Why is it made to read one character from each line?

[shranet]

brainfuck/src/brainfuck.c

Lines 565 to 570 in 71c0e0c

	char brainfuck_getchar() {
	char ch, t;
	ch = getchar();
	while ((t = getchar()) != '\n' && t != EOF) { } /* Clear stdin */
	return ch;
	}

If we trust this repository, it's not like that in the original.
https://gist.github.com/rdebath/0ca09ec0fdcf3f82478f#file-bfi-c-L19

[sigmasternchen]

Seconded. It's not very "useful" this way.