gl_del_element.c

/*
** EPITECH PROJECT, 2021
** CPP_D02A
** File description:
** del_element.c
*/

#include <unistd.h>
#include <stdbool.h>
#include <stdlib.h>

#include "generic_list.h"

bool list_del_elem_at_front(list_t *front_ptr)
{
    list_t tmp;

    if (*front_ptr == NULL)
        return (false);
    tmp = (*front_ptr)->next;
    free(*front_ptr);
    *front_ptr = tmp;
    return (true);
}

bool list_del_elem_at_back(list_t *front_ptr)
{
    list_t *prev = front_ptr;
    list_t tmp;

    if (*front_ptr == NULL)
        return (false);
    tmp = (*front_ptr)->next;
    while (tmp != NULL) {
        prev = &(*prev)->next;
        tmp = tmp->next;
    }
    free(*prev);
    *prev = NULL;
    return (true);
}

bool list_del_elem_at_position(list_t *front_ptr, unsigned int position)
{
    list_t *prev = front_ptr;
    list_t tmp;

    if (*front_ptr == NULL)
        return (false);
    tmp = (*front_ptr)->next;
    for (unsigned ctr = 0; ctr < position; ctr += 1) {
        if (tmp == NULL)
            return (false);
        prev = &(*prev)->next;
        tmp = tmp->next;
    }
    free(*prev);
    *prev = tmp;
    return (true);
}