commit c5af7730e34f15d917730c66076125d4e545f11a
author Victor Stinner <victor.stinner@haypocalc.com> Tue Oct 11 23:00:31 2011 +0200
committer Victor Stinner <victor.stinner@haypocalc.com> Tue Oct 11 23:00:31 2011 +0200
tree 9ec4c70c1b7240708ec19bf37447a85e9194cf40
parent 950468e5532e2af6bbda8e953854fe74d45aa9f0

Fix FileIO.readall() (new_buffersize()) for large files

Truncate the buffer size to PY_SSIZE_T_MAX.

Modules/_io/fileio.c

diff --git a/Modules/_io/fileio.c b/Modules/_io/fileio.c
index dc59455..ba5e096 100644
--- a/Modules/_io/fileio.c
+++ b/Modules/_io/fileio.c
@@ -564,7 +564,11 @@
         */
         if (end >= SMALLCHUNK && end >= pos && pos >= 0) {
             /* Add 1 so if the file were to grow we'd notice. */
-            return currentsize + end - pos + 1;
+            Py_off_t bufsize = currentsize + end - pos + 1;
+            if (bufsize < PY_SSIZE_T_MAX)
+                return (size_t)bufsize;
+            else
+                return PY_SSIZE_T_MAX;
         }
     }
 #endif