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Optionally treat integers as signed numbers with %o and %x format specifiers, instead of treating them as a machine-dependent two’s complement representation. This option is more machine-independent, allows formats like "#x%x" to be useful for reading later, and is better-insulated for future changes involving bignums. Setting the new variable ‘binary-as-unsigned’ to nil enables the new behavior (Bug#32252). This is a simplified version of the change proposed in: https://lists.gnu.org/r/emacs-devel/2018-07/msg00763.html I simplified that proposal by omitting bitwidth modifiers, as I could not find an any example uses in the Emacs source code that needed them and doing them correctly would have been quite a bit more work for apparently little benefit. * doc/lispref/strings.texi (Formatting Strings): Document that %x and %o format negative integers in a platform-dependent way. Also, document how to format numbers so that the same values can be read back in. * etc/NEWS: Document the change. * src/editfns.c (styled_format): Treat integers as signed numbers even with %o and %x, if binary-as-unsigned is nil. Support the + and space flags with %o and %x, since they’re about signs. (syms_of_editfns): New variable binary-as-unsigned. * test/src/editfns-tests.el (read-large-integer): Test that maximal integers can be read after printing with all integer formats, if binary-as-unsigned is nil. |
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This directory contains the architecture-independent files used by or with Emacs. This includes some text files of documentation for GNU Emacs or of interest to Emacs users, and the file of dumped docstrings for Emacs functions and variables. COPYRIGHT AND LICENSE INFORMATION FOR IMAGE FILES File: emacs.icon Author: Sun Microsystems, Inc Copyright (C) 1999, 2001-2018 Free Software Foundation, Inc. License: GNU General Public License version 3 or later (see COPYING)