- register UV retval = 0;
- bool overflowed = FALSE;
- while (len && *s >= '0' && *s <= '1') {
- register UV n = retval << 1;
- if (!overflowed && (n >> 1) != retval) {
- warn("Integer overflow in binary number");
- overflowed = TRUE;
- }
- retval = n | (*s++ - '0');
- len--;
- }
- if (len && (*s >= '2' || *s <= '9')) {
- dTHR;
- if (ckWARN(WARN_UNSAFE))
- warner(WARN_UNSAFE, "Illegal binary digit '%c' ignored", *s);
+ register NV rnv = 0.0;
+ register UV ruv = 0;
+ register bool seenb = FALSE;
+ register bool overflowed = FALSE;
+
+ for (; len-- && *s; s++) {
+ if (!(*s == '0' || *s == '1')) {
+ if (*s == '_')
+ continue; /* Note: does not check for __ and the like. */
+ if (seenb == FALSE && *s == 'b' && ruv == 0) {
+ /* Disallow 0bbb0b0bbb... */
+ seenb = TRUE;
+ continue;
+ }
+ else {
+ dTHR;
+ if (ckWARN(WARN_DIGIT))
+ Perl_warner(aTHX_ WARN_DIGIT,
+ "Illegal binary digit '%c' ignored", *s);
+ break;
+ }
+ }
+ if (!overflowed) {
+ register UV xuv = ruv << 1;
+
+ if ((xuv >> 1) != ruv) {
+ dTHR;
+ overflowed = TRUE;
+ rnv = (NV) ruv;
+ if (ckWARN_d(WARN_OVERFLOW))
+ Perl_warner(aTHX_ WARN_OVERFLOW,
+ "Integer overflow in binary number");
+ } else
+ ruv = xuv | (*s - '0');
+ }
+ if (overflowed) {
+ rnv *= 2;
+ /* If an NV has not enough bits in its mantissa to
+ * represent an UV this summing of small low-order numbers
+ * is a waste of time (because the NV cannot preserve
+ * the low-order bits anyway): we could just remember when
+ * did we overflow and in the end just multiply rnv by the
+ * right amount. */
+ rnv += (*s - '0');
+ }
+ }
+ if (!overflowed)
+ rnv = (NV) ruv;
+ if ( ( overflowed && rnv > 4294967295.0)
+#if UVSIZE > 4
+ || (!overflowed && ruv > 0xffffffff )
+#endif
+ ) {
+ dTHR;
+ if (ckWARN(WARN_PORTABLE))
+ Perl_warner(aTHX_ WARN_PORTABLE,
+ "Binary number > 0b11111111111111111111111111111111 non-portable");