ft_strmapi.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strmapi.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: rdragan <rdragan@student.42heilbronn.de    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/11/05 16:38:55 by rdragan           #+#    #+#             */
/*   Updated: 2022/11/05 16:45:25 by rdragan          ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

/*
Applies the function f to each character of s and
pass it's index as the first argument to create a new string.
The new string will be returned.
@param s: string on which to iterate.
@param f: function to apply.
*/
char	*ft_strmapi(const char *s, char (*f)(unsigned int, char))
{
	char	*new;
	size_t	len;
	size_t	i;

	if (!s)
		return (NULL);
	len = ft_strlen(s);
	new = malloc((len + 1) * sizeof(char));
	if (!new)
		return (NULL);
	i = -1;
	while (s[++i])
	{
		new[i] = f(i, s[i]);
	}
	new[i] = '\0';
	return (new);
}