dhh1128

// Define two overrides that can be used by the expansion of 
// our main macro.
#define _MY_CONCAT3(a, b, c) a b c
#define _MY_CONCAT2(a, b) a b

// Define a macro that uses the "paired, sliding arg list"
// technique to select the appropriate override. You should
// recognize this as similar to the GET_NTH_ARG() macro in
// previous examples.
#define _GET_OVERRIDE(_1, _2, _3, NAME, ...) NAME

dhh1128

// Accept any number of args >= N, but expand to just the Nth one.
// Here, N == 6.
#define _GET_NTH_ARG(_1, _2, _3, _4, _5, N, ...) N

// Define some macros to help us create overrides based on the
// arity of a for-each-style macro.
#define _fe_0(_call, ...)
#define _fe_1(_call, x) _call(x)
#define _fe_2(_call, x, ...) _call(x) _fe_1(_call, __VA_ARGS__)
#define _fe_3(_call, x, ...) _call(x) _fe_2(_call, __VA_ARGS__)

dhh1128

#define eprintf(fmt, ...) \
    fprintf(stderr, fmt, ##__VA_ARGS__)

dhh1128

Keybase proof

I hereby claim:

• I am dhh1128 on github.
• I am danielhardman (https://keybase.io/danielhardman) on keybase.
• I have a public key ASC5mGC4Dkg3IL-cTVqannhJNbbJnaWCAEu4CZfnXcgiVAo

To claim this, I am signing this object:

dhh1128

{
  "header": {
    "alg": "EdDSA",
    "typ": "passport",
    "ppt": "vvp",
    // OOBI of AID for (signing software invoked by SBC of) OP
    "kid": "https://wit1.provenant.net:5631/oobi/E0F9C28367E4011E7BA587831C1B8DEBA/witness",
  }
  "payload": {
    // originating TN in E164 format; see https://www.rfc-editor.org/rfc/rfc8225#section-5.2.1