list.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

typedef int T;

typedef struct {
    T* objs;
    size_t nobjs;
    size_t maxobjs;
} T_list;

T_list* T_list_create()
{
    T_list* list = (T_list*) malloc(sizeof(T_list));
    if (list == NULL) exit(111);
    list->objs = NULL;
    list->nobjs = list->maxobjs = 0;
    return list;
}

void T_list_destroy(T_list* list)
{
    if (list->objs != NULL) {
        free(list->objs);
    }
    free(list);
}

void T_list_add(T_list* list, T obj)
{
    if (list->maxobjs <= list->nobjs) {
        list->maxobjs += (list->maxobjs/2)+1;
        list->objs = (T*) realloc(list->objs, sizeof(T) * list->maxobjs);
        if (list->objs == NULL) exit(111);
    }
    list->objs[list->nobjs++] = obj;
}

int main(int argc, char* argv[])
{
    int n = 100;
    T_list* a = T_list_create();
    for (int i = 0; i < n; i++) {
        T_list_add(a, i);
    }
    T_list_destroy(a);
}