[gthumb] utils: added GString function

[Paolo Bacchilega <paobac src gnome org>]

commit ad71e6f54a8edc18ccc452f3be5bbbecdb06a782
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Sun May 16 12:43:56 2021 +0200

    utils: added GString function

 gthumb/glib-utils.c | 20 ++++++++++++++++++++
 gthumb/glib-utils.h |  3 +++
 2 files changed, 23 insertions(+)
---
diff --git a/gthumb/glib-utils.c b/gthumb/glib-utils.c
index 386c831c..760cace5 100644
--- a/gthumb/glib-utils.c
+++ b/gthumb/glib-utils.c
@@ -2113,6 +2113,26 @@ _g_error_free (GError *error)
 }
 
 
+GString *
+_g_string_append_markup_escaped (GString    *string,
+                                const char *format,
+                                ...)
+{
+       va_list  args;
+       char    *escaped;
+
+       va_start (args, format);
+       escaped = g_markup_vprintf_escaped (format, args);
+       va_end (args);
+
+       g_string_append (string, escaped);
+
+       g_free (escaped);
+
+       return string;
+}
+
+
 void
 toggle_action_activated (GSimpleAction *action,
                         GVariant      *parameter,
diff --git a/gthumb/glib-utils.h b/gthumb/glib-utils.h
index 879187b7..6470f09d 100644
--- a/gthumb/glib-utils.h
+++ b/gthumb/glib-utils.h
@@ -322,6 +322,9 @@ char *              _g_format_duration_for_display  (gint64           msecs);
 char *         _g_format_str_for_file          (const char      *format,
                                                 GFile           *file);
 void           _g_error_free                   (GError          *error);
+GString *      _g_string_append_markup_escaped (GString         *string,
+                                                const char      *format,
+                                                ...) G_GNUC_PRINTF (2, 3);
 
 DEF_ACTION_CALLBACK (toggle_action_activated)