libft/ft_strjoin.c at main · andrelucca99/libft · GitHub

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strjoin.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: alucas-e <alucas-e@student.42.fr>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2024/10/21 15:05:17 by alucas-e          #+#    #+#             */
/*   Updated: 2024/10/28 18:07:27 by alucas-e         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

static char	*ft_strcpy(char *dest, const char *src)
{
	int	i;

	i = 0;
	while (src[i])
	{
		dest[i] = src[i];
		i++;
	}
	dest[i] = '\0';
	return (dest);
}

char	*ft_strjoin(char const *s1, char const *s2)
{
	char	*joined_str;
	size_t	len_s1;
	size_t	len_s2;

	if (!s1 || !s2)
		return (NULL);
	len_s1 = ft_strlen(s1);
	len_s2 = ft_strlen(s2);
	joined_str = (char *)malloc(len_s1 + len_s2 + 1);
	if (!joined_str)
		return (NULL);
	ft_strcpy(joined_str, s1);
	ft_strcpy(joined_str + len_s1, s2);
	return (joined_str);
}