The purpose of the function get_next_line() is to read a line from a file descriptor and return it. The function reads the file line by line, which means that each call to get_next_line returns the next line in the file. Here's a step-by-step explanation of how the code works:
- get_next_line is the main function. It takes a file descriptor
fd
as input. It has a static variableline
which retains its value between function calls. This is used to keep track of the remaining part of the file to be read. ft_read
is called to read from the file descriptorfd
into line. It reads up toBUFFER_SIZE
characters at a time. If it encounters a newline character ('\n'), it stops reading. If an error occurs during reading, it freescup
andline
and returnsNULL
.- If
line
isNULL
or an empty string after the call toft_read
, get_next_line freesline
and returnsNULL
. ft_substr_ft
is called to get the substring ofline
up to and including the first newline character. This is the line to be returned by get_next_line.- ft_save_static is called to get the remaining part of line after the first newline character. This is saved in line for the next call to get_next_line.
- get_next_line returns the line read from the file.
ft_substr_ft
andft_save_static
both allocate memory for the strings they return. It's the responsibility of the caller to free this memory when it's no longer needed.- If any of the memory allocations fail, the functions return
NULL
. This is a high-level overview of how the code works. The details of how each function works can be found in their respective definitions.
Basicly the same workflow the only defference is that get_next_line(), it has a static char array line
of size 10240 (number of file descriptors you can open in one proscess). This array is used to store lines read from different file descriptors.
- I let you find em!