ext/mbstring: Always pass length to php_mb_get_encoding_or_pass()

We have access to this information, so propagate it instead of calling strlen().
This also removes the newly introduced _ex() variant.

Author: Girgias

ext/mbstring/mbstring.c

@@ -269,12 +269,12 @@ static const mbfl_encoding *php_mb_get_encoding(zend_string *encoding_name, uint
 	}
 }
 
-static const mbfl_encoding *php_mb_get_encoding_or_pass(const char *encoding_name) {
-	if (strcmp(encoding_name, "pass") == 0) {
+static const mbfl_encoding *php_mb_get_encoding_or_pass(const char *encoding_name, size_t encoding_name_len) {
+	if (strncmp(encoding_name, "pass", encoding_name_len) == 0) {
 		return &mbfl_encoding_pass;
 	}
 
-	return mbfl_name2encoding(encoding_name);
+	return mbfl_name2encoding_ex(encoding_name, encoding_name_len);
 }
 
 static size_t count_commas(const char *p, const char *end) {
@@ -761,7 +761,7 @@ static PHP_INI_MH(OnUpdate_mbstring_http_input)
 /* }}} */
 
 static zend_result _php_mb_ini_mbstring_http_output_set(const char *new_value, size_t length) {
-	const mbfl_encoding *encoding = php_mb_get_encoding_or_pass(new_value);
+	const mbfl_encoding *encoding = php_mb_get_encoding_or_pass(new_value, length);
 	if (!encoding) {
 		return FAILURE;
 	}
@@ -1348,7 +1348,7 @@ PHP_FUNCTION(mb_http_output)
 		ZEND_ASSERT(MBSTRG(current_http_output_encoding));
 		RETURN_STRING(MBSTRG(current_http_output_encoding)->name);
 	} else {
-		const mbfl_encoding *encoding = php_mb_get_encoding_or_pass(name);
+		const mbfl_encoding *encoding = php_mb_get_encoding_or_pass(name, name_len);
 		if (!encoding) {
 			zend_argument_value_error(1, "must be a valid encoding, \"%s\" given", name);
 			RETURN_THROWS();