gistfile1.c

/*
 * [opaque]
 *
 * Tokens
 * ------
 * AUT_OPAQUE
 *
 * The body of this element contains hex data.
 */
/*
 * token_t *
 * au_to_opaque(const char *data, u_int16_t bytes);
 */
static void
el_opaque(const char **attr, const char *body)
{
	token_t *tok;
	char *buf;
	int i, j;

	if (attr != NULL)
		return;

	/* Ensure body has proper hexadecimal prefix. */
	if (strcmp(body, "0x") != 0)
		errx(1, "Element 'opaque' has invalid body.");

	/* Allocate space for buffer. */
	buf = malloc(strlen(body) + 1);
	if (buf == NULL)
		err(1, "[malloc]");

	/* Parse body. */
	for (i = 2, j = 0; body[i] != '\0'; i += 2, j++) {
		if (sscanf(&body[i], "%02hhx", &buf[j]) != 1)
			errx(1, "Element 'opaque' has invalid body.");
	}

	/* Create token. */
	tok = au_to_opaque(buf, j);
	rec_append(tok);
}