Get-Next-Line 📑

ft_printf (42cursus) 2023

Actual Status : Finished

Result : 125%

This project is dedicated to a convenient feature in Left.a collection, it helps to learn a very interesting thing in C programming: static variables.

The main part:

Function name	get_next_line
Prototype	char *get_next_line(int fd);
Turn in files	get_next_line.c, get_next_line_utils.c, get_next_line.h
Parameters	fd: The file descriptor to read from
Return value	Read line: correct behavior; NULL: there is nothing else to read, or an error occurred
External functs	read, malloc, free
Description	Write a function that returns a line read from a file descriptor

• Repeated calls (for example, using a loop) to get_next_line() should allow reading the text file pointed to by the file descriptor, one line at a time.
• The function should return the string that was read. If there is nothing else to read or an error has occurred, it should return NULL.
• The function should work properly both when reading a file and when reading from standard input.
• The returned string must contain the terminating character \n, except when the end of the file has been reached and does not end with the character \n.
• The header file get_next_line.h must contain at least a prototype of the function get_next_line()
• All necessary auxiliary functions must be in the get_next_line_utils.c file.

When compiling, add this option to your compiler's call: -D BUFFER_SIZE=n.It will determine the buffer size for read(). The buffer size value can be changed for code testing.

This project should compile with and without the -D flag

You can compile the code as follows (buffer size 42 is used as an example):

cc -Wall -Wextra -Werror -D BUFFER_SIZE=42 <files>.c

• get_next_line() has undefined behavior if the file specified by the file descriptor has changed since the last call, whereas read() has not reached the end of the file.
• The get_next_line() function has undefined behavior when reading a binary file.

Forbidden

• It is not allowed to use your libft in this project.
• lseek() is forbidden.
• Global variables are prohibited.

Bonus part:

Here are the requirements for the bonus part:

• Only one static variable should be used in get_next_line().
• get_next_line() must manage multiple file descriptors at the same time.

In addition to the required details file, the following files must be passed • get_next_line_bonus.c • get_next_line_bonus.h • get_next_line_utils_bonus.c

Running tests

The main part:

cc -Wall -Wextra -Werror get_next_line.h get_next_line.c get_next_line_utils.c main.c 

./a.out [file name] [buffer size]

Example:

./a.out test_1 32 test_2 64 test_3 128

The bonus part:

cc -Wall -Wextra -Werror get_next_line_bonus.h main_bonus.c get_next_line_bonus.c get_next_line_utils_bonus.c
./a.out

You can add or change the buffer size in the main_bonus.c file.

Project instructions

Need help: elmaksim@student.42yerevan.am

Special thanks: tripouille for the gnlTester (: