https://github.com/jstedfast/gmime/issues/172
https://github.com/jstedfast/gmime/commit/df1151b32fbf45b10d27801c49f2db883be7d5b7

From df1151b32fbf45b10d27801c49f2db883be7d5b7 Mon Sep 17 00:00:00 2001
From: Jeffrey Stedfast <jestedfa@microsoft.com>
Date: Fri, 4 Apr 2025 09:37:48 -0400
Subject: [PATCH] Revert g_mime_parser_options_set_warning_callback() and added
 _full() version

Fixes issue #172
---
 examples/msgcheck.c          |  2 +-
 gmime/gmime-parser-options.c | 33 +++++++++++++++++++++++----------
 gmime/gmime-parser-options.h |  4 ++--
 3 files changed, 26 insertions(+), 13 deletions(-)

diff --git a/examples/msgcheck.c b/examples/msgcheck.c
index 46e018c4..8b91e662 100644
--- a/examples/msgcheck.c
+++ b/examples/msgcheck.c
@@ -110,7 +110,7 @@ check_msg_file (const gchar *filename)
 		parser = g_mime_parser_new ();
 		g_mime_parser_init_with_stream (parser, stream);
 		options = g_mime_parser_options_new ();
-		g_mime_parser_options_set_warning_callback (options, parser_issue, NULL, NULL);
+		g_mime_parser_options_set_warning_callback (options, parser_issue, NULL);
 		message = g_mime_parser_construct_message (parser, options);
 		g_mime_parser_options_free (options);
 		g_object_unref (parser);
diff --git a/gmime/gmime-parser-options.c b/gmime/gmime-parser-options.c
index ae84d671..820c3299 100644
--- a/gmime/gmime-parser-options.c
+++ b/gmime/gmime-parser-options.c
@@ -70,9 +70,9 @@ g_mime_parser_options_shutdown (void)
 	if (default_options == NULL)
 		return;
 	
-	if (default_options->notify) {
-		default_options->notify(default_options->warning_user_data);
-	}
+	if (default_options->notify)
+		default_options->notify (default_options->warning_user_data);
+	
 	g_strfreev (default_options->charsets);
 	g_slice_free (GMimeParserOptions, default_options);
 	default_options = NULL;
@@ -193,9 +193,9 @@ g_mime_parser_options_free (GMimeParserOptions *options)
 	g_return_if_fail (options != NULL);
 	
 	if (options != default_options) {
-		if (options->notify) {
-			options->notify(options->warning_user_data);
-		}
+		if (options->notify)
+			options->notify (options->warning_user_data);
+		
 		g_strfreev (options->charsets);
 		g_slice_free (GMimeParserOptions, options);
 	}
@@ -450,18 +450,31 @@ g_mime_parser_options_get_warning_callback (GMimeParserOptions *options)
  * @options: a #GMimeParserOptions
  * @warning_cb: a #GMimeParserWarningFunc or %NULL to clear the callback
  * @user_data: data passed to the warning callback function
+ *
+ * Registers the callback function being called if the parser detects any issues.
+ **/
+void
+g_mime_parser_options_set_warning_callback (GMimeParserOptions *options, GMimeParserWarningFunc warning_cb, gpointer user_data)
+{
+	g_mime_parser_options_set_warning_callback_full (options, warning_cb, user_data, NULL);
+}
+
+/**
+ * g_mime_parser_options_set_warning_callback_full:
+ * @options: a #GMimeParserOptions
+ * @warning_cb: a #GMimeParserWarningFunc or %NULL to clear the callback
+ * @user_data: data passed to the warning callback function
  * @notify: callback function ran on destruction
  *
  * Registers the callback function being called if the parser detects any issues.
  **/
 void
-g_mime_parser_options_set_warning_callback (GMimeParserOptions *options, GMimeParserWarningFunc warning_cb, gpointer user_data, GDestroyNotify notify)
+g_mime_parser_options_set_warning_callback_full (GMimeParserOptions *options, GMimeParserWarningFunc warning_cb, gpointer user_data, GDestroyNotify notify)
 {
 	g_return_if_fail (options != NULL);
 
-	if (options->notify) {
-		options->notify(options->warning_user_data);
-	}
+	if (options->notify)
+		options->notify (options->warning_user_data);
 	
 	options->warning_cb = warning_cb;
 	options->warning_user_data = user_data;
diff --git a/gmime/gmime-parser-options.h b/gmime/gmime-parser-options.h
index c37d9999..b26160cf 100644
--- a/gmime/gmime-parser-options.h
+++ b/gmime/gmime-parser-options.h
@@ -128,8 +128,8 @@ const char **g_mime_parser_options_get_fallback_charsets (GMimeParserOptions *op
 void g_mime_parser_options_set_fallback_charsets (GMimeParserOptions *options, const char **charsets);
 
 GMimeParserWarningFunc g_mime_parser_options_get_warning_callback (GMimeParserOptions *options);
-void g_mime_parser_options_set_warning_callback (GMimeParserOptions *options, 
-		GMimeParserWarningFunc warning_cb, gpointer user_data, GDestroyNotify notify);
+void g_mime_parser_options_set_warning_callback (GMimeParserOptions *options, GMimeParserWarningFunc warning_cb, gpointer user_data);
+void g_mime_parser_options_set_warning_callback_full (GMimeParserOptions *options, GMimeParserWarningFunc warning_cb, gpointer user_data, GDestroyNotify notify);
 
 G_END_DECLS