-08-15 20:10:38Z ache $"; |
43#endif /* LIBC_SCCS and not lint */ 44 45#include "namespace.h" 46#include <sys/types.h> 47#include <sys/stat.h> |
48#include <errno.h> |
49#include <fcntl.h> |
50#include <limits.h> |
51#include <stdio.h> 52#include <stdlib.h> |
53#include "un-namespace.h" 54#include "local.h" 55#include "libc_private.h" 56 57#define POS_ERR (-(fpos_t)1) 58 59int 60fseek(fp, offset, whence) --- 67 unchanged lines hidden (view full) --- 128 } 129 if (fp->_flags & __SRD) { 130 curoff -= fp->_r; 131 if (HASUB(fp)) 132 curoff -= fp->_ur; 133 } else if (fp->_flags & __SWR && fp->_p != NULL) 134 curoff += fp->_p - fp->_bf._base; 135 |
136 /* curoff always >= 0 */ 137 if (offset > 0 && curoff > OFF_MAX - offset) { |
138 errno = EOVERFLOW; 139 return (EOF); 140 } 141 offset += curoff; 142 /* Disallow negative seeks per POSIX */ 143 if (offset < 0) { 144 errno = EINVAL; 145 return (EOF); --- 45 unchanged lines hidden (view full) --- 191 * We are reading; we can try to optimise. 192 * Figure out where we are going and where we are now. 193 */ 194 if (whence == SEEK_SET) 195 target = offset; 196 else { 197 if (_fstat(fp->_file, &st)) 198 goto dumb; |
199 /* st.st_size always >= 0 */ 200 if (offset > 0 && st.st_size > OFF_MAX - offset) { |
201 errno = EOVERFLOW; 202 return (EOF); 203 } 204 target = st.st_size + offset; 205 /* Disallow negative seeks per POSIX */ 206 if ((off_t)target < 0) { 207 errno = EINVAL; 208 return (EOF); --- 93 unchanged lines hidden --- |