ft_strlcat.c

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strlcat.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: rmikhayl <rmikhayl@student.42london.c      +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2023/12/17 17:25:26 by rmikhayl          #+#    #+#             */
/*   Updated: 2023/12/17 17:25:26 by rmikhayl         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */
 
#include "libft.h"
 
/* *************************** ft_strlcat *********************************** */
/*   Combines two text strings, 'dst' and 'src', ensuring the result fits     */
/*   within 'size' characters. Returns the length of the combined text. If    */
/*   something's missing or 'size' is too small, undefined behavoiur.         */
/*                                                                            */
/*   In layman's terms: It's like adding more words to an existing sentence,  */
/*   making sure it doesn't get too long. If there's not enough space or      */
/*   something is missing, it doesn't work right and doesn't give you the     */
/*   correct result.                                                          */
/* ************************************************************************** */
 
size_t  ft_strlcat(char *dst, const char *src, size_t size)
{
    char        *d;
    const char  *s;
    size_t      len_dst;
    size_t      remaining_space;
 
    len_dst = 0;
    s = src;
    d = dst;
    while (size > 0 && *d != '\0')
    {
        d++;
        size--;
        len_dst++;
    }
    remaining_space = size;
    if (remaining_space == 0)
        return (len_dst + ft_strlen(src));
    while (--remaining_space > 0 && *s != '\0')
        *d++ = *s++;
    *d = '\0';
    return (len_dst + ft_strlen(src));
}