ft_strmapi: initial implementation

ft_strmapi.c

@@ -0,0 +1,66 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_strmapi.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: kcolin <marvin@42.fr>                      +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/10/18 11:34:37 by kcolin            #+#    #+#             */
+/*   Updated: 2024/10/18 11:52:51 by kcolin           ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft.h"
+#include <stdlib.h>
+
+char	*ft_strmapi(char const *s, char (*f)(unsigned int, char))
+{
+	unsigned int	i;
+	char			*out;
+
+	out = ft_calloc(ft_strlen(s) + 1, sizeof(char));
+	if (out == NULL)
+		return (NULL);
+	i = 0;
+	while (s[i] != '\0')
+	{
+		out[i] = (*f)(i, s[i]);
+		i++;
+	}
+	return (out);
+}
+
+/*
+#include <stdio.h>
+
+char	upcase_some_letters(unsigned int i, char c)
+{
+	if (i % 2 == 0)
+		return (ft_toupper(c));
+	else
+		return (ft_tolower(c));
+}
+
+
+int	main(int argc, char **argv)
+{
+	if (argc > 1)
+	{
+		int	i = 1;
+
+		while (i < argc)
+		{
+			char	*out = ft_strmapi(argv[i], &upcase_some_letters);
+			printf("%d\t'%s'\n", i, out);
+			free(out);
+			i++;
+		}
+		return (0);
+	}
+	else
+	{
+		printf("Usage: %s <text...>\n", argv[0]);
+		return (1);
+	}
+}
+*/