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lib: Comment on how macro works

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Signed-off-by: Donald Lee <dlqs@gmx.com>
This commit is contained in:
Donald Lee 2021-07-23 17:03:42 +08:00
parent 59a35b667d
commit 70d995abd4
1 changed files with 14 additions and 0 deletions
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14
lib/frrscript.h
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@ -122,8 +122,22 @@ void frrscript_register_type_codecs(struct frrscript_codec *codecs);
*/ */
void frrscript_init(const char *scriptdir); void frrscript_init(const char *scriptdir);
/*
* This macro is mapped to every (name, value) in frrscript_call,
* so this in turn maps them onto their encoders
*/
#define ENCODE_ARGS(name, value) ENCODE_ARGS_WITH_STATE(lfs->L, value) #define ENCODE_ARGS(name, value) ENCODE_ARGS_WITH_STATE(lfs->L, value)
/*
* This macro is also mapped to every (name, value) in frrscript_call, but
* not every value can be mapped to its decoder - only those that appear
* in the returned table will. To find out if they appear in the returned
* table, first pop the value and check if its nil. Only call the decoder
* if non-nil.
*
* At the end, the only thing left on the stack should be the
* returned table.
*/
#define DECODE_ARGS(name, value) \ #define DECODE_ARGS(name, value) \
do { \ do { \
lua_getfield(lfs->L, 1, name); \ lua_getfield(lfs->L, 1, name); \