From: Paul Eggert Date: Thu, 29 Mar 2018 18:01:38 +0000 (-0700) Subject: New experimental variable read-integer-overflow-as-float. X-Git-Tag: emacs-27.0.90~5368 X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=c213f465ba8038ce93314b96fd53ec3e35d34609;p=emacs.git New experimental variable read-integer-overflow-as-float. Following a suggestion by Eli Zaretskii (Bug#30408#46). * etc/NEWS: Mention it. * src/lread.c (syms_of_lread): Add it. (read1): Treat out-of-range integers as floats if read-integer-overflow-as-float is non-nil. --- diff --git a/etc/NEWS b/etc/NEWS index 9161f2bd323..9dddc902130 100644 --- a/etc/NEWS +++ b/etc/NEWS @@ -356,8 +356,10 @@ implementation to format (Bug#30408). ** The Lisp reader now signals an overflow for plain decimal integers that do not end in '.' and are outside Emacs range. Formerly the Lisp reader silently converted them to floating-point numbers, and signaled -overflow only for integers with a radix that are outside machine range -(Bug#30408). +overflow only for integers with a radix that are outside machine range. +To get the old behavior, set the new, experimental variable +read-integer-overflow-as-float to t and please email +30408@debbugs.gnu.org if you need that. (Bug#30408). --- ** Some functions and variables obsolete since Emacs 22 have been removed: diff --git a/src/lread.c b/src/lread.c index a774524ee43..8fb61f56338 100644 --- a/src/lread.c +++ b/src/lread.c @@ -3502,7 +3502,9 @@ read1 (Lisp_Object readcharfun, int *pch, bool first_in_list) if (!quoted && !uninterned_symbol) { - Lisp_Object result = string_to_number (read_buffer, 10, 0); + int flags = (read_integer_overflow_as_float + ? S2N_OVERFLOW_TO_FLOAT : 0); + Lisp_Object result = string_to_number (read_buffer, 10, flags); if (! NILP (result)) return unbind_to (count, result); } @@ -4830,6 +4832,13 @@ were read in. */); doc: /* Non-nil means read recursive structures using #N= and #N# syntax. */); Vread_circle = Qt; + DEFVAR_BOOL ("read-integer-overflow-as-float", + read_integer_overflow_as_float, + doc: /* Non-nil means `read' quietly treats an out-of-range integer as floating point. +Nil (the default) means signal an overflow unless the integer ends in `.'. +This variable is experimental; email 30408@debbugs.gnu.org if you need it. */); + read_integer_overflow_as_float = false; + DEFVAR_LISP ("load-path", Vload_path, doc: /* List of directories to search for files to load. Each element is a string (directory file name) or nil (meaning