get_next_line

🗣️ About:

🚀 What is get_next_line?

_The goal of this project is to create the function get_next_line.c which, when called in a loop, will then allow the available text in the file descriptor to be read one line at a time until the end of the file. The program must compile with the flag-D BUFFER_SIZE=xx which will be used as the buffer size for the read calls in get_next_line.

Why is get_next_line important?

_Get_next_line is a simple and challenging project which allows you to learn deeply about open(), read() and close() functions as well as static variables and file descriptors.

Grade and Badge

project parts :

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Prototype

char *get_next_line(int fd);

Return value

Read line: correct behavior NULL: nothing else to read or an error occurred

External functs.

read, malloc, free

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Mandatory part

• Calling your function get_next_line in a loop will then allow you to read the text available on the file descriptor one line at a time until the end of it.
• Your function should return the line that has just been read. If there is nothing else to read or if an error has occurred it should return NULL.
• Make sure that your function behaves well when it reads from a file and when it reads from the standard input.
• libft is not allowed for this project. You must add a get_next_line_utils.c file which will contain the functions that are needed for your get_next_line to work.
• Your program must compile with the flag -D BUFFER_SIZE=xx which will be used as the buffer size for the read calls in your get_next_line. This value will be modified by your evaluators and by the moulinette.
• The program will be compiled in this way: gcc -Wall -Wextra -Werror -D BUFFER_SIZE=42 <files>.c.
• Your read must use the BUFFER_SIZE defined during compilation to read from a file or from stdin. This value will be modified during the evaluation for testing purposes.
• In the header file get_next_line.h you must have at least the prototype of the function get_next_line.
• lseek is not an allowed function. File reading must be done only once.
• We consider that get_next_line has undefined behavior if, between two calls, the same file descriptor switches to a different file before reading everything from the first fd.
• Finally we consider that get_next_line has undefined behavior when reading from a binary file. However, if you wish, you can make this behavior coherent.
• Global variables are forbidden.
• Important: The returned line should include the \n, except if you have reached the end of file and there is no \n.

Bonus part

Turn-in all 3 mandatory files ending by _bonus.[c\h] for this part.

• To succeed get_next_line with a single static variable.
• To be able to manage multiple file descriptors with your get_next_line. For example, if the file descriptors 3, 4 and 5 are accessible for reading, then you can call get_next_line once on 3, once on 4, once again on 3 then once on 5 etc. without losing the reading thread on each of the descriptors.