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#define ABS(x) (((x) < 0) ? -(x) : (x))
 
void func(int n) {
  /* Validate n is within the desired range. */
  int m = ABS(++n);

  /* ... */
}

#define ABS(x) (((x) < 0) ? -(x) : (x)) /* UNSAFE */
 
void func(int n) {
  /* Validate n is within the desired range. */
  ++n;
  int m = ABS(n);

  /* ... */
}

inline int abs(int x) {
  return (((x) < 0) ? -(x) : (x));
}

void func(int n) {
  /* Validate n is within the desired range. */
  int m = abs(++n);
  /* ... */
}