win32utils devel - Apr 2008 - Global substitution with win32-mmap

Hi all,

I''m trying to figure out how to do an inline file substitute/replace 
using the address. In short, I''m trying to replace
"assert_raises" with
"assert_raise" throughout a file.

I tried this:

require ''win32/mmap''
require ''windows/msvcrt/string''
require ''windows/msvcrt/buffer''
include Win32
include Windows::MSVCRT::String
include Windows::MSVCRT::Buffer

StrlenL = API.new(''strlen'', ''L'',
''L'', ''msvcrt'')

MMap.new(:file => ''test.rb'') do |addr|
    old_str = ''assert_raises''
    old_len = old_str.length
    new_str = ''assert_raise''
    new_len = new_str.length

    ptr1 = ptr2 = ptr3 =
[strstr(addr,old_str)].pack(''p*'').unpack(''l'')[0]

    while ptr1 && ptr1 != 0
       ptr2 += new_len
       ptr3 += old_len
       memmove(ptr2, ptr3, 1 + StrlenL.call(ptr3))
       memcpy(ptr1, new_str, new_len)
       ptr1 = ptr2 = ptr3 = [strstr(ptr2, 
old_str)].pack(''p*'').unpack(''l'')[0]
    end
end

I based it off of this thread:

http://tinyurl.com/5qvbnw

But, that doesn''t seem to be working. Any ideas?

Thanks,

Dan

# test.rb
class Foo < Test::Unit::TestCase
    def setup
       @foo = Foo.new
    end

    def test_bar_expected_errors
       assert_raises(ArgumentError){ 1 == 2 }
       assert_raise(StandardError){ 2 == 1 }
    end

    def test_foo_expected_errors
       assert_raises(ArgumentError){ 1 == 2 }
       assert_raise(StandardError){ 2 == 1 }
    end

    def teardown
       @foo = nil
    end
en

Hi,

2008/4/22, Daniel Berger <djberg96 at gmail.com>:
>
> Hi all,
>
> I''m trying to figure out how to do an inline file
substitute/replace
> using the address. In short, I''m trying to replace
"assert_raises" with
> "assert_raise" throughout a file.
>
> I tried this:
>
> require ''win32/mmap''
> require ''windows/msvcrt/string''
> require ''windows/msvcrt/buffer''
> include Win32
> include Windows::MSVCRT::String
> include Windows::MSVCRT::Buffer
>
> StrlenL = API.new(''strlen'', ''L'',
''L'', ''msvcrt'')
>
> MMap.new(:file => ''test.rb'') do |addr|
>    old_str = ''assert_raises''
>    old_len = old_str.length
>    new_str = ''assert_raise''
>    new_len = new_str.length
>
>    ptr1 = ptr2 = ptr3 =
[strstr(addr,old_str)].pack(''p*'').unpack(''l'')[0]
>
>    while ptr1 && ptr1 != 0
>       ptr2 += new_len
>       ptr3 += old_len
>       memmove(ptr2, ptr3, 1 + StrlenL.call(ptr3))
>       memcpy(ptr1, new_str, new_len)
>       ptr1 = ptr2 = ptr3 = [strstr(ptr2,
> old_str)].pack(''p*'').unpack(''l'')[0]
>    end
> end
>
> I based it off of this thread:
>
> http://tinyurl.com/5qvbnw
>
> But, that doesn''t seem to be working. Any ideas?


You must define strstr like this:
         Strstr   = API.new(''strstr'', ''LP'',
''L'', ''msvcrt'')

and try this:

StrlenL = API.new(''strlen'', ''L'',
''L'', ''msvcrt'')

MMap.new(:file => ''test.rb'') do |addr|
   old_str = ''assert_raises''
   old_len = old_str.length
   new_str = ''assert_raise''
   new_len = new_str.length

   ptr1 = ptr2 = ptr3 = strstr(addr,old_str)
   while ptr1 && ptr1 != 0
      ptr2 += new_len
      ptr3 += old_len
      memmove(ptr2, ptr3, 1 + StrlenL.call(ptr3))
      memcpy(ptr1, new_str, new_len)
      ptr1 = ptr2 = ptr3 = strstr(ptr2,old_str)
   end
end
Regads,

Park Heesob
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