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When creating multibyte or unibyte strings, we should guarantee the following invariants: - When creating empty strings, a NULL data pointer should be allowed. This often arises in practice if the string length isn't known in advance, and we don't want to unnecessarily trigger undefined behavior. Since functions like memcpy might not accept NULL pointers, use the canonical empty string objects in this case. - Nonzero strings should be guaranteed to be unique and mutable. These are the same guarantees expected from Lisp functions such as 'make-string' or 'unibyte-string'. On the other hand, empty strings might not be unique. * src/emacs-module.c (module_make_string) (module_make_unibyte_string): Correctly handle empty strings. * test/src/emacs-module-resources/mod-test.c (Fmod_test_make_string): New test function. (emacs_module_init): Expose it. * test/src/emacs-module-tests.el (mod-test-make-string/empty) (mod-test-make-string/nonempty): New unit tests. * doc/lispref/internals.texi (Module Values): Document properties and corner cases for strings. |
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| .. | ||
| emacs-module-resources | ||
| lread-resources | ||
| regex-resources | ||
| syntax-resources | ||
| alloc-tests.el | ||
| buffer-tests.el | ||
| callint-tests.el | ||
| callproc-tests.el | ||
| casefiddle-tests.el | ||
| charset-tests.el | ||
| chartab-tests.el | ||
| cmds-tests.el | ||
| coding-tests.el | ||
| data-tests.el | ||
| decompress-tests.el | ||
| editfns-tests.el | ||
| emacs-module-tests.el | ||
| eval-tests.el | ||
| fileio-tests.el | ||
| floatfns-tests.el | ||
| fns-tests.el | ||
| font-tests.el | ||
| indent-tests.el | ||
| inotify-tests.el | ||
| json-tests.el | ||
| keyboard-tests.el | ||
| keymap-tests.el | ||
| lcms-tests.el | ||
| lread-tests.el | ||
| marker-tests.el | ||
| minibuf-tests.el | ||
| print-tests.el | ||
| process-tests.el | ||
| regex-emacs-tests.el | ||
| syntax-tests.el | ||
| textprop-tests.el | ||
| thread-tests.el | ||
| timefns-tests.el | ||
| undo-tests.el | ||
| xdisp-tests.el | ||
| xfaces-tests.el | ||
| xml-tests.el | ||