list

gistfile1.c

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

typedef struct LIST{
    struct LIST *next;
    struct LIST *prev;
    char *str;
}List;

void help();
char* get(List *list, int index);
List* push(List *list, char *str);
List* new(char *str);

char* get(List *list, int index)
{
    int i;
    for(i=0;i<index;i++)
    {
        if((list = list->next) == NULL)
        {
            fprintf(stderr, "Index Out of Range Exception\n\tindex:%d is out of range(%d).\n", index, i);
            exit(EXIT_FAILURE);
        }
    }
    return list->str;
}
List* new(char *str)
{
    List *list = (List *)malloc(sizeof(List));
    list->str = str;
    return list;
}
List* push(List *list, char *str)
{
    List *l = list;
    if(list == NULL) return new(str);
    while(list->next != NULL)
    {
        list = list->next;
    }
    list->next = (List *)malloc(sizeof(List));
    list->next->str = str;
    list->next->prev = list;
    return l;
}

void p(List *list)
{
    int i = 0;
    printf("-----\n");
    while(list != NULL)
    {
        printf("%d : %s \n", i++, list->str);
        list = list->next;
    }
    printf("-----\n");
}

int main(int argc, char *argv[])
{
    int i;
    List *list;

    list = push(list, "test1");
    p(list);
    list = push(list, "test2");
    p(list);
    list = push(list, "test3");
    p(list);
    exit(EXIT_SUCCESS);
}