🧪 Unit Test Update – Character Functions

🎯 Gameplay Fixes (a.k.a. Function Corrections)
	•	🔧 ft_isascii has been rebalanced: now consistently returns 1 for values within the ASCII range (0–127), instead of leaking the raw character value.
	•	🔧 ft_isprint has been patched: returns 1 only for printable characters (32–126), aligning with the standard library.

➡️ These fixes bring our character classification system fully in line with the C standard behavior. No more unfair RNG in return values!

⸻

🆕 New Content (a.k.a. Fresh Test Files)
	•	📜 test_isascii.c – Exhaustively tests ft_isascii vs isascii across values 0–128.
	•	📜 test_isprint.c – Pits ft_isprint against isprint across the same range.
	•	📜 test_tolower.c – Validates ft_tolower against tolower.
	•	📜 test_toupper.c – Validates ft_toupper against toupper.

⸻

⚡ Impact
	•	Consistent, predictable behavior for all classification and transformation functions.
	•	A stronger, more reliable unit test suite to guard against future regressions.
	•	Confidence boost for upcoming boss fights (👀 the rest of libft).

char/ft_isascii.c

@@ -6,7 +6,7 @@
 /*   By: rparodi <marvin@42.fr>                     +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2023/11/06 14:04:26 by rparodi           #+#    #+#             */
-/*   Updated: 2025/09/04 11:41:42 by rparodi          ###   ########.fr       */
+/*   Updated: 2025/09/05 10:40:03 by rparodi          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -21,6 +21,6 @@ int	ft_isascii(int c)
 	if (c == 0)
 		return (1);
 	if (c > 0 && c <= 127)
-		return (c);
+		return (1);
 	return (0);
 }

char/ft_isprint.c

@@ -6,7 +6,7 @@
 /*   By: rparodi <marvin@42.fr>                     +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2023/11/06 14:06:53 by rparodi           #+#    #+#             */
-/*   Updated: 2025/09/04 11:41:49 by rparodi          ###   ########.fr       */
+/*   Updated: 2025/09/05 10:44:13 by rparodi          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -19,6 +19,6 @@
 int	ft_isprint(int c)
 {
 	if (c >= 32 && c <= 126)
-		return (c);
+		return (1);
 	return (0);
 }

test/char/test_isascii.c

@@ -0,0 +1,36 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   test_isascii.c                                     :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: rparodi <rparodi@student.42.fr>            +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/09/04 16:54:42 by rparodi           #+#    #+#             */
+/*   Updated: 2025/09/05 10:40:18 by rparodi          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "char.h"
+#include "color.h"
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+int	main(void)
+{
+	unsigned char	c;
+
+	c = 0;
+	while (c <= 128)
+	{
+		if (ft_isascii(c) != isascii(c))
+		{
+			printf("%s✘ Found %i, excepted %i%s\n", CLR_RED, ft_isascii(c),
+				isascii(c), RESET);
+			exit(1);
+		}
+		else
+			printf("%s✔%s ", CLR_GREEN, RESET);
+		c++;
+	}
+}

test/char/test_isprint.c

@@ -0,0 +1,36 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   test_isprint.c                                     :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: rparodi <rparodi@student.42.fr>            +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/09/04 16:54:42 by rparodi           #+#    #+#             */
+/*   Updated: 2025/09/05 10:43:55 by rparodi          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "char.h"
+#include "color.h"
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+int	main(void)
+{
+	unsigned char	c;
+
+	c = 0;
+	while (c <= 128)
+	{
+		if (ft_isprint(c) != isprint(c))
+		{
+			printf("%s✘ Found %i, excepted %i%s\n", CLR_RED, ft_isprint(c),
+				isprint(c), RESET);
+			exit(1);
+		}
+		else
+			printf("%s✔%s ", CLR_GREEN, RESET);
+		c++;
+	}
+}

test/char/test_tolower.c

@@ -0,0 +1,36 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   test_tolower.c                                     :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: rparodi <rparodi@student.42.fr>            +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/09/04 16:54:42 by rparodi           #+#    #+#             */
+/*   Updated: 2025/09/05 10:35:53 by rparodi          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "char.h"
+#include "color.h"
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+int	main(void)
+{
+	unsigned char	c;
+
+	c = 0;
+	while (c <= 128)
+	{
+		if (ft_tolower(c) != tolower(c))
+		{
+			printf("%s✘ Found %i, excepted %i%s\n", CLR_RED, ft_tolower(c),
+				tolower(c), RESET);
+			exit(1);
+		}
+		else
+			printf("%s✔%s ", CLR_GREEN, RESET);
+		c++;
+	}
+}

test/char/test_toupper.c

@@ -0,0 +1,36 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   test_toupper.c                                     :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: rparodi <rparodi@student.42.fr>            +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/09/04 16:54:42 by rparodi           #+#    #+#             */
+/*   Updated: 2025/09/05 10:37:26 by rparodi          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "char.h"
+#include "color.h"
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+int	main(void)
+{
+	unsigned char	c;
+
+	c = 0;
+	while (c <= 128)
+	{
+		if (ft_toupper(c) != toupper(c))
+		{
+			printf("%s✘ Found %i, excepted %i%s\n", CLR_RED, ft_toupper(c),
+				toupper(c), RESET);
+			exit(1);
+		}
+		else
+			printf("%s✔%s ", CLR_GREEN, RESET);
+		c++;
+	}
+}