fix issue with pysvp64dis.py load() reading from stdin

take a copy of the input and allow "seek()" on the copy (BytesIO)

diff --git a/src/openpower/sv/trans/pysvp64dis.py b/src/openpower/sv/trans/pysvp64dis.py
index 837041da1ac9edbfeab150a4f3a272911b10aa9e..d5ddba91042557f3423d5093e085ea9809f2512f 100644 (file)
--- a/src/openpower/sv/trans/pysvp64dis.py
+++ b/src/openpower/sv/trans/pysvp64dis.py
@@ -2,6 +2,7 @@ import argparse as _argparse
 import enum as _enum
 import sys as _sys
 import os
+from io import BytesIO
 
 from openpower.decoder.power_enums import (
     find_wiki_dir as _find_wiki_dir,
@@ -25,10 +26,14 @@ class ByteOrder(_enum.Enum):
 
 def load(ifile, byteorder=ByteOrder.LITTLE, **_):
     byteorder = str(byteorder)
-    curpos = ifile.tell() # get file position
+
+    # copy over to persistent binfile (BytesIO)
+    cpfile = BytesIO()
+    cpfile.write(ifile.read())
+    cpfile.seek(0)
 
     while True:
-        insn = ifile.read(4)
+        insn = cpfile.read(4)
         length = len(insn)
         if length == 0:
             return
@@ -36,7 +41,7 @@ def load(ifile, byteorder=ByteOrder.LITTLE, **_):
             raise IOError(insn)
         insn = _WordInstruction.integer(value=insn, byteorder=byteorder)
         if insn.po == 0x1:
-            suffix = ifile.read(4)
+            suffix = cpfile.read(4)
             length = len(suffix)
             if length == 0:
                 yield insn
@@ -51,7 +56,7 @@ def load(ifile, byteorder=ByteOrder.LITTLE, **_):
                 insn = _PrefixedInstruction.pair(prefix=prefix, suffix=suffix)
         yield insn
 
-    ifile.seek(curpos) # restore position so that generator can be reused
+    cpfile.seek(0) # restore position so that generator can be reused
 
 
 def dump(insns, verbosity, **_):