[GAP] LF to CR-LF

[Daniel Lewandowski]

Dnia 28-08-2006, pon o godzinie 08:54 -0400, Robert Dewar napisał(a):
> Because by default Text_IO files are opened in the mode where the
> OS changes any occurrence of LF to CR/LF, which seems to be the best
> default choice. If you look at your program:
> 
>          procedure S is
>             File : File_Type;
>             Line : constant String := "ala ma" & Latin_1.Lf & " kota";
>          begin
>             Create (File => File, Name => "out.txt", Mode => Out_File);
>             Put_Line (File => File, Item => Line);
>             Close (File => File);
>          end S;
> 
> On a Unix system this would create a standard format text file with
> two lines. With the default interpretation we have chosen, this
> program will have the same effect in a DOS type environment.
> 
> If we chose to output the LF on its own, the resulting file would not be
> a standard format text file.

I understand this. But the real problem is in case the string contains
CR & LF. Text_IO sees LF and inserts CR before it. As a result I have CR
& CR & LF in a "standard" text file. Some applications really don't like
this line terminator.

> If you want the effect of LF's without CR's, you could get this by
> manually opening the C stream with appropriate options, but then the
> marker at the end of all lines would be simply LF.
Not so elegant but I will try this. I can manually add CR at the end of
a string.

Regards,
Daniel Lewandowski