env: Allow env_attr_walk to pass a priv * to callback

In some cases it can be helpful to have context in the callback about
the calling situation. This is needed for following patches.

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

common/cmd_nvedit.c

@@ -427,7 +427,8 @@ int do_env_ask(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 #endif
 
 #if defined(CONFIG_CMD_ENV_CALLBACK)
-static int print_static_binding(const char *var_name, const char *callback_name)
+static int print_static_binding(const char *var_name, const char *callback_name,
+				void *priv)
 {
 	printf("\t%-20s %-20s\n", var_name, callback_name);
 
@@ -489,7 +490,7 @@ int do_env_callback(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 	puts("Static callback bindings:\n");
 	printf("\t%-20s %-20s\n", "Variable Name", "Callback Name");
 	printf("\t%-20s %-20s\n", "-------------", "-------------");
-	env_attr_walk(ENV_CALLBACK_LIST_STATIC, print_static_binding);
+	env_attr_walk(ENV_CALLBACK_LIST_STATIC, print_static_binding, NULL);
 	puts("\n");
 
 	/* walk through each variable and print the callback if it has one */
@@ -502,7 +503,8 @@ 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)
+static int print_static_flags(const char *var_name, const char *flags,
+			      void *priv)
 {
 	enum env_flags_vartype type = env_flags_parse_vartype(flags);
 	enum env_flags_varaccess access = env_flags_parse_varaccess(flags);
@@ -559,7 +561,7 @@ int do_env_flags(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 		"Variable Access");
 	printf("\t%-20s %-20s %-20s\n", "-------------", "-------------",
 		"---------------");
-	env_attr_walk(ENV_FLAGS_LIST_STATIC, print_static_flags);
+	env_attr_walk(ENV_FLAGS_LIST_STATIC, print_static_flags, NULL);
 	puts("\n");
 
 	/* walk through each variable and print the flags if non-default */

common/env_attr.c

@@ -26,7 +26,8 @@
  *	list = entry[,list]
  */
 int env_attr_walk(const char *attr_list,
-	int (*callback)(const char *name, const char *attributes))
+	int (*callback)(const char *name, const char *attributes, void *priv),
+	void *priv)
 {
 	const char *entry, *entry_end;
 	char *name, *attributes;
@@ -93,7 +94,7 @@ int env_attr_walk(const char *attr_list,
 			if (strlen(name) != 0) {
 				int retval = 0;
 
-				retval = callback(name, attributes);
+				retval = callback(name, attributes, priv);
 				if (retval) {
 					free(entry_cpy);
 					return retval;

common/env_callback.c

@@ -90,7 +90,7 @@ static int clear_callback(ENTRY *entry)
 /*
  * Call for each element in the list that associates variables to callbacks
  */
-static int set_callback(const char *name, const char *value)
+static int set_callback(const char *name, const char *value, void *priv)
 {
 	ENTRY e, *ep;
 	struct env_clbk_tbl *clbkp;
@@ -126,9 +126,9 @@ static int on_callbacks(const char *name, const char *value, enum env_op op,
 	hwalk_r(&env_htab, clear_callback);
 
 	/* configure any static callback bindings */
-	env_attr_walk(ENV_CALLBACK_LIST_STATIC, set_callback);
+	env_attr_walk(ENV_CALLBACK_LIST_STATIC, set_callback, NULL);
 	/* configure any dynamic callback bindings */
-	env_attr_walk(value, set_callback);
+	env_attr_walk(value, set_callback, NULL);
 
 	return 0;
 }

common/env_flags.c

@@ -435,7 +435,7 @@ static int clear_flags(ENTRY *entry)
 /*
  * Call for each element in the list that defines flags for a variable
  */
-static int set_flags(const char *name, const char *value)
+static int set_flags(const char *name, const char *value, void *priv)
 {
 	ENTRY e, *ep;
 
@@ -463,9 +463,9 @@ static int on_flags(const char *name, const char *value, enum env_op op,
 	hwalk_r(&env_htab, clear_flags);
 
 	/* configure any static flags */
-	env_attr_walk(ENV_FLAGS_LIST_STATIC, set_flags);
+	env_attr_walk(ENV_FLAGS_LIST_STATIC, set_flags, NULL);
 	/* configure any dynamic flags */
-	env_attr_walk(value, set_flags);
+	env_attr_walk(value, set_flags, NULL);
 
 	return 0;
 }

include/env_attr.h

@@ -16,13 +16,14 @@
  *	attributes = [^,:\s]*
  *	entry = name[:attributes]
  *	list = entry[,list]
- * It will call the "callback" function with the "name" and attribute as "value"
+ * It will call the "callback" function with the "name" and "attributes"
  * The callback may return a non-0 to abort the list walk.
  * This return value will be passed through to the caller.
  * 0 is returned on success.
  */
-extern int env_attr_walk(const char *attr_list,
-	int (*callback)(const char *name, const char *value));
+int env_attr_walk(const char *attr_list,
+	int (*callback)(const char *name, const char *attributes, void *priv),
+	void *priv);
 
 /*
  * env_attr_lookup takes as input an "attr_list" with the same form as above.
@@ -33,7 +34,6 @@ extern int env_attr_walk(const char *attr_list,
  * "attr_list" is NULL.
  * Returns 0 on success.
  */
-extern int env_attr_lookup(const char *attr_list, const char *name,
-	char *attributes);
+int env_attr_lookup(const char *attr_list, const char *name, char *attributes);
 
 #endif /* __ENV_ATTR_H__ */