Question

I have problems when using strtok. I want token to has a reserved size so its contents doesn’t corrupt other data (I have small memory, because I’m working over a MCU, not a PC). Then I decided to declare ir as an array with a declared size.

But then I have this error: Assignment invalid: lvalue is READ ONLY

#DEFINE BUFFER_SIZE 128
static int8 buffer[BUFFER_SIZE]; // Declared as global

void myFunction(){
   char separador[3],  token[BUFFER_SIZE], cmd[BUFFER_SIZE];
   strcpy(cmd, buffer); // buffer is a global variable declared ad
   strcpy(separador, ",;"); 
   token = strtok(cmd, separador); // <----- ERROR
   //...
}

What does that error exactly mean? Is it because I haven’t initialised the array? If I declare it as static, would it work?

Answer 1

strtok returns bits of cmd, so you don’t allocate storage for it’s return value. You just want token to be a char*:

char* token;