return String from C to XC?

[jerryXCORE]

Just wondering if it is possible to pass 'string' argument back and forth between C and XC?

For example:
Define function In C:

Code: Select all

void func(char str1[])
{     printf("Old:  %s", str1);    //Old: old string
      str1 = "new string";
 };

Call the function from XC:

Code: Select all

      char str1[100] = "old string";
      func(str1);
      printstr("New: "); printstrln(str1);   //New: old string

My observation:
* strings are passed to C successfully!
* but the new value of string is not returned to XC.

[srinie]

Hi,
It works in a similar C 'pass by reference' way.

Notes:
[*] keep an eye of array bound checks explicitly
[*] use string copy instead of direct string assignment
[*] similar to using "unsafe" in xC

Attached is the sample working code.

[jerryXCORE]

Hi, Srinie:

I tried and it works. Thanks a lot!