Elevate warnings to Error Exceptions in ext/bcmath

`bcdiv()` and `bcmod()` throw DivisionByZeroError if the divisor is 0,
which matches the behavior of the `/` and `%` operators, and `bcsqrt()`
throws ValueError for negative operands.

Author: cmb69

ext/bcmath/bcmath.c

@@ -23,6 +23,7 @@
 #if HAVE_BCMATH
 
 #include "php_ini.h"
+#include "zend_exceptions.h"
 #include "bcmath_arginfo.h"
 #include "ext/standard/info.h"
 #include "php_bcmath.h"
@@ -284,7 +285,7 @@ PHP_FUNCTION(bcdiv)
 			RETVAL_STR(bc_num2str_ex(result, scale));
 			break;
 		case -1: /* division by zero */
-			php_error_docref(NULL, E_WARNING, "Division by zero");
+			zend_throw_exception_ex(zend_ce_division_by_zero_error, 0, "Division by zero");
 			break;
 	}
 
@@ -326,7 +327,7 @@ PHP_FUNCTION(bcmod)
 			RETVAL_STR(bc_num2str_ex(result, scale));
 			break;
 		case -1:
-			php_error_docref(NULL, E_WARNING, "Division by zero");
+			zend_throw_exception_ex(zend_ce_division_by_zero_error, 0, "Modulo by zero");
 			break;
 	}
 
@@ -438,7 +439,7 @@ PHP_FUNCTION(bcsqrt)
 	if (bc_sqrt (&result, scale) != 0) {
 		RETVAL_STR(bc_num2str_ex(result, scale));
 	} else {
-		php_error_docref(NULL, E_WARNING, "Square root of negative number");
+		zend_value_error("Square root of negative number");
 	}
 
 	bc_free_num(&result);

ext/bcmath/bcmath.stub.php

@@ -6,16 +6,16 @@ function bcsub(string $left_operand, string $right_operand, int $scale = UNKNOWN
 
 function bcmul(string $left_operand, string $right_operand, int $scale = UNKNOWN) : string {}
 
-function bcdiv(string $dividend, string $divisor, int $scale = UNKNOWN) : ?string {}
+function bcdiv(string $dividend, string $divisor, int $scale = UNKNOWN) : string {}
 
-function bcmod(string $dividend, string $divisor, int $scale = UNKNOWN) : ?string {}
+function bcmod(string $dividend, string $divisor, int $scale = UNKNOWN) : string {}
 
 /** @return string|false */
 function bcpowmod(string $base, string $exponent, string $modulus, int $scale = UNKNOWN) {}
 
 function bcpow(string $base, string $exponent, int $scale = UNKNOWN) : string {}
 
-function bcsqrt(string $operand, int $scale = UNKNOWN) : ?string {}
+function bcsqrt(string $operand, int $scale = UNKNOWN) : string {}
 
 function bccomp(string $left_operand, string $right_operand, int $scale = UNKNOWN) : int {}
 

ext/bcmath/bcmath_arginfo.h

@@ -10,7 +10,7 @@ ZEND_END_ARG_INFO()
 
 #define arginfo_bcmul arginfo_bcadd
 
-ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_bcdiv, 0, 2, IS_STRING, 1)
+ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_bcdiv, 0, 2, IS_STRING, 0)
 	ZEND_ARG_TYPE_INFO(0, dividend, IS_STRING, 0)
 	ZEND_ARG_TYPE_INFO(0, divisor, IS_STRING, 0)
 	ZEND_ARG_TYPE_INFO(0, scale, IS_LONG, 0)
@@ -31,7 +31,7 @@ ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_bcpow, 0, 2, IS_STRING, 0)
 	ZEND_ARG_TYPE_INFO(0, scale, IS_LONG, 0)
 ZEND_END_ARG_INFO()
 
-ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_bcsqrt, 0, 1, IS_STRING, 1)
+ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_bcsqrt, 0, 1, IS_STRING, 0)
 	ZEND_ARG_TYPE_INFO(0, operand, IS_STRING, 0)
 	ZEND_ARG_TYPE_INFO(0, scale, IS_LONG, 0)
 ZEND_END_ARG_INFO()

ext/bcmath/tests/bcdiv_error1.phpt

@@ -8,7 +8,11 @@ [email protected]
 <?php if(!extension_loaded("bcmath")) print "skip"; ?>
 --FILE--
 <?php
-echo bcdiv('10.99', '0');
+try {
+    bcdiv('10.99', '0');
+} catch (DivisionByZeroError $ex) {
+    echo $ex->getMessage(), PHP_EOL;
+}
 ?>
---EXPECTF--
-Warning: bcdiv(): Division by zero in %s.php on line %d
+--EXPECT--
+Division by zero

ext/bcmath/tests/bcmod_error2.phpt

@@ -6,7 +6,11 @@ bcmod() - mod by 0
 bcmath.scale=0
 --FILE--
 <?php
-echo bcmod("10", "0");
+try {
+    bcmod("10", "0");
+} catch (DivisionByZeroError $ex) {
+    echo $ex->getMessage(), PHP_EOL;
+}
 ?>
---EXPECTF--
-Warning: bcmod(): Division by zero in %s on line %d
+--EXPECT--
+Modulo by zero

ext/bcmath/tests/bcsqrt_error1.phpt

@@ -7,7 +7,11 @@ [email protected]
 <?php if(!extension_loaded("bcmath")) print "skip"; ?>
 --FILE--
 <?php
-echo bcsqrt('-9');
+try {
+    bcsqrt('-9');
+} catch (ValueError $ex) {
+    echo $ex->getMessage(), PHP_EOL;
+}
 ?>
---EXPECTF--
-Warning: bcsqrt(): Square root of negative number in %s.php on line %d
+--EXPECT--
+Square root of negative number