OpenEuphoria

file comparing

• Posted by Greg Phillips <i.shoot at REDNECKS.COM> Jan 02, 1999
• 465 views

I wrote this little program a little while back, because I needed
something that worked like the old DOS program, compare.  This works
great, until you try to compare two large files (I assume because the
program runs out of memory).  Is there any way I can avoid this?

I know I could use getc(), but wouldn't that also be really slow, for
large files?
Also, I know I could use getc() to maybe return the exact bytes that are
different, but how would I go about that?


---------------includex.e-----------------
include get.e
sequence input_data1, input_data2, cmd, path
integer file1, file2

cmd = command_line()

if length(cmd) < 3 then
      puts( 1, "Usage: comparex filename1 filename2\n")
      abort(0)
    end if

puts( 1, "\nComparing the following files:\n")
    path = {}
    for i = 3 to length(cmd) do
      path = append( path, cmd[i] )
      printf( 1, "File %d: %s\n", { i-2, path[i-2]})
    end for
file1 = open(cmd[3], "rb")
file2 = open(cmd[4], "rb")
if file1 = -1 and file2 = -1 then
     puts(1,"\nError opening files\n\n")
end if
input_data1 = gets(file1)
input_data2 = gets(file2)

if compare(input_data1,input_data2) = 0 then
     puts(1, "\n     These files are the same\n")
else
     puts(1, "\n     These files are not the same\n")
end if
close(file1)
close(file2)


--
Greg Phillips
i.shoot at rednecks.com
http://euphoria.server101.com
--

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