get_next_line is a function allowing to read a line ending with a newline character ('\n') from a file descriptor (fd).
This was originally a 42 school project.
- The function returns a line read from a file descriptor.
- What we call a “line” is a succession of characters that ends with '\n' (ascii code 0x0a) or with End Of File (EOF).
- The function is declared as follows :
int get_next_line(int fd, char** line); - The first parameter is the file descriptor that will be used to read.
- The second parameter is the address of a pointer to a character that will be used to save the line read from the file descriptor
- Calling get_next_line in a loop will allow us to read the text available on a file descriptor one line at a time until the end of the text, no matter the size of either the text or one of its lines.
- The return value can be 1, 0 or -1 depending on whether a line has been read, when the reading has been completed, or if an error has happened respectively.
- The function returns its resulting line without '\n'.
- get_next_line has an undefined behavior if, between two calls, the same file descriptor refers to two distinct files although the reading from the first file was not completed.
- get_next_line has an undefined behavior when reading from a binary file.
- The function is able to manage multiple file descriptors. For instance, if the file descriptors 3, 4 and 5 are accessible for reading, then we 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.
This work has been validated by the following tests:
- 42TESTERS-GNL
- 42cursus_gnl_tests
- Test-42 test_gnl
- gnlTester (This test may falsely return "TIMEOUT" when testing with BUFFER_SIZE=1 with big_line_no_nl and big_line_with_nl if it is done on a Linux system.)
- norminette v.3
