Merge mandatory and bonus into a single ft_printf, fix edge cases, add README

- Use the flag-aware implementation for both make and make bonus
  (bonus/ moved to src/, _bonus suffix dropped, bonus rule = all)
- Do not treat zero-length output (%s with "", %.0d with 0) as an error
- Return -1 without printing when a % has no conversion ("abc%", "%5")
- Keep field width with '#', '+' and ' '; ignore '0' with '-'
- Fix '#' prefix on zero, '+'/' ' with zero padding, INT_MIN negation UB
- Add README.md required by the subject

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/ft_printf.c

@@ -6,33 +6,81 @@
 /*   By: dgaillet <dgaillet@student.42.fr>          +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/11/17 10:54:03 by dgaillet          #+#    #+#             */
-/*   Updated: 2025/11/21 14:47:19 by dgaillet         ###   ########lyon.fr   */
+/*   Updated: 2025/11/21 14:59:50 by dgaillet         ###   ########lyon.fr   */
 /*                                                                            */
 /* ************************************************************************** */
 
 #include "ft_printf.h"
 #include <stdarg.h>
+#include <stdlib.h>
 #include <unistd.h>
 
-static int	ft_print_arg(char c, va_list args)
+static int	ft_print_arg_flags(t_arg *arg, va_list args)
 {
-	if (c == 'c')
-		return (print_char(va_arg(args, int)));
-	else if (c == 's')
-		return (print_str(va_arg(args, char *)));
-	else if (c == 'p')
-		return (print_pointer(va_arg(args, unsigned long long)));
-	else if (c == 'd' || c == 'i')
-		return (print_number(va_arg(args, int)));
-	else if (c == 'u')
-		return (print_unsigned(va_arg(args, unsigned int)));
-	else if (c == 'x')
-		return (print_hex(va_arg(args, unsigned int), 0));
-	else if (c == 'X')
-		return (print_hex(va_arg(args, unsigned int), 1));
-	else if (c == '%')
-		return (print_char('%'));
-	return (0);
+	int	count;
+
+	count = 0;
+	if (arg->arg == 'c')
+		count += print_char(arg, va_arg(args, int));
+	else if (arg->arg == 's')
+		count += print_str(arg, va_arg(args, char *));
+	else if (arg->arg == 'p')
+		count += print_pointer(arg, va_arg(args, long long));
+	else if (arg->arg == 'd' || arg->arg == 'i')
+		count += print_number(arg, va_arg(args, int));
+	else if (arg->arg == 'u')
+		count += print_unsigned(arg, va_arg(args, unsigned int));
+	else if (arg->arg == 'x' || arg->arg == 'X')
+		count += print_hex(arg, va_arg(args, unsigned int));
+	else
+		return (-1);
+	if (count < 0)
+		return (-1);
+	count += print_chars(arg->minus - count, ' ');
+	if (count < 0)
+		return (-1);
+	return (count);
+}
+
+static int	ft_print_arg(char *str, va_list args)
+{
+	t_arg	*arg;
+	int		count;
+
+	arg = ft_parsing(str);
+	if (!arg)
+		return (-1);
+	if (arg->arg == '%')
+		count = write(1, "%", 1);
+	else
+		count = ft_print_arg_flags(arg, args);
+	free(arg);
+	return (count);
+}
+
+static int	ft_to_skip(char *str)
+{
+	int	count;
+
+	count = 0;
+	while (!(*str == 'c' || *str == 's' || *str == 'p' || *str == 'd'
+			|| *str == 'i' || *str == 'u' || *str == 'x' || *str == 'X'
+			|| *str == '%') && *str)
+	{
+		count++;
+		str++;
+	}
+	return (count);
+}
+
+static int	handle_arg(const char *s, va_list args, int *i)
+{
+	int	n;
+
+	(*i)++;
+	n = ft_print_arg((char *)&s[*i], args);
+	*i += ft_to_skip((char *)&s[*i]);
+	return (n);
 }
 
 int	ft_printf(const char *first_arg, ...)
@@ -42,22 +90,19 @@ int	ft_printf(const char *first_arg, ...)
 	int		i;
 	int		temp;
 
-	if (!first_arg)
+	if (!first_arg || !ft_check_format(first_arg))
 		return (-1);
 	nb_print = 0;
-	va_start(args, first_arg);
 	i = -1;
+	va_start(args, first_arg);
 	while (first_arg[++i])
 	{
 		temp = nb_print;
-		if (first_arg[i] == '%' && first_arg[i + 1] != '\0')
-		{
-			i++;
-			nb_print += ft_print_arg(first_arg[i], args);
-		}
-		else if (first_arg[i] != '%')
+		if (first_arg[i] == '%')
+			nb_print += handle_arg(first_arg, args, &i);
+		else
 			nb_print += write(1, &first_arg[i], 1);
-		if (temp >= nb_print)
+		if (temp > nb_print)
 			return (-1);
 	}
 	va_end(args);