env: Add a command to display details about env flags

Similar to the env callback command, this will show details about the
options available, the static list, and the currently active variables.

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

README

@@ -816,6 +816,7 @@ The following options need to be configured:
 		CONFIG_CMD_EEPROM	* EEPROM read/write support
 		CONFIG_CMD_ELF		* bootelf, bootvx
 		CONFIG_CMD_ENV_CALLBACK	* display details about env callbacks
+		CONFIG_CMD_ENV_FLAGS	* display details about env flags
 		CONFIG_CMD_EXPORTENV	* export the environment
 		CONFIG_CMD_EXT2		* ext2 command support
 		CONFIG_CMD_EXT4		* ext4 command support

common/cmd_nvedit.c

@@ -443,6 +443,59 @@ int do_env_callback(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 }
 #endif
 
+#if defined(CONFIG_CMD_ENV_FLAGS)
+static int print_static_flags(const char *var_name, const char *flags)
+{
+	enum env_flags_vartype type = env_flags_parse_vartype(flags);
+
+	printf("\t%-20s %-20s\n", var_name, env_flags_get_vartype_name(type));
+
+	return 0;
+}
+
+static int print_active_flags(ENTRY *entry)
+{
+	enum env_flags_vartype type;
+
+	if (entry->flags == 0)
+		return 0;
+
+	type = (enum env_flags_vartype)
+		(entry->flags & ENV_FLAGS_VARTYPE_BIN_MASK);
+	printf("\t%-20s %-20s\n", entry->key, env_flags_get_vartype_name(type));
+
+	return 0;
+}
+
+/*
+ * Print the flags available and what variables have flags
+ */
+int do_env_flags(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	/* Print the available variable types */
+	printf("Available variable type flags (position %d):\n",
+		ENV_FLAGS_VARTYPE_LOC);
+	puts("\tFlag\tVariable Type Name\n");
+	puts("\t----\t------------------\n");
+	env_flags_print_vartypes();
+	puts("\n");
+
+	/* Print the static flags that may exist */
+	puts("Static flags:\n");
+	printf("\t%-20s %-20s\n", "Variable Name", "Variable Type");
+	printf("\t%-20s %-20s\n", "-------------", "-------------");
+	env_attr_walk(ENV_FLAGS_LIST_STATIC, print_static_flags);
+	puts("\n");
+
+	/* walk through each variable and print the flags if non-default */
+	puts("Active flags:\n");
+	printf("\t%-20s %-20s\n", "Variable Name", "Variable Type");
+	printf("\t%-20s %-20s\n", "-------------", "-------------");
+	hwalk_r(&env_htab, print_active_flags);
+	return 0;
+}
+#endif
+
 /*
  * Interactively edit an environment variable
  */
@@ -913,6 +966,9 @@ static cmd_tbl_t cmd_env_sub[] = {
 #if defined(CONFIG_CMD_ENV_CALLBACK)
 	U_BOOT_CMD_MKENT(callbacks, 1, 0, do_env_callback, "", ""),
 #endif
+#if defined(CONFIG_CMD_ENV_FLAGS)
+	U_BOOT_CMD_MKENT(flags, 1, 0, do_env_flags, "", ""),
+#endif
 #if defined(CONFIG_CMD_EXPORTENV)
 	U_BOOT_CMD_MKENT(export, 4, 0, do_env_export, "", ""),
 #endif
@@ -974,6 +1030,9 @@ static char env_help_text[] =
 #if defined(CONFIG_CMD_EXPORTENV)
 	"env export [-t | -b | -c] [-s size] addr [var ...] - export environment\n"
 #endif
+#if defined(CONFIG_CMD_ENV_FLAGS)
+	"env flags - print variables that have non-default flags\n"
+#endif
 #if defined(CONFIG_CMD_GREPENV)
 	"env grep string [...] - search environment\n"
 #endif

common/env_flags.c

@@ -43,6 +43,40 @@
 #endif
 
 static const char env_flags_vartype_rep[] = "sdxb" ENV_FLAGS_NET_VARTYPE_REPS;
+#ifdef CONFIG_CMD_ENV_FLAGS
+static const char * const env_flags_vartype_names[] = {
+	"string",
+	"decimal",
+	"hexadecimal",
+	"boolean",
+#ifdef CONFIG_CMD_NET
+	"IP address",
+	"MAC address",
+#endif
+};
+
+/*
+ * Print the whole list of available type flags.
+ */
+void env_flags_print_vartypes(void)
+{
+	enum env_flags_vartype curtype = (enum env_flags_vartype)0;
+
+	while (curtype != env_flags_vartype_end) {
+		printf("\t%c   -\t%s\n", env_flags_vartype_rep[curtype],
+			env_flags_vartype_names[curtype]);
+		curtype++;
+	}
+}
+
+/*
+ * Return the name of the type.
+ */
+const char *env_flags_get_vartype_name(enum env_flags_vartype type)
+{
+	return env_flags_vartype_names[type];
+}
+#endif /* CONFIG_CMD_ENV_FLAGS */
 
 /*
  * Parse the flags string from a .flags attribute list into the vartype enum.

include/env_flags.h

@@ -47,6 +47,17 @@ enum env_flags_vartype {
 #define ENV_FLAGS_LIST_STATIC \
 	CONFIG_ENV_FLAGS_LIST_STATIC
 
+#ifdef CONFIG_CMD_ENV_FLAGS
+/*
+ * Print the whole list of available type flags.
+ */
+void env_flags_print_vartypes(void);
+/*
+ * Return the name of the type.
+ */
+const char *env_flags_get_vartype_name(enum env_flags_vartype type);
+#endif
+
 /*
  * Parse the flags string from a .flags attribute list into the vartype enum.
  */