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android_lts_support.c
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1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
13 * distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <math.h>
30#include <errno.h>
31#include <malloc.h>
32#include <stdlib.h>
33
34#ifdef __cplusplus
35 extern "C" {
36#endif
37
38#if __ANDROID_API__ < 17
39
40 int posix_memalign(void** memptr, size_t alignment, size_t size) {
41 if ((alignment & (alignment - 1)) != 0 || alignment == 0) {
42 return EINVAL;
43 }
44
45 if (alignment % sizeof(void*) != 0) {
46 return EINVAL;
47 }
48
49 *memptr = memalign(alignment, size);
50 if (*memptr == NULL) {
51 return errno;
52 }
53
54 return 0;
55}
56
57#endif /* __ANDROID_API__ < 17 */
58
59 double log2(double x) {
60 return (log(x) / M_LN2);
61}
62
63 float log2f(float x) {
64 return (float) log2((double) x);
65}
66
67#ifdef __cplusplus
68}; /* end of extern "C" */
69#endif
log2
double log2(double x)
Definition android_lts_support.c:59
log2f
float log2f(float x)
Definition android_lts_support.c:63
posix_memalign
int posix_memalign(void **memptr, size_t alignment, size_t size)
Definition android_lts_support.c:40