Fixed the sign to be PLUS if the result is 0 (php#15599)

ext/bcmath/libbcmath/src/div.c

@@ -478,8 +478,12 @@ bool bc_divide(bc_num numerator, bc_num divisor, bc_num *quot, size_t scale)
 
 	/* do divide */
 	bc_do_div(numeratorend, numerator_readable_len, numerator_bottom_extension, divisorend, divisor_len, quot, quot_full_len);
-	(*quot)->n_sign = numerator->n_sign == divisor->n_sign ? PLUS : MINUS;
 	_bc_rm_leading_zeros(*quot);
+	if (bc_is_zero(*quot)) {
+		(*quot)->n_sign = PLUS;
+	} else {
+		(*quot)->n_sign = numerator->n_sign == divisor->n_sign ? PLUS : MINUS;
+	}
 
 	return true;
 }

ext/bcmath/libbcmath/src/floor_or_ceil.c

@@ -30,7 +30,7 @@ bc_num bc_floor_or_ceil(bc_num num, bool is_floor)
 	/* If the number is positive and we are flooring, then nothing else needs to be done.
 	 * Similarly, if the number is negative and we are ceiling, then nothing else needs to be done. */
 	if (num->n_scale == 0 || result->n_sign == (is_floor ? PLUS : MINUS)) {
-		return result;
+		goto check_zero;
 	}
 
 	/* check fractional part. */
@@ -43,12 +43,19 @@ bc_num bc_floor_or_ceil(bc_num num, bool is_floor)
 
 	/* If all digits past the decimal point are 0 */
 	if (count == 0) {
-		return result;
+		goto check_zero;
 	}
 
 	/* Increment the absolute value of the result by 1 and add sign information */
 	bc_num tmp = _bc_do_add(result, BCG(_one_));
 	tmp->n_sign = result->n_sign;
 	bc_free_num(&result);
-	return tmp;
+	result = tmp;
+
+check_zero:
+	if (bc_is_zero(result)) {
+		result->n_sign = PLUS;
+	}
+
+	return result;
 }

ext/bcmath/libbcmath/src/round.c

@@ -76,7 +76,7 @@ void bc_round(bc_num num, zend_long precision, zend_long mode, bc_num *result)
 			if (*nptr >= 5) {
 				goto up;
 			} else if (*nptr < 5) {
-				return;
+				goto check_zero;
 			}
 			break;
 
@@ -86,14 +86,14 @@ void bc_round(bc_num num, zend_long precision, zend_long mode, bc_num *result)
 			if (*nptr > 5) {
 				goto up;
 			} else if (*nptr < 5) {
-				return;
+				goto check_zero;
 			}
 			/* if *nptr == 5, we need to look-up further digits before making a decision. */
 			break;
 
 		case PHP_ROUND_CEILING:
 			if (num->n_sign != PLUS) {
-				return;
+				goto check_zero;
 			} else if (*nptr > 0) {
 				goto up;
 			}
@@ -102,15 +102,15 @@ void bc_round(bc_num num, zend_long precision, zend_long mode, bc_num *result)
 
 		case PHP_ROUND_FLOOR:
 			if (num->n_sign != MINUS) {
-				return;
+				goto check_zero;
 			} else if (*nptr > 0) {
 				goto up;
 			}
 			/* if *nptr == 0, a loop is required for judgment. */
 			break;
 
 		case PHP_ROUND_TOWARD_ZERO:
-			return;
+			goto check_zero;
 
 		case PHP_ROUND_AWAY_FROM_ZERO:
 			if (*nptr > 0) {
@@ -139,17 +139,17 @@ void bc_round(bc_num num, zend_long precision, zend_long mode, bc_num *result)
 		case PHP_ROUND_CEILING:
 		case PHP_ROUND_FLOOR:
 		case PHP_ROUND_AWAY_FROM_ZERO:
-			return;
+			goto check_zero;
 
 		case PHP_ROUND_HALF_EVEN:
 			if (rounded_len == 0 || num->n_value[rounded_len - 1] % 2 == 0) {
-				return;
+				goto check_zero;
 			}
 			break;
 
 		case PHP_ROUND_HALF_ODD:
 			if (rounded_len != 0 && num->n_value[rounded_len - 1] % 2 == 1) {
-				return;
+				goto check_zero;
 			}
 			break;
 
@@ -176,4 +176,9 @@ void bc_round(bc_num num, zend_long precision, zend_long mode, bc_num *result)
 		bc_free_num(result);
 		*result = tmp;
 	}
+
+check_zero:
+	if (bc_is_zero(*result)) {
+		(*result)->n_sign = PLUS;
+	}
 }