1 files changed, 79 insertions, 0 deletions
diff --git a/libft/ft_atoi.c b/libft/ft_atoi.c
new file mode 100644
index 0000000..8903606
--- /dev/null
+++ b/libft/ft_atoi.c
@@ -0,0 +1,79 @@
+/* ************************************************************************** */
+/*                                                          LE - /            */
+/*                                                              /             */
+/*   ft_atoi.c                                        .::    .:/ .      .::   */
+/*                                                 +:+:+   +:    +:  +:+:+    */
+/*   By: rbousset <marvin@le-101.fr>                +:+   +:    +:    +:+     */
+/*                                                 #+#   #+    #+    #+#      */
+/*   Created: 2019/10/10 05:32:13 by rbousset     #+#   ##    ##    #+#       */
+/*   Updated: 2019/10/15 02:16:20 by rbousset    ###    #+. /#+    ###.fr     */
+/*                                                         /                  */
+/*                                                        /                   */
+/* ************************************************************************** */
+
+#include "libft.h"
+#include <inttypes.h>
+
+static uint8_t
+	ft_isaspace(int c)
+{
+	if (c == '\t' ||
+			c == '\n' ||
+			c == '\v' ||
+			c == '\f' ||
+			c == '\r' ||
+			c == ' ')
+		return (1);
+	return (0);
+}
+
+static int8_t
+	ft_setsign(const char c)
+{
+	int8_t	sign;
+
+	sign = 1;
+	if (c == '-')
+		sign = -1;
+	return (sign);
+}
+
+static uint8_t
+	ft_seti(const char *str)
+{
+	uint8_t	i;
+
+	i = 0;
+	while (ft_isaspace(str[i]))
+		i++;
+	return (i);
+}
+
+int
+	ft_atoi(const char *str)
+{
+	uint8_t	i;
+	int8_t	sign;
+	long	nb;
+
+	if (!str || !*str)
+		return (0);
+	i = ft_seti(str);
+	nb = 0;
+	sign = 1;
+	if (str[i] == '+' || str[i] == '-')
+		sign = ft_setsign(str[i++]);
+	while (ft_isdigit(str[i]))
+	{
+		if (nb * 10 + (str[i] - 48) < nb)
+		{
+			if (sign < 0)
+				return (0);
+			return (-1);
+		}
+		nb = nb * 10 + (str[i] - 48);
+		i++;
+	}
+	nb *= sign;
+	return ((int)nb);
+}