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

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strjoin.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: asalniko <asalniko@student.42berlin.d      +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2025/02/17 16:30:02 by asalniko          #+#    #+#             */
/*   Updated: 2025/04/07 20:18:57 by asalniko         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

size_t	ft_strlen(const char *str)
{
	size_t	i;

	i = 0;
	if (!str)
		return (0);
	while (str[i] != '\0')
		i++;
	return (i);
}

char	*ft_strjoin(char const *s1, char const *s2)
{
	char	*newstr;
	size_t	i;
	size_t	j;

	i = 0;
	j = 0;
	if (!s1 || !s2)
		return (NULL);
	newstr = malloc(ft_strlen(s1) + ft_strlen(s2) + 1);
	if (!newstr)
		return (NULL);
	while (s1[i])
	{
		newstr[i] = s1[i];
		i++;
	}
	while (s2[j])
		newstr[i++] = s2[j++];
	newstr[i] = '\0';
	return (newstr);
}
/*
#include <stdlib.h>
#include <stdio.h>

int main(void)
{
    char *prefix = "abc";
    char *suffix = "def";
    char *result;

    result = ft_strjoin(prefix, suffix);
    if (!result)
    {
        printf("memory allocation failed\n");
        return (1);
    }
    printf("prefix \"%s\" + suffix \"%s\" = \"%s\"\n", prefix, suffix, result);
    free(result);
    return (0);
}*/