1 | /* Generic single linked list to keep various information |
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2 | Copyright (C) 1993, 1994 Free Software Foundation, Inc. |
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3 | |
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4 | Author: Kresten Krab Thorup |
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5 | |
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6 | This file is part of GNU CC. |
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7 | |
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8 | GNU CC is free software; you can redistribute it and/or modify |
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9 | it under the terms of the GNU General Public License as published by |
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10 | the Free Software Foundation; either version 2, or (at your option) |
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11 | any later version. |
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12 | |
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13 | GNU CC is distributed in the hope that it will be useful, |
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14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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16 | GNU General Public License for more details. |
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17 | |
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18 | You should have received a copy of the GNU General Public License |
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19 | along with GNU CC; see the file COPYING. If not, write to |
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20 | the Free Software Foundation, 59 Temple Place - Suite 330, |
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21 | Boston, MA 02111-1307, USA. */ |
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22 | |
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23 | /* As a special exception, if you link this library with files compiled with |
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24 | GCC to produce an executable, this does not cause the resulting executable |
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25 | to be covered by the GNU General Public License. This exception does not |
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26 | however invalidate any other reasons why the executable file might be |
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27 | covered by the GNU General Public License. */ |
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28 | |
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29 | #ifndef __GNU_OBJC_LIST_H |
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30 | #define __GNU_OBJC_LIST_H |
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31 | void * __objc_xrealloc (void *optr, size_t size); |
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32 | void * __objc_xmalloc (size_t size); |
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33 | |
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34 | struct objc_list { |
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35 | void *head; |
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36 | struct objc_list *tail; |
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37 | }; |
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38 | |
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39 | /* Return a cons cell produced from (head . tail) */ |
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40 | |
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41 | static inline struct objc_list* |
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42 | list_cons(void* head, struct objc_list* tail) |
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43 | { |
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44 | struct objc_list* cell; |
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45 | |
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46 | cell = (struct objc_list*)__objc_xmalloc(sizeof(struct objc_list)); |
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47 | cell->head = head; |
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48 | cell->tail = tail; |
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49 | return cell; |
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50 | } |
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51 | |
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52 | /* Return the length of a list, list_length(NULL) returns zero */ |
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53 | |
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54 | static inline int |
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55 | list_length(struct objc_list* list) |
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56 | { |
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57 | int i = 0; |
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58 | while(list) |
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59 | { |
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60 | i += 1; |
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61 | list = list->tail; |
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62 | } |
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63 | return i; |
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64 | } |
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65 | |
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66 | /* Return the Nth element of LIST, where N count from zero. If N |
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67 | larger than the list length, NULL is returned */ |
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68 | |
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69 | static inline void* |
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70 | list_nth(int index, struct objc_list* list) |
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71 | { |
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72 | while(index-- != 0) |
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73 | { |
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74 | if(list->tail) |
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75 | list = list->tail; |
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76 | else |
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77 | return 0; |
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78 | } |
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79 | return list->head; |
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80 | } |
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81 | |
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82 | /* Remove the element at the head by replacing it by its successor */ |
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83 | |
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84 | static inline void |
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85 | list_remove_head(struct objc_list** list) |
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86 | { |
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87 | if ((*list)->tail) |
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88 | { |
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89 | struct objc_list* tail = (*list)->tail; /* fetch next */ |
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90 | *(*list) = *tail; /* copy next to list head */ |
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91 | free(tail); /* free next */ |
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92 | } |
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93 | else /* only one element in list */ |
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94 | { |
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95 | free (*list); |
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96 | (*list) = 0; |
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97 | } |
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98 | } |
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99 | |
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100 | |
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101 | /* Remove the element with `car' set to ELEMENT */ |
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102 | |
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103 | static inline void |
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104 | list_remove_elem(struct objc_list** list, void* elem) |
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105 | { |
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106 | while (*list) { |
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107 | if ((*list)->head == elem) |
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108 | list_remove_head(list); |
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109 | list = &((*list)->tail); |
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110 | } |
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111 | } |
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112 | |
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113 | /* Map FUNCTION over all elements in LIST */ |
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114 | |
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115 | static inline void |
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116 | list_mapcar(struct objc_list* list, void(*function)(void*)) |
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117 | { |
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118 | while(list) |
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119 | { |
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120 | (*function)(list->head); |
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121 | list = list->tail; |
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122 | } |
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123 | } |
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124 | |
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125 | /* Return element that has ELEM as car */ |
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126 | |
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127 | static inline struct objc_list** |
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128 | list_find(struct objc_list** list, void* elem) |
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129 | { |
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130 | while(*list) |
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131 | { |
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132 | if ((*list)->head == elem) |
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133 | return list; |
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134 | list = &((*list)->tail); |
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135 | } |
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136 | return NULL; |
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137 | } |
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138 | |
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139 | /* Free list (backwards recursive) */ |
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140 | |
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141 | static void |
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142 | list_free(struct objc_list* list) |
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143 | { |
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144 | if(list) |
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145 | { |
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146 | list_free(list->tail); |
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147 | free(list); |
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148 | } |
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149 | } |
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150 | #endif __GNU_OBJC_LIST_H |
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