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diff --git a/lib/python2.7/Tools/scripts/fixcid.py b/lib/python2.7/Tools/scripts/fixcid.py
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+++ b/lib/python2.7/Tools/scripts/fixcid.py
@@ -0,0 +1,316 @@
+#!/usr/bin/env python2
+
+# Perform massive identifier substitution on C source files.
+# This actually tokenizes the files (to some extent) so it can
+# avoid making substitutions inside strings or comments.
+# Inside strings, substitutions are never made; inside comments,
+# it is a user option (off by default).
+#
+# The substitutions are read from one or more files whose lines,
+# when not empty, after stripping comments starting with #,
+# must contain exactly two words separated by whitespace: the
+# old identifier and its replacement.
+#
+# The option -r reverses the sense of the substitutions (this may be
+# useful to undo a particular substitution).
+#
+# If the old identifier is prefixed with a '*' (with no intervening
+# whitespace), then it will not be substituted inside comments.
+#
+# Command line arguments are files or directories to be processed.
+# Directories are searched recursively for files whose name looks
+# like a C file (ends in .h or .c).  The special filename '-' means
+# operate in filter mode: read stdin, write stdout.
+#
+# Symbolic links are always ignored (except as explicit directory
+# arguments).
+#
+# The original files are kept as back-up with a "~" suffix.
+#
+# Changes made are reported to stdout in a diff-like format.
+#
+# NB: by changing only the function fixline() you can turn this
+# into a program for different changes to C source files; by
+# changing the function wanted() you can make a different selection of
+# files.
+
+import sys
+import re
+import os
+from stat import *
+import getopt
+
+err = sys.stderr.write
+dbg = err
+rep = sys.stdout.write
+
+def usage():
+    progname = sys.argv[0]
+    err('Usage: ' + progname +
+              ' [-c] [-r] [-s file] ... file-or-directory ...\n')
+    err('\n')
+    err('-c           : substitute inside comments\n')
+    err('-r           : reverse direction for following -s options\n')
+    err('-s substfile : add a file of substitutions\n')
+    err('\n')
+    err('Each non-empty non-comment line in a substitution file must\n')
+    err('contain exactly two words: an identifier and its replacement.\n')
+    err('Comments start with a # character and end at end of line.\n')
+    err('If an identifier is preceded with a *, it is not substituted\n')
+    err('inside a comment even when -c is specified.\n')
+
+def main():
+    try:
+        opts, args = getopt.getopt(sys.argv[1:], 'crs:')
+    except getopt.error, msg:
+        err('Options error: ' + str(msg) + '\n')
+        usage()
+        sys.exit(2)
+    bad = 0
+    if not args: # No arguments
+        usage()
+        sys.exit(2)
+    for opt, arg in opts:
+        if opt == '-c':
+            setdocomments()
+        if opt == '-r':
+            setreverse()
+        if opt == '-s':
+            addsubst(arg)
+    for arg in args:
+        if os.path.isdir(arg):
+            if recursedown(arg): bad = 1
+        elif os.path.islink(arg):
+            err(arg + ': will not process symbolic links\n')
+            bad = 1
+        else:
+            if fix(arg): bad = 1
+    sys.exit(bad)
+
+# Change this regular expression to select a different set of files
+Wanted = r'^[a-zA-Z0-9_]+\.[ch]$'
+def wanted(name):
+    return re.match(Wanted, name)
+
+def recursedown(dirname):
+    dbg('recursedown(%r)\n' % (dirname,))
+    bad = 0
+    try:
+        names = os.listdir(dirname)
+    except os.error, msg:
+        err(dirname + ': cannot list directory: ' + str(msg) + '\n')
+        return 1
+    names.sort()
+    subdirs = []
+    for name in names:
+        if name in (os.curdir, os.pardir): continue
+        fullname = os.path.join(dirname, name)
+        if os.path.islink(fullname): pass
+        elif os.path.isdir(fullname):
+            subdirs.append(fullname)
+        elif wanted(name):
+            if fix(fullname): bad = 1
+    for fullname in subdirs:
+        if recursedown(fullname): bad = 1
+    return bad
+
+def fix(filename):
+##  dbg('fix(%r)\n' % (filename,))
+    if filename == '-':
+        # Filter mode
+        f = sys.stdin
+        g = sys.stdout
+    else:
+        # File replacement mode
+        try:
+            f = open(filename, 'r')
+        except IOError, msg:
+            err(filename + ': cannot open: ' + str(msg) + '\n')
+            return 1
+        head, tail = os.path.split(filename)
+        tempname = os.path.join(head, '@' + tail)
+        g = None
+    # If we find a match, we rewind the file and start over but
+    # now copy everything to a temp file.
