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signed long s_a;
signed long s_b;
signed long result;

void func(void) {
  /* initializeInitialize s_a and s_b */
  result = s_a % s_b;

  /* ... */
}

#include <limits.h>

 
signed long s_a;
signed long result;

void func(void) {
  if ((si1 < 0) || (si2 < 0) ||
      (si2 >= UWIDTH(signed long, ULONG_MAX)) ||
      (si1 > (INT_MAX >> si2))) {
    /* handleHandle error condition */
  } else {
    sresult = si1 << si2;
  }


  /* ... */
}