_IO_getline
count = _IO_getline (fp, buf, n - 1, '\n', 1);
count = _IO_getline (fp, buf, n - 1, '\n', 1);
libc_hidden_def (_IO_getline)
count = _IO_getline (_IO_stdin, buf + 1, INT_MAX, '\n', 0) + 1;
extern _IO_size_t _IO_getline (_IO_FILE *,char *, _IO_size_t, int, int);
libc_hidden_proto (_IO_getline)