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pointer.c

/**************************************************************************/
/*                                                                        */
/*  The Why/Caduceus/Krakatoa tool suite for program certification        */
/*  Copyright (C) 2002-2006                                               */
/*    Jean-Franšois COUCHOT                                               */
/*    Mehdi DOGGUY                                                        */
/*    Jean-Christophe FILLI┬TRE                                           */
/*    Thierry HUBERT                                                      */
/*    Claude MARCH╔                                                       */
/*    Yannick MOY                                                         */
/*                                                                        */
/*  This software is free software; you can redistribute it and/or        */
/*  modify it under the terms of the GNU General Public                   */
/*  License version 2, as published by the Free Software Foundation.      */
/*                                                                        */
/*  This software is distributed in the hope that it will be useful,      */
/*  but WITHOUT ANY WARRANTY; without even the implied warranty of        */
/*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.                  */
/*                                                                        */
/*  See the GNU General Public License version 2 for more details         */
/*  (enclosed in the file GPL).                                           */
/*                                                                        */
/**************************************************************************/

/* C tests with pointers */

/*@ requires \valid(x)
  @ assigns *x
  @ ensures *x == 1 && \result == 0 */
int f(int *x) {
  *x = 0;
  return (*x)++;
} 

/*@ requires \valid(x)
  @ ensures *x == 1 && \result == 1 */
int f2(int *x) {
  *x = 0;
  return ++(*x);
} 

int* r;


/*@ requires \valid(r)
  @ ensures *r == 1 */
int g() { 
  return f(r); 
}

/*@ ensures *r == 1 */
int g2() { 
  r = (int*)malloc(sizeof(int));
  return f(r); 
}

/*@ ensures \result == 1 */
int h() { int z; z = 0; return f(&z) + z; }


int t[5];

//@ requires \valid_index(t,2) ensures \result == 1 
int array1() {
  int * p;
  p = &t[2];
  return *p++ = 1;
}

/* pointers and structures */

struct S { int x; int y; } s;

//@ requires \valid(s)  ensures \result >= 1
int struct1(int n) { 
  int * p = &s.x;
  *p = 1;
  s.y = 2;
  return *p; 
}

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