util: add support for generating UUIDs

Co-authored-by: Jason Francis <cycl0ps@tuta.io>

2 files changed, 41 insertions, 0 deletions

diff --git a/util/meson.build b/util/meson.build
index 14cd59c5..06996a4e 100644
--- a/util/meson.build
+++ b/util/meson.build
@@ -7,3 +7,11 @@ wlr_files += files(
 	'signal.c',
 	'time.c',
 )
+
+if uuid.found()
+	wlr_deps += uuid
+	add_project_arguments('-DHAS_LIBUUID=1', language: 'c')
+else
+	add_project_arguments('-DHAS_LIBUUID=0', language: 'c')
+endif
+wlr_files += files('uuid.c')
diff --git a/util/uuid.c b/util/uuid.c
new file mode 100644
index 00000000..a4523216
--- /dev/null
+++ b/util/uuid.c
@@ -0,0 +1,33 @@
+#include <uuid.h>
+#include "util/uuid.h"
+
+#if HAS_LIBUUID
+bool generate_uuid(char out[static 37]) {
+	uuid_t uuid;
+	uuid_generate_random(uuid);
+	uuid_unparse(uuid, out);
+	return true;
+}
+#else
+#include <string.h>
+#include <stdlib.h>
+
+bool generate_uuid(char out[static 37]) {
+	uuid_t uuid;
+	uint32_t status;
+	uuid_create(&uuid, &status);
+	if (status != uuid_s_ok) {
+		return false;
+	}
+	char *str;
+	uuid_to_string(&uuid, &str, &status);
+	if (status != uuid_s_ok) {
+		return false;
+	}
+
+	assert(strlen(str) + 1 == 37);
+	memcpy(out, str, sizeof(out));
+	free(str);
+	return true;
+}
+#endif