ajout libft en dure

libft/srcs/ft_substr.c

@@ -0,0 +1,104 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_substr.c                                        :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: hulamy <marvin@42.fr>                      +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2019/12/01 16:00:10 by hulamy            #+#    #+#             */
+/*   Updated: 2019/12/09 22:04:26 by hulamy           ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+/*
+** create a copy of a portion of s, begining at start and of length len
+*/
+
+/*
+**	#include <unistd.h>
+**	#include <stdlib.h>
+**	#include <stdio.h>
+**
+**	char	*ft_substr(char const *s, unsigned int start, size_t len);
+**
+**	char	*ft_strdup(const char *src)
+**	{
+**		int		i;
+**		char	*str;
+**
+**		i = 0;
+**		while (src[i] != '\0')
+**			i++;
+**		if (!(str = (char*)malloc(sizeof(*str) * (i + 1))))
+**			return (NULL);
+**		while (i-- >= 0)
+**			str[i + 1] = src[i + 1];
+**		return (str);
+**	}
+**
+**	int		ft_strncmp(const char *s1, const char *s2, size_t n)
+**	{
+**		size_t	i;
+**		int		res;
+**
+**		i = 0;
+**		res = 0;
+**		while (s1[i] && s1[i] == s2[i] && i < n - 1)
+**			i++;
+**		if (n != 0)
+**			res = (unsigned char)s1[i] - (unsigned char)s2[i];
+**		return (res);
+**	}
+**
+**	size_t		ft_strlen(const char *str)
+**	{
+**		size_t i;
+**
+**		i = 0;
+**		while (str[i])
+**			i++;
+**		return (i);
+**	}
+**
+**	int		main(int ac, char **av)
+**	{
+**		char	*str;
+**		size_t	size;
+**		int		start;
+**
+**		str = "frgehr";
+**		start = 2;
+**		size = 5;
+**		if (ac == 4)
+**		{
+**			str = strdup(av[1]);
+**			start = atoi(av[2]);
+**			size = atoi(av[3]);
+**		}
+**		char	*ret = ft_substr(str, start, size);
+**		printf("%s, %i, %zu\n", str, start, size);
+**		printf("%s\n", ret);
+**		free(ret);
+**		return (0);
+**	}
+*/
+
+#include "libft.h"
+
+char	*ft_substr(char const *s, unsigned int start, size_t len)
+{
+	char	*str;
+	size_t	i;
+
+	if (!s)
+		return (NULL);
+	if (ft_strlen(s) < start)
+		return (ft_strdup(""));
+	if (!(str = (char *)malloc(sizeof(char) * (len + 1))))
+		return (NULL);
+	i = 0;
+	while (i < len && s[start])
+		str[i++] = s[start++];
+	str[i] = '\0';
+	return (str);
+}