style(export): gchar*/g_free consistency + auto_char in read loop

src/database_export.c

@@ -50,7 +50,8 @@
 // Dedup key: stanza_id if present, else hash of timestamp+from+body
 // =========================================================================
 
-static char*
+// Returns a g_strdup'd key — callers free with g_free (gchar* convention).
+static gchar*
 _make_dedup_key(const char* stanza_id, const char* timestamp, const char* from_jid, const char* body)
 {
     if (stanza_id && stanza_id[0] != '\0')
@@ -67,7 +68,7 @@ _make_dedup_key(const char* stanza_id, const char* timestamp, const char* from_j
     g_checksum_update(sum, (const guchar*)(from_jid ? from_jid : ""), -1);
     g_checksum_update(sum, (const guchar*)"|", 1);
     g_checksum_update(sum, (const guchar*)(body ? body : ""), -1);
-    char* key = g_strdup(g_checksum_get_string(sum));
+    gchar* key = g_strdup(g_checksum_get_string(sum));
     g_checksum_free(sum);
     return key;
 }
@@ -75,14 +76,21 @@ _make_dedup_key(const char* stanza_id, const char* timestamp, const char* from_j
 // =========================================================================
 // Helper: reverse ff_jid_to_dir (best-effort)
 // '_at_' -> '@'
+// Returns a g_strdup'd jid — callers free with g_free (gchar* convention).
+// str_replace allocates via libc malloc, so we hand over to g_-allocated.
 // =========================================================================
 
-static char*
+static gchar*
 _dir_to_jid(const char* dirname)
 {
     if (!dirname)
         return NULL;
-    return str_replace(dirname, "_at_", "@");
+    char* raw = str_replace(dirname, "_at_", "@");
+    if (!raw)
+        return NULL;
+    gchar* gres = g_strdup(raw);
+    free(raw);
+    return gres;
 }
 
 // =========================================================================
@@ -118,7 +126,7 @@ _ff_list_contacts(void)
     while ((entry = g_dir_read_name(dir)) != NULL) {
         auto_gchar gchar* full_path = g_strdup_printf("%s/%s/history.log", base_dir, entry);
         if (g_file_test(full_path, G_FILE_TEST_IS_REGULAR)) {
-            char* jid = _dir_to_jid(entry);
+            gchar* jid = _dir_to_jid(entry);
             if (jid) {
                 contacts = g_slist_prepend(contacts, jid);
             }
@@ -168,20 +176,15 @@ _ff_read_all_lines(const char* contact_barejid)
 
     while (1) {
         gboolean truncated = FALSE;
-        char* buf = ff_readline(fp, &truncated);
+        auto_char char* buf = ff_readline(fp, &truncated);
         if (!buf)
             break;
-        if (truncated) {
-            free(buf);
+        if (truncated)
             break;
-        }
-        if (buf[0] == '\0' || buf[0] == '#') {
-            free(buf);
+        if (buf[0] == '\0' || buf[0] == '#')
             continue;
-        }
 
         ff_parsed_line_t* pl = ff_parse_line(buf);
-        free(buf);
         if (pl) {
             lines = g_slist_prepend(lines, pl);
         }
@@ -234,7 +237,7 @@ _export_one_contact(const char* contact)
     GSList* existing = _ff_read_all_lines(contact);
     for (GSList* l = existing; l; l = l->next) {
         ff_parsed_line_t* pl = l->data;
-        char* key = _make_dedup_key(pl->stanza_id, pl->timestamp_str, pl->from_jid, pl->message);
+        gchar* key = _make_dedup_key(pl->stanza_id, pl->timestamp_str, pl->from_jid, pl->message);
         g_hash_table_add(seen_keys, key);
     }
     int existing_count = g_slist_length(existing);
@@ -330,7 +333,7 @@ _export_one_contact(const char* contact)
         const char* body = msg->plain ? msg->plain : "";
         const char* sid = msg->id ? msg->id : "";
 
-        char* key = _make_dedup_key(sid, ts, from_jid, body);
+        gchar* key = _make_dedup_key(sid, ts, from_jid, body);
         if (g_hash_table_contains(seen_keys, key)) {
             g_free(key);
             contact_skipped++;
@@ -509,7 +512,7 @@ log_database_import_from_flatfile(const gchar* const contact_jid)
             if (!msg)
                 continue;
             auto_gchar gchar* ts = msg->timestamp ? g_date_time_format_iso8601(msg->timestamp) : g_strdup("");
-            char* key = _make_dedup_key(msg->id, ts, msg->from_jid ? msg->from_jid->barejid : "", msg->plain);
+            gchar* key = _make_dedup_key(msg->id, ts, msg->from_jid ? msg->from_jid->barejid : "", msg->plain);
             g_hash_table_add(seen_keys, key);
         }
         g_slist_free_full(existing_msgs, (GDestroyNotify)message_free);
@@ -529,7 +532,7 @@ log_database_import_from_flatfile(const gchar* const contact_jid)
                 continue;
 
             auto_gchar gchar* ts = g_date_time_format_iso8601(pl->timestamp);
-            char* key = _make_dedup_key(pl->stanza_id, ts, pl->from_jid, pl->message);
+            gchar* key = _make_dedup_key(pl->stanza_id, ts, pl->from_jid, pl->message);
 
             if (g_hash_table_contains(seen_keys, key)) {
                 g_free(key);