1 files changed, 89 insertions, 0 deletions
diff --git a/src/errors.c b/src/errors.c
new file mode 100644
index 0000000..63e661e
--- /dev/null
+++ b/src/errors.c
@@ -0,0 +1,89 @@
+/*
+sort_stack Copyright (C) 2026 yctct
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+#include "../include/push_swap.h"
+#include <limits.h>
+
+void	puterror(t_list *src)
+{
+	if (src)
+		free_stack(src);
+	write(1, "Error\n", 6);
+	exit(1);
+}
+
+int	is_dup(t_list *stack)
+{
+	t_list	*first;
+	t_list	*second;
+
+	first = stack;
+	second = stack->next;
+	while (first)
+	{
+		second = first->next;
+		while (second)
+		{
+			if (first->value == second->value)
+				return (1);
+			second = second->next;
+		}
+		first = first->next;
+	}
+	return (0);
+}
+
+int	is_limit_int(t_list *stack)
+{
+	while (stack)
+	{
+		if (stack->value > INT_MAX || stack->value < INT_MIN)
+			return (1);
+		stack = stack->next;
+	}
+	return (0);
+}
+
+int	is_valid_int(char **array)
+{
+	int	j;
+	int	i;
+
+	j = 0;
+	while (array[j])
+	{
+		i = 0;
+		while (array[j][i])
+		{
+			if (array[j][i] == '-' && i == 0)
+				i++;
+			if (array[j][i] < '0' || array[j][i] > '9')
+				return (0);
+			i++;
+		}
+		j++;
+	}
+	return (1);
+}
+
+void	check_errors(t_list *src)
+{
+	if (is_dup(src))
+		puterror(src);
+	if (is_limit_int(src))
+		puterror(src);
+}