Using rem in bc_do_div

Author: SakiTakamachi

ext/bcmath/libbcmath/src/div.c

@@ -256,7 +256,8 @@ static void bc_do_div(
 	const char *numerator, size_t numerator_size, size_t numerator_readable_size,
 	const char *divisor, size_t divisor_size,
 	bc_num *quot, size_t quot_size,
-	bool use_quot
+	bc_num *rem, size_t rem_over_size, size_t rem_write_size,
+	bool use_quot, bool use_rem
 ) {
 	size_t numerator_arr_size = BC_ARR_SIZE_FROM_LEN(numerator_size);
 	size_t divisor_arr_size = BC_ARR_SIZE_FROM_LEN(divisor_size);
@@ -298,6 +299,24 @@ static void bc_do_div(
 		char *qend = qptr + (*quot)->n_len + (*quot)->n_scale - 1;
 		bc_convert_vector_to_char(quot_vectors, qptr, qend, quot_real_arr_size);
 	}
+	if (use_rem) {
+		char *rptr = (*rem)->n_value;
+		char *rend = rptr + rem_write_size - 1;
+
+		size_t rem_arr_size = (rem_write_size + rem_over_size + BC_VECTOR_SIZE - 1) / BC_VECTOR_SIZE;
+		if (UNEXPECTED(rem_arr_size > numerator_arr_size)) {
+			/* If numerator_arr_size is exceeded because the integer part is zero */
+			rem_arr_size = numerator_arr_size;
+			*rptr = 0;
+		}
+		BC_VECTOR *rem_vectors = numerator_vectors;
+
+		if (rem_over_size > 0) {
+			bc_convert_vector_to_char_with_skip(rem_vectors, rptr, rend, rem_arr_size, rem_over_size);
+		} else {
+			bc_convert_vector_to_char(rem_vectors, rptr, rend, rem_arr_size);
+		}
+	}
 
 	if (allocation_arr_size > BC_STACK_VECTOR_SIZE) {
 		efree(numerator_vectors);
@@ -524,7 +543,9 @@ bool bc_divide_ex(bc_num numerator, bc_num divisor, bc_num *quot, bc_num *rem, s
 	bc_do_div(
 		numeratorptr, numerator_size, numerator_readable_size,
 		divisorptr, divisor_size,
-		quot, quot_size
+		quot, quot_size,
+		rem, rem_over_size, rem_write_size,
+		use_quot, use_rem
 	);
 
 	if (use_quot) {