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Date: Mon, 22 Feb 2010 11:24:21 +0100
From: Georg Bauhaus <rm-host.bauhaus@maps.futureapps.de>
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Newsgroups: comp.lang.ada
Subject: Re: Does ada have a sscanf equivalent?
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Date: 2010-02-22T11:24:26+01:00
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On 2/22/10 10:08 AM, J.s wrote:
> I am trying to translate some C code that parses a string into numbers
> (both Integers and Floats) from an input file. Would it be easiest to
> just import the C function or is there an Ada equivalent? (I found a
> package but I don't think I understand how it works:
> http://www.web-port.net/Christfried.Webers/sources/flex/s-valrea__ads.htm)

Don't use this package, it is internal to this compiler,
like most packages from the System.* hierchy are not
intended for general use such as scanning text.

Instead, have a look at the Ada.Text_IO hierachy,
the generic packages for integer types and floating
point types should provide the necessary subprograms.
(Also note that with each basic type you get its attributes,
including "attribute functions" like 'Image and 'Value.)

One way I would write this is
   read one Line,
   find the index K of the first space,
   use IIO.Get (with string parameter Line(K .. Line'Last)
    to read an integer from the line starting at character
    index K, where IIO is an instance of Integer_IO;
    this moves K
   do the same for the following floating point numbers
    calling subs from an instance of Float_IO
   and the again employing IIO

For more extensive parsing needs, for example using pattern
matching, there are a number of libraries, including
standard Ada ones. But they are not needed here, I think.

Do you have a good text book? It should explain this
in some I/O chapter.

> Input file:
>          . . .
> 	vert 7 0.4453125 0.416015625 9 1
> 	vert 8 0.453125 0.517578125 10 1
> 	vert 9 0.39453125 0.513671875 11 1
>          . . .
> C code:
>          . . .
>     if (sscanf (buff, "%s %d ( %f %f %f ) ( %f %f %f )",
>       joint->name,&joint->parent,&joint->pos(0),
>       &joint->pos(1),&joint->pos(2),&joint->orient(0),
>       &joint->orient(1),&joint->orient(2)) == 8){
>          . . .