python3, ctypes, arrays

/*
file testc.py:

#!/usr/bin/env python3

from ctypes import *

lib = cdll.LoadLibrary('./libtestas.so.1.0')

f_array_1 = (c_float * 16)(*range(16))
f_array_2 = (c_float * 16)(*range(16))

print("f_array_1:");

for i in range(0,16):
    print(f_array_1[i], ' ', end = '', flush=True)

print("\nf_array_2 (before):")

for i in range(0,16):
    f_array_2[i] = 0.0
    print(f_array_2[i], ' ', end = '', flush=True)

retval = c_bool()

lib.arrTst.restype=c_bool

retval = lib.arrTst(byref(f_array_1), byref(f_array_2), 16)

if retval:
    print("\nERROR: arrTst")
else:
    print("\nf_array_2 (after):")
    for i in range(0,16):
        print(f_array_2[i], ' ', end = '', flush=True)

print(" ")

*/

/*

build shared library:

gcc -fPIC -c testas.c
ld -shared -soname libtestas.so.1 -o libtestas.so.1.0 -lc testas.o


file testc.py, make executable:

chmod +x testc.py

run:
./testc.py

*/

//file testas.c:

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <stdint.h>

void _init()
{
    printf("init\n");
}

void _fini()
{
    printf("fini\n");
}

bool arrTst(float *inp, float *outp, uint32_t numOfE)
{

    uint32_t offset = 0;

    if(offset<numOfE)
    {
        for(; offset<numOfE; ++offset)
        {
            outp[offset] = inp[offset];
        }
    }
    else return 1;

    return 0;
}

/*
output:

init
f_array_1:
0.0  1.0  2.0  3.0  4.0  5.0  6.0  7.0  8.0  9.0  10.0  11.0  12.0  13.0  14.0  15.0
f_array_2 (before):
0.0  0.0  0.0  0.0  0.0  0.0  0.0  0.0  0.0  0.0  0.0  0.0  0.0  0.0  0.0  0.0
f_array_2 (after):
0.0  1.0  2.0  3.0  4.0  5.0  6.0  7.0  8.0  9.0  10.0  11.0  12.0  13.0  14.0  15.0
fini

*/