ft_printf draft basic

1 files changed, 169 insertions, 0 deletions

diff --git a/ft_printf/ft_printf.c b/ft_printf/ft_printf.c
index c0a262f..d2abc40 100644
--- a/ft_printf/ft_printf.c
+++ b/ft_printf/ft_printf.c
@@ -1,7 +1,176 @@
+#include <unistd.h>
+#include <stdlib.h>
 #include <stdarg.h>
 
+typedef struct
+{
+	int precision;
+	int width;
+	char specifier;
+}	t_format_spec;
+
+void ft_putchar(char c)
+{
+	write(STDOUT_FILENO, &c, 1);
+}
+
+int ft_strlen(char *s)
+{
+	int c;
+
+	c = 0;
+	while (s[c])
+		c++;
+	return (c);
+}
+
+void ft_putstr(char *s)
+{
+	write(STDOUT_FILENO, s, ft_strlen(s));
+}
+
+int ft_isdigit(char c)
+{
+	return (c >= '0' && c <= '9');
+}
+
+int ft_atoi_skip(char **s)
+{
+	int nb;
+	int is_neg;
+
+	is_neg = **s == '-';
+	nb = 0;
+	while (ft_isdigit(**s))
+	{
+		nb *= 10;
+		nb += **s - '0';
+		(*s)++;
+	}
+	return (is_neg ? -nb : nb);
+}
+
+char *parse(char *format, t_format_spec *spec)
+{
+	int tmp;
+
+	if (ft_isdigit(*format))
+		tmp = ft_atoi_skip(&format);
+	if (*format == '.')
+	{
+		spec->precision = tmp;
+		if (ft_isdigit(*++format))
+			spec->width = ft_atoi_skip(&format);
+	}
+	else
+		spec->width = tmp;
+	if (*format != 's' && *format != 'd' && *format != 'x')
+		return (NULL);
+	spec->specifier = *format++;
+	return (format);
+}
+
+int count_digits(int nb, int radix)
+{
+	int counter;
+
+	counter = nb < 0 ? 1 : 0;
+	while (nb > 0)
+	{
+		nb /= radix;
+		counter++;
+	}
+	return (counter);
+}
+
+char *ft_itoa_base(int nb, char *base)
+{
+	int len;
+	int radix;
+	char *s;
+
+	radix = ft_strlen(base);
+	len = count_digits(nb, radix);
+	if ((s = (char*)malloc(sizeof(char) * (len + 1))) == NULL)
+		return (NULL);
+	s[len] = 0;
+	if (nb < 0)
+		s[0] = '-';
+	while (--len >= (nb < 0 ? 1 : 0))
+	{
+		s[len] = base[nb % radix];
+		nb /= radix;
+	}
+	return (s);
+}
+
+int handle_s(va_list ap, t_format_spec *spec)
+{
+	char *tmp;
+
+	tmp = va_arg(ap, char*);
+	ft_putstr(tmp);
+	return (ft_strlen(tmp));
+}
+
+int handle_d(va_list ap, t_format_spec *spec)
+{
+	int tmp;
+	char *s;
+
+	tmp = va_arg(ap, int);
+	s = ft_itoa_base(tmp, "0123456789");
+	ft_putstr(s);
+	return ft_strlen(s);
+}
+
+int handle_x(va_list ap, t_format_spec *spec)
+{
+	int tmp;
+	char *s;
+
+	tmp = va_arg(ap, int);
+	s = ft_itoa_base(tmp, "0123456789abcdef");
+	ft_putstr(s);
+	return ft_strlen(s);
+}
+
+int print_spec(va_list ap, t_format_spec *spec)
+{
+	if (spec->specifier == 's')
+		return (handle_s(ap, spec));
+	else if (spec->specifier == 'd')
+		return (handle_d(ap, spec));
+	else if (spec->specifier == 'x')
+		return (handle_x(ap, spec));
+	else
+		return (-1);
+}
+
 int ft_printf(char *format, ...)
 {
 	va_list ap;
+	int counter;
+	t_format_spec spec;
+
+	va_start(ap, format);
+
 
+	counter = 0;
+	while (*format)
+	{
+		if (*format == '%')
+		{
+			if ((format = parse(format + 1, &spec)) == NULL)
+				return (-1);
+			counter += print_spec(ap, &spec);
+		}
+		else
+		{
+			ft_putchar(*format++);
+			counter++;
+		}
+	}
+	va_end(ap);
+	return (counter);
 }