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trixy/example/main/c/main.c

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/*
* Copyright (C) 2023 - 2024:
* The Trinitrix Project <soispha@vhack.eu, antifallobst@systemausfall.org>
* SPDX-License-Identifier: LGPL-3.0-or-later
*
* This file is part of the Trixy crate for Trinitrix.
*
* Trixy is free software: you can redistribute it and/or modify
* it under the terms of the Lesser GNU General Public License as
* published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* and the Lesser GNU General Public License along with this program.
* If not, see <https://www.gnu.org/licenses/>.
*/
#include "../dist/interface.h"
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define println(args...) \
printf ("\33[32;1m(plugin):\33[0m \33[34;1m"); \
printf (args); \
printf ("\n\33[0m"); \
fflush (stdout);
#define eprintln(args...) \
printf ("\33[32;1m(plugin):\33[0m\33[31;1m "); \
printf (args); \
printf ("\n\33[0m"); \
fflush (stdout);
void
handle_error ()
{
int error_length = last_error_length ();
char *error = malloc (error_length);
last_error_message (error, error_length);
eprintln ("Encountered error: %s", error);
free (error);
}
struct Dog
guess (const char *pers_name, uint32_t age)
{
println ("Rust wants to name the dog %s, but that's not good!", pers_name);
// The callback must free all its owned arguments, as rust just moved these
// here and is not going to free them.
string_free (pers_name);
struct Dog dog = {
.name = "James",
};
return dog;
}
int
plugin_main ()
{
// You can simply call functions ..
outstanding ("James");
// .. but they check their inputs:
// This call for example will fail, as a null pointer isn't supported.
//
// A error will be signaled by a 0 return code, then the error can be
// obtained with the `last_error_length` and `last_error_message` functions
// (which in our case is wrapped by the `handle_error` function)
if (!outstanding (NULL))
handle_error ();
println ("Saying hi!");
const char *hi;
if (!dogs.hi (&hi, "Adam"))
handle_error ();
println ("Rust returned: %s", hi);
string_free (hi);
// The API also has full support for custom types (the `Dog` and `TrainedDog`
// types are defined in the `api.tri` file)
struct Dog dog = { .name = "Bruce" };
Result (TrainedDog, TrainingMistake) tDog;
if (!dogs.train_dog (&tDog, dog))
handle_error ();
if (tDog.tag == OK)
{
println ("Dog %s is now trained with specialization %i",
tDog.value.ok.name, tDog.value.ok.training);
// Beware that you need to free them with the appropriate free functions
string_free (tDog.value.ok.name);
}
else
{
eprintln (
"The dog could not be trained because of a training mistake: '%d'",
tDog.value.err)
}
// Trixy also supports functions (i.e. callbacks):
enum DogType output_dog;
if (!dogs.guess_my_favourite_dog (&output_dog, guess))
handle_error ();
println ("Rust guessed %d", output_dog);
return 0;
}