add ft_atof

Makefile

@@ -67,8 +67,10 @@ SRCS	=	ft_memset.c \
 			\
 			ft_atoi.c \
 			ft_atol.c \
+			ft_atof.c \
 			ft_itoa.c \
 			ft_utoa.c \
+			ft_atoibase.c \
 			\
 			ft_putchar.c \
 			ft_putstr.c \
@@ -94,7 +96,6 @@ SRCS	=	ft_memset.c \
 			ft_lstcopy.c \
 			\
 			ft_any.c \
-			ft_atoibase.c \
 			ft_convertbase.c \
 			ft_convertbase_free.c \
 			ft_foreach.c \

includes/libft.h

@@ -43,6 +43,7 @@ size_t ft_strlcat(char *dst, const char *src, size_t size);
 char *ft_strnstr(const char *b, const char *l, size_t s);
 int ft_atoi(const char *str);
 long ft_atol(const char *str);
+double ft_atof(const char *str);
 void *ft_calloc(size_t count, size_t size);
 char *ft_strdup(const char *s1);
 

srcs/ft_atof.c

@@ -0,0 +1,42 @@
+#include <stdio.h>
+#include "libft.h"
+
+double ft_atof(const char *str)
+{
+	double nbr;
+	int i;
+	int negatif;
+	double fraction;
+
+	i = 0;
+	negatif = 1;
+	nbr = 0.0;
+	fraction = 1.0;
+
+	// Skip leading whitespace
+	while ((str[i] == ' ') || (str[i] > 8 && str[i] < 14))
+		i++;
+
+	// Handle optional sign
+	if (str[i] == '-')
+		negatif = -1;
+	if (str[i] == '+' || str[i] == '-')
+		i++;
+
+	// Parse integer part
+	while (str[i] >= '0' && str[i] <= '9')
+		nbr = nbr * 10.0 + (str[i++] - '0');
+
+	// Parse fractional part if '.' is present
+	if (str[i] == '.')
+	{
+		i++;
+		while (str[i] >= '0' && str[i] <= '9')
+		{
+			fraction /= 10.0;
+			nbr += (str[i++] - '0') * fraction;
+		}
+	}
+
+	return (nbr * negatif);
+}

srcs/ft_atoi.c

@@ -21,13 +21,20 @@ int		ft_atoi(const char *str)
 	i = 0;
 	negatif = 1;
 	nbr = 0;
+
+	// Skip leading whitespace
 	while ((str[i] == ' ') || (str[i] > 8 && str[i] < 14))
 		i++;
+
+	// Handle optional sign
 	if (str[i] == '-')
 		negatif = -1;
 	if (str[i] == '+' || str[i] == '-')
 		i++;
+
+	// parse integer
 	while (str[i] >= '0' && str[i] <= '9')
 		nbr = nbr * 10 + (str[i++] - '0');
+
 	return (nbr * negatif);
 }

srcs/ft_atol.c

@@ -10,13 +10,20 @@ long	ft_atol(const char *str)
 	i = 0;
 	negatif = 1;
 	nbr = 0;
+
+	// Skip leading whitespace
 	while ((str[i] == ' ') || (str[i] > 8 && str[i] < 14))
 		i++;
+
+	// Handle optional sign
 	if (str[i] == '-')
 		negatif = -1;
 	if (str[i] == '+' || str[i] == '-')
 		i++;
+
+	// parse integer
 	while (str[i] >= '0' && str[i] <= '9')
 		nbr = nbr * 10 + (str[i++] - '0');
+
 	return (nbr * negatif);
 }