ft_strmapi.c

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strmapi.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_strmapi *********************************** */
/*   Applies a given function 'f' to each character of the string 's' along   */
/*   with its index. Returns a new string with the modified characters.       */
/*   If 's' or 'f' is NULL or memory allocation fails, returns NULL.          */
/*                                                                            */
/*   Difference from ft_striteri:                                             */
/*   - This function creates a new string with the modified characters and    */
/*     returns it, while ft_striteri modifies the original string in-place.   */
/*                                                                            */
/*   In layman's terms: It's like reading a text and making changes to each   */
/*   letter while remembering where each letter was originally located.       */
/* ************************************************************************** */
 
char    *ft_strmapi(char const *s, char (*f)(unsigned int, char))
{
    char    *result;
    size_t  len;
    size_t  i;
 
    if (!s || !f)
        return (NULL);
    len = 0;
    while (s[len] != '\0')
        len++;
    result = (char *)malloc((len + 1) * sizeof(char));
    if (!result)
        return (NULL);
    i = 0;
    while (i < len)
    {
        result[i] = f(i, s[i]);
        i++;
    }
    result[len] = '\0';
    return (result);
}