ft_strjoin.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strjoin.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: imunaev- <imunaev-@student.hive.fi>        +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2024/11/07 12:57:30 by imunaev-          #+#    #+#             */
/*   Updated: 2025/01/18 12:39:32 by imunaev-         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

/**
 * @brief Concatenates two strings into a newly allocated string.
 *
 * This function allocates memory and returns a new string that is the result
 * of concatenating the strings `s1` and `s2`. The memory for the new string
 * is obtained using `malloc` and must be freed by the caller.
 *
 * @param s1 The first string to concatenate.
 * @param s2 The second string to concatenate.
 * @return char* A pointer to the newly allocated string containing
 *         the concatenated result of `s1` and `s2`, or NULL if memory
 *         allocation fails.
 */
char	*ft_strjoin(char const *s1, char const *s2)
{
	char	*str;
	size_t	s1_len;
	size_t	s2_len;

	if (!s1 || !s2)
		return (NULL);
	s1_len = ft_strlen(s1);
	s2_len = ft_strlen(s2);
	str = malloc(s1_len + s2_len + 1);
	if (!str)
		return (NULL);
	ft_memcpy(str, s1, s1_len);
	ft_memcpy(str + s1_len, s2, s2_len);
	str[s1_len + s2_len] = '\0';
	return (str);
}