Commit 4fcb479de95775d056f378fdf8a0b9570bc315b7 | zig

author	Andrew Kelley <andrew@ziglang.org> 2025-07-22 18:42:54-07:00
committer	Andrew Kelley <andrew@ziglang.org> 2025-07-22 18:42:54-07:00
log	4fcb479de95775d056f378fdf8a0b9570bc315b7
tree	a2a502cdedeb4b53dd2e6b22119a10c38e468391
parent	6038192fadbd785894368d483e98b9713b746135

2 files changed, 6 insertions(+), 2 deletions(-)

lib/std/Io.zig+3-1

 @@ -334,10 +334,12 @@ pub fn GenericReader(
             fn stream(r: *Reader, w: *Writer, limit: Limit) Reader.StreamError!usize {
                 const a: *@This() = @alignCast(@fieldParentPtr("new_interface", r));
                 const buf = limit.slice(try w.writableSliceGreedy(1));
-                return a.derp_reader.read(buf) catch |err| {
+                const n = a.derp_reader.read(buf) catch |err| {
                     a.err = err;
                     return error.ReadFailed;
                 };
+                w.advance(n);
+                return n;
             }
         };
     };

lib/std/Io/DeprecatedReader.zig+3-1

 @@ -393,10 +393,12 @@ pub const Adapter = struct {
     fn stream(r: *std.io.Reader, w: *std.io.Writer, limit: std.io.Limit) std.io.Reader.StreamError!usize {
         const a: *@This() = @alignCast(@fieldParentPtr("new_interface", r));
         const buf = limit.slice(try w.writableSliceGreedy(1));
-        return a.derp_reader.read(buf) catch |err| {
+        const n = a.derp_reader.read(buf) catch |err| {
             a.err = err;
             return error.ReadFailed;
         };
+        w.advance(n);
+        return n;
     }
 };