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Subject: Re: ANNOUNCE: DJGPP port of Lua 5.2.2 uploaded.
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Hi,

On Sunday, August 18, 2013 1:30:21 PM UTC-5, Juan Manuel Guerrero wrote:
>
> This is a port of Lua 5.2.2 to MSDOS/DJGPP.
> 
>    - The port has been test with the test suite available as:
> 
>        http://www.lua.org/tests/5.2/lua-5.2.2-tests.tar.gz
> 
>      After having installed lua, run the test suite by cd-ing into
>      lua-5.2.2-tests directory and starting the lua test script with
>      the command:
> 
>        lua -e"_U=true" all.lua
> 
>      No check will fail.  The final output should look like this:
> 
> test done on 18/08/2013, at 18:05:05
> Lua 5.2
> final OK !!!
> cleaning all!!!!
>      ---- total memory: 27.7K, max memory: 1.6M ----
> 
> total time: 4.78
> 
>  >>> closing state <<<

First of all, thanks for your work on this.

But there seems to be some (very) minor issues running the test suite, at
least under native FreeDOS. Under DOSEMU, it indeed passes entirely. I don't
know what environment you tested under (XP? Vista? MS-DOS?), so while you're
of course right to say it passed okay, I feel it's best to mention this to
you here.

I suspect it's just minor libc handling differences, similar to what you 
already noticed recently. The problematic lines are in files.lua : 465, 470,
and 478:

  assert(fr:read("*all") == "x")   -- `close' flushes it
  ...
  assert(fr:read("*all") == "x")  -- no buffer; output is ready
  ...
  assert(fr:read("*all") == "xa\n")  -- now we have a whole line

Here's my guess at why this is failing:

Lines 458 and 459 open the same "file" for "w" (write, as "f") and
"r" (read, as "fr"). "f" is closed and "fr" seeks to beginning.
Apparently they are assuming that the written file "f" is properly
flushed via "close" and that "fr" (still open) can correctly read a
char from it.

It's probably easier to just quote files.lua (lines 456-81) itself:

-- testing buffers
do
  local f = assert(io.open(file, "w"))
  local fr = assert(io.open(file, "r"))
  assert(f:setvbuf("full", 2000))
  f:write("x")
  assert(fr:read("*all") == "")  -- full buffer; output not written yet
  f:close()
  fr:seek("set")
  assert(fr:read("*all") == "x")   -- `close' flushes it
  f = assert(io.open(file), "w")
  assert(f:setvbuf("no"))
  f:write("x")
  fr:seek("set")
  assert(fr:read("*all") == "x")  -- no buffer; output is ready
  f:close()
  f = assert(io.open(file, "a"))
  assert(f:setvbuf("line"))
  f:write("x")
  fr:seek("set", 1)
  assert(fr:read("*all") == "")   -- line buffer; no output without `\n'
  f:write("a\n"):seek("set", 1)
  assert(fr:read("*all") == "xa\n")  -- now we have a whole line
  f:close(); fr:close()
  assert(os.remove(file))
end