analysis: Don't use IntoGStr for string params with length

Also rename the old detect_length to detect_array to make it more clear

src/analysis/bounds.rs

@@ -90,6 +90,9 @@ impl Bounds {
         concurrency: Concurrency,
         configured_functions: &[&config::functions::Function],
     ) -> (Option<String>, Option<CallbackInfo>) {
+        if par.has_length && par.is_gstr(env) {
+            return (None, None);
+        }
         let type_name = RustType::builder(env, par.typ)
             .ref_mode(if par.move_ || future {
                 RefMode::None

src/analysis/function_parameters.rs

@@ -63,6 +63,7 @@ pub struct CParameter {
     pub transfer: library::Transfer,
     pub caller_allocates: bool,
     pub is_error: bool,
+    pub has_length: bool,
     pub scope: ParameterScope,
     /// Index of the user data parameter associated with the callback.
     pub user_data_index: Option<usize>,
@@ -76,6 +77,25 @@ pub struct CParameter {
     pub move_: bool,
 }
 
+impl CParameter {
+    pub fn is_gstr(&self, env: &Env) -> bool {
+        matches!(
+            env.type_(self.typ),
+            library::Type::Basic(library::Basic::Utf8)
+        ) && self.ref_mode.is_ref()
+    }
+    pub fn is_strv(&self, env: &Env) -> bool {
+        if let library::Type::CArray(inner) = env.type_(self.typ) {
+            matches!(
+                env.type_(*inner),
+                library::Type::Basic(library::Basic::Utf8)
+            ) && matches!(self.c_type.as_str(), "char**" | "gchar**")
+        } else {
+            false
+        }
+    }
+}
+
 #[derive(Clone, Debug)]
 pub enum TransformationType {
     ToGlibDirect {
@@ -288,7 +308,7 @@ pub fn analyze(
             array_par = array_lengths.get(&(pos as u32)).copied();
         }
         if array_par.is_none() && !disable_length_detect {
-            array_par = detect_length(env, pos, par, function_parameters);
+            array_par = detect_array(env, pos, par, function_parameters);
         }
         if let Some(array_par) = array_par {
             let mut array_name = nameutil::mangle_keywords(&array_par.name);
@@ -319,6 +339,9 @@ pub fn analyze(
             };
             parameters.transformations.push(transformation);
         }
+        let has_length = par.array_length.is_some()
+            || (!disable_length_detect
+                && detect_length(env, pos, par, function_parameters).is_some());
 
         let immutable = configured_parameters.iter().any(|p| p.constant);
         let ref_mode =
@@ -340,6 +363,7 @@ pub fn analyze(
             nullable,
             ref_mode,
             is_error: par.is_error,
+            has_length,
             scope: par.scope,
             user_data_index: par.closure,
             destroy_index: par.destroy,
@@ -454,31 +478,22 @@ pub fn analyze(
         }
 
         let c_par = parameters.c_parameters.last().unwrap();
-        match env.type_(typ) {
-            library::Type::Basic(library::Basic::Utf8) if ref_mode.is_ref() => {
-                transformation.transformation_type = TransformationType::RunWith {
-                    name: c_par.name.clone(),
-                    func: if *c_par.nullable {
-                        nameutil::use_glib_type(env, "IntoOptionalGStr::run_with_gstr")
-                    } else {
-                        nameutil::use_glib_type(env, "IntoGStr::run_with_gstr")
-                    },
-                    inner: Box::new(transformation.transformation_type),
-                };
-            }
-            library::Type::CArray(inner)
-                if matches!(
-                    env.type_(*inner),
-                    library::Type::Basic(library::Basic::Utf8)
-                ) && matches!(c_par.c_type.as_str(), "char**" | "gchar**") =>
-            {
-                transformation.transformation_type = TransformationType::RunWith {
-                    name: c_par.name.clone(),
-                    func: nameutil::use_glib_type(env, "IntoStrV::run_with_strv"),
-                    inner: Box::new(TransformationType::AsPtr(c_par.name.clone())),
-                };
-            }
-            _ => {}
+        if c_par.is_gstr(env) && !has_length {
+            transformation.transformation_type = TransformationType::RunWith {
+                name: c_par.name.clone(),
+                func: if *c_par.nullable {
+                    nameutil::use_glib_type(env, "IntoOptionalGStr::run_with_gstr")
+                } else {
+                    nameutil::use_glib_type(env, "IntoGStr::run_with_gstr")
+                },
+                inner: Box::new(transformation.transformation_type),
+            };
+        } else if c_par.is_strv(env) {
+            transformation.transformation_type = TransformationType::RunWith {
+                name: c_par.name.clone(),
+                func: nameutil::use_glib_type(env, "IntoStrV::run_with_strv"),
+                inner: Box::new(TransformationType::AsPtr(c_par.name.clone())),
+            };
         }
 
         parameters.transformations.push(transformation);
@@ -507,30 +522,33 @@ fn detect_length<'a>(
     par: &library::Parameter,
     parameters: &'a [library::Parameter],
 ) -> Option<&'a library::Parameter> {
-    if !is_length(par) {
+    if !has_length(env, par.typ) {
         return None;
     }
 
-    parameters.get(pos - 1).and_then(|p| {
-        if has_length(env, p.typ) {
-            Some(p)
-        } else {
-            None
-        }
-    })
+    parameters
+        .get(pos + 1)
+        .and_then(|p| is_length(p).then_some(p))
 }
 
-fn is_length(par: &library::Parameter) -> bool {
-    if par.direction != library::ParameterDirection::In {
-        return false;
+fn detect_array<'a>(
+    env: &Env,
+    pos: usize,
+    par: &library::Parameter,
+    parameters: &'a [library::Parameter],
+) -> Option<&'a library::Parameter> {
+    if !is_length(par) {
+        return None;
     }
 
-    let len = par.name.len();
-    if len >= 3 && &par.name[len - 3..len] == "len" {
-        return true;
-    }
+    parameters
+        .get(pos.checked_sub(1)?)
+        .and_then(|p| has_length(env, p.typ).then_some(p))
+}
 
-    par.name.contains("length")
+fn is_length(par: &library::Parameter) -> bool {
+    par.direction == library::ParameterDirection::In
+        && (par.name.ends_with("len") || par.name.contains("length"))
 }
 
 fn has_length(env: &Env, typ: TypeId) -> bool {