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| author | Father Chrysostomos <sprout@cpan.org> | 2013-07-23 13:15:34 -0700 |
|---|---|---|
| committer | Father Chrysostomos <sprout@cpan.org> | 2013-08-25 12:22:40 -0700 |
| commit | 25fdce4a165b6305e760d4c8d94404ce055657a0 (patch) | |
| tree | 7c3aa76b83b1518991bf23909ee072c55de29138 /embed.h | |
| parent | 428ccf1e2d78d72b07c5e959e967569a82ce07ba (diff) | |
| download | perl-25fdce4a165b6305e760d4c8d94404ce055657a0.tar.gz | |
Stop pos() from being confused by changing utf8ness
The value of pos() is stored as a byte offset. If it is stored on a
tied variable or a reference (or glob), then the stringification could
change, resulting in pos() now pointing to a different character off-
set or pointing to the middle of a character:
$ ./perl -Ilib -le '$x = bless [], chr 256; pos $x=1; bless $x, a; print pos $x'
2
$ ./perl -Ilib -le '$x = bless [], chr 256; pos $x=1; bless $x, "\x{1000}"; print pos $x'
Malformed UTF-8 character (unexpected end of string) in match position at -e line 1.
0
So pos() should be stored as a character offset.
The regular expression engine expects byte offsets always, so allow it
to store bytes when possible (a pure non-magical string) but use char-
acters otherwise.
This does result in more complexity than I should like, but the alter-
native (always storing a character offset) would slow down regular
expressions, which is a big no-no.
Diffstat (limited to 'embed.h')
| -rw-r--r-- | embed.h | 1 |
1 files changed, 1 insertions, 0 deletions
@@ -872,6 +872,7 @@ #define regprop(a,b,c) Perl_regprop(aTHX_ a,b,c) #define report_uninit(a) Perl_report_uninit(aTHX_ a) #define sv_magicext_mglob(a) Perl_sv_magicext_mglob(aTHX_ a) +#define sv_or_pv_pos_u2b(a,b,c,d) S_sv_or_pv_pos_u2b(aTHX_ a,b,c,d) #define validate_proto(a,b,c) Perl_validate_proto(aTHX_ a,b,c) #define vivify_defelem(a) Perl_vivify_defelem(aTHX_ a) #define yylex() Perl_yylex(aTHX) |