Passing sub-arrays

[skoe]

I try to port an old parser from C to XC, so I can use the channel stuff directly in the same source code.

How to do following in XC (simplified scenario)?

Code: Select all

/* parse "foo 123" */
if (strcmp(cmd, "foo ") == 0)
    val = atoi(cmd + 4);

Yes, this is really simplified, but it shows what I want to do: Give a sub-array (here: substring) to a function without copying something.

Regards,
Thomas

[kster59]

Can't you just pass myVar[4] ?

[richard]

Currently XC has no simple way of passing a slice of an array to another function. I would suggest modifying the function you are calling to take an additional parameter which is the offset from the base of the array it should start from. If you are unable to modify the function you could add C wrapper functions which take the array and offset pair and call the real function after doing the necessary address arithmetic.

[Folknology]

Array slicing a la python would be a wonderful feature to add to XC by the way, given the lack of pointers.

[skoe]

Thank you for the comments, a C wrapper must help once more :)

Yes, there are still many ideas to make XC even better for everyday use. But since it is so easy to mix XC/C/Asm fortunately every problem can be solved obviously.