From 74537d36cd9a32817d18163cccdb60f88b024950 Mon Sep 17 00:00:00 2001
From: "Luke T. Shumaker" <lukeshu@lukeshu.com>
Date: Fri, 11 Oct 2024 13:11:27 -0600
Subject: lib9p: Implement Twrite

---
 lib9p/srv.c | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

(limited to 'lib9p')

diff --git a/lib9p/srv.c b/lib9p/srv.c
index a931106..610debf 100644
--- a/lib9p/srv.c
+++ b/lib9p/srv.c
@@ -718,6 +718,7 @@ static void handle_Topen(struct _lib9p_srv_req *ctx,
 		}
 	}
 
+	/* Variables.  */
 	lib9p_o_t              reqmode  = req->mode;
 	uint8_t                fidflags = fidinfo->flags;
 	struct lib9p_srv_file *file     = fidinfo->file;
@@ -801,9 +802,11 @@ static void handle_Tread(struct _lib9p_srv_req *ctx,
 		return;
 	}
 
+	/* Variables.  */
 	struct lib9p_srv_file *file = fidinfo->file;
 	resp->data.dat = (char *)(&resp[1]);
 
+	/* Do it.  */
 	if (fidinfo->flags & FIDFLAG_ISDIR) {
 		size_t idx;
 		if (req->offset == 0)
@@ -835,8 +838,24 @@ static void handle_Twrite(struct _lib9p_srv_req *ctx,
                           struct lib9p_msg_Rwrite *resp) {
 	handler_common(ctx, req, resp);
 
-	lib9p_error(&ctx->ctx.basectx,
-	            LINUX_EOPNOTSUPP, "write not yet implemented");
+	/* Check that the FID is valid for this.  */
+	struct _srv_fidinfo *fidinfo = fidmap_load(&ctx->parent_sess->fids, req->fid);
+	if (!fidinfo) {
+		lib9p_errorf(&ctx->ctx.basectx,
+		             LINUX_EBADF, "bad file number %"PRIu32, req->fid);
+		return;
+	}
+	if (!(fidinfo->flags & FIDFLAG_OPEN_W)) {
+		lib9p_error(&ctx->ctx.basectx,
+		            LINUX_EINVAL, "FID not open for writing");
+		return;
+	}
+
+	/* Variables.  */
+	struct lib9p_srv_file *file = fidinfo->file;
+
+	/* Do it.  */
+	resp->count = file->vtable->pwrite(&ctx->ctx, file, req->data.dat, req->data.len, req->offset);
 }
 
 static void handle_Tclunk(struct _lib9p_srv_req *ctx,
-- 
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