Added Dynamic string struct (no test, no doc)

1 files changed, 31 insertions, 0 deletions

diff --git a/src/dstr/ft_dstrgrow.c b/src/dstr/ft_dstrgrow.c
new file mode 100644
index 0000000..9ad51ea
--- /dev/null
+++ b/src/dstr/ft_dstrgrow.c
@@ -0,0 +1,31 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_dstrgrow.c                                      :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: charles <charles.cabergs@gmail.com>        +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2020/04/03 14:17:09 by charles           #+#    #+#             */
+/*   Updated: 2020/04/03 15:09:21 by charles          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft_dstr.h"
+
+#define FT_DSTR_GROWTH_FACTOR 1.5
+
+t_ftdstr	*ft_dstrgrow(t_ftdstr *dstr, size_t at_least)
+{
+	size_t	new_capacity;
+	char	*new_str;
+
+	new_capacity = dstr->capacity <= 1 ? 2 : dstr->capacity;
+	while (new_capacity < at_least)
+		new_capacity *= FT_DSTR_GROWTH_FACTOR;
+	if ((new_str = (char*)malloc(sizeof(char) * new_capacity)) == NULL)
+		return (NULL);
+	ft_memcpy(new_str, dstr->str, dstr->capacity);
+	dstr->capacity = new_capacity;
+	dstr->str = new_str;
+	return (dstr);
+}