vec_append.c

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   vec_append.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: tspoof <tspoof@student.hive.fi>            +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/12/12 22:48:37 by tspoof            #+#    #+#             */
/*   Updated: 2022/12/15 19:47:14 by tspoof           ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */
 
#include "vec.h"
 
// Appends src memory to end of dst memory.
// Resizes the dst memory if needed.
int vec_append(t_vec *dst, t_vec *src)
{
    size_t  alloc_size_min;
    int     ret;
 
    if (!dst || !src)
        return (-1);
    ret = 1;
    alloc_size_min = dst->len * dst->elem_size + src->len * src->elem_size;
    if (dst->alloc_size * 2 < alloc_size_min)
        ret = vec_resize(dst, dst->len + src->len);
    else if (dst->alloc_size < alloc_size_min)
        ret = vec_resize(dst, (dst->alloc_size / dst->elem_size) * 2);
    if (ret == -1)
        return (-1);
    ft_memcpy(&dst->memory[dst->elem_size * dst->len],
        src->memory,
        src->len * src->elem_size);
    dst->len = dst->len + src->len;
    return (1);
}