libft/ft_strjoin.c at master · knzeng-e/libft · GitHub

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strjoin.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: knzeng-e <[email protected]>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2016/03/21 20:06:48 by knzeng-e          #+#    #+#             */
/*   Updated: 2016/04/01 01:35:22 by knzeng-e         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

static int	ft_size(char const *s)
{
	int	i;

	i = 0;
	while (s[i])
		i++;
	return (i);
}

char		*ft_strjoin(char const *s1, char const *s2)
{
	char	*join;
	int		i;
	int		j;

	if (!s1 || !s2)
		return (NULL);
	i = ft_size(s1) + ft_size(s2);
	if (!(join = (char *)malloc(sizeof(char) * (i + 1))))
		return (NULL);
	i = 0;
	while (s1[i])
	{
		join[i] = s1[i];
		i++;
	}
	j = 0;
	while (s2[j])
	{
		join[i + j] = s2[j];
		j++;
	}
	join[i + j] = '\0';
	return (join);
}