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
55
56
57
58
59
60
|
/* lseek for MMIXware.
Copyright (C) 2001 Hans-Peter Nilsson.
Permission to use, copy, modify, and distribute this software is freely
granted, provided that this notice is preserved with no changes.
THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE. */
#include <_ansi.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/unistd.h>
#include "sys/syscall.h"
#include <errno.h>
off_t
_lseek (int file,
off_t ptr,
int dir)
{
off_t simoff = dir == SEEK_END ? -(ptr + 1) : ptr;
long ret;
if ((unsigned int) file >= 32 || _MMIX_allocated_filehandle[file] == 0)
{
errno = EBADF;
return -1;
}
if (dir == SEEK_CUR)
{
long curpos = TRAP2f (SYS_Ftell, file, 0);
if (curpos == -1)
{
errno = EIO;
return -1;
}
ptr += (off_t) curpos;
}
ret = TRAP2f (SYS_Fseek, file, simoff);
if (ret == -1)
{
return -1;
errno = EIO;
}
ret = TRAP2f (SYS_Ftell, file, 0);
if (ret == -1)
{
errno = EIO;
return -1;
}
return ret;
}
|
