[ft_substr] false positive?

[mjy9088]

libftTester/tests/ft_substr_test.cpp

Lines 27 to 29 in fed5efe

	s = ft_substr("tripouille", 100, 1);
	/* 5 */ check(!strcmp(s, ""));
	/* 6 */ mcheck(s, 1); free(s); showLeaks();

This test might be problematic

ft_substr("123456789\0Hello world!", 10, 100); // "Hello world!" expected? or undefined behavior?

[Tripouille]

imo if start >= len(s) an empty string allocated should be return.

[mjy9088]

May I ask why wouldn't that be considered invalid input?

There is a mention of the case where length is longer than the remaining length, but no mention of the case where start is longer than the total length.