source: mainline/uspace/lib/c/include/imath.h@ e3272101

Last change on this file since e3272101 was e3272101, checked in by Matthieu Riolo <matthieu.riolo@…>, 6 years ago

make ilog10_u64() return an errno_t

The function ilog10_u64() used to return 0
for the value 0. Which is not correct. Either
NaN or -Infinity are correct, but not 0, since
it would be ambiguous with log(1). To ensure this
case the function ilog10_u64() has been changed
to return a errno_t indicating a failure.

  • Property mode set to 100644
File size: 1.7 KB
RevLine 
[9854a8f]1/*
2 * Copyright (c) 2015 Jiri Svoboda
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 *
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * - The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29/** @addtogroup libc
30 * @{
31 */
32/** @file
33 * @brief Integer math functions
34 */
35
36#ifndef LIBC_IMATH_H_
37#define LIBC_IMATH_H_
38
39#include <stdint.h>
40
[b7fd2a0]41extern errno_t ipow10_u64(unsigned, uint64_t *);
[e3272101]42extern errno_t ilog10_u64(uint64_t, unsigned *);
[9854a8f]43
44#endif
45
46/**
47 * @}
48 */
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