From 0e7ba080b4c33c1d5f99268328dbc981595cb6c3 Mon Sep 17 00:00:00 2001
From: Ben Noordhuis <info@bnoordhuis.nl>
Date: Mon, 29 Jul 2013 05:27:44 +0200
Subject: [PATCH] unix, windows: make buf arg to uv_fs_write const

Change the uv_fs_write() prototype so the 'buf' argument is now
`const void*` rather than `void*`.

The argument is stored in a non-const field in the uv_fs_t but that's
inconsequential because the memory it points to is not touched.
---
 include/uv.h  | 2 +-
 src/unix/fs.c | 4 ++--
 src/win/fs.c  | 4 ++--
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/include/uv.h b/include/uv.h
index 18fdb319..5c993b45 100644
--- a/include/uv.h
+++ b/include/uv.h
@@ -1632,7 +1632,7 @@ UV_EXTERN int uv_fs_unlink(uv_loop_t* loop, uv_fs_t* req, const char* path,
     uv_fs_cb cb);
 
 UV_EXTERN int uv_fs_write(uv_loop_t* loop, uv_fs_t* req, uv_file file,
-    void* buf, size_t length, int64_t offset, uv_fs_cb cb);
+    const void* buf, size_t length, int64_t offset, uv_fs_cb cb);
 
 UV_EXTERN int uv_fs_mkdir(uv_loop_t* loop, uv_fs_t* req, const char* path,
     int mode, uv_fs_cb cb);
diff --git a/src/unix/fs.c b/src/unix/fs.c
index 75b23437..142e4a0b 100644
--- a/src/unix/fs.c
+++ b/src/unix/fs.c
@@ -934,13 +934,13 @@ int uv_fs_utime(uv_loop_t* loop,
 int uv_fs_write(uv_loop_t* loop,
                 uv_fs_t* req,
                 uv_file file,
-                void* buf,
+                const void* buf,
                 size_t len,
                 int64_t off,
                 uv_fs_cb cb) {
   INIT(WRITE);
   req->file = file;
-  req->buf = buf;
+  req->buf = (void*) buf;
   req->len = len;
   req->off = off;
   POST;
diff --git a/src/win/fs.c b/src/win/fs.c
index 2ea2cb1c..9d4d7ff8 100644
--- a/src/win/fs.c
+++ b/src/win/fs.c
@@ -1521,12 +1521,12 @@ int uv_fs_read(uv_loop_t* loop, uv_fs_t* req, uv_file fd, void* buf,
 }
 
 
-int uv_fs_write(uv_loop_t* loop, uv_fs_t* req, uv_file fd, void* buf,
+int uv_fs_write(uv_loop_t* loop, uv_fs_t* req, uv_file fd, const void* buf,
     size_t length, int64_t offset, uv_fs_cb cb) {
   uv_fs_req_init(loop, req, UV_FS_WRITE, cb);
 
   req->fd = fd;
-  req->buf = buf;
+  req->buf = (void*) buf;
   req->length = length;
   req->offset = offset;