#!/bin/sh

log()
{
  echo "$@" >&2
}

usage()
{
  log "Usage: $0 <name-of-mtd>"
  log "  Prints the (last) /dev/mtd* device that matches the given name,"
  log "  or returns nonzero if none is available."
  exit 9
}

if [ "$#" != 1 ]; then
  usage
fi

result=

while IFS=" :" read dev size erasesize name; do
  name=${name#\"}
  name=${name%\"}
  if [ "$name" = "$1" ]; then
    result=${dev#mtd}
    # fall through in case there's a subsequent device with same name
  fi
done </proc/mtd

if [ -n "$result" ]; then
  echo "/dev/mtd$result"
  exit 0
else
  exit 1
fi