BIO_set_indent
if (BIO_set_prefix(bp, str) <= 0 || BIO_set_indent(bp, indent) <= 0)
BIO_set_indent(bp, saved_indent);
BIO_set_indent(*out, saved_indent);
if (BIO_set_indent(*out, indent) <= 0) {
if (BIO_set_indent(*out, indent) <= 0) {
if (BIO_set_indent(chain[idx], (long)indent) <= 0) {
BIO_set_indent(tap_out, level);
BIO_set_indent(tap_err, level);