+    lineno = 0
+    initfixline()
+    while 1:
+        line = f.readline()
+        if not line: break
+        lineno = lineno + 1
+        while line[-2:] == '\\\n':
+            nextline = f.readline()
+            if not nextline: break
+            line = line + nextline
+            lineno = lineno + 1
+        newline = fixline(line)
+        if newline != line:
+            if g is None:
+                try:
+                    g = open(tempname, 'w')
+                except IOError, msg:
+                    f.close()
+                    err(tempname+': cannot create: '+
+                        str(msg)+'\n')
+                    return 1
+                f.seek(0)
+                lineno = 0
+                initfixline()
+                rep(filename + ':\n')
+                continue # restart from the beginning
+            rep(repr(lineno) + '\n')
+            rep('< ' + line)
+            rep('> ' + newline)
+        if g is not None:
+            g.write(newline)
+
+    # End of file
+    if filename == '-': return 0 # Done in filter mode
+    f.close()
+    if not g: return 0 # No changes
+    g.close()
+
+    # Finishing touch -- move files
+
+    # First copy the file's mode to the temp file
+    try:
+        statbuf = os.stat(filename)
+        os.chmod(tempname, statbuf[ST_MODE] & 07777)
+    except os.error, msg:
+        err(tempname + ': warning: chmod failed (' + str(msg) + ')\n')
+    # Then make a backup of the original file as filename~
+    try:
+        os.rename(filename, filename + '~')
+    except os.error, msg:
+        err(filename + ': warning: backup failed (' + str(msg) + ')\n')
+    # Now move the temp file to the original file
+    try:
+        os.rename(tempname, filename)
+    except os.error, msg:
+        err(filename + ': rename failed (' + str(msg) + ')\n')
+        return 1
+    # Return success
+    return 0
+
+# Tokenizing ANSI C (partly)
+
+Identifier = '(struct )?[a-zA-Z_][a-zA-Z0-9_]+'
+String = r'"([^\n\\"]|\\.)*"'
+Char = r"'([^\n\\']|\\.)*'"
+CommentStart = r'/\*'
+CommentEnd = r'\*/'
+
+Hexnumber = '0[xX][0-9a-fA-F]*[uUlL]*'
+Octnumber = '0[0-7]*[uUlL]*'
+Decnumber = '[1-9][0-9]*[uUlL]*'
+Intnumber = Hexnumber + '|' + Octnumber + '|' + Decnumber
+Exponent = '[eE][-+]?[0-9]+'
+Pointfloat = r'([0-9]+\.[0-9]*|\.[0-9]+)(' + Exponent + r')?'
+Expfloat = '[0-9]+' + Exponent
+Floatnumber = Pointfloat + '|' + Expfloat
+Number = Floatnumber + '|' + Intnumber
+
+# Anything else is an operator -- don't list this explicitly because of '/*'
+
+OutsideComment = (Identifier, Number, String, Char, CommentStart)
+OutsideCommentPattern = '(' + '|'.join(OutsideComment) + ')'
+OutsideCommentProgram = re.compile(OutsideCommentPattern)
+
+InsideComment = (Identifier, Number, CommentEnd)
+InsideCommentPattern = '(' + '|'.join(InsideComment) + ')'
+InsideCommentProgram = re.compile(InsideCommentPattern)
+
+def initfixline():
+    global Program
+    Program = OutsideCommentProgram
+
+def fixline(line):
+    global Program
+##  print '-->', repr(line)
+    i = 0
+    while i < len(line):
+        match = Program.search(line, i)
+        if match is None: break
+        i = match.start()
+        found = match.group(0)
+##      if Program is InsideCommentProgram: print '...',
+##      else: print '   ',
+##      print found
+        if len(found) == 2:
+            if found == '/*':
+                Program = InsideCommentProgram
+            elif found == '*/':
+                Program = OutsideCommentProgram
+        n = len(found)
+        if found in Dict:
+            subst = Dict[found]
+            if Program is InsideCommentProgram:
+                if not Docomments:
+                    print 'Found in comment:', found
+                    i = i + n
+                    continue
+                if found in NotInComment:
+##                  print 'Ignored in comment:',
+##                  print found, '-->', subst
+##                  print 'Line:', line,
+                    subst = found
+##              else:
+##                  print 'Substituting in comment:',
+##                  print found, '-->', subst
+##                  print 'Line:', line,
+            line = line[:i] + subst + line[i+n:]
+            n = len(subst)
+        i = i + n
+    return line
+
+Docomments = 0
+def setdocomments():
+    global Docomments
+    Docomments = 1
+
+Reverse = 0
+def setreverse():
+    global Reverse
+    Reverse = (not Reverse)
+
+Dict = {}
+NotInComment = {}
+def addsubst(substfile):
+    try:
+        fp = open(substfile, 'r')
+    except IOError, msg:
+        err(substfile + ': cannot read substfile: ' + str(msg) + '\n')
+        sys.exit(1)
+    lineno = 0
+    while 1:
+        line = fp.readline()
+        if not line: break
+        lineno = lineno + 1
+        try:
+            i = line.index('#')
+        except ValueError:
+            i = -1          # Happens to delete trailing \n
+        words = line[:i].split()
+        if not words: continue
+        if len(words) == 3 and words[0] == 'struct':
+            words[:2] = [words[0] + ' ' + words[1]]
+        elif len(words) != 2:
+            err(substfile + '%s:%r: warning: bad line: %r' % (substfile, lineno, line))
+            continue
+        if Reverse:
+            [value, key] = words
+        else:
+            [key, value] = words
+        if value[0] == '*':
+            value = value[1:]
+        if key[0] == '*':
+            key = key[1:]
+            NotInComment[key] = value
+        if key in Dict:
+            err('%s:%r: warning: overriding: %r %r\n' % (substfile, lineno, key, value))
+            err('%s:%r: warning: previous: %r\n' % (substfile, lineno, Dict[key]))
+        Dict[key] = value
+    fp.close()
+
+if __name__ == '__main__':
+    main()