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20 changes: 11 additions & 9 deletions docs/examples/c-from-js.md
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,7 @@ calculates a sum of two numbers gets exported to JavaScript. The C application
calls `sum()` that invokes the C function `sum()`.

```c

#include <stdio.h>
#include <string.h>
#include "v7.h"
Expand All @@ -24,21 +25,22 @@ static double sum(double a, double b) {
* a C function that glues C function `sum()` and JavaScript function `sum()`
* together
*/
static v7_val_t js_sum(struct v7 *v7, v7_val_t this_obj, v7_val_t args) {
static enum v7_err js_sum(struct v7 *v7, v7_val_t *res) {

/*
* When JavaScript function `sum()` is called, V7 creates arguments array
* `args` and calls `js_sum()` glue function. Here we extract argument values
* from the args array.
* When JavaScript function `sum()` is called, V7 creates an arguments array
* and then calls the `js_sum()` glue function. Here we extract argument values
* from the args array via `v7_get_arguments()`.
*/
double arg0 = v7_get_double(v7_array_get(v7, args, 0));
double arg1 = v7_get_double(v7_array_get(v7, args, 1));
v7_val_t args = v7_get_arguments(v7);
double arg0 = v7_get_double(v7, v7_array_get(v7, args, 0));
double arg1 = v7_get_double(v7, v7_array_get(v7, args, 1));

/* Call C function `sum()` */
double result = sum(arg0, arg1);
*res = v7_mk_number(v7, sum(arg0, arg1));

/* Return result to JavaScript */
return v7_mk_number(result);
/* Return without errors */
return V7_OK;
}

int main(void) {
Expand Down