#include <stdio.h>
#include <stdlib.h>
#include <malloc.h>

int main()
{
	int i;
	FILE *f = tmpfile();
	putc('\n', f);
	for (i=1; i<32; i++) {
		fseek(f, -1, SEEK_END);
		fputs("x\n", f);
		rewind(f);
		ungetc(getc(f), f);
		size_t n = i+1;
		char *s = malloc(n);;
		printf("%zu %zu ", n, malloc_usable_size(s));
		size_t ret = getline(&s, &n, f);
		printf("%zu %zu %zu\n", ret, n, malloc_usable_size(s));
		free(s);
	}
}