Bad mess, please ignore

.gitignore

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+*.o
+*.a
+test

Makefile

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+# **************************************************************************** #
+#                                                                              #
+#                                                         :::      ::::::::    #
+#    Makefile                                           :+:      :+:    :+:    #
+#                                                     +:+ +:+         +:+      #
+#    By: kcolin <marvin@42.fr>                      +#+  +:+       +#+         #
+#                                                 +#+#+#+#+#+   +#+            #
+#    Created: 2024/10/24 11:29:38 by kcolin            #+#    #+#              #
+#    Updated: 2024/10/24 12:14:29 by kcolin           ###   ########.fr        #
+#                                                                              #
+# **************************************************************************** #
+
+CFLAGS = -Wall -Wextra -Werror -ggdb
+
+NAME = libgnl.a
+SRCS = get_next_line.c
+OBJS = $(SRCS:.c=.o)
+
+TEST = test
+TEST_SRC = test.c
+TEST_OBJ = $(TEST_SRC:.c=.o)
+
+.PHONY: all
+all: $(NAME) $(TEST)
+
+$(TEST): $(NAME) $(TEST_OBJ)
+	$(CC) $(CFLAGS) -o $(TEST) $(TEST_OBJ) -L. -lgnl 
+
+$(NAME): $(OBJS)
+	ar rcs $(NAME) $(OBJS)	
+
+.PHONY: clean
+clean:
+	find . -name '*.o' -delete -print
+
+.PHONY: fclean
+fclean: clean
+	rm -f $(NAME)
+
+.PHONY: re
+re:
+	+make fclean
+	+make all

get_next_line.c

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+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   get_next_line.c                                    :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: kcolin <marvin@42.fr>                      +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/10/23 20:32:46 by kcolin            #+#    #+#             */
+/*   Updated: 2024/10/24 12:34:49 by kcolin           ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "get_next_line.h"
+#include <stdlib.h>
+
+static char	*ft_realloc(char *ptr, size_t new_size, size_t old_size)
+{
+	char	*outptr;
+	size_t	i;
+
+	outptr = malloc(new_size);
+	if (outptr != NULL)
+	{
+		i = 0;
+		while (i < old_size)
+		{
+			outptr[i] = ptr[i];
+			i++;
+		}
+	}
+	free(ptr);
+	return (outptr);
+}
+
+static char	*ft_strchr(const char *s, int c)
+{
+	int	i;
+
+	i = 0;
+	while (s[i] != '\0')
+	{
+		if (s[i] == (char)c)
+			return ((char *)s + i);
+		i++;
+	}
+	if ((char)c == '\0')
+		return ((char *)s + i);
+	return (0);
+}
+
+char	*get_next_line(int fd)
+{
+	static char		*buffer = NULL;
+	static size_t	buf_size = BUFFER_SIZE;
+	static size_t	length = 0;
+	int				num_bytes_read;
+	char			*newline_addr;
+	char			*out;
+	long			i;
+
+	if (buffer == NULL)
+	{
+		buffer = malloc(BUFFER_SIZE * sizeof(char));
+		buf_size = BUFFER_SIZE;
+		length = 0;
+	}
+	if (buffer == NULL)
+		return (NULL);
+	num_bytes_read = 1;
+	while (num_bytes_read != 0)
+	{
+		if (length == buf_size)
+		{
+			buffer = ft_realloc(buffer, sizeof(char) * buf_size * 1.5, buf_size);
+			if (buffer == NULL)
+				return (NULL);
+			buf_size *= 1.5;
+		}
+		num_bytes_read = read(fd, buffer + length, buf_size - length);
+		if (num_bytes_read < 0)
+		{
+			free(buffer);
+			buffer = NULL;
+			return (NULL);
+		}
+		length += num_bytes_read;
+		newline_addr = ft_strchr(buffer, '\n');
+		if (newline_addr != NULL)
+		{
+			out = malloc((newline_addr - buffer + 1) * sizeof(char));
+			out[(newline_addr - buffer)] = '\0';
+			i = 0;
+			while (i < (newline_addr - buffer))
+			{
+				out[i] = buffer[i];
+				i++;
+			}
+			return (out);
+		}
+	}
+	return (buffer);
+}

get_next_line.h

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+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   get_next_line.h                                    :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: kcolin <marvin@42.fr>                      +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/10/23 20:23:21 by kcolin            #+#    #+#             */
+/*   Updated: 2024/10/23 20:24:50 by kcolin           ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#ifndef GET_NEXT_LINE_H
+# define GET_NEXT_LINE_H
+
+# include <stdlib.h>
+# include <unistd.h>
+
+# ifndef BUFFER_SIZE
+#  define BUFFER_SIZE 1024
+# endif
+
+char	*get_next_line(int fd);
+
+#endif

test.c

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+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   test.c                                             :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: kcolin <marvin@42.fr>                      +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/10/24 11:51:57 by kcolin            #+#    #+#             */
+/*   Updated: 2024/10/24 11:59:09 by kcolin           ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "get_next_line.h"
+#include <stdio.h>
+#include <fcntl.h>
+
+int	main(int argc, char **argv)
+{
+	int		fd;
+	char	*line;
+
+	if (argc == 2)
+	{
+		fd = open(argv[1], O_RDONLY);
+		line = "";
+		while (line != NULL)
+		{
+			line = get_next_line(fd);
+			if (line != NULL)
+			{
+				printf("%s", line);
+				free(line);
+			}
+		}
+		return (0);
+	}
+	else
+	{
+		printf("Usage: %s <path>\n", argv[0]);
+		return (1);
+	}
+}