| 1 | #include <stdio.h> |
| 2 | #include <stdlib.h> |
| 3 | #include <stdbool.h> |
| 4 | |
| 5 | #include "clist.h" |
| 6 | |
| 7 | link_t* list_new(int value) { |
| 8 | link_t* link_new; |
| 9 | link_new = malloc(sizeof(link_t)); |
| 10 | link_new->value = value; |
| 11 | link_new->next = NULL; |
| 12 | return link_new; |
| 13 | } |
| 14 | |
| 15 | link_t* list_append(link_t* head, int value) { |
| 16 | |
| 17 | if (head == NULL) { |
| 18 | return head = list_new(value); |
| 19 | } else { |
| 20 | link_t* head_first = head; |
| 21 | while (head->next != NULL) { |
| 22 | head = head->next; |
| 23 | } |
| 24 | head->next = list_new(value); |
| 25 | return head_first; |
| 26 | } |
| 27 | } |
| 28 | |
| 29 | link_t* list_prepend(link_t* head, int value) { |
| 30 | link_t* first_link = list_new(value); |
| 31 | |
| 32 | first_link->next = head; |
| 33 | return first_link; |
| 34 | } |
| 35 | |
| 36 | link_t* list_insert(link_t* head, unsigned index, int value) { |
| 37 | |
| 38 | if (index == 0) { |
| 39 | return list_prepend(head, value); |
| 40 | } else if (index == list_count(head)) { |
| 41 | return list_append(head, value); |
| 42 | } else { |
| 43 | link_t* link_insrt = list_new(value); |
| 44 | link_t* head_first = head; |
| 45 | link_t* head_next = NULL; |
| 46 | for (unsigned i = 0; i < index-1; i++) { |
| 47 | head = head->next; |
| 48 | } |
| 49 | head_next = head->next; |
| 50 | head->next = link_insrt; |
| 51 | head = link_insrt; |
| 52 | head->next = head_next; |
| 53 | return head_first; |
| 54 | } |
| 55 | } |
| 56 | |
| 57 | link_t* list_delete(link_t* head, unsigned index) { |
| 58 | link_t* head_prev = NULL; |
| 59 | link_t* head_next = NULL; |
| 60 | link_t* head_ret = NULL; |
| 61 | |
| 62 | if (head == NULL) { |
| 63 | return NULL; |
| 64 | } else if (index == 0) { |
| 65 | head_next = head->next; |
| 66 | free(head); |
| 67 | head = head_next; |
| 68 | head_ret = head; |
| 69 | } else { |
| 70 | link_t* head_first = head; |
| 71 | for (unsigned i = 0; i < index-1; i++) { |
| 72 | head = head->next; |
| 73 | } |
| 74 | head_prev = head; |
| 75 | head = head->next; |
| 76 | head_next = head->next; |
| 77 | free(head); |
| 78 | head = head_prev; |
| 79 | head->next = head_next; |
| 80 | head_ret = head_first; |
| 81 | } |
| 82 | if (head_ret != NULL) { |
| 83 | return head_ret; |
| 84 | } else { |
| 85 | return NULL; |
| 86 | } |
| 87 | } |
| 88 | |
| 89 | link_t* list_concat(link_t* first, link_t* second) { |
| 90 | link_t* head_first = first; |
| 91 | |
| 92 | while (first->next != NULL) { |
| 93 | first = first->next; |
| 94 | } |
| 95 | first->next = second; |
| 96 | return head_first; |
| 97 | } |
| 98 | |
| 99 | link_t* list_sort(link_t* head) { |
| 100 | int tmp; |
| 101 | bool isswaped; |
| 102 | link_t* head_first = head; |
| 103 | |
| 104 | do { |
| 105 | isswaped = false; |
| 106 | while (head->next != NULL) { |
| 107 | if (head->value > head->next->value) { |
| 108 | tmp = head->value; |
| 109 | head->value = head->next->value; |
| 110 | head->next->value = tmp; |
| 111 | isswaped = true; |
| 112 | } |
| 113 | head = head->next; |
| 114 | } |
| 115 | /* Reloop at the beginning of the list until there's values swaped */ |
| 116 | head = head_first; |
| 117 | } while (isswaped); |
| 118 | return head_first; |
| 119 | } |
| 120 | |
| 121 | static link_t* _list_merge_sort(link_t* head1, link_t* head2) { |
| 122 | link_t* head_result = NULL; |
| 123 | |
| 124 | if (head1 == NULL) { |
| 125 | return head2; |
| 126 | } |
| 127 | if (head2 == NULL) { |
| 128 | return head1; |
| 129 | } |
| 130 | if (head1->value < head2->value) { |
| 131 | head_result = head1; |
| 132 | head_result->next = _list_merge_sort(head1->next, head2); |
| 133 | } else { |
| 134 | head_result = head2; |
| 135 | head_result->next = _list_merge_sort(head1, head2->next); |
| 136 | } |
| 137 | return head_result; |
| 138 | } |
| 139 | |
| 140 | link_t* list_merge_sort(link_t* head) { |
| 141 | link_t* head1; |
| 142 | link_t* head2; |
| 143 | |
| 144 | if (head == NULL || head->next == NULL) { |
| 145 | return head; |
| 146 | } |
| 147 | |
| 148 | head1 = head; |
| 149 | head2 = head->next; |
| 150 | while (head2 != NULL && head2->next != NULL) { |
| 151 | head = head->next; |
| 152 | head2 = head->next->next; |
| 153 | } |
| 154 | head2 = head->next; |
| 155 | head->next = NULL; |
| 156 | |
| 157 | head1 = list_merge_sort(head1); |
| 158 | head2 = list_merge_sort(head2); |
| 159 | return _list_merge_sort(head1, head2); |
| 160 | } |
| 161 | |
| 162 | unsigned list_count(link_t* head) { |
| 163 | unsigned count = 0; |
| 164 | |
| 165 | while (head != NULL) { |
| 166 | ++count; |
| 167 | head = head->next; |
| 168 | } |
| 169 | return count; |
| 170 | } |
| 171 | |
| 172 | void list_set(link_t* head, unsigned index, int value) { |
| 173 | unsigned count = 0; |
| 174 | |
| 175 | while (head != NULL && count < index) { |
| 176 | ++count; |
| 177 | head = head->next; |
| 178 | } |
| 179 | if (head != NULL) { head->value = value; } |
| 180 | } |
| 181 | |
| 182 | int list_get(link_t* head, unsigned index) { |
| 183 | unsigned count = 0; |
| 184 | |
| 185 | while (head != NULL && count < index) { |
| 186 | ++count; |
| 187 | head = head->next; |
| 188 | } |
| 189 | if (head != NULL) { |
| 190 | return head->value; |
| 191 | } else { |
| 192 | return -1; |
| 193 | } |
| 194 | } |
| 195 | |
| 196 | void list_clear(link_t* head) { |
| 197 | link_t* next_link = NULL; |
| 198 | |
| 199 | while (head != NULL) { |
| 200 | next_link = head->next; |
| 201 | free(head); |
| 202 | head = next_link; |
| 203 | } |
| 204 | } |
| 205 | |
| 206 | void list_display_values(link_t* head) { |
| 207 | unsigned i = 0; |
| 208 | |
| 209 | printf("------Begin------\n"); |
| 210 | while (head != NULL) { |
| 211 | printf("value at [%d]=%d\n", i, head->value); |
| 212 | head = head->next; |
| 213 | i++; |
| 214 | } |
| 215 | printf("------End------\n"); |
| 216 | } |