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[Frama-c-discuss] Small function on buffer doesn't verify

  • Subject: [Frama-c-discuss] Small function on buffer doesn't verify
  • From: hollas at informatik.htw-dresden.de (Boris Hollas)
  • Date: Tue, 11 May 2010 17:21:40 +0200
Jessie is unable to verify the following code for reasons that I don't
understand. I get "?" for postcondition, pointer dereferencing,
arithmetic overflow. Using #define instead of const doesn't work either
because it seems that Jessie doesn't read #defines.


const int BUFF_SIZE = 4;

/*@ requires \valid(msg+(0..BUFF_SIZE));
    ensures msg[BUFF_SIZE] == '\0';
*/
int setFoo(char* msg) {
  msg[BUFF_SIZE] = '\0';
  msg[BUFF_SIZE-1] = '\0';
  return 0;
}