tree 256be8ba66e737f82f2ac31b1ce0795ea8388bf8
parent 923c46f97a7936cbdc6e113d7705cf46a73dc85c
author Joe Hershberger <joe.hershberger@ni.com> 1345199189 +0000
committer Wolfgang Denk <wd@denx.de> 1346610624 +0200

hush: Add default value substitution support

Use standard sh syntax:
${VAR:-default}
	Use default value: if VAR is set and non-null, expands to $VAR.
	Otherwise, expands to default.
${VAR:=default}
	Set default value: if VAR is set and non-null, expands to $VAR.
	Otherwise, sets hush VAR to default and expands to default.
${VAR:+default}
	If VAR is set and non-null, expands to the empty string.
	Otherwise, expands to default.

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>