1 | //stack.c: |
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2 | |
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3 | /* |
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4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2009-2012 |
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5 | * |
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6 | * This file is part of libroar a part of RoarAudio, |
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7 | * a cross-platform sound system for both, home and professional use. |
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8 | * See README for details. |
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9 | * |
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10 | * This file is free software; you can redistribute it and/or modify |
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11 | * it under the terms of the GNU General Public License version 3 |
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12 | * as published by the Free Software Foundation. |
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13 | * |
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14 | * libroar is distributed in the hope that it will be useful, |
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15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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17 | * GNU General Public License for more details. |
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18 | * |
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19 | * You should have received a copy of the GNU General Public License |
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20 | * along with this software; see the file COPYING. If not, write to |
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21 | * the Free Software Foundation, 51 Franklin Street, Fifth Floor, |
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22 | * Boston, MA 02110-1301, USA. |
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23 | * |
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24 | * NOTE for everyone want's to change something and send patches: |
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25 | * read README and HACKING! There a addition information on |
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26 | * the license of this document you need to read before you send |
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27 | * any patches. |
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28 | * |
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29 | * NOTE for uses of non-GPL (LGPL,...) software using libesd, libartsc |
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30 | * or libpulse*: |
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31 | * The libs libroaresd, libroararts and libroarpulse link this lib |
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32 | * and are therefore GPL. Because of this it may be illigal to use |
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33 | * them with any software that uses libesd, libartsc or libpulse*. |
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34 | */ |
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35 | |
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36 | #include "libroar.h" |
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37 | |
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38 | static void __free(void * v) { |
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39 | roar_mm_free(v); |
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40 | } |
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41 | |
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42 | int roar_stack_new(struct roar_stack * stack) { |
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43 | if ( stack == NULL ) |
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44 | return -1; |
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45 | |
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46 | memset(stack, 0, sizeof(struct roar_stack)); |
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47 | |
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48 | stack->flags = ROAR_STACK_FLAG_FREE_DATA; |
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49 | stack->free = __free; |
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50 | |
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51 | return 0; |
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52 | } |
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53 | |
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54 | struct roar_stack * roar_stack_newalloc(void) { |
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55 | struct roar_stack * stack = roar_mm_malloc(sizeof(struct roar_stack)); |
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56 | |
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57 | if ( stack == NULL ) |
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58 | return NULL; |
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59 | |
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60 | if ( roar_stack_new(stack) == -1 ) { |
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61 | roar_mm_free(stack); |
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62 | return NULL; |
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63 | } |
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64 | |
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65 | if ( roar_stack_set_flag(stack, ROAR_STACK_FLAG_FREE_SELF, 0) == -1 ) { |
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66 | roar_mm_free(stack); |
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67 | return NULL; |
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68 | } |
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69 | |
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70 | return stack; |
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71 | } |
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72 | |
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73 | int roar_stack_free(struct roar_stack * stack) { |
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74 | int i; |
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75 | |
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76 | if ( stack == NULL ) |
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77 | return -1; |
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78 | |
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79 | if ( (stack->flags & ROAR_STACK_FLAG_FREE_DATA) && stack->free != NULL ) { |
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80 | for (i = 0; i < stack->next; i++) |
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81 | stack->free(stack->slot[i]); |
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82 | } |
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83 | |
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84 | if ( stack->flags & ROAR_STACK_FLAG_FREE_SELF ) { |
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85 | roar_mm_free(stack); |
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86 | } else { |
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87 | memset(stack, 0, sizeof(struct roar_stack)); // just to be sure... |
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88 | } |
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89 | |
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90 | return 0; |
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91 | } |
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92 | |
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93 | int roar_stack_set_free(struct roar_stack * stack, void (*func)(void*)) { |
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94 | if ( stack == NULL ) |
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95 | return -1; |
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96 | |
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97 | stack->free = func; |
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98 | |
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99 | return 0; |
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100 | } |
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101 | |
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102 | int roar_stack_set_flag(struct roar_stack * stack, int flag, int reset) { |
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103 | if ( stack == NULL ) |
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104 | return -1; |
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105 | |
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106 | stack->flags |= flag; |
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107 | |
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108 | if ( reset ) |
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109 | stack->flags -= flag; |
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110 | |
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111 | return 0; |
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112 | } |
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113 | |
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114 | int roar_stack_push (struct roar_stack * stack, void * ptr) { |
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115 | if ( stack == NULL ) |
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116 | return -1; |
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117 | |
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118 | if ( stack->next == ROAR_STACK_SIZE ) /* stack is full */ |
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119 | return -1; |
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120 | |
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121 | stack->slot[stack->next++] = ptr; |
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122 | |
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123 | return 0; |
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124 | } |
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125 | |
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126 | int roar_stack_pop (struct roar_stack * stack, void ** ptr) { |
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127 | if ( stack == NULL ) /* it is valid to have ptr = NULL, */ |
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128 | return -1; /* to just pop a value without want to take it */ |
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129 | |
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130 | if ( ptr != NULL ) /* just to be sure */ |
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131 | *ptr = NULL; |
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132 | |
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133 | if ( stack->next == 0 ) /* nothing in stack */ |
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134 | return -1; |
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135 | |
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136 | stack->next--; |
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137 | |
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138 | if ( ptr != NULL ) |
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139 | *ptr = stack->slot[stack->next]; |
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140 | |
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141 | return 0; |
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142 | } |
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143 | |
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144 | int roar_stack_get_cur (struct roar_stack * stack, void ** ptr) { |
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145 | if ( stack == NULL || ptr == NULL ) |
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146 | return -1; |
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147 | |
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148 | *ptr = NULL; /* just to be sure */ |
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149 | |
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150 | if ( stack->next == 0 ) /* nothing in the stack */ |
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151 | return -1; |
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152 | |
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153 | *ptr = stack->slot[stack->next - 1]; |
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154 | |
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155 | return 0; |
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156 | } |
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157 | |
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158 | //ll |
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