Re: [xml] xmlChar to int conversion

[Stefan Seefeld <seefeld sympatico ca>]

Nick Torenvliet wrote:
> I guess at the same time I should ask how to get an int back to an
> xmlChar.
>
> On Tue, 2003-03-11 at 13:59, Nick Torenvliet wrote:
>
> > Hi, I have a property of a tag and I need to convert it into an integer.
> >
> > I am really unfamiliar with UTF8 so I am not sure how to take something
> > from an xmlChar * to an integer.  How can I succesfully complete the
> > following?
> >
> > int i;
> > i = xmlGetProp(cur,"val");

what do you mean by 'convert' ? Is the character actually a number in 
the range [0,9] ? If that's what you want, you can do it like this:

int i;
xmlChar *attr = xmlGetProp(cur, "val");
if (*attr >= '0' && *attr <= '9') i = (int)*attr;

If you expect an ascii letter and want to map that to an int, you
should test whether *attr really represents an ascii char, and then
cast it. Otherwise the conversion won't work, since arbitrary utf8
characters may be larger than an int can hold.

Oh, and if the attribute contains a *string* such as "42", you really
have to parse it, one character at a time, using the above technique
(i.e. to exclude non-ascii chars).

Regards,
                Stefan