[parseopt] Allow "prompt" command to accept character literals for --key

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/core/parseopt.c

 #include <errno.h>
 #include <getopt.h>
 #include <ipxe/netdevice.h>
-#include <ipxe/image.h>
 #include <ipxe/parseopt.h>
 
 /** @file
 	return 0;
 }
 
+/**
+ * Parse key
+ *
+ * @v text		Text
+ * @ret key		Key
+ * @ret rc		Return status code
+ */
+int parse_key ( const char *text, unsigned int *key ) {
+
+	/* Interpret single characters as being a literal key character */
+	if ( text[0] && ! text[1] ) {
+		*key = text[0];
+		return 0;
+	}
+
+	/* Otherwise, interpret as an integer */
+	return parse_integer ( text, key );
+}
+
 /**
  * Print command usage message
  *

src/image/script.c

 /** "prompt" option list */
 static struct option_descriptor prompt_opts[] = {
 	OPTION_DESC ( "key", 'k', required_argument,
-		      struct prompt_options, key, parse_integer ),
+		      struct prompt_options, key, parse_key ),
 	OPTION_DESC ( "timeout", 't', required_argument,
 		      struct prompt_options, timeout, parse_integer ),
 };

src/include/ipxe/parseopt.h

 extern int parse_integer ( const char *text, unsigned int *value );
 extern int parse_netdev ( const char *text, struct net_device **netdev );
 extern int parse_flag ( const char *text __unused, int *flag );
+extern int parse_key ( const char *text, unsigned int *key );
 extern void print_usage ( struct command_descriptor *cmd, char **argv );
 extern int reparse_options ( int argc, char **argv,
 			     struct command_descriptor *cmd, void *opts );