src/cx/utils.h

Wed, 15 Feb 2023 16:48:11 +0100

author
Mike Becker <universe@uap-core.de>
date
Wed, 15 Feb 2023 16:48:11 +0100
changeset 655
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parent 654
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child 674
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permissions
-rw-r--r--

implement backwards iterator - fixes #238

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1 /*
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2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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3 *
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4 * Copyright 2021 Mike Becker, Olaf Wintermann All rights reserved.
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5 *
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6 * Redistribution and use in source and binary forms, with or without
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7 * modification, are permitted provided that the following conditions are met:
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8 *
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9 * 1. Redistributions of source code must retain the above copyright
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10 * notice, this list of conditions and the following disclaimer.
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11 *
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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26 * POSSIBILITY OF SUCH DAMAGE.
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27 */
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28
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29 /**
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30 * \file utils.h
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31 *
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32 * \brief General purpose utility functions.
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33 *
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34 * \author Mike Becker
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35 * \author Olaf Wintermann
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36 * \version 3.0
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37 * \copyright 2-Clause BSD License
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38 */
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39
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40 #ifndef UCX_UTILS_H
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41 #define UCX_UTILS_H
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42
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43 #include "common.h"
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44
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45 #ifdef __cplusplus
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46 extern "C" {
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47 #endif
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48
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49 /**
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50 * Convenience macro for a for loop that counts from zero to n-1.
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51 */
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52 #define cx_for_n(varname, n) for (size_t varname = 0 ; (varname) < (n) ; (varname)++)
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53
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54 /**
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55 * Convenience macro for swapping two pointers.
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56 */
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57 #ifdef __cplusplus
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58 #define cx_swap_ptr(left, right) do {auto cx_tmp_swap_var = left; left = right; right = cx_tmp_swap_var;} while(0)
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59 #else
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60 #define cx_swap_ptr(left, right) do {void *cx_tmp_swap_var = left; left = right; right = cx_tmp_swap_var;} while(0)
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61 #endif
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62
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63 // cx_szmul() definition
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64
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65 #if (__GNUC__ >= 5 || defined(__clang__)) && !defined(CX_NO_SZMUL_BUILTIN)
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66 #define CX_SZMUL_BUILTIN
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67
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68 /**
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69 * Alias for \c __builtin_mul_overflow.
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70 *
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71 * Performs a multiplication of size_t values and checks for overflow.
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72 *
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73 * @param a first operand
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74 * @param b second operand
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75 * @param result a pointer to a size_t, where the result should
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76 * be stored
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77 * @return zero, if no overflow occurred and the result is correct, non-zero
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78 * otherwise
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79 */
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80 #define cx_szmul(a, b, result) __builtin_mul_overflow(a, b, result)
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81
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82 #else // no GNUC or clang bultin
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83
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84 /**
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85 * Performs a multiplication of size_t values and checks for overflow.
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86 *
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87 * @param a first operand
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88 * @param b second operand
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89 * @param result a pointer to a size_t, where the result should
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90 * be stored
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91 * @return zero, if no overflow occurred and the result is correct, non-zero
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92 * otherwise
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93 */
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94 #define cx_szmul(a, b, result) cx_szmul_impl(a, b, result)
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95
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96 /**
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97 * Performs a multiplication of size_t values and checks for overflow.
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98 *
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99 * This is a custom implementation in case there is no compiler builtin
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100 * available.
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101 *
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102 * @param a first operand
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103 * @param b second operand
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104 * @param result a pointer to a size_t where the result should be stored
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105 * @return zero, if no overflow occurred and the result is correct, non-zero
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106 * otherwise
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107 */
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108 int cx_szmul_impl(size_t a, size_t b, size_t *result);
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109
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110 #endif
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111
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112 #ifdef __cplusplus
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113 }
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114 #endif
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115
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116 #endif // UCX_UTILS_H

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