[PATCH v12 15/24] cli: add modern hush as parser for run_command*()

[Francis Laniel]

Enables using, in code, modern hush as parser for run_command function family.
It also enables the command run to be used by CLI user of modern hush.

Reviewed-by: Simon Glass <sjg at chromium.org>
Signed-off-by: Francis Laniel <francis.laniel at amarulasolutions.com>
---
 common/cli.c               | 67 ++++++++++++++++++++++++++++----------
 common/cli_hush_upstream.c |  2 +-
 2 files changed, 51 insertions(+), 18 deletions(-)

diff --git a/common/cli.c b/common/cli.c
index b3eb512b62..a34938294e 100644
--- a/common/cli.c
+++ b/common/cli.c
@@ -25,6 +25,14 @@
 #include <linux/errno.h>
 
 #ifdef CONFIG_CMDLINE
+
+static inline bool use_hush_old(void)
+{
+	return IS_ENABLED(CONFIG_HUSH_SELECTABLE) ?
+	gd->flags & GD_FLG_HUSH_OLD_PARSER :
+	IS_ENABLED(CONFIG_HUSH_OLD_PARSER);
+}
+
 /*
  * Run a command using the selected parser.
  *
@@ -43,15 +51,30 @@ int run_command(const char *cmd, int flag)
 		return 1;
 
 	return 0;
-#elif CONFIG_IS_ENABLED(HUSH_OLD_PARSER)
-	int hush_flags = FLAG_PARSE_SEMICOLON | FLAG_EXIT_FROM_LOOP;
-
-	if (flag & CMD_FLAG_ENV)
-		hush_flags |= FLAG_CONT_ON_NEWLINE;
-	return parse_string_outer(cmd, hush_flags);
-#else /* HUSH_MODERN_PARSER */
-	/* Not yet implemented. */
-	return 1;
+#else
+	if (use_hush_old()) {
+		int hush_flags = FLAG_PARSE_SEMICOLON | FLAG_EXIT_FROM_LOOP;
+
+		if (flag & CMD_FLAG_ENV)
+			hush_flags |= FLAG_CONT_ON_NEWLINE;
+		return parse_string_outer(cmd, hush_flags);
+	}
+	/*
+	 * Possible values for flags are the following:
+	 * FLAG_EXIT_FROM_LOOP: This flags ensures we exit from loop in
+	 * parse_and_run_stream() after first iteration while normal
+	 * behavior, * i.e. when called from cli_loop(), is to loop
+	 * infinitely.
+	 * FLAG_PARSE_SEMICOLON: modern Hush parses ';' and does not stop
+	 * first time it sees one. So, I think we do not need this flag.
+	 * FLAG_REPARSING: For the moment, I do not understand the goal
+	 * of this flag.
+	 * FLAG_CONT_ON_NEWLINE: This flag seems to be used to continue
+	 * parsing even when reading '\n' when coming from
+	 * run_command(). In this case, modern Hush reads until it finds
+	 * '\0'. So, I think we do not need this flag.
+	 */
+	return parse_string_outer_modern(cmd, FLAG_EXIT_FROM_LOOP);
 #endif
 }
 
@@ -67,12 +90,23 @@ int run_command_repeatable(const char *cmd, int flag)
 #ifndef CONFIG_HUSH_PARSER
 	return cli_simple_run_command(cmd, flag);
 #else
+	int ret;
+
+	if (use_hush_old()) {
+		ret = parse_string_outer(cmd,
+					 FLAG_PARSE_SEMICOLON
+					 | FLAG_EXIT_FROM_LOOP);
+	} else {
+		ret = parse_string_outer_modern(cmd,
+					      FLAG_PARSE_SEMICOLON
+					      | FLAG_EXIT_FROM_LOOP);
+	}
+
 	/*
 	 * parse_string_outer() returns 1 for failure, so clean up
 	 * its result.
 	 */
-	if (parse_string_outer(cmd,
-			       FLAG_PARSE_SEMICOLON | FLAG_EXIT_FROM_LOOP))
+	if (ret)
 		return -1;
 
 	return 0;
@@ -111,12 +145,11 @@ int run_command_list(const char *cmd, int len, int flag)
 		buff[len] = '\0';
 	}
 #ifdef CONFIG_HUSH_PARSER
-#if CONFIG_IS_ENABLED(HUSH_OLD_PARSER)
-	rcode = parse_string_outer(buff, FLAG_PARSE_SEMICOLON);
-#else /* HUSH_MODERN_PARSER */
-	/* Not yet implemented. */
-	rcode = 1;
-#endif
+	if (use_hush_old()) {
+		rcode = parse_string_outer(buff, FLAG_PARSE_SEMICOLON);
+	} else {
+		rcode = parse_string_outer_modern(buff, FLAG_PARSE_SEMICOLON);
+	}
 #else
 	/*
 	 * This function will overwrite any \n it sees with a \0, which
diff --git a/common/cli_hush_upstream.c b/common/cli_hush_upstream.c
index 7f6b058e6c..11870c51e8 100644
--- a/common/cli_hush_upstream.c
+++ b/common/cli_hush_upstream.c
@@ -8022,7 +8022,7 @@ static int parse_and_run_string(const char *s)
 }
 
 #ifdef __U_BOOT__
-int parse_string_outer(const char *cmd, int flags)
+int parse_string_outer_modern(const char *cmd, int flags)
 {
 	int ret;
 	int old_flags;
-- 
2.34.1