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annotate src/libmlk-core/core/action-stack.c @ 392:e6d7ebad33cc

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core: don't use fixed arrays in action_stack
author David Demelier <markand@malikania.fr>
date Tue, 15 Feb 2022 20:47:47 +0100
parents 460c78706989
children b0579ae033ed
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1 /*
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2 * action-stack.h -- convenient stack of actions
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3 *
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4 * Copyright (c) 2020-2022 David Demelier <markand@malikania.fr>
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5 *
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6 * Permission to use, copy, modify, and/or distribute this software for any
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7 * purpose with or without fee is hereby granted, provided that the above
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8 * copyright notice and this permission notice appear in all copies.
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9 *
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10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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17 */
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18
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19 #include <assert.h>
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20 #include <string.h>
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21
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22 #include "action.h"
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23 #include "action-stack.h"
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24
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25 #define ACTION_FOREACH(st, iter) \
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26 for (size_t i = 0; i < (st)->actionsz && ((iter) = (st)->actions[i], 1); ++i)
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27
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28 void
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29 action_stack_init(struct action_stack *st, struct action **actions, size_t actionsz)
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30 {
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31 assert(st);
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32
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33 st->actions = actions;
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34 st->actionsz = actionsz;
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35
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36 for (size_t i = 0; i < st->actionsz; ++i)
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37 st->actions[i] = NULL;
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38 }
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39
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40 int
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41 action_stack_add(struct action_stack *st, struct action *act)
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42 {
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43 assert(st);
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44 assert(act);
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45
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46 for (size_t i = 0; i < st->actionsz; ++i) {
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47 if (!st->actions[i]) {
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48 st->actions[i] = act;
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49 return 0;
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50 }
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51 }
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52
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53 return -1;
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54 }
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55
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56 void
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57 action_stack_handle(struct action_stack *st, const union event *ev)
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58 {
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59 assert(st);
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60 assert(ev);
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61
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62 struct action *act;
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63
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64 ACTION_FOREACH(st, act)
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65 if (act)
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66 action_handle(act, ev);
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67 }
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68
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69 int
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70 action_stack_update(struct action_stack *st, unsigned int ticks)
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71 {
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72 assert(st);
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73
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74 struct action *act;
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75
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76 for (size_t i = 0; i < st->actionsz; ++i) {
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77 act = st->actions[i];
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78
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79 if (act && action_update(act, ticks)) {
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80 action_end(act);
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81 action_finish(act);
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82 st->actions[i] = NULL;
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83 }
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84 }
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85
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86 /*
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87 * We process all actions again in case the user modified the stack
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88 * within their update function.
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89 */
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90 return action_stack_completed(st);
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91 }
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92
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93 void
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94 action_stack_draw(const struct action_stack *st)
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95 {
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96 assert(st);
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97
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98 struct action *act;
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99
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100 ACTION_FOREACH(st, act)
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101 if (act)
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102 action_draw(act);
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103 }
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104
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105 int
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106 action_stack_completed(const struct action_stack *st)
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107 {
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108 assert(st);
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109
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110 struct action *act;
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111
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112 ACTION_FOREACH(st, act)
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113 if (act)
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114 return 0;
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115
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116 return 1;
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117 }
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118
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119 void
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120 action_stack_finish(struct action_stack *st)
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121 {
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122 assert(st);
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123
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124 struct action *act;
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125
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126 ACTION_FOREACH(st, act) {
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127 if (act) {
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128 action_end(act);
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129 action_finish(act);
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130 }
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131 }
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132
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133 memset(st, 0, sizeof (*st));
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134 }