1 files changed, 90 insertions, 0 deletions
diff --git a/ft_printf.c b/ft_printf.c
new file mode 100644
index 0000000..fc77f81
--- /dev/null
+++ b/ft_printf.c
@@ -0,0 +1,90 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_printf.c                                        :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/03/12 18:18:59 by dkaiser           #+#    #+#             */
+/*   Updated: 2024/03/18 11:42:34 by dkaiser          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "ft_printf.h"
+
+static int	print_char(char c)
+{
+	return (write(1, &c, 1));
+}
+
+static int	print_str(char *str)
+{
+	int	success;
+	int	len;
+
+	if (str)
+	{
+		len = 0;
+		while (str[len])
+			len++;
+		success = write(1, str, len);
+		if (success < 0)
+			return (-1);
+		return (len);
+	}
+	else
+	{
+		success = write(1, "(null)", 6);
+		if (success == 6)
+			return (6);
+		return (-1);
+	}
+}
+
+static int	print_conv(va_list args, char c)
+{
+	if (c == 'c')
+		return (print_char(va_arg(args, int)));
+	if (c == 's')
+		return (print_str(va_arg(args, char *)));
+	if (c == 'p')
+		return (ft_printaddr(va_arg(args, void *)));
+	if (c == 'd' || c == 'i')
+		return (ft_printnbr(va_arg(args, int)));
+	if (c == 'u')
+		return (ft_printunbr(va_arg(args, unsigned int)));
+	if (c == 'x' || c == 'X')
+		return (ft_printhex(va_arg(args, unsigned int), c));
+	if (c == '%')
+		return (print_char('%'));
+	return (-1);
+}
+
+int	ft_printf(const char *fmt, ...)
+{
+	int		result;
+	int		last_result;
+	int		success;
+	va_list	args;
+
+	result = 0;
+	va_start(args, fmt);
+	while (*fmt)
+	{
+		last_result = result;
+		if (*fmt == '%')
+			result += print_conv(args, *(++fmt));
+		else
+		{
+			success = write(1, fmt, 1);
+			if (success <= 0)
+				return (-1);
+			result++;
+		}
+		fmt++;
+		if (result < last_result)
+			return (-1);
+	}
+	va_end(args);
+	return (result);
+}