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#include <limits.h>
 
void func(signed long s_a) {
  signed long result;
  if (s_a == INTLONG_MIN) {
    /* Handle error */
  } else {
    result = -s_a;
  }
  /* ... */
}

#include <limits.h>

void func(signed long si_a, signed long si_b) {
  signed long result;
  if ((si_a < 0) || (si_b < 0) ||
      (si_b >= UWIDTH(signed long, ULONG_MAX)) ||
      (si_a > (INTLONG_MAX >> si_b))) {
    /* Handle error */
  } else {
    result = si1 << si2;
  }
 
  /* ... */
}