Hello. I'm thinking that the 0x was stripped for purely cosmetic reasons
rather than anything functional. I had originally thought that the readln
function might need the formatting, but taking a closer look at it now I
don't see any need.
Nick
On Tuesday 25 January 2005 1:20 am, Marcelo Tosatti wrote:
> Hi Nick,
>
> Curiosity: What was the reason for stripping the leading 0x?
>
> On Mon, Jan 24, 2005 at 02:41:56PM -0800, Nick Pollitt wrote:
> > Sorry about previous message.
> >
> > The hex function in scripts/Configure strips the leading 0x from hex
> > values. The 0x needs to be there in autoconf.h, and stripping it out
> > causes the following problematic scenario:
> >
> > If I start with a hex value in my config file like this:
> > CONFIG_LOWMEM_SIZE=0x40000000
> > and then run make oldconfig, it strips out the '0x' so I end up with
> > this: CONFIG_LOWMEM_SIZE=40000000
> > Then if I run make xconfig, it doesn't think this is a valid hex value,
> > so it replaces my value with the default:
> > CONFIG_LOWMEM_SIZE=0x20000000
> >
> > The following patch removes the lines that strip out 0x, and inserts the
> > 0x if appropriate.
> >
> > --- scripts/Configure.orig 2005-01-24 13:31:55.000000000 -0800
> > +++ scripts/Configure 2005-01-24 13:34:20.000000000 -0800
> > @@ -378,15 +378,18 @@
> > function hex () {
> > old=$(eval echo "\${$2}")
> > def=${old:-$3}
> > - def=${def#*[x,X]}
> > while :; do
> > readln "$1 ($2) [$def] " "$def" "$old"
> > - ans=${ans#*[x,X]}
> > - if expr "$ans" : '[0-9a-fA-F][0-9a-fA-F]*$' > /dev/null; then
> > - define_hex "$2" "0x$ans"
> > + if expr "$ans" : '0x[0-9a-fA-F][0-9a-fA-F]*$' > /dev/null; then
> > + define_hex "$2" "$ans"
> > break
> > else
> > - help "$2"
> > + if expr "$ans" : '[0-9a-fA-F][0-9a-fA-F]*$' > /dev/null; then
> > + define_hex "$2" "0x$ans"
> > + break
> > + else
> > + help "$2"
> > + fi
> > fi
> > done
> > }
-
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