How to go from a JS string[] to a C array of pointers

Hi,
Trying to call a C function with FFI but struggling to covert a string[] to an array of pointers. Lets asume the following C function

void test_multi(int argc, const char * const *argv) {
  for (int i = 0; i < argc; i++) {
    puts(argv[i]);
  }
}

void test_multi(int argc, const char * const *argv) {
  for (int i = 0; i < argc; i++) {
    puts(argv[i]);
  }
}

And using some JS code I can try to call it

const enc = new TextEncoder()
const test = Deno.dlopen('./test.so'), {
   test_multi: {
      parameters: ['i32', 'buffer'],
      result: 'void'
   }
})

const params = [ 'ASD', 'ZXC' ]
test.symbols.test_multi(params.length, ??????)

const enc = new TextEncoder()
const test = Deno.dlopen('./test.so'), {
   test_multi: {
      parameters: ['i32', 'buffer'],
      result: 'void'
   }
})

const params = [ 'ASD', 'ZXC' ]
test.symbols.test_multi(params.length, ??????)

buffer

buffer

the right type for that parameter I better us

pointer

pointer

?. And finally how to convert the

params

params

array to something that can be sent to the C function.

Appreciate the help.

Deno•2y ago•

20 replies

carragom

How to go from a JS string[] to a C array of pointers

Hi,
Trying to call a C function with FFI but struggling to covert a string[] to an array of pointers. Lets asume the following C function

void test_multi(int argc, const char * const *argv) {
  for (int i = 0; i < argc; i++) {
    puts(argv[i]);
  }
}

void test_multi(int argc, const char * const *argv) {
  for (int i = 0; i < argc; i++) {
    puts(argv[i]);
  }
}

And using some JS code I can try to call it

const enc = new TextEncoder()
const test = Deno.dlopen('./test.so'), {
   test_multi: {
      parameters: ['i32', 'buffer'],
      result: 'void'
   }
})

const params = [ 'ASD', 'ZXC' ]
test.symbols.test_multi(params.length, ??????)

const enc = new TextEncoder()
const test = Deno.dlopen('./test.so'), {
   test_multi: {
      parameters: ['i32', 'buffer'],
      result: 'void'
   }
})

const params = [ 'ASD', 'ZXC' ]
test.symbols.test_multi(params.length, ??????)

buffer

buffer

the right type for that parameter I better us

pointer

pointer

?. And finally how to convert the

params

params

array to something that can be sent to the C function.

Appreciate the help.

How to go from a JS string[] to a C array of pointers

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