Re: Configure mangles hex values

[Nick Pollitt <npollitt@mvista.com>]

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
 }