1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
|
#include <assert.h>
#include <stdio.h>
#include <unistd.h>
size_t write_fd(FILE *f, const unsigned char *s, size_t l) {
int rc = pwrite(f->fd, s, l, f->offset_in_file);
if (rc == -1) {
f->has_error = 1;
return 0;
}
f->offset_in_file += rc;
return rc;
}
size_t read_fd(FILE *f, unsigned char *s, size_t l) {
int rc = pread(f->fd, s, l, f->offset_in_file);
if (rc == 0)
f->is_eof = 1;
if (rc == -1) {
f->has_error = 1;
return 0;
}
f->offset_in_file += rc;
return rc;
}
int seek_fd(FILE *stream, long offset, int whence) {
switch (whence) {
case SEEK_SET:
stream->offset_in_file = offset;
break;
case SEEK_CUR:
stream->offset_in_file += offset;
break;
case SEEK_END:
stream->offset_in_file = stream->file_size + offset;
break;
default:
assert(0);
break;
}
// FIXME: Error checking
return 0;
}
FILE __stdin_FILE = {
.write = write_fd,
.read = read_fd,
.seek = NULL,
.is_eof = 0,
.has_error = 0,
.cookie = NULL,
.fd = 0,
};
|
