My situation involves a structure that holds several other structures inside it. Here's a small illustration:
typedef struct payload {
int offset;
} payload_t;
typedef struct record {
payload_t payloads[12];
int status;
} record_tCan I print the sizes of every structure belonging to record_t?
You'd first have to know the relevant types. Unlike java or c#, for instance, C offers no reflection.
Once you know those types, you just need sizeof together with a function that prints the result.
The C language by itself can't do this, because it lacks that kind of introspection. Your only option is to visit each structure member and output its size.
However, eight years back I faced exactly this task with a big, complicated struct containing four hundred members. Eventually I extracted what I needed by parsing the object file's debugging information. I've forgotten the specifics, but you'll have to compile using the -g option, then use a suitable tool to dump the debug information. The readelf and objdump tools and their manuals would be worth checking.
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