Trying to understand ptls_buffer_push_block and ptls_buffer_push

[gmusjha]

I am trying to learn picotls a little bit better, I this process I come across code like the following:

I have tried to use gcc -E to expand macro but still, I thought I should ask

The first-line below has a capacity of 3. What it has to be like that? why not 1 or 2 or any other number. Second ptls_buffer_pushv allocates memory. How come it is taking certificates[i].len bot certificate[i].len * sizeof(char)

your thoughts will be appreciated.

ptls_buffer_push_block(buf, 3, { size_t i; for (i = 0; i != num_certificates; ++i) { ptls_buffer_push_block(buf, 3, { ptls_buffer_pushv(buf, certificates[i].base, certificates[i].len); }); ptls_buffer_push_block(buf, 2, { if (i == 0 && ocsp_status.len != 0) { buffer_push_extension(buf, PTLS_EXTENSION_TYPE_STATUS_REQUEST, { ptls_buffer_push(buf, 1); /* status_type == ocsp */ ptls_buffer_push_block(buf, 3, { ptls_buffer_pushv(buf, ocsp_status.base, ocsp_status.len); }); }); } }); } });