⚙️ Conversion & Character Utilities Update #3

🛡️ Robustness Buffs (Conversion Functions)
• 🧩 ft_atoi and ft_atoll gained a safety shield: they now return 0 when passed a null pointer, preventing accidental crashes.
• This change improves stability across the board, ensuring safer handling of unexpected input.

🧪 Test Suite Expansions

New & Expanded Conversion Trials
• 📝 Added extensive test coverage for ft_atoi, ft_atoll, and ft_itoa, including edge cases and null pointer handling.
• These tests live in test/convert/ and ensure your conversion toolkit is battle-ready for any scenario.

Character Function Test Output Polish
• ✨ Updated all character test files (test_isalnum.c, test_isalpha.c, test_isascii.c, test_isprint.c, test_tolower.c, test_toupper.c) with better output formatting.
• Each result now ends with a newline → improved readability during long test runs.

🔨 Build & Test Process
• 🧹 The Makefile has been optimized:
• test target now depends on fclean + $(NAME) → always runs on a clean build.
• The test runner loop has been reformatted for cleaner output.

📦 Minor Updates
• 📅 File headers refreshed to reflect the latest modification dates, keeping the codebase neat and consistent.

⚡ Impact
• Stronger crash resistance for conversion functions.
• More comprehensive and reliable test suite.
• Cleaner, more professional build & test pipeline.
• Better dev experience thanks to polished test outputs.

Makefile

@@ -6,7 +6,7 @@
 #    By: rparodi <marvin@42.fr>                     +#+  +:+       +#+         #
 #                                                 +#+#+#+#+#+   +#+            #
 #    Created: 2023/11/12 11:05:05 by rparodi           #+#    #+#              #
-#    Updated: 2025/09/04 18:48:57 by rparodi          ###   ########.fr        #
+#    Updated: 2025/09/05 15:10:23 by rparodi          ###   ########.fr        #
 #                                                                              #
 # **************************************************************************** #
 
@@ -163,15 +163,15 @@ TEST_SRCS := $(shell find test -type f -name '*.c' 2>/dev/null)
 
 TEST_BINS := $(patsubst test/%.c,.test/%,$(TEST_SRCS))
 
-test: all $(LIB_NAME) $(TEST_BINS) test-run footer
+test: fclean $(NAME) $(TEST_BINS) test-run footer
 
 .test/%: test/%.c $(LIB_NAME)
 	@mkdir -p $(dir $@)
 	@$(CC) $(CFLAGS) $(CPPFLAGS) $< -L. -lft $(LDFLAGS) -o $@
 
 test-run:
-	@set -e; \
+	@set -e
-	for t in $(TEST_BINS); do \
+	@for t in $(TEST_BINS); do \
 		printf "\n\n$(GREY)>> Running $(GOLD)$$t$(END)\n"; \
 		TERM=xterm $$t; \
 	done; \

convert/ft_atoi.c

@@ -6,7 +6,7 @@
 /*   By: rparodi <marvin@42.fr>                     +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2023/11/08 17:22:41 by rparodi           #+#    #+#             */
-/*   Updated: 2025/09/04 11:39:58 by rparodi          ###   ########.fr       */
+/*   Updated: 2025/09/05 14:34:51 by rparodi          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -43,6 +43,8 @@ int	ft_atoi(const char *nptr)
 	int	sign;
 	int	number;
 
+	if (!nptr)
+		return (0);
 	i = 0;
 	sign = ft_check_sign(nptr, &i);
 	number = 0;

convert/ft_atoll.c

@@ -6,7 +6,7 @@
 /*   By: rparodi <rparodi@student.42.fr>            +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/10/31 15:12:07 by rparodi           #+#    #+#             */
-/*   Updated: 2025/09/01 16:32:11 by rparodi          ###   ########.fr       */
+/*   Updated: 2025/09/05 14:54:50 by rparodi          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -45,6 +45,8 @@ long long int	ft_atoll(const char *nptr)
 	int				sign;
 	long long int	number;
 
+	if (!nptr)
+		return (0);
 	i = 0;
 	sign = ft_check_sign(nptr, &i);
 	number = 0;

test/char/test_isalnum.c

@@ -6,7 +6,7 @@
 /*   By: rparodi <rparodi@student.42.fr>            +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/09/04 16:54:42 by rparodi           #+#    #+#             */
-/*   Updated: 2025/09/04 18:50:17 by rparodi          ###   ########.fr       */
+/*   Updated: 2025/09/05 11:24:26 by rparodi          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -33,4 +33,5 @@ int	main(void)
 			printf("%s✔%s ", CLR_GREEN, RESET);
 		c++;
 	}
+	puts("\n");
 }

