mkmik

test

mkmik

/* 
 * This is dummy port of the Go option pattern to C.
 *
 * The option pattern is described somewhat obscurely in
 * http://commandcenter.blogspot.nl/2014/01/self-referential-functions-and-design.html
 *
 * In Go it already suffers from some boilerplate explosion, but it's somewhat manageable.
 * Here it's even worse, so I'm afraid this is just to be used for educational purposes.
 * 
 * To be fair, it should be possible to throw even some more preprocessor magic to 

mkmik

/* 
 * This is dummy port of the Go option pattern to C.
 *
 * The option pattern is described somewhat obscurely in
 * http://commandcenter.blogspot.nl/2014/01/self-referential-functions-and-design.html
 *
 * TL;DR: provide a way for functions to accept optional arguments with the following properties:
 *
 * 1) backward compatible signature for functions that were born with no thought for options
 * 2) allow defaults that are not the zero value of the option struct member value.

mkmik

/* 
 * This a is dummy port of the Go option pattern to C.
 *
 * The option pattern is described somewhat obscurely in
 * http://commandcenter.blogspot.nl/2014/01/self-referential-functions-and-design.html
 *
 * TL;DR: provide a way for functions to accept optional arguments with the following properties:
 *
 * 1) backward compatible signature for functions that were born with no thought for options
 * 2) allow defaults that are not the zero value of the option struct member value.

mkmik

/*
 * Dummy port of the Amiga tag based extensible api. See:
 * 
 * http://amigadev.elowar.com/read/ADCD_2.1/Includes_and_Autodocs_3._guide/node03D6.html
 *
 *
 * note that the amiga api relied on the fact that the calling convention was
 * very simple so the vararg stub could just take the pointer to the last argument,
 * and get an array of TagItem records.
 *

mkmik

/*
 * Dummy port of the Amiga tag based extensible api. See:
 * 
 * http://amigadev.elowar.com/read/ADCD_2.1/Includes_and_Autodocs_3._guide/node03D6.html
 *
 *
 * note that the amiga api relied on the fact that the calling convention was
 * very simple so the vararg stub could just take the pointer to the last argument,
 * and get an array of TagItem records.
 *

mkmik

/* 
 * Quicky and dirty optional arguments. Requires (ANSI) C99.
 *
 * Good:
 * 1. Allows to convert any existing function to a optarg function.
 * 2. Typed parameters.
 *
 * So so:
 * 3. Simple defaults are possible but might result in compiler
 *     warnings that can be suppressed but ...

mkmik

/* 
 * Quicky and dirty optional arguments. Requires (ANSI) C99.
 *
 * Good:
 * 1. Allows to convert any existing function to a optarg function.
 * 2. Typed parameters.
 * 3. Users can just use a real option struct.
 *
 * So so:
 * 4. Simple defaults are possible but might result in compiler

mkmik

ns_send("foo", "bar");
ns_send("foo", "bar", opts);

mkmik

/*
 * Quick and dirty optional option struct via function overload via preprocessor trick.
 *
 * requires C99 and gnu extension, for ", ## __VA_ARGS"
 */

#include <stdio.h>

///////// Magic library