Add function to grokdump shell to print ASCII string.

tools/grokdump.py

Index: tools/grokdump.py
diff --git a/tools/grokdump.py b/tools/grokdump.py
index 59a2a48716d536af5101f479aeb0032f0b6a7179..e6141be56603ceac513a91508cee2412fcf89459 100755
--- a/tools/grokdump.py
+++ b/tools/grokdump.py
@@ -1591,6 +1591,25 @@ class InspectionShell(cmd.Cmd):
                                       size)
     print "Available memory regions:"
     self.reader.ForEachMemoryRegion(print_region)
+    
+  def do_ascii(self, address):

[Michael Starzinger, 2012/07/03 11:43:16]

How about naming this command "dascii" or just "da", because it belongs to the
"dump" category.

[Yang, 2012/07/03 11:51:11]

Done.

+    """
+    Print ASCII string starting at specified address.

[Michael Starzinger, 2012/07/03 11:43:16]

Indent that by one space for consistency.

[Yang, 2012/07/03 11:51:11]

Done.

+    """
+    address = int(address, 16)
+    string = ""
+    while self.reader.IsValidAddress(address):
+      code = self.reader.ReadU8(address)
+      if code < 128:
+        string += chr(code)
+      else:
+        break
+      address += 1
+      
+    if string == "":
+      print "Not an ASCII string at %s" % self.reader.FormatIntPtr(address)
+    else:
+      print "%s" % string

[Michael Starzinger, 2012/07/03 11:43:16]

Maybe we should put parentheses around the string. I am not sure about that,
I'll leave it up to you.

[Yang, 2012/07/03 11:51:11]

Quotes don't work that well since the string may not terminate cleanly (I don't
try to detect null termination, but assume the string to terminate when the
ASCII content ends).

 
 
 EIP_PROXIMITY = 64