OVMS3/OVMS.V3/components/duktape/examples/hello/hello.c

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/*
* Very simple example program
*/
#include "duktape.h"
static duk_ret_t native_print(duk_context *ctx) {
duk_push_string(ctx, " ");
duk_insert(ctx, 0);
duk_join(ctx, duk_get_top(ctx) - 1);
printf("%s\n", duk_safe_to_string(ctx, -1));
return 0;
}
static duk_ret_t native_adder(duk_context *ctx) {
int i;
int n = duk_get_top(ctx); /* #args */
double res = 0.0;
for (i = 0; i < n; i++) {
res += duk_to_number(ctx, i);
}
duk_push_number(ctx, res);
return 1; /* one return value */
}
int main(int argc, char *argv[]) {
duk_context *ctx = duk_create_heap_default();
(void) argc; (void) argv; /* suppress warning */
duk_push_c_function(ctx, native_print, DUK_VARARGS);
duk_put_global_string(ctx, "print");
duk_push_c_function(ctx, native_adder, DUK_VARARGS);
duk_put_global_string(ctx, "adder");
duk_eval_string(ctx, "print('Hello world!');");
duk_eval_string(ctx, "print('2+3=' + adder(2, 3));");
duk_pop(ctx); /* pop eval result */
duk_destroy_heap(ctx);
return 0;
}