Merge pull request #1470 from gwenn/cstr_to_str

Use CStr::to_str where possible

src/collation.rs

@@ -128,10 +128,9 @@ impl InnerConnection {
             let callback: fn(&Connection, &str) -> Result<()> = mem::transmute(arg1);
             let res = catch_unwind(|| {
                 let conn = Connection::from_handle(arg2).unwrap();
-                let collation_name = {
-                    let c_slice = CStr::from_ptr(arg3).to_bytes();
-                    str::from_utf8(c_slice).expect("illegal collation sequence name")
-                };
+                let collation_name = CStr::from_ptr(arg3)
+                    .to_str()
+                    .expect("illegal collation sequence name");
                 callback(&conn, collation_name)
             });
             if res.is_err() {

src/column.rs

@@ -104,7 +104,9 @@ impl Statement<'_> {
             // clippy::or_fun_call (nightly) vs clippy::unnecessary-lazy-evaluations (stable)
             .ok_or(Error::InvalidColumnIndex(col))
             .map(|slice| {
-                str::from_utf8(slice.to_bytes()).expect("Invalid UTF-8 sequence in column name")
+                slice
+                    .to_str()
+                    .expect("Invalid UTF-8 sequence in column name")
             })
     }
 
@@ -149,7 +151,8 @@ impl Statement<'_> {
             let name = self.column_name_unwrap(i);
             let slice = self.stmt.column_decltype(i);
             let decl_type = slice.map(|s| {
-                str::from_utf8(s.to_bytes()).expect("Invalid UTF-8 sequence in column declaration")
+                s.to_str()
+                    .expect("Invalid UTF-8 sequence in column declaration")
             });
             cols.push(Column { name, decl_type });
         }

src/hooks.rs

@@ -666,7 +666,8 @@ unsafe fn expect_optional_utf8<'a>(
     if p_str.is_null() {
         return None;
     }
-    std::str::from_utf8(std::ffi::CStr::from_ptr(p_str).to_bytes())
+    std::ffi::CStr::from_ptr(p_str)
+        .to_str()
         .unwrap_or_else(|_| panic!("received non-utf8 string as {description}"))
         .into()
 }

src/lib.rs

@@ -289,8 +289,7 @@ impl<T> OptionalExtension<T> for Result<T> {
 }
 
 unsafe fn errmsg_to_string(errmsg: *const c_char) -> String {
-    let c_slice = CStr::from_ptr(errmsg).to_bytes();
-    String::from_utf8_lossy(c_slice).into_owned()
+    CStr::from_ptr(errmsg).to_string_lossy().into_owned()
 }
 
 fn str_to_cstring(s: &str) -> Result<SmallCString> {

src/session.rs

@@ -68,13 +68,8 @@ impl Session<'_> {
         where
             F: Fn(&str) -> bool + RefUnwindSafe,
         {
-            use std::str;
-
             let boxed_filter: *mut F = p_arg as *mut F;
-            let tbl_name = {
-                let c_slice = CStr::from_ptr(tbl_str).to_bytes();
-                str::from_utf8(c_slice)
-            };
+            let tbl_name = CStr::from_ptr(tbl_str).to_str();
             c_int::from(
                 catch_unwind(|| (*boxed_filter)(tbl_name.expect("non-utf8 table name")))
                     .unwrap_or_default(),
@@ -697,13 +692,8 @@ where
     F: Fn(&str) -> bool + Send + RefUnwindSafe + 'static,
     C: Fn(ConflictType, ChangesetItem) -> ConflictAction + Send + RefUnwindSafe + 'static,
 {
-    use std::str;
-
     let tuple: *mut (Option<F>, C) = p_ctx as *mut (Option<F>, C);
-    let tbl_name = {
-        let c_slice = CStr::from_ptr(tbl_str).to_bytes();
-        str::from_utf8(c_slice)
-    };
+    let tbl_name = CStr::from_ptr(tbl_str).to_str();
     match *tuple {
         (Some(ref filter), _) => c_int::from(
             catch_unwind(|| filter(tbl_name.expect("illegal table name"))).unwrap_or_default(),

src/statement.rs

@@ -441,7 +441,8 @@ impl Statement<'_> {
     #[inline]
     pub fn parameter_name(&self, index: usize) -> Option<&'_ str> {
         self.stmt.bind_parameter_name(index as i32).map(|name| {
-            str::from_utf8(name.to_bytes()).expect("Invalid UTF-8 sequence in parameter name")
+            name.to_str()
+                .expect("Invalid UTF-8 sequence in parameter name")
         })
     }
 
@@ -766,7 +767,7 @@ impl fmt::Debug for Statement<'_> {
         let sql = if self.stmt.is_null() {
             Ok("")
         } else {
-            str::from_utf8(self.stmt.sql().unwrap().to_bytes())
+            self.stmt.sql().unwrap().to_str()
         };
         f.debug_struct("Statement")
             .field("conn", self.conn)

src/trace.rs

@@ -27,10 +27,9 @@ use crate::Connection;
 #[cfg(not(feature = "loadable_extension"))]
 pub unsafe fn config_log(callback: Option<fn(c_int, &str)>) -> crate::Result<()> {
     extern "C" fn log_callback(p_arg: *mut c_void, err: c_int, msg: *const c_char) {
-        let c_slice = unsafe { CStr::from_ptr(msg).to_bytes() };
+        let s = unsafe { CStr::from_ptr(msg).to_string_lossy() };
         let callback: fn(c_int, &str) = unsafe { mem::transmute(p_arg) };
 
-        let s = String::from_utf8_lossy(c_slice);
         drop(catch_unwind(|| callback(err, &s)));
     }
 
@@ -72,8 +71,7 @@ impl Connection {
     pub fn trace(&mut self, trace_fn: Option<fn(&str)>) {
         unsafe extern "C" fn trace_callback(p_arg: *mut c_void, z_sql: *const c_char) {
             let trace_fn: fn(&str) = mem::transmute(p_arg);
-            let c_slice = CStr::from_ptr(z_sql).to_bytes();
-            let s = String::from_utf8_lossy(c_slice);
+            let s = CStr::from_ptr(z_sql).to_string_lossy();
             drop(catch_unwind(|| trace_fn(&s)));
         }
 
@@ -100,8 +98,7 @@ impl Connection {
             nanoseconds: u64,
         ) {
             let profile_fn: fn(&str, Duration) = mem::transmute(p_arg);
-            let c_slice = CStr::from_ptr(z_sql).to_bytes();
-            let s = String::from_utf8_lossy(c_slice);
+            let s = CStr::from_ptr(z_sql).to_string_lossy();
             const NANOS_PER_SEC: u64 = 1_000_000_000;
 
             let duration = Duration::new(