libft/ft_strjoin.c at master · zainabdnaya/libft · GitHub

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strjoin.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: zdnaya <zdnaya@student.42.fr>              +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2019/10/22 10:06:34 by zdnaya            #+#    #+#             */
/*   Updated: 2019/11/11 15:34:58 by zdnaya           ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

char	*ft_strjoin(char const *s1, char const *s2)
{
	char				*s3;
	char				*str1;
	char				*str2;
	unsigned int		len;

	if (!s1 || !s2)
	{
		return (NULL);
	}
	str1 = (char *)s1;
	str2 = (char *)s2;
	len = 0;
	s3 = (char *)malloc(ft_strlen(str1) + ft_strlen(str2) + 1);
	if (s3 == NULL)
		return (NULL);
	while (*str1)
		s3[len++] = *(str1++);
	while (*str2)
		s3[len++] = *(str2++);
	s3[len] = '\0';
	return (s3);
}