1 files changed, 73 insertions, 0 deletions
diff --git a/ft_printf.c b/ft_printf.c
new file mode 100644
index 0000000..1058f5b
--- /dev/null
+++ b/ft_printf.c
@@ -0,0 +1,73 @@
+
+// for specifier 'c', we use int because char will be promoted to
+// int anyway
+//
+// we store address of pointer in variable cause variadic
+//
+// ap: argument pointer
+// ap gets incremented on each call
+//
+// a pointer pointing to the first flag/argument
+// format states how many arguments are there
+//
+// va_start initialise the vector argument
+//
+// *format is the whole string printed by printf
+//
+// the last condition of ft_whichspecifier is to deal with 
+// specifier followed by a non-conversion specifier
+
+#include "ft_printf.h"
+
+int	ft_whichspecifier(va_list ap, const char *format)
+{
+	int	counter;
+
+	counter = 0;
+	if (*format == 'c')
+		counter += ft_putchar((char)(va_arg(ap, int)));
+	else if (*format == 's')
+		counter += ft_putstr((va_arg(ap, char *)));
+	else if (*format == 'i' || *format == 'd')
+		counter += ft_putnbr((va_arg(ap, int)));
+	else if (*format == 'u')
+		counter += ft_putunsigned((va_arg(ap, unsigned int)));
+	else if (*format == 'x')
+		counter += ft_puthexlower((va_arg(ap, unsigned int)));
+	else if (*format == 'X')
+		counter += ft_puthexupper((va_arg(ap, unsigned int)));
+	else if (*format == 'p')
+		counter += ft_checkpadd(ap);
+	else if (*format == '%')
+		counter += write(1, "%", 1);
+	else 
+	{
+		counter += write(1, "%", 1);
+		//counter += ft_putchar(*format);
+		counter += write(1, &(*format), 1);
+	}
+	return (counter);
+}
+
+int	ft_printf(const char *format, ...)
+{
+	int		counter;
+	va_list	ap;
+
+	va_start(ap, format);
+	counter = 0;
+	if (!format)
+		return (-1);
+	while (*format)
+	{
+		if (*format == '%')
+		{
+			format++;
+			counter += ft_whichspecifier(ap, format);
+		}
+		else
+			counter += ft_putchar(*format);
+		format++;
+	}
+	return (counter);
+}