Last change
on this file since 444 was
444,
checked in by satin@…, 6 years ago
|
add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
|
File size:
1.3 KB
|
Line | |
---|
1 | /* read for MMIXware. |
---|
2 | |
---|
3 | Copyright (C) 2001 Hans-Peter Nilsson |
---|
4 | |
---|
5 | Permission to use, copy, modify, and distribute this software is |
---|
6 | freely granted, provided that the above copyright notice, this notice |
---|
7 | and the following disclaimer are preserved with no changes. |
---|
8 | |
---|
9 | THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR |
---|
10 | IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED |
---|
11 | WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
---|
12 | PURPOSE. */ |
---|
13 | |
---|
14 | #include <_ansi.h> |
---|
15 | #include <sys/types.h> |
---|
16 | #include <sys/stat.h> |
---|
17 | #include "sys/syscall.h" |
---|
18 | #include <errno.h> |
---|
19 | |
---|
20 | int |
---|
21 | _read (int file, |
---|
22 | char *ptr, |
---|
23 | size_t len) |
---|
24 | { |
---|
25 | long ret; |
---|
26 | |
---|
27 | if ((unsigned int) file >= 32 || _MMIX_allocated_filehandle[file] == 0) |
---|
28 | { |
---|
29 | errno = EBADF; |
---|
30 | return -1; |
---|
31 | } |
---|
32 | |
---|
33 | if (isatty(file)) |
---|
34 | { |
---|
35 | ret = TRAP3f (SYS_Fgets, file, ptr, len); |
---|
36 | |
---|
37 | if (ret == -1) |
---|
38 | return 0; |
---|
39 | |
---|
40 | return ret; |
---|
41 | } |
---|
42 | |
---|
43 | ret = TRAP3f (SYS_Fread, file, ptr, len); |
---|
44 | |
---|
45 | /* Map the return codes: |
---|
46 | -1-len: an error. We return -1. |
---|
47 | 0: success. We return len. |
---|
48 | n-len: end-of-file after n chars read. We return n. */ |
---|
49 | if (ret == 0) |
---|
50 | return len; |
---|
51 | |
---|
52 | if (ret == -1 - (long) len) |
---|
53 | { |
---|
54 | /* We don't know the nature of the failure, so this is an |
---|
55 | approximation. */ |
---|
56 | errno = EIO; |
---|
57 | return -1; |
---|
58 | } |
---|
59 | |
---|
60 | return ret + len; |
---|
61 | } |
---|
Note: See
TracBrowser
for help on using the repository browser.