Add switch error handling to other strpos variants

Author: Girgias

ext/mbstring/mbstring.c

@@ -2117,6 +2117,7 @@ PHP_FUNCTION(mb_strpos)
 	} else {
 		switch (-n) {
 		case 1:
+			/* Returns false */
 			break;
 		case 2:
 			zend_value_error("Needle has not positive length");
@@ -2167,6 +2168,23 @@ PHP_FUNCTION(mb_strrpos)
 	if (!mbfl_is_error(n)) {
 		RETVAL_LONG(n);
 	} else {
+		switch (-n) {
+		case 1:
+			/* Returns false */
+			break;
+		case 2:
+			zend_value_error("Needle has not positive length");
+			RETURN_THROWS();
+		case 4:
+			zend_value_error("Unknown encoding or conversion error");
+			RETURN_THROWS();
+		case 8:
+			zend_value_error("Argument is empty");
+			RETURN_THROWS();
+		default:
+			zend_value_error("Unknown error in mb_strrpos");
+			RETURN_THROWS();
+		}
 		RETVAL_FALSE;
 	}
 }
@@ -2190,6 +2208,23 @@ PHP_FUNCTION(mb_stripos)
 	if (!mbfl_is_error(n)) {
 		RETVAL_LONG(n);
 	} else {
+		switch (-n) {
+		case 1:
+			/* Returns false */
+			break;
+		case 2:
+			zend_value_error("Needle has not positive length");
+			RETURN_THROWS();
+		case 4:
+			zend_value_error("Unknown encoding or conversion error");
+			RETURN_THROWS();
+		case 8:
+			zend_value_error("Argument is empty");
+			RETURN_THROWS();
+		default:
+			zend_value_error("Unknown error in mb_stripos");
+			RETURN_THROWS();
+		}
 		RETVAL_FALSE;
 	}
 }
@@ -2213,6 +2248,23 @@ PHP_FUNCTION(mb_strripos)
 	if (!mbfl_is_error(n)) {
 		RETVAL_LONG(n);
 	} else {
+		switch (-n) {
+		case 1:
+			/* Returns false */
+			break;
+		case 2:
+			zend_value_error("Needle has not positive length");
+			RETURN_THROWS();
+		case 4:
+			zend_value_error("Unknown encoding or conversion error");
+			RETURN_THROWS();
+		case 8:
+			zend_value_error("Argument is empty");
+			RETURN_THROWS();
+		default:
+			zend_value_error("Unknown error in mb_strripos");
+			RETURN_THROWS();
+		}
 		RETVAL_FALSE;
 	}
 }