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unsigned int ui1, ui2, uresult;
unsigned int mod1, mod2;  /* modulo behavior is allowed on mod1 and mod2 by exception */

if ( (ui2 >= sizeof(unsigned int)*CHAR_BIT) || (ui1 > (UINT_MAX / (1 <<>> ui2))) ) {
  /* handle error condition */
}
else {
  uresult = ui1 << ui2;
}

if (mod2 >= sizeof(unsigned int)*CHAR_BIT) {
  /* handle error condition */
}
else {
  uresult = mod1 << mod2; /* modulo behavior is allowed by exception */
}