ft_strjoin.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strjoin.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: msousa <mlrcbsousa@gmail.com>              +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2021/01/16 04:18:01 by msousa            #+#    #+#             */
/*   Updated: 2021/01/20 00:22:31 by msousa           ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include <stdlib.h>

char		*ft_strcat(char *dest, char *src)
{
	while (*src)
	{
		*dest = *src;
		dest++;
		src++;
	}
	return (dest);
}

long long	ft_strlen(char *str)
{
	long long	length;

	length = 0;
	while (*str++)
		length++;
	return (length);
}

char		*empty_string(void)
{
	char *str;

	str = (char*)malloc(sizeof(*str));
	*str = '\0';
	return (str);
}

char		*ft_strjoin(int size, char **strs, char *sep)
{
	char		*str;
	char		*tmp;
	int			index;
	long long	total;

	if (!size)
		return (empty_string());
	total = 0;
	index = 0;
	while (index < size)
		total += ft_strlen(strs[index++]);
	str = (char*)malloc(total + ft_strlen(sep) * (size - 1) + 1);
	tmp = ft_strcat(str, strs[0]);
	index = 1;
	while (index < size)
	{
		tmp = ft_strcat(tmp, sep);
		tmp = ft_strcat(tmp, strs[index++]);
	}
	*tmp = '\0';
	return (str);
}