improve: change behaviour of ft_ca2ia and add comment

Author: 42lan

sources/conversions/ft_ca2ia.c

@@ -6,28 +6,34 @@
 /*   By: amalsago <[email protected]>          +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2020/02/21 23:53:51 by amalsago          #+#    #+#             */
-/*   Updated: 2020/02/22 01:22:04 by amalsago         ###   ########.fr       */
+/*   Updated: 2020/02/23 11:41:57 by amalsago         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
 #include "libft.h"
 
+/*
+** ft_ca2ia() allocates enough memory to store integers extracted from a given
+** array of chars.
+** The first element of `char_array` will be at the last position of `int_array`
+**
+** Example:
+**    Given char_array = ["1", "2", "3", "4", "5"]
+**    Calling ft_ca2ia(char_array) return int_array = [5, 4, 3, 2, 1]
+*/
+
 int				*ft_ca2ia(char **char_array)
 {
 	int			i;
 	int			array_size;
 	int			*int_array;
 
-	i = -1;
+	i = 0;
 	array_size = ft_arraysize(char_array);
 	if (!(int_array = (int *)ft_memalloc(sizeof(int) * array_size)))
 		return (NULL);
 	--array_size;
 	while (array_size >= 0)
-	{
-		++i;
-		--array_size;
-		int_array[i] = ft_atoi(char_array[i]);
-	}
+		int_array[i++] = ft_atoi(char_array[array_size--]);
 	return (int_array);
 }