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| 1 | +#include <stdio.h> |
| 2 | +#include <stdlib.h> |
| 3 | + |
| 4 | + |
| 5 | +/****** 不要头节点了(头节点不是必须要有的，但是但凡链表一定要有头指针[指向头节点或者首元节点]) ! |
| 6 | +<------------------ |
| 7 | +->0->1-> ... ->99-> |
| 8 | +Tig: 如果没有了头结点，诸如insert delete可能会引起头指针的改变，所以要使用二级指针 **p |
| 9 | +******/ |
| 10 | + |
| 11 | +typedef struct _srlink_data { |
| 12 | + char data; |
| 13 | + struct _srlink_data *next; |
| 14 | +}srlink_data; |
| 15 | + |
| 16 | +static void srlink_show(srlink_data *srldata) |
| 17 | +{ |
| 18 | + srlink_data *srlp = srldata; |
| 19 | + if (!srlp) { |
| 20 | + printf("srlink is not exsit\n"); |
| 21 | + return ; |
| 22 | + } |
| 23 | + |
| 24 | + while (1) { |
| 25 | + printf("%c->", srlp->data); |
| 26 | + if (srlp->next == srldata) { |
| 27 | + break; |
| 28 | + } |
| 29 | + srlp = srlp->next; |
| 30 | + } |
| 31 | + printf("\n"); |
| 32 | +} |
| 33 | + |
| 34 | +static void srlink_init(srlink_data **srldata) |
| 35 | +{ |
| 36 | + *srldata = (srlink_data *)malloc(sizeof(srlink_data)); |
| 37 | + if (!*srldata) { |
| 38 | + printf("srlink malloc failed\n"); |
| 39 | + return ; |
| 40 | + } |
| 41 | + (*srldata)->next = *srldata; |
| 42 | +} |
| 43 | + |
| 44 | +static void srlink_insert(srlink_data **srldata, unsigned int loc, char data) |
| 45 | +{ |
| 46 | + int i = 0; |
| 47 | + static int first_init = 0; |
| 48 | + srlink_data *srlp = *srldata; |
| 49 | + if (!srlp) { |
| 50 | + printf("srlink is not exsit\n"); |
| 51 | + return ; |
| 52 | + } |
| 53 | + |
| 54 | + if (first_init == 0 && loc == 0) { |
| 55 | + srlp->data = data; |
| 56 | + first_init = -1; |
| 57 | + return ; |
| 58 | + } else { |
| 59 | + } |
| 60 | + |
| 61 | + srlink_data *nsrldata = (srlink_data *)malloc(sizeof(srlink_data)); |
| 62 | + if (!nsrldata) { |
| 63 | + printf("nsrldata malloc failed\n"); |
| 64 | + return ; |
| 65 | + } |
| 66 | + nsrldata->data = data; |
| 67 | + |
| 68 | + if (loc == 0) { // 首元位置 |
| 69 | + while (1) { |
| 70 | + if (srlp->next == *srldata) { |
| 71 | + srlp->next = nsrldata; |
| 72 | + nsrldata->next = *srldata; |
| 73 | + *srldata = nsrldata; |
| 74 | + return ; |
| 75 | + } |
| 76 | + srlp = srlp->next; |
| 77 | + } |
| 78 | + } |
| 79 | + |
| 80 | + for (i = 1; i < loc; i++) { |
| 81 | + srlp = srlp->next; |
| 82 | + if (srlp->next == *srldata) { |
| 83 | + printf("insert loc %d is invalid\n", loc); |
| 84 | + return ; |
| 85 | + } |
| 86 | + } |
| 87 | + nsrldata->next = srlp->next; |
| 88 | + srlp->next = nsrldata; |
| 89 | +} |
| 90 | + |
| 91 | +int main() |
| 92 | +{ |
| 93 | + srlink_data *srldata; |
| 94 | + srlink_show(srldata); |
| 95 | + |
| 96 | + srlink_init(&srldata); |
| 97 | + srlink_show(srldata); |
| 98 | + |
| 99 | + srlink_insert(&srldata, 0, 'm'); |
| 100 | + srlink_insert(&srldata, 0, 't'); |
| 101 | + srlink_insert(&srldata, 3, 'e'); |
| 102 | + srlink_insert(&srldata, 2, 'e'); |
| 103 | + srlink_insert(&srldata, 1, 'w'); |
| 104 | + srlink_show(srldata); |
| 105 | +#if 0 |
| 106 | + srlink_delete(); |
| 107 | + srlink_amend(); |
| 108 | + srlink_select(); |
| 109 | +#endif |
| 110 | + |
| 111 | + return 0; |
| 112 | +} |
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