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, 39 insertions, 0 deletions

diff --git a/docs/3_Developer_Guides/4_AFB_Helper_Guide/4_URL_Escaping.md b/docs/3_Developer_Guides/4_AFB_Helper_Guide/4_URL_Escaping.md
new file mode 100644
index 0000000..4070acb
--- /dev/null
+++ b/docs/3_Developer_Guides/4_AFB_Helper_Guide/4_URL_Escaping.md
@@ -0,0 +1,39 @@
+---
+title: Escaping helpers functions
+---
+
+## char *escape_url(const char *base, const char *path, const char * const *args, size_t *length)
+
+Escape an `url` and `arguments` and returned it as a string.
+
+* `base`: representing the FQDN of the url.
+* `path`: the path to the requested page.
+* `args`: optionnal array of arguments provided for the GET request.
+* `length`: length of the returned `url`.
+
+Returns the escaped `url`.
+
+## const char *escape_args(const char * const *args, size_t *length)
+
+Escape an array of arguments and returned the lenght of the escaped arguments
+string.
+
+* `args`: array of arguments provided for the GET request.
+* `length`: length of the returned `arguments`.
+
+Returns the escaped `arguments`.
+
+## const char *escape_str(const char *str, size_t *length)
+
+Escape a string and returns it.
+
+* `str`: the string to escape.
+* `length`: length of the returned string.
+
+Returns the escaped string.
+
+## const char **unescape_args(const char *args)
+
+Unescape an argument and returns it.
+
+* `args`: the argument to unescape.