| Subject: | not modify readonly scalars |
| Date: | Tue, 19 Jan 2010 09:02:48 +1100 |
| To: | bug-File-Map [...] rt.cpan.org |
| From: | Kevin Ryde <user42 [...] zip.com.au> |
If map_file() is given a readonly scalar I think it should refuse to
change the value, so as to protect scalars intended to be constants,
making a program like readonly.pl below get an error. I think it would
be as easy as
if (SvREADONLY(var))
Perl_croak(aTHX_ Perl_get_no_modify(aTHX));
(If I understand the Perl_get_no_modify() func being meant for
portability to ms-dos where cross-library variables don't work, or
something like that. The function form is new in perl 5.005 or some
such, but could be a candidate for ppport.h if earlier was wanted.)
Protecting readonlys also has the happy effect of preventing `undef' or
similar specials accidentally getting modified when prototypes are not
in effect, per undef.pl below.
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