if (hex_encode (ctx, val, buffer_p, size_p) != HEX_SUCCESS) {
fprintf (stderr, "Error: failed to hex-encode value %s\n", val);
return 1;
}
if (hex_encode (ctx, val, buffer_p, size_p) != HEX_SUCCESS) {
fprintf (stderr, "Error: failed to hex-encode value %s\n", val);
return 1;
}