Re: System-dependent end-of-line

[Peng Zhicheng <pengzhicheng1986@...>]

于 2012-4-15 20:45, Dirk Laurie 写道:
> I'm in the unfamiliar position of having to be worried about
> whether my Lua program will run properly not only on a Linux
> system but on someone else's Windows or Macintosh.
>
> The program is a text filter: it reads a text file line by line,
> does something to the lines and writes it out.  I do the
> reading in using file:lines() which strips off end-of-line
> and the writing out by
>
>   io.write(table.concat(lines,'\n'))
>
> I suppose that "\n" should be system EOL.  I don't want to
> read off the input what that is; I want to write the proper EOL
> for the system on which Lua is running.

From my own understanding, Lua's io library is wrapped on the standard C stream IO APIs.

so the `io.write' function behaves just like the `fwrite' function of <stdio.h>

so it depends on the underlying C runtime.

IIRC, the MS C runtime would do the EOL translation if the file is opened in `text mode'.
while the Linux C runtime treats 'text mode' just the same as 'binary mode',
in another word, Linux don't have the `text mode' in effect.

so I think you can expect the correct behavior, as long you open files in 'text mode' instead of 'binrary mode'.

but you'd better do some experiments to be sure.