1 /******************************************************************************
2 *
3 * Common file operations.
4 *
5 * Copyright (c) 2009 by Citrix Systems, Inc. (Patrick Colp)
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; If not, see <http://www.gnu.org/licenses/>.
19 */
20
21
22 #include <unistd.h>
23 #include <xc_private.h>
24
file_op(int fd,void * page,int i,ssize_t (* fn)(int,void *,size_t))25 static int file_op(int fd, void *page, int i,
26 ssize_t (*fn)(int, void *, size_t))
27 {
28 off_t offset = i;
29 int total = 0;
30 int bytes;
31
32 offset = lseek(fd, offset << PAGE_SHIFT, SEEK_SET);
33 if ( offset == (off_t)-1 )
34 return -1;
35
36 while ( total < PAGE_SIZE )
37 {
38 bytes = fn(fd, page + total, PAGE_SIZE - total);
39 if ( bytes <= 0 )
40 return -1;
41
42 total += bytes;
43 }
44
45 return 0;
46 }
47
my_write(int fd,void * buf,size_t count)48 static ssize_t my_write(int fd, void *buf, size_t count)
49 {
50 return write(fd, buf, count);
51 }
52
read_page(int fd,void * page,int i)53 int read_page(int fd, void *page, int i)
54 {
55 return file_op(fd, page, i, &read);
56 }
57
write_page(int fd,void * page,int i)58 int write_page(int fd, void *page, int i)
59 {
60 return file_op(fd, page, i, &my_write);
61 }
62
63
64 /*
65 * Local variables:
66 * mode: C
67 * c-file-style: "BSD"
68 * c-basic-offset: 4
69 * indent-tabs-mode: nil
70 * End:
71 */
72