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The Android Open Source Projectdd7bc332009-03-03 19:32:55 -08001/*
2 * Copyright (C) 2007 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef HAVE_SYS_UIO_H
18
19#include <cutils/uio.h>
20#include <unistd.h>
21
22int readv( int fd, struct iovec* vecs, int count )
23{
24 int total = 0;
25
26 for ( ; count > 0; count--, vecs++ ) {
27 const char* buf = vecs->iov_base;
28 int len = vecs->iov_len;
29
30 while (len > 0) {
31 int ret = read( fd, buf, len );
32 if (ret < 0) {
33 if (total == 0)
34 total = -1;
35 goto Exit;
36 }
37 if (ret == 0)
38 goto Exit;
39
40 total += ret;
41 buf += ret;
42 len -= ret;
43 }
44 }
45Exit:
46 return total;
47}
48
49int writev( int fd, const struct iovec* vecs, int count )
50{
51 int total = 0;
52
53 for ( ; count > 0; count--, vecs++ ) {
54 const char* buf = (const char*)vecs->iov_base;
55 int len = (int)vecs->iov_len;
56
57 while (len > 0) {
58 int ret = write( fd, buf, len );
59 if (ret < 0) {
60 if (total == 0)
61 total = -1;
62 goto Exit;
63 }
64 if (ret == 0)
65 goto Exit;
66
67 total += ret;
68 buf += ret;
69 len -= ret;
70 }
71 }
72Exit:
73 return total;
74}
75
76#endif /* !HAVE_SYS_UIO_H */