Sat, 09 Apr 2022 18:02:53 +0200
#129 - remove test code duplication
1 /*
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
3 *
4 * Copyright 2021 Mike Becker, Olaf Wintermann All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
29 /**
30 * \file utils.h
31 *
32 * \brief General purpose utility functions.
33 *
34 * \author Mike Becker
35 * \author Olaf Wintermann
36 * \version 3.0
37 * \copyright 2-Clause BSD License
38 */
40 #ifndef UCX_UTILS_H
41 #define UCX_UTILS_H
43 #include "common.h"
45 #ifdef __cplusplus
46 extern "C" {
47 #endif
49 #define cx_for_n(varname, n) for (size_t varname = 0 ; (varname) < (n) ; (varname)++)
51 /* ----------------------
52 * cx_szmul() definition.
53 * ---------------------- */
55 #if (__GNUC__ >= 5 || defined(__clang__)) && !defined(CX_NO_SZMUL_BUILTIN)
56 #define CX_SZMUL_BUILTIN
58 #if __WORDSIZE == 32
59 /**
60 * Alias for \c __builtin_umul_overflow.
61 *
62 * Performs a multiplication of size_t values and checks for overflow.
63 *
64 * @param a first operand
65 * @param b second operand
66 * @param result a pointer to a size_t, where the result should
67 * be stored
68 * @return zero, if no overflow occurred and the result is correct, non-zero
69 * otherwise
70 */
71 #define cx_szmul(a, b, result) __builtin_umul_overflow(a, b, result)
72 #else /* __WORDSIZE != 32 */
73 /**
74 * Alias for \c __builtin_umull_overflow.
75 *
76 * Performs a multiplication of size_t values and checks for overflow.
77 *
78 * @param a first operand
79 * @param b second operand
80 * @param result a pointer to a size_t, where the result should
81 * be stored
82 * @return zero, if no overflow occurred and the result is correct, non-zero
83 * otherwise
84 */
85 #define cx_szmul(a, b, result) __builtin_umull_overflow(a, b, result)
86 #endif /* __WORDSIZE */
88 #else /* no GNUC or clang bultin */
90 /**
91 * Performs a multiplication of size_t values and checks for overflow.
92 *
93 * @param a first operand
94 * @param b second operand
95 * @param result a pointer to a size_t, where the result should
96 * be stored
97 * @return zero, if no overflow occurred and the result is correct, non-zero
98 * otherwise
99 */
100 #define cx_szmul(a, b, result) cx_szmul_impl(a, b, result)
102 /**
103 * Performs a multiplication of size_t values and checks for overflow.
104 *
105 * This is a custom implementation in case there is no compiler builtin
106 * available.
107 *
108 * @param a first operand
109 * @param b second operand
110 * @param result a pointer to a size_t where the result should be stored
111 * @return zero, if no overflow occurred and the result is correct, non-zero
112 * otherwise
113 */
114 int cx_szmul_impl(size_t a, size_t b, size_t *result);
116 #endif
118 #ifdef __cplusplus
119 }
120 #endif
122 #endif /* UCX_UTILS_H */