default environment: make string arguments const

Change default_environment_path_set() to take a const char * and let
default_environment_path_get() return a const char *.
Also, do not keep a copy of the string passed to
default_environment_path_set() rather than the original string to make
it more clear where the path is allocated. This allows us to free the
string passed to default_environment_path_set() after usage by some
callers.

Link: https://lore.barebox.org/20240219105507.1618465-1-s.hauer@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 4 insertions, 4 deletions

diff --git a/include/envfs.h b/include/envfs.h
index abe0ffb963..767b34c943 100644
--- a/include/envfs.h
+++ b/include/envfs.h
@@ -105,14 +105,14 @@ int envfs_load_from_buf(void *buf, int len, const char *dir, unsigned flags);
 
 /* defaults to /dev/env0 */
 #ifdef CONFIG_ENV_HANDLING
-void default_environment_path_set(char *path);
-char *default_environment_path_get(void);
+void default_environment_path_set(const char *path);
+const char *default_environment_path_get(void);
 #else
-static inline void default_environment_path_set(char *path)
+static inline void default_environment_path_set(const char *path)
 {
 }
 
-static inline char *default_environment_path_get(void)
+static inline const char *default_environment_path_get(void)
 {
 	return NULL;
 }