Added AFB Helper Guide in Developer Guides

Revised and added AFB Helper Guide as a part of Developer Guides.

Bug-AGL: [SPEC-3633]

Signed-off-by: Shankho Boron Ghosh <shankhoghosh123@gmail.com>
Change-Id: I3df9265ae0570e987d80bc4bd2d3d14e7743b26a
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/documentation/+/25665
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>
Tested-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>

1 files changed, 82 insertions, 0 deletions

diff --git a/docs/3_Developer_Guides/4_AFB_Helper_Guide/5_Filescan_Utils.md b/docs/3_Developer_Guides/4_AFB_Helper_Guide/5_Filescan_Utils.md
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index 0000000..5b220e1
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+---
+title: Filescan Utils functions
+---
+
+## const char *GetMiddleName(const char *name)
+
+Get rid of the binder name prefix 'afbd-'
+
+* name will be typically the full binder name
+
+Returns the process middle name of the running binder.
+
+## const char *GetBinderName()
+
+Get the Binder Name without the prefix set by the AGL appfw 'afbd-'
+
+Returns the Binder name without the prefix.
+
+## json_object* ScanForConfig (const char* searchPath, CtlScanDirModeT mode, const char *prefix, const char *extension)
+
+Scan a directory searching all files matching pattern: 'prefix*extention'.
+
+* `searchPath`: directory where to begin the searching.
+* `mode`: either or not the search will be recursive.
+* `prefix`: file prefix that will be looking for.
+* `extention`: file extention that will be looking for.
+
+Returns a json_object array of object with 2 parts a 'fullpath' describing the
+fullpath to reach the file and 'filename' containing the matched files.
+
+## char *GetAFBRootDirPathUsingFd(int fd)
+
+Get the binder root directory path (the path specified with '--rootdir' option
+at binder launch, if the option is not used, the path from where the binder
+is launched) using binder root directory file descriptor.
+
+* `fd` : Binder root directory file descriptor.
+
+Returns a string representing the path to binder root directory.
+
+## char *GetAFBRootDirPath(afb_api_t apiHandle)
+
+For binding with a version >= 3, same as 'GetAFBRootDirPathUsingFd' function,
+but use pointer to the AFB API as parameter instead of
+binder root directory file descriptor.
+
+* `apiHandle` : pointer to the AFB API.
+
+Returns a string representing the path to binder root directory.
+
+## char* GetBindingDirPath()
+
+For binding with a version <= 2, same as 'GetAFBRootDirPath' function,
+but the pointer to the AFB API is not needed.
+Kept for compatibility issues.
+
+## char* GetBindingDirPath(afb_api_t api)
+
+For binding with a version >= 3, same as 'GetAFBRootDirPath' function.
+Deprecated, please use 'GetAFBRootDirPath' function.
+Kept for compatibility issues.
+
+## char *GetRunningBindingDirPath(afb_api_t api)
+
+For binding with a version >= 3, get the binding directory path
+(the path to the directory that contains the binding).
+
+* `api` : pointer to the AFB API.
+
+Returns a string representing the path to the binding directory.
+
+## const char *getEnvDirList(const char *prefix, const char *suffix)
+
+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).
+
+* `prefix`: Environment variable prefix
+* `suffix`: Environment variable suffix
+
+Returns a string representing a colon separated path list or NULL is case of
+error or none environment variables found.
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