malloc function problem in library - (solved - my fault)

Projects Programming
1

Is there some restrictions with malloc function calling in included CPP file?
I can run the same malloc with same parameters from INO file without problems, but there is problem with library CPP file.

2

malloc does not care the path by which it is called. The answer to your question is no.

3

What are the symptoms of the "problem"? Error messages?

4

There is no memory allocated really, therefore it returns 0.

5

I'll make test package.

6

Yes, often the process of stripping your program down to an example that can be posted on the forum will show you what the mistake is.

7

Here is fast test application.
Seems that there is problem with 2D arrays.

//test_malloc.ino


#include "test.h"
testm tm;

void setup() {
  Serial.begin(57600);
  Serial.println("start");
  
  printBuf();
  tm.testarray=(char*)malloc(100);
  memset(tm.testarray, 0, 100);

  tm.testarray1 = (char**)malloc(2 * sizeof(char*));
  for (int i = 0; i < 2; i++) 
  {
    tm.testarray1[i] = (char*)malloc(16 * sizeof(char));
    memset(tm.testarray1[i], 0, 16);
  }  

  printBuf();
}

void loop() {
}

void printBuf()
{
    Serial.print("array:");
    for (int i=0; i<10; i++)
    {
      Serial.print((uint8_t)tm.testarray[i]);
      Serial.print(",");
    }
    Serial.println();

   for (int j=0; j<2; j++)
    {
      Serial.print("array1-");Serial.println(j);
      for (int i=0; i<10; i++)
      {
        Serial.print((uint8_t)tm.testarray1[j][i]);
        Serial.print(",");
      }
      Serial.println();
    }
}

//test.h

#ifndef TEST_h
#define TEST_h

#if (ARDUINO >= 100)
  #include <Arduino.h> 
#else
  #include <WProgram.h>
#endif 

class testm
{
  public:

    char* testarray;
    char** testarray1;
    testm();
    void init();
};
#endif TEST_h

//test.cpp


#include "test.h"

testm::testm()
{
  init();
}

void testm::init()
{
  testarray=(char*)malloc(100);
  memset(testarray, 0, 100);

  testarray1 = (char**)malloc(2 * sizeof(char*));
  for (int i = 0; i < 2; i++) 
  {
    testarray1[i] = (char*)malloc(16 * sizeof(char));
    memset(testarray1[i], 0, 16);
  }  

  
}
8

BTW, I can resume that using malloc() with Arduino isn't good way, I've found very simple and good way out, Static memory pre-allocation - https://www.quora.com/Why-is-malloc-harmful-in-embedded-systems

9 
start

array:0,0,0,0,0,0,0,0,0,0,
array1-0
0,0,0,0,0,0,0,0,0,0,
array1-1
0,0,0,0,0,0,0,0,0,0,

array:0,0,0,0,0,0,0,0,0,0,
array1-0
0,0,0,0,0,0,0,0,0,0,
array1-1
0,0,0,0,0,0,0,0,0,0,

...is what I get.

10

That was my fault, somehow the test app wasn't working properly, now I get the main project working, there were mistake in my constructor.