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From: Georg Bauhaus <bauhaus@futureapps.invalid>
Newsgroups: comp.lang.ada
Subject: Re: Annoying behavior
Date: Sat, 25 Apr 2015 21:30:43 +0200
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Date: 2015-04-25T21:30:43+02:00
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On 25.04.15 20:58, Laurent wrote:

> The Show Invisibles isn't bad but I thought more in the direction of <eol> and not this sign which I have no idea how it is called. Probably not necessary at all but better have something you don't need than the opposite.

In case you are a little familiar with a command line interface
to an OS, then on a Mac, open Terminal, and cd to the directory
where your files are stored. Type the "file" command and put a name
of at least one file in question after the program's name. Then,
type ENTER (I have here two files, both having one line with the
word "Hello" on it):

$ file dos.txt unix.txt
dos.txt:  ASCII text, with CRLF line terminators
unix.txt: ASCII text
$

A closer look at what is in a file is possible using the od program
(octal dump) and its -c (character) switch:

$ od -c dos.txt
0000000    H   e   l   l   o  \r  \n
0000007
$

> Which makes me wonder if it matters which line endings I use. Classic Mac is CR, Unix LF and Windows CRLF.
>
> Just tried it. Makes indeed a difference. Which means that if I ever wanted to port my little program to an other OS, I have to think to modify the text file.

One way to distribute text files is in a ZIP: unzip programs typically
feature a switch that allows automatic translation of line endings
when unpacking. The unpacked text files then follow the OS's conventions.


> Something which would make me search for hours to find the error in my code which is correct but it is the stupid text file which causes the problem.
>
> How does the Text_IO "know" which line ending to use?

GNAT's Text_IO works better with lines that follow the OS's conventions
for EOL.