sh-5.2$ cat main.c
#include "list.h"
#include <stdio.h>
size_t find(const list_t *list, int n) {
for(size_t i = 0; i < list_size(list); ++i) {
int x; list_get(list, i, &x, sizeof(x));
if(x == n) return i;
}
return -1;
}
int main(void) {
list_t *list = list_init();
while(1) {
int n; scanf("%d", &n);
if(find(list, n) != -1) break;
list_append(list, &n, sizeof(n));
}
list_deinit(list);
return 0;
}
sh-5.2$ cat list.h
#ifndef _LIST_H_
#define _LIST_H_
#include <stddef.h>
#include <stdbool.h>
struct list_node_tag {
void *data; size_t size;
struct list_node_tag *next;
};
typedef struct {
struct list_node_tag *head;
size_t size;
} list_t;
list_t *list_init(void);
void list_deinit(list_t *list);
bool list_clean(list_t *list);
bool list_insert(list_t *list, size_t index, const void *data, size_t size);
bool list_delete(list_t *list, size_t index);
bool list_get(const list_t *list, size_t index, void *data, size_t size);
bool list_set(list_t *list, size_t index, const void *data, size_t size);
bool list_append(list_t *list, const void *data, size_t size);
size_t list_size(const list_t *list);
bool list_empty(const list_t *list);
#endif
sh-5.2$ cat list.c
#include "list.h"
#include <stdlib.h>
#include <string.h>
static struct list_node_tag *new_node(const void *data, size_t size) {
struct list_node_tag *result = malloc(sizeof(*result));
if(!result) return NULL;
result->data = malloc(size);
if(!result->data) {free(result); return NULL;}
memcpy(result->data, data, size);
result->size = size;
result->next = NULL;
return result;
}
static void free_node(struct list_node_tag *n) {
free(n->data);
free(n);
}
static struct list_node_tag *const *locate_node_const(const list_t *list, size_t index) {
struct list_node_tag *const *result = &list->head;
while(index--) result = &(*result)->next;
return result;
}
static struct list_node_tag **locate_node(list_t *list, size_t index) {
return (struct list_node_tag **)locate_node_const(list, index);
}
list_t *list_init(void) {
list_t *list = malloc(sizeof(*list));
if(!list) return NULL;
list->head = NULL;
list->size = 0;
return list;
}
void list_deinit(list_t *list) {
if(!list) return;
list_clean(list);
free(list);
}
bool list_clean(list_t *list) {
if(!list) return false;
while(!list_empty(list)) if(!list_delete(list, 0)) return false;
return true;
}
bool list_insert(list_t *list, size_t index, const void *data, size_t size) {
if(!list) return false;
if(list_size(list) < index) return false;
if(!data) return false;
struct list_node_tag **current = locate_node(list, index);
struct list_node_tag *node = new_node(data, size);
if(!node) return false;
node->next = *current;
*current = node;
++list->size;
return true;
}
bool list_delete(list_t *list, size_t index) {
if(!list) return false;
if(list_size(list) <= index) return false;
struct list_node_tag **current = locate_node(list, index);
struct list_node_tag *temp = *current;
*current = temp->next;
free_node(temp);
--list->size;
return true;
}
bool list_get(const list_t *list, size_t index, void *data, size_t size) {
if(!list) return false;
if(list_size(list) <= index) return false;
if(!data) return false;
struct list_node_tag *current = *locate_node_const(list, index);
if(current->size > size) return false;
memcpy(data, current->data, current->size);
return true;
}
bool list_set(list_t *list, size_t index, const void *data, size_t size) {
bool res = list_delete(list, index);
return res ? list_insert(list, index, data, size) : res;
}
bool list_append(list_t *list, const void *data, size_t size) {
if(!list) return false;
return list_insert(list, list_size(list), data, size);
}
size_t list_size(const list_t *list) {
if(!list) return 0;
return list->size;
}
bool list_empty(const list_t *list) {
if(!list) return true;
return list_size(list) == 0;
}
sh-5.2$ ./main
1 2 3
1
sh-5.2$