glib/functions: fix get_charset logic

This tweaks `get_charset()` signature and logic to properly return
both the charset label and the UTF-8 boolean.

glib/Gir.toml

@@ -259,6 +259,10 @@ status = "generate"
     # unusable
     ignore = true
     [[object.function]]
+    name = "get_charset"
+    # boolean return value
+    ignore = true
+    [[object.function]]
     name = "get_environ"
         [object.function.return]
         string_type = "os_string"

glib/src/auto/functions.rs

@@ -571,18 +571,6 @@ pub fn get_application_name() -> Option<GString> {
     unsafe { from_glib_none(glib_sys::g_get_application_name()) }
 }
 
-pub fn get_charset() -> Option<GString> {
-    unsafe {
-        let mut charset = ptr::null();
-        let ret = from_glib(glib_sys::g_get_charset(&mut charset));
-        if ret {
-            Some(from_glib_none(charset))
-        } else {
-            None
-        }
-    }
-}
-
 pub fn get_codeset() -> GString {
     unsafe { from_glib_full(glib_sys::g_get_codeset()) }
 }

glib/src/functions.rs

@@ -1,4 +1,3 @@
-#[cfg(not(windows))]
 use glib_sys;
 #[cfg(any(feature = "v2_58", feature = "dox"))]
 #[cfg(not(windows))]
@@ -15,12 +14,11 @@ use std::os::unix::io::FromRawFd;
 // #[cfg(windows)]
 // #[cfg(any(feature = "v2_58", feature = "dox"))]
 // use std::os::windows::io::AsRawHandle;
-#[cfg(not(windows))]
 use std::ptr;
-#[cfg(not(windows))]
 use translate::*;
 #[cfg(not(windows))]
 use Error;
+use GString;
 #[cfg(not(windows))]
 use Pid;
 #[cfg(not(windows))]
@@ -212,3 +210,17 @@ pub fn spawn_async_with_pipes<
         }
     }
 }
+
+/// Obtain the character set for the current locale.
+///
+/// This returns whether the locale's encoding is UTF-8, and the current
+/// charset if available.
+pub fn get_charset() -> (bool, Option<GString>) {
+    let (is_utf8, charset);
+    let mut out_charset = ptr::null();
+    unsafe {
+        is_utf8 = from_glib(glib_sys::g_get_charset(&mut out_charset));
+        charset = from_glib_none(out_charset);
+    };
+    (is_utf8, charset)
+}