Unified state

.gitignore

@@ -1,4 +1,5 @@
 /build*/
 /compile_commands.json
 /.cache/
-/.vscode/
+/.vscode/
+.DS_Store

include/session/config.h

@@ -4,10 +4,22 @@
 extern "C" {
 #endif
 
+#include <stddef.h>
 #include <stdint.h>
 
 typedef int64_t seqno_t;
 
+/// Struct containing a list of C strings.  Typically where this is returned by this API it must be
+/// freed (via `free()`) when done with it.
+///
+/// When returned as a pointer by a libsession-util function this is allocated in such a way that
+/// just the outer session_string_list can be free()d to free both the list *and* the inner `value`
+/// and pointed-at values.
+typedef struct session_string_list {
+    char** value;  // array of null-terminated C strings
+    size_t len;    // length of `value`
+} session_string_list;
+
 #ifdef __cplusplus
 }
 #endif