ft_strmapi.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strmapi.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: antandre <antandre@student.42barcel>       +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2024/06/17 10:48:04 by antandre          #+#    #+#             */
/*   Updated: 2024/06/17 14:34:57 by antandre         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include <stdlib.h>
#include "libft.h"

/*
 * Applies the function 'f' to each character of the string
 * 's', passing its index as the first argument and the
 * character itself as the second argument. A new string
 * (allocated using malloc(3)) is created to collect
 * the results of the successive applications of 'f'.
 */

char	*ft_strmapi(char const *s, char (*f)(unsigned int, char))
{
	unsigned int	i;
	char			*result;

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