ft_strjoin.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strjoin.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: vcodrean <vcodrean@student.42.fr>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/09/21 12:19:52 by vcodrean          #+#    #+#             */
/*   Updated: 2022/10/01 10:17:24 by vcodrean         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

/**
 * It takes two strings, allocates a new string of the appropriate size, 
 * copies the first string into the new string, then copies the second 
 * string into the new string, and returns the new string
 * 
 * param char s1 The first string to be joined.
 * param char s2 The string to be appended to the end of s1.
 * 
 * return A pointer to a new string that is the result of the concatenation 
 * of s1 and s2.
 */
char	*ft_strjoin(char const *s1, char const *s2)
{
	int		i;
	int		len1;
	int		len2;
	char	*str;

	if (s1 && s2)
	{
		len1 = ft_strlen(s1);
		len2 = ft_strlen(s2);
		str = (char *)malloc(sizeof(char) * (len1 + len2 + 1));
		if (str == NULL)
			return (NULL);
		i = -1;
		while (s1[++i])
			str[i] = s1[i];
		i = -1;
		while (s2[++i])
		{
			str[len1] = s2[i];
			len1++;
		}
		str[len1] = '\0';
		return (str);
	}
	return (NULL);
}