test/char/test_isalpha.c

@@ -6,7 +6,7 @@
 /*   By: rparodi <rparodi@student.42.fr>            +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/09/04 18:41:04 by rparodi           #+#    #+#             */
-/*   Updated: 2025/09/04 18:49:58 by rparodi          ###   ########.fr       */
+/*   Updated: 2025/09/05 11:23:32 by rparodi          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -33,4 +33,5 @@ int	main(void)
 			printf("%s✔%s ", CLR_GREEN, RESET);
 		c++;
 	}
+	puts("\n");
 }

test/char/test_isascii.c

@@ -6,7 +6,7 @@
 /*   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       */
+/*   Updated: 2025/09/05 11:24:19 by rparodi          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -33,4 +33,5 @@ int	main(void)
 			printf("%s✔%s ", CLR_GREEN, RESET);
 		c++;
 	}
+	puts("\n");
 }

test/char/test_isprint.c

@@ -6,7 +6,7 @@
 /*   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       */
+/*   Updated: 2025/09/05 11:23:32 by rparodi          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -33,4 +33,5 @@ int	main(void)
 			printf("%s✔%s ", CLR_GREEN, RESET);
 		c++;
 	}
+	puts("\n");
 }

test/char/test_tolower.c

@@ -6,7 +6,7 @@
 /*   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       */
+/*   Updated: 2025/09/05 11:23:53 by rparodi          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -33,4 +33,5 @@ int	main(void)
 			printf("%s✔%s ", CLR_GREEN, RESET);
 		c++;
 	}
+	puts("\n");
 }

test/char/test_toupper.c

@@ -6,7 +6,7 @@
 /*   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       */
+/*   Updated: 2025/09/05 11:23:46 by rparodi          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -33,4 +33,5 @@ int	main(void)
 			printf("%s✔%s ", CLR_GREEN, RESET);
 		c++;
 	}
+	puts("\n");
 }

test/convert/test_atoi.c

@@ -0,0 +1,41 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   test_atoi.c                                        :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: rparodi <rparodi@student.42.fr>            +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/09/04 16:54:42 by rparodi           #+#    #+#             */
+/*   Updated: 2025/09/05 15:05:21 by rparodi          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "color.h"
+#include "convert.h"
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+int	main(void)
+{
+	const char	*str[] = {"", "0", "42", "-42", "+-42", "-2147483648",
+		"2147483647"};
+	size_t		i;
+
+	i = 0;
+	while (i < 7)
+	{
+		if (ft_atoi(str[i]) != atoi(str[i]))
+		{
+			dprintf(2, "%s✘ Found %i, expected %i%s\n", CLR_RED,
+				ft_atoi(str[i]), atoi(str[i]), RESET);
+			exit(1);
+		}
+		else
+			printf("%s✔%s ", CLR_GREEN, RESET);
+		i++;
+	}
+	ft_atoi(NULL);
+	printf("%s✔%s", CLR_GREEN, RESET);
+	puts("\n");
+}

test/convert/test_atoll.c

@@ -0,0 +1,41 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   test_atoll.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: rparodi <rparodi@student.42.fr>            +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/09/04 16:54:42 by rparodi           #+#    #+#             */
+/*   Updated: 2025/09/05 15:05:31 by rparodi          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "color.h"
+#include "convert.h"
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+int	main(void)
+{
+	const char	*str[] = {"", "0", "42", "-42", "+-42", "-2147483648",
+		"2147483647", "9223372036854775807", "-9223372036854775808"};
+	size_t		i;
+
+	i = 0;
+	while (i < 7)
+	{
+		if (ft_atoll(str[i]) != atoll(str[i]))
+		{
+			dprintf(2, "%s✘ Found %lli, expected %lli%s\n", CLR_RED,
+				ft_atoll(str[i]), atoll(str[i]), RESET);
+			exit(1);
+		}
+		else
+			printf("%s✔%s ", CLR_GREEN, RESET);
+		i++;
+	}
+	ft_atoll(NULL);
+	printf("%s✔%s", CLR_GREEN, RESET);
+	puts("\n");
+}

test/convert/test_itoa.c

@@ -0,0 +1,43 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   test_itoa.c                                        :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: rparodi <rparodi@student.42.fr>            +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/09/04 16:54:42 by rparodi           #+#    #+#             */
+/*   Updated: 2025/09/05 15:08:52 by rparodi          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "color.h"
+#include "convert.h"
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int	main(void)
+{
+	const int	integer[] = {0, 42, -42, +-42, -2147483648, 2147483647};
+	char		result[1024];
+	size_t		i;
+
+	i = 0;
+	while (i < 7)
+	{
+		sprintf(result, "%d", integer[i]);
+		if (strcmp(ft_itoa(integer[i]), result))
+		{
+			dprintf(2, "%s✘ Found %s, expected %s%s\n", CLR_RED,
+				ft_itoa(integer[i]), result, RESET);
+			exit(1);
+		}
+		else
+			printf("%s✔%s ", CLR_GREEN, RESET);
+		i++;
+	}
+	ft_atoi(NULL);
+	printf("%s✔%s", CLR_GREEN, RESET);
+	puts("\n");
+}