Function returning a line read from a file descriptor developed with the C programming language.

This is a project developed in the cursus of 42Madrid.

Subject:

Function name	get_next_line
Prototype	char *get_next_line(int fd);
Files to be delivered	get_next_line.c, get_next_line_utils.c, get_next_line.h
Parameters	fd: File descriptor to read from
Value returned	If all goes well: the read line In case of failure or if reading ends: NULL
Allowed functions	read, malloc, free
Description	Writes a function that returns the line read from a file descriptor.

Calling the get_next_line function repeatedly (for example, using a loop) will allow you to read the contents of the file to which the file descriptor points, line by line, all the way to the end.

Bonus: Your get_next_line has to be able to handle multiple fd at once.

Project

To develop the project you must know what a File descriptor is, which is more than

A number that uniquely identifies an open file in a computer's operating system. It describes a data resource, and how that resource may be accessed.

On a Unix-like operating system, the first three file descriptors, by default:

Name	File descriptor	Description	Abbreviation
Standard input	0	The default data stream for input, for example in a command pipeline. In the terminal, this defaults to keyboard input from the user.	stdin
Standard output	1	The default data stream for output, for example when a command prints text. In the terminal, this defaults to the user’s screen.	stdout
Standard error	2	The default data stream for output that relates to an error occurring. In the terminal, this defaults to the user’s screen.	stderr

In addition, it would not hurt to study the open() read() c functions.

The open() function opens an existing file, returning a file descriptor.
int open (const char *pathname, int flags);
The read() function is responsible for reading the contents of a file descriptor, returning a buffer.
size_t read ( int filedescriptor, void* buffer, unsigned bytes );

The buffer parameter is a pointer to the memory area where the transfer is to take place. That is, where the data will be read from in the read function.

Knowing this I have developed the function, see the source code here

Project completed

Rating: lgomes-o's 42 get_next_line Score

Gest_next_line - 42Madrid

Subject:

Project

Ft_onion - 42Madrid