hush: implement getopt builtin

Positional parameters are not nice, so implement a getopt
function. This has to be done as a builtin because otherwise
we have no access to the parents argc/argv.

getopt works as expected, here is a little example:

while getopt "hs:" OPT
do
        if [ $OPT = h ]; then
                echo "usage"
                exit 1
        else
                echo "scr: opt: $OPT optarg: $OPTARG"
	fi
done

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 7 insertions, 0 deletions

diff --git a/common/Kconfig b/common/Kconfig
index ad70cde4f3..123d07086e 100644
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -248,6 +248,13 @@ config HUSH_FANCY_PROMPT
 	  Allow to set PS1 from the command line. PS1 can have several escaped commands
 	  like \h for CONFIG_BOARDINFO or \w for the current working directory.
 
+config HUSH_GETOPT
+	bool
+	depends on SHELL_HUSH
+	prompt "enable builtin getopt"
+	help
+	  This enables a getopt function builtin to hush.
+
 config CMDLINE_EDITING
 	bool
 	prompt "Enable command line editing"