make buffer length warnings more verbose

main/user_streams.c

@@ -262,8 +262,9 @@ static size_t php_userstreamop_write(php_stream *stream, const char *buf, size_t
 
 	/* don't allow strange buffer overruns due to bogus return */
 	if (didwrite > count) {
-		zend_error(E_WARNING, "%s::" USERSTREAM_WRITE " - wrote more data than requested",
-				us->wrapper->classname);
+		zend_error(E_WARNING, "%s::" USERSTREAM_WRITE " - wrote %d bytes more data than requested (%d written, %d max)",
+				us->wrapper->classname,
+				didwrite - count, didwrite, count);
 		didwrite = count;
 	}
 	
@@ -317,8 +318,8 @@ static size_t php_userstreamop_read(php_stream *stream, char *buf, size_t count
 		if (retval && Z_TYPE_P(retval) == IS_STRING) {
 			didread = Z_STRLEN_P(retval);
 			if (didread > count) {
-				zend_error(E_WARNING, "%s::" USERSTREAM_READ " - read more data than requested; some data will be lost",
-						us->wrapper->classname);
+				zend_error(E_WARNING, "%s::" USERSTREAM_READ " - read %d bytes more data than requested (%d read, %d max) - excess data will be lost",
+						us->wrapper->classname, didread - count, didread, count);
 				didread = count;
 			}
 			if (didread > 0)