Retrieve directory list from environment variables

This adds a function able to retrieve from a prefix and suffix
an environment variable. This is meant to search config or plugin
files from potentially several sources, environment and source code.

This tries to get 2 environments variables:

- prefix+binderName+suffix (eg: AFT_LOWCAN_CONFIG_PATH)
- prefix+suffix (eg: AFT_CONFIG_PATH)

Then it returns the one found or both if they exist with the
most accurate one (with the binder name) first followed by the
other.

Change-Id: Ic448ff017e6158bec05895d63688b8968b5c6434
Signed-off-by: Romain Forlot <romain.forlot@iot.bzh>

1 files changed, 18 insertions, 4 deletions

diff --git a/filescan-utils.h b/filescan-utils.h
index 317ee7e..bf8fb53 100644
--- a/filescan-utils.h
+++ b/filescan-utils.h
@@ -55,14 +55,14 @@ typedef enum {
  *
  * @return const char*
  */
-const char *GetMiddleName(const char *name);
+extern const char *GetMiddleName(const char *name);
 
 /**
  * @brief Get the Binder Name without the prefix set by the AGL appfw 'afbd-'
  *
  * @return const char* the Binder name without the prefix.
  */
-const char *GetBinderName();
+extern const char *GetBinderName();
 
 /**
  * @brief Scan a directory searching all files matching pattern:
@@ -77,7 +77,7 @@ const char *GetBinderName();
  * describing the fullpath to reach the file and 'filename' containing the
  * matched files.
  */
-json_object* ScanForConfig (const char* searchPath, CtlScanDirModeT mode, const char *prefix, const char *extension);
+extern json_object* ScanForConfig (const char* searchPath, CtlScanDirModeT mode, const char *prefix, const char *extension);
 
 /**
  * @brief Get the Binding root directory file descriptor object
@@ -86,7 +86,21 @@ json_object* ScanForConfig (const char* searchPath, CtlScanDirModeT mode, const
  *
  * @return char* string representing the path to binding root directory.
  */
-char *GetBindingDirPath(struct afb_dynapi *dynapi);
+extern char *GetBindingDirPath(struct afb_dynapi *dynapi);
+
+/**
+ * @brief Get the environment directory colon separated path list. This take the
+ * prefix add the binder's name then the suffix as environment variable name and
+ * also search for another variable without the binder's name (so only
+ * prefix+suffix).
+ *
+ * @param prefix Environment variable prefix
+ * @param suffix Environment variable suffix
+ *
+ * @return const char* a string representing a colon separated path list or NULL
+ * is case of error or none environment variables found.
+ */
+extern const char *getEnvDirList(const char *prefix, const char *suffix);
 
 #ifdef __cplusplus
     }