u/prober: Add helper file for prober functions

src/xrt/auxiliary/CMakeLists.txt

···
 	util/u_pacing_compositor_fake.c
 	util/u_pretty_print.c
 	util/u_pretty_print.h
+	util/u_prober.c
+	util/u_prober.h
 	util/u_sink.h
 	util/u_sink_combiner.c
 	util/u_sink_force_genlock.c

src/xrt/auxiliary/util/u_prober.c

···
+// Copyright 2019-2022, Collabora, Ltd.
+// SPDX-License-Identifier: BSL-1.0
+/*!
+ * @file
+ * @brief  Helpers for prober related code.
+ * @author Jakob Bornecrantz <[e-mail]>
+ * @author Lubosz Sarnecki <[e-mail]>
+ * @ingroup aux_util
+ */
+
+#include "xrt/xrt_prober.h"
+
+#include "u_prober.h"
+
+#include <string.h>
+
+
+/*
+ *
+ * Helpers.
+ *
+ */
+
+#define ENUM_TO_STR(r)                                                                                                 \
+	case r: return #r
+
+
+/*
+ *
+ * 'Exported' functions.
+ *
+ */
+
+const char *
+u_prober_string_to_string(enum xrt_prober_string t)
+{
+	switch (t) {
+		ENUM_TO_STR(XRT_PROBER_STRING_MANUFACTURER);
+		ENUM_TO_STR(XRT_PROBER_STRING_PRODUCT);
+		ENUM_TO_STR(XRT_PROBER_STRING_SERIAL_NUMBER);
+	}
+	return "XRT_PROBER_STRING_<INVALID>";
+}
+
+const char *
+u_prober_bus_type_to_string(enum xrt_bus_type t)
+{
+	switch (t) {
+		ENUM_TO_STR(XRT_BUS_TYPE_UNKNOWN);
+		ENUM_TO_STR(XRT_BUS_TYPE_USB);
+		ENUM_TO_STR(XRT_BUS_TYPE_BLUETOOTH);
+	}
+	return "XRT_BUS_TYPE_<INVALID>";
+}
+
+bool
+u_prober_match_string(struct xrt_prober *xp,
+                      struct xrt_prober_device *dev,
+                      enum xrt_prober_string type,
+                      const char *to_match)
+{
+	unsigned char s[256] = {0};
+	int len = xrt_prober_get_string_descriptor(xp, dev, type, s, sizeof(s));
+	if (len <= 0) {
+		return false;
+	}
+
+	return 0 == strncmp(to_match, (const char *)s, sizeof(s));
+}

src/xrt/auxiliary/util/u_prober.h

···
+// Copyright 2019-2022, Collabora, Ltd.
+// SPDX-License-Identifier: BSL-1.0
+/*!
+ * @file
+ * @brief  Helpers for prober related code.
+ * @author Jakob Bornecrantz <[e-mail]>
+ * @ingroup aux_util
+ */
+
+#pragma once
+
+#include "xrt/xrt_prober.h"
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+/*!
+ * Helper to match various strings of a xrt_prober_device to
+ * @public @memberof xrt_prober
+ */
+bool
+u_prober_match_string(struct xrt_prober *xp,
+                      struct xrt_prober_device *dev,
+                      enum xrt_prober_string type,
+                      const char *to_match);
+
+const char *
+u_prober_string_to_string(enum xrt_prober_string t);
+
+const char *
+u_prober_bus_type_to_string(enum xrt_bus_type t);
+
+bool
+u_prober_match_string(struct xrt_prober *xp,
+                      struct xrt_prober_device *dev,
+                      enum xrt_prober_string type,
+                      const char *to_match);
+
+
+#ifdef __cplusplus
+}
+#endif