Linux ATA errors: Translating to a device name?

When a Linux box gets an ATA error, it syslogs it with a message identifying the disk as "ata%d.00". How do I translate that to a device name (e.g. /dev/sdb)? I feel like this should be trivial, but I cannot figure it out.

Peter inspired me to write an advanced script(let), which can even detect USB sticks (instead of outputting silly things like "ata0.00"). In contrary to Peter's script, you will also get the sub-number (as in 4.01) if you have more than one device at the same controller resp. channel. The output will be exactly as you get it in syslog. Tested. Working very well on my Debian box, though there is always lots of improvement (e. g. too clumsy regexps). But HOLD IT! The seemingly too high number of escaped characters you may find in my regexps is just for compatibility reasons! You can't assume GNU sed with everyone, which is why I did without extended regexps on purpose.

UPDATES
(1) Will no longer parse ls output. (oops!) Since you all know: Do not parse ls.
(2) Now also works on read-only environments.
(3) Inspired by a suggestion from this chit-chat here I have managed to again get the sed statements way less complicated.

#!/bin/bash
# note: inspired by Peter
#
# *UPDATE 1* now we're no longer parsing ls output
# *UPDATE 2* now we're using an array instead of the <<< operator, which on its
# part insists on a writable /tmp directory: 
# restricted environments with read-only access often won't allow you that

# save original IFS
OLDIFS="$IFS"

for i in /sys/block/sd*; do 
 readlink $i |
 sed 's^\.\./devices^/sys/devices^ ;
      s^/host[0-9]\{1,2\}/target^ ^ ;
      s^/[0-9]\{1,2\}\(:[0-9]\)\{3\}/block/^ ^' \
 \
  |
  while IFS=' ' read Path HostFull ID
  do

     # OLD line: left in for reasons of readability 
     # IFS=: read HostMain HostMid HostSub <<< "$HostFull"

     # NEW lines: will now also work without a hitch on r/o environments
     IFS=: h=($HostFull)
     HostMain=${h[0]}; HostMid=${h[1]}; HostSub=${h[2]}

     if echo $Path | grep -q '/usb[0-9]*/'; then
       echo "(Device $ID is not an ATA device, but a USB device [e. g. a pen drive])"
     else
       echo $ID: ata$(< "$Path/host$HostMain/scsi_host/host$HostMain/unique_id").$HostMid$HostSub
     fi

  done

done

# restore original IFS
IFS="$OLDIFS"

Look at /proc/scsi/scsi, which will look something like this:

$ cat /proc/scsi/scsi
Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
  Vendor: ATA      Model: ST3250823AS      Rev: 3.03
  Type:   Direct-Access                    ANSI SCSI revision: 05
Host: scsi1 Channel: 00 Id: 00 Lun: 00
  Vendor: ATA      Model: ST3750528AS      Rev: CC44
  Type:   Direct-Access                    ANSI SCSI revision: 05
Host: scsi2 Channel: 00 Id: 00 Lun: 00
  Vendor: ATA      Model: ST3750330AS      Rev: SD1A
  Type:   Direct-Access                    ANSI SCSI revision: 05
Host: scsi10 Channel: 00 Id: 00 Lun: 00
  Vendor: WDC WD20 Model: EARS-00MVWB0     Rev:     
  Type:   Direct-Access                    ANSI SCSI revision: 02

scsi0 id 0 is sda and ata1.00, scsi1 id 0 is sdb and ata2.00, etc.

Also look at /var/log/dmesg, which shows the ata driver loading info and will make things a little clearer. Look for the line starting "libata".