Mercurial > hg > Papers > 2019 > mitsuki-master

comparison paper/src/fileread.c @ 49:d3ed28a7964f

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update
author mir3636
date Mon, 11 Feb 2019 19:04:56 +0900
parents 675cd2c69450
children
comparison
equal deleted inserted replaced
48:de8210a1f8e4 49:d3ed28a7964f
1 __code cbc_fileread1 (int r) 1 int fileread (struct file *f, char *addr, int n)
2 { 2 {
3 struct file *f = proc->cbc_arg.cbc_console_arg.f; 3 int r;
4 __code (*next)(int ret) = cbc_ret;
5 if (r > 0)
6 f->off += r;
7 iunlock(f->ip);
8 goto next(r);
9 }
10 4
11 __code cbc_fileread (struct file *f, char *addr, int n, __code (*next)(int ret))
12 {
13 if (f->readable == 0) {
14 goto next(-1);
15 }
16
17 if (f->type == FD_PIPE) {
18 goto cbc_piperead(f->pipe, addr, n, next);
19 goto next(-1);
20 }
21
22 if (f->type == FD_INODE) {
23 ilock(f->ip);
24 proc->cbc_arg.cbc_console_arg.f = f;
25 goto cbc_readi(f->ip, addr, f->off, n, cbc_fileread1);
26 }
27
28 goto cbc_panic("fileread");
29 }
30
31 // Read from file f.
32 int fileread (struct file *f, char *addr, int n)
33 {
34 int r;
35
36 if (f->readable == 0) { 5 if (f->readable == 0) {
37 return -1; 6 return -1;
38 } 7 }
39 8
40 if (f->type == FD_PIPE) { 9 if (f->type == FD_PIPE) {
41 return piperead(f->pipe, addr, n); 10 return piperead(f->pipe, addr, n);
42 } 11 }
43 12
44 if (f->type == FD_INODE) { 13 if (f->type == FD_INODE) {
45 ilock(f->ip); 14 ilock(f->ip);
46 15
47 if ((r = readi(f->ip, addr, f->off, n)) > 0) { 16 if ((r = readi(f->ip, addr, f->off, n)) > 0) {
48 f->off += r; 17 f->off += r;
53 return r; 22 return r;
54 } 23 }
55 24
56 panic("fileread"); 25 panic("fileread");
57 } 26 }
58