Introduce our own shutdown callback mechanism.

Instead of adding stuff to `_shutdown()`, we can now register a shutdown
routine from the respective `init()` function of our modules.

This also has the advantage, that we're sure they're called in reverse
order from how the initialization happened.

I didn't simply use `atexit()` because POSIX says that the number of
possible callbacks is limited (min 32) and I was not sure whether
we will maybe extend this number at one point.

Signed-off-by: Steffen Jaeckel <s@jaeckel.eu>

src/config/accounts.c

@@ -61,10 +61,22 @@ static Autocomplete enabled_ac;
 
 static void _save_accounts(void);
 
+static void
+_accounts_close(void)
+{
+    autocomplete_free(all_ac);
+    autocomplete_free(enabled_ac);
+    free_keyfile(&accounts_prof_keyfile);
+    accounts = NULL;
+}
+
 void
 accounts_load(void)
 {
     log_info("Loading accounts");
+
+    prof_add_shutdown_routine(_accounts_close);
+
     all_ac = autocomplete_new();
     enabled_ac = autocomplete_new();
     load_data_keyfile(&accounts_prof_keyfile, FILE_ACCOUNTS);
@@ -82,15 +94,6 @@ accounts_load(void)
     }
 }
 
-void
-accounts_close(void)
-{
-    autocomplete_free(all_ac);
-    autocomplete_free(enabled_ac);
-    free_keyfile(&accounts_prof_keyfile);
-    accounts = NULL;
-}
-
 char*
 accounts_find_enabled(const char* const prefix, gboolean previous, void* context)
 {

src/config/accounts.h

@@ -42,7 +42,6 @@
 #include "config/account.h"
 
 void accounts_load(void);
-void accounts_close(void);
 
 char* accounts_find_all(const char* const prefix, gboolean previous, void* context);
 char* accounts_find_enabled(const char* const prefix, gboolean previous, void* context);

src/config/theme.c

@@ -66,6 +66,28 @@ static void _theme_list_dir(const gchar* const dir, GSList** result);
 static GString* _theme_find(const char* const theme_name);
 static gboolean _theme_load_file(const char* const theme_name);
 
+static void
+_theme_close(void)
+{
+    color_pair_cache_free();
+    if (theme) {
+        g_key_file_free(theme);
+        theme = NULL;
+    }
+    if (theme_loc) {
+        g_string_free(theme_loc, TRUE);
+        theme_loc = NULL;
+    }
+    if (bold_items) {
+        g_hash_table_destroy(bold_items);
+        bold_items = NULL;
+    }
+    if (defaults) {
+        g_hash_table_destroy(defaults);
+        defaults = NULL;
+    }
+}
+
 void
 theme_init(const char* const theme_name)
 {
@@ -77,6 +99,8 @@ theme_init(const char* const theme_name)
         }
     }
 
+    prof_add_shutdown_routine(_theme_close);
+
     defaults = g_hash_table_new_full(g_str_hash, g_str_equal, free, free);
 
     // Set default colors
@@ -248,28 +272,6 @@ theme_list(void)
     return result;
 }
 
-void
-theme_close(void)
-{
-    color_pair_cache_free();
-    if (theme) {
-        g_key_file_free(theme);
-        theme = NULL;
-    }
-    if (theme_loc) {
-        g_string_free(theme_loc, TRUE);
-        theme_loc = NULL;
-    }
-    if (bold_items) {
-        g_hash_table_destroy(bold_items);
-        bold_items = NULL;
-    }
-    if (defaults) {
-        g_hash_table_destroy(defaults);
-        defaults = NULL;
-    }
-}
-
 void
 theme_init_colours(void)
 {

src/config/tlscerts.c

@@ -56,10 +56,25 @@ static Autocomplete certs_ac;
 
 static char* current_fp;
 
+static void
+_tlscerts_close(void)
+{
+    free_keyfile(&tlscerts_prof_keyfile);
+    tlscerts = NULL;
+
+    free(current_fp);
+    current_fp = NULL;
+
+    autocomplete_free(certs_ac);
+}
+
 void
 tlscerts_init(void)
 {
     log_info("Loading TLS certificates");
+
+    prof_add_shutdown_routine(_tlscerts_close);
+
     load_data_keyfile(&tlscerts_prof_keyfile, FILE_TLSCERTS);
     tlscerts = tlscerts_prof_keyfile.keyfile;
 
@@ -356,18 +371,6 @@ tlscerts_free(TLSCertificate* cert)
     }
 }
 
-void
-tlscerts_close(void)
-{
-    free_keyfile(&tlscerts_prof_keyfile);
-    tlscerts = NULL;
-
-    free(current_fp);
-    current_fp = NULL;
-
-    autocomplete_free(certs_ac);
-}
-
 static void
 _save_tlscerts(void)
 {

src/config/tlscerts.h

@@ -96,6 +96,4 @@ char* tlscerts_complete(const char* const prefix, gboolean previous, void* conte
 
 void tlscerts_reset_ac(void);
 
-void tlscerts_close(void);
-
 #endif