[Python-checkins] cpython (2.7): Issue #16367: Fix FileIO.readall() on Windows for files larger than 2 GB

[victor.stinner]

http://hg.python.org/cpython/rev/f26c91bf61bf
changeset:   81269:f26c91bf61bf
branch:      2.7
parent:      81263:7cf4ea64f603
user:        Victor Stinner <victor.stinner at gmail.com>
date:        Thu Jan 03 03:33:21 2013 +0100
summary:
  Issue #16367: Fix FileIO.readall() on Windows for files larger than 2 GB

files:
  Misc/NEWS            |   2 ++
  Modules/_io/fileio.c |  13 +++++++++++--
  2 files changed, 13 insertions(+), 2 deletions(-)


diff --git a/Misc/NEWS b/Misc/NEWS
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -9,6 +9,8 @@
 Core and Builtins
 -----------------
 
+- Issue #16367: Fix FileIO.readall() on Windows for files larger than 2 GB.
+
 - Issue #15516: Fix a bug in PyString_FromFormat where it failed to properly
   ignore errors from a __int__() method.
 
diff --git a/Modules/_io/fileio.c b/Modules/_io/fileio.c
--- a/Modules/_io/fileio.c
+++ b/Modules/_io/fileio.c
@@ -530,7 +530,7 @@
 {
     PyObject *result;
     Py_ssize_t total = 0;
-    int n;
+    Py_ssize_t n;
 
     if (self->fd < 0)
         return err_closed();
@@ -563,9 +563,18 @@
         }
         Py_BEGIN_ALLOW_THREADS
         errno = 0;
+        n = newsize - total;
+#if defined(MS_WIN64) || defined(MS_WINDOWS)
+        if (n > INT_MAX)
+            n = INT_MAX;
         n = read(self->fd,
                  PyBytes_AS_STRING(result) + total,
-                 newsize - total);
+                 (int)n);
+#else
+        n = read(self->fd,
+                 PyBytes_AS_STRING(result) + total,
+                 n);
+#endif
         Py_END_ALLOW_THREADS
         if (n == 0)
             break;

-- 
Repository URL: http://hg.python.org/cpython