From e7136c626f433bcdc101eaa24191ce5682803540 Mon Sep 17 00:00:00 2001
From: Martin Ling <martin-git@earth.li>
Date: Mon, 2 Nov 2015 00:40:40 +0000
Subject: [PATCH] Add new sr_dev_options() helper function.

This function replaces the pattern of calling config_list() with
SR_CONF_DEVICE_OPTIONS to obtain a list of device options. Note
that this does not include the SR_CONF_{GET,SET,LIST} bitmask,
which is now retrieved for a specific key by calling
sr_dev_config_capabilties().
---
 include/libsigrok/proto.h |  2 ++
 src/device.c              | 47 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 49 insertions(+)

diff --git a/include/libsigrok/proto.h b/include/libsigrok/proto.h
index 06aa29a8..fc63ae23 100644
--- a/include/libsigrok/proto.h
+++ b/include/libsigrok/proto.h
@@ -58,6 +58,8 @@ SR_API int sr_dev_channel_enable(struct sr_channel *channel,
 SR_API gboolean sr_dev_has_option(const struct sr_dev_inst *sdi, int key);
 SR_API int sr_dev_config_capabilities(const struct sr_dev_inst *sdi,
 		const struct sr_channel_group *cg, int key);
+SR_API GArray *sr_dev_options(const struct sr_dev_driver *driver,
+		const struct sr_dev_inst *sdi, const struct sr_channel_group *cg);
 SR_API GSList *sr_dev_list(const struct sr_dev_driver *driver);
 SR_API int sr_dev_clear(const struct sr_dev_driver *driver);
 SR_API int sr_dev_open(struct sr_dev_inst *sdi);
diff --git a/src/device.c b/src/device.c
index 27508a45..cb400bf1 100644
--- a/src/device.c
+++ b/src/device.c
@@ -196,6 +196,53 @@ SR_API gboolean sr_dev_has_option(const struct sr_dev_inst *sdi, int key)
 	return ret;
 }
 
+/**
+ * Enumerate the configuration options of the specified item.
+ *
+ * @param driver Pointer to the driver to be checked. Must not be NULL.
+ * @param sdi Pointer to the device instance to be checked. May be NULL to
+ *            check driver options.
+ * @param cg  Pointer to a channel group, if a specific channel group is to
+ *            be checked. Must be NULL to check device-wide options.
+ * @return A GArray * of enum sr_configkey values, or NULL on invalid
+ *         arguments. The array must be freed by the caller using
+ *         g_array_free().
+ *
+ * @since 0.4.0
+ */
+SR_API GArray *sr_dev_options(
+		const struct sr_dev_driver *driver, const struct sr_dev_inst *sdi,
+		const struct sr_channel_group *cg)
+{
+	GVariant *gvar;
+	const uint32_t *opts;
+	uint32_t opt;
+	gsize num_opts, i;
+	GArray *result;
+
+	if (!driver || !driver->config_list)
+		return NULL;
+
+	if (sdi && sdi->driver != driver)
+		return NULL;
+
+	if (driver->config_list(SR_CONF_DEVICE_OPTIONS, &gvar, sdi, cg) != SR_OK)
+		return NULL;
+
+	opts = g_variant_get_fixed_array(gvar, &num_opts, sizeof(uint32_t));
+
+	result = g_array_sized_new(FALSE, FALSE, sizeof(uint32_t), num_opts);
+
+	for (i = 0; i < num_opts; i++) {
+		opt = opts[i] & SR_CONF_MASK;
+		g_array_insert_val(result, i, opt);
+	}
+
+	g_variant_unref(gvar);
+
+	return result;
+}
+
 /**
  * Enumerate the configuration capabilities supported by a device instance
  * for a given configuration key.