added ft_strnchr & ft_strrnchr

ft_strnchr.c

@@ -0,0 +1,30 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_strnchr.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: tmaze <tmaze@student.42.fr>                +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2018/05/16 11:41:02 by tmaze             #+#    #+#             */
+/*   Updated: 2018/05/16 11:56:15 by tmaze            ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include <stdio.h>
+#include "libft.h"
+
+char	*ft_strnchr(const char *s, int c, int n)
+{
+	int		i;
+	char	*tmp;
+
+	i = -1;
+	tmp = (char*)s;
+	while ((++i == 0 || tmp[i - 1]) && n > 0 && i < n)
+	{
+		printf("loop %d\nc: %c\ntmp[i]: %c\n", i, c, tmp[i]);
+		if (tmp[i] == c)
+			return (&tmp[i]);
+	}
+	return (NULL);
+}