Added test and doc for dynamic string

1 files changed, 12 insertions, 2 deletions

diff --git a/src/dstr/ft_dstrgrow.c b/src/dstr/ft_dstrgrow.c
index 9ad51ea..40cad86 100644
--- a/src/dstr/ft_dstrgrow.c
+++ b/src/dstr/ft_dstrgrow.c
@@ -6,7 +6,7 @@
 /*   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       */
+/*   Updated: 2020/04/04 19:56:26 by charles          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -14,18 +14,28 @@
 
 #define FT_DSTR_GROWTH_FACTOR 1.5
 
+/*
+** \brief           Grow the capacity of a dynamic string
+** \param dstr      Dynamic string to grow
+** \param at_least  Minimum capacity - 1 required
+** \return          Passed dynamic string or NULL on error
+*/
+
 t_ftdstr	*ft_dstrgrow(t_ftdstr *dstr, size_t at_least)
 {
 	size_t	new_capacity;
 	char	*new_str;
 
+	if (at_least < dstr->capacity - 1)
+		return (dstr);
 	new_capacity = dstr->capacity <= 1 ? 2 : dstr->capacity;
-	while (new_capacity < at_least)
+	while (at_least > new_capacity - 1)
 		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;
+	free(dstr->str);
 	dstr->str = new_str;
 	return (dstr);
 }