C doesn't allow zero length arrays

So make NULL member for functions with no kwargs

Author: rogerbinns

src/apsw.docstrings

@@ -798,7 +798,7 @@
 "\n" \
 "Calls: `sqlite3changegroup_delete <https://sqlite.org/session/sqlite3changegroup_delete.html>`__\n" 
 
-#define ChangesetBuilder_close_KWNAMES 
+#define ChangesetBuilder_close_KWNAMES NULL
 #define ChangesetBuilder_close_USAGE "ChangesetBuilder.close() -> None"
 
 #define ChangesetBuilder_close_CHECK do { \
@@ -810,7 +810,7 @@
 "\n" \
 "Calls: `sqlite3changegroup_new <https://sqlite.org/session/sqlite3changegroup_new.html>`__\n" 
 
-#define ChangesetBuilder_init_KWNAMES 
+#define ChangesetBuilder_init_KWNAMES NULL
 #define ChangesetBuilder_init_USAGE "ChangesetBuilder.__init__()"
 
 #define ChangesetBuilder_init_CHECK do { \
@@ -822,7 +822,7 @@
 "\n" \
 "Calls: `sqlite3changegroup_output <https://sqlite.org/session/sqlite3changegroup_output.html>`__\n" 
 
-#define ChangesetBuilder_output_KWNAMES 
+#define ChangesetBuilder_output_KWNAMES NULL
 #define ChangesetBuilder_output_USAGE "ChangesetBuilder.output() -> bytes"
 
 #define ChangesetBuilder_output_CHECK do { \
@@ -3606,7 +3606,7 @@
 "\n" \
 "Calls: `sqlite3rebaser_create <https://sqlite.org/session/sqlite3rebaser_create.html>`__\n" 
 
-#define Rebaser_init_KWNAMES 
+#define Rebaser_init_KWNAMES NULL
 #define Rebaser_init_USAGE "Rebaser.__init__()"
 
 #define Rebaser_init_CHECK do { \
@@ -3696,7 +3696,7 @@
 "\n" \
 "Calls: `sqlite3session_delete <https://sqlite.org/session/sqlite3session_delete.html>`__\n" 
 
-#define Session_close_KWNAMES 
+#define Session_close_KWNAMES NULL
 #define Session_close_USAGE "Session.close() -> None"
 
 #define Session_close_CHECK do { \

src/argparse.c

@@ -23,7 +23,7 @@ ARG_WHICH_KEYWORD(PyObject *item, const char *kwlist[], size_t n_kwlist, const c
   size_t cmp;
   int res = -1;
   if (n)
-    for (cmp = 0; cmp < n_kwlist; cmp++)
+    for (cmp = 0; cmp < n_kwlist && kwlist[cmp]; cmp++)
     {
       if (0 == strcmp(n, kwlist[cmp]))
       {

tools/gendocstrings.py

@@ -676,7 +676,8 @@ def do_argparse(item):
     code = "\n".join(line for line in code.split("\n") if line.strip())
 
     res.insert(0, f"""#define { item['symbol'] }_USAGE "{ get_usage(item) }"\n""")
-    n = ", ".join(f'"{ a }"' for a in kwlist)
+    n = ", ".join(f'"{ a }"' for a in kwlist) if kwlist else "NULL"
+
     res.insert(0, f"""#define { item['symbol'] }_KWNAMES { n }""")
 
     check_and_update(f"{ item['symbol'] }_CHECK", code)