[tor-commits] [tor/master] rust: Refactor Rust impl of protover_all_supported().

[nickm at torproject.org]

commit c7bcca0233d1d4c9805f78da5e7186be2c1bcdca
Author: Isis Lovecruft <isis at torproject.org>
Date:   Wed Mar 21 02:45:41 2018 +0000

    rust: Refactor Rust impl of protover_all_supported().
    
    This includes differences in behaviour to before, which should now more closely
    match the C version:
    
     - If parsing a protover `char*` from C, and the string is not parseable, this
       function will return 1 early, which matches the C behaviour when protocols
       are unparseable.  Previously, we would parse it and its version numbers
       simultaneously, i.e. there was no fail early option, causing us to spend more
       time unnecessarily parsing versions.
    
     * REFACTOR `protover::ffi::protover_all_supported()` to use new types and
       methods.
---
 src/rust/protover/ffi.rs | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/src/rust/protover/ffi.rs b/src/rust/protover/ffi.rs
index ce2837832..c17696803 100644
--- a/src/rust/protover/ffi.rs
+++ b/src/rust/protover/ffi.rs
@@ -59,19 +59,26 @@ pub extern "C" fn protover_all_supported(
         Err(_) => return 1,
     };
 
-    let (is_supported, unsupported) = all_supported(relay_version);
+    let relay_proto_entry: UnvalidatedProtoEntry = match relay_version.parse() {
+        Ok(n)  => n,
+        Err(_) => return 1,
+    };
+    let maybe_unsupported: Option<UnvalidatedProtoEntry> = relay_proto_entry.all_supported();
 
-    if unsupported.len() > 0 {
-        let c_unsupported = match CString::new(unsupported) {
+    if maybe_unsupported.is_some() {
+        let unsupported: UnvalidatedProtoEntry = maybe_unsupported.unwrap();
+        let c_unsupported: CString = match CString::new(unsupported.to_string()) {
             Ok(n) => n,
             Err(_) => return 1,
         };
 
         let ptr = c_unsupported.into_raw();
         unsafe { *missing_out = ptr };
+
+        return 0;
     }
 
-    return if is_supported { 1 } else { 0 };
+    1
 }
 
 /// Provide an interface for C to translate arguments and return types for