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libft/ft_int_utils.c

@@ -0,0 +1,80 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_int_utils.c                                     :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: thrieg <thrieg@student.42mulhouse.fr>      +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/10/30 10:11:17 by alier             #+#    #+#             */
+/*   Updated: 2025/02/16 19:03:36 by thrieg           ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include <stdlib.h>
+#include <errno.h>
+#include "libft.h"
+
+size_t	i_drep_len(int n)
+{
+	size_t	len;
+
+	len = 0;
+	if (n < 0)
+		len++;
+	while (1)
+	{
+		len++;
+		n /= 10;
+		if (n == 0)
+			break ;
+	}
+	return (len);
+}
+
+/*
+ * Reimplementation of libc atoi() but sets `errno` to `ERANGE` if an
+ * domain error is encountered (overflow, underflow) or `EINVAL` if
+ * no digits characters or invalid characters at end).
+ */
+int	ft_atoie(const char *nptr)
+{
+	int	n;
+	int	mult;
+
+	n = 0;
+	mult = -1;
+	while (ft_isspace(*nptr))
+		nptr++;
+	if (*nptr == '+' || *nptr == '-')
+	{
+		if (*nptr == '-')
+			mult = 1;
+		nptr++;
+	}
+	if (!ft_isdigit(*nptr))
+		errno = EINVAL;
+	while (ft_isdigit(*nptr))
+	{
+		n = safe_int_sub(safe_int_mul(n, 10), *nptr - '0');
+		nptr++;
+	}
+	if (*nptr != '\0')
+		errno = EINVAL;
+	return (safe_int_mul(n, mult));
+}
+
+unsigned int	ft_max_uint(size_t len, unsigned int a[len])
+{
+	size_t			i;
+	unsigned int	max;
+
+	i = 0;
+	max = 0;
+	while (i < len)
+	{
+		if (a[i] > max)
+			max = a[i];
+		i++;
+	}
+	return (max);
+}