commit e6edec23718072ed7903be9dae37ae330a9d81d5
author Victor Stinner <victor.stinner@haypocalc.com> Tue Jan 04 00:29:35 2011 +0000
committer Victor Stinner <victor.stinner@haypocalc.com> Tue Jan 04 00:29:35 2011 +0000
tree dd43a4d1de61a8b0b49bef7f3fb299638f7aded9
parent 560f9dab55701654706b0d257d5d8f34f633bb52

Issue #9015, #9611: FileIO.readinto(), FileIO.write() and os.write() clamp the
length to 2^31-1 on Windows.

Modules/posixmodule.c

diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index d7891fa..0cd6340 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -5696,7 +5696,7 @@
 {
     Py_buffer pbuf;
     int fd;
-    Py_ssize_t size;
+    Py_ssize_t size, len;
 
     if (!PyArg_ParseTuple(args, "iy*:write", &fd, &pbuf))
         return NULL;
@@ -5704,8 +5704,15 @@
         PyBuffer_Release(&pbuf);
         return posix_error();
     }
+    len = pbuf.len;
     Py_BEGIN_ALLOW_THREADS
-    size = write(fd, pbuf.buf, (size_t)pbuf.len);
+#if defined(MS_WIN64) || defined(MS_WINDOWS)
+    if (len > INT_MAX)
+        len = INT_MAX;
+    size = write(fd, pbuf.buf, (int)len);
+#else
+    size = write(fd, pbuf.buf, (size_t)len);
+#endif
     Py_END_ALLOW_THREADS
     PyBuffer_Release(&pbuf);
     if (size < 0)