fergalmoran/ladybird
1
0
Fork 0
mirror of https://github.com/fergalmoran/ladybird.git synced 2026-01-31 12:54:11 +00:00
Code Issues Packages Projects Releases Wiki Activity

LibRegex: Correctly advance string positions in Compare::compare_string

Browse Source 
Fixes a bug where backreferences could cause desync between the
code point index and regular index, making comparison off-by-N.
This commit is contained in:
Ali Mohammad Pur
2021-09-01 03:09:10 +04:30
committed by Andreas Kling
parent dd82c2e9b4
commit 9b2f0613ef
1 changed files with 7 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
Userland/Libraries/LibRegex/RegexByteCode.cpp
View File

@@ -102,6 +102,12 @@ static void advance_string_position(MatchState& state, RegexStringView const& vi
}
}
static void advance_string_position(MatchState& state, RegexStringView const&, RegexStringView const& advance_by)
{
state.string_position += advance_by.length();
state.string_position_in_code_units += advance_by.length_in_code_units();
}
static void reverse_string_position(MatchState& state, RegexStringView const& view, size_t amount)
{
VERIFY(state.string_position >= amount);
@@ -606,7 +612,7 @@ ALWAYS_INLINE bool OpCode_Compare::compare_string(MatchInput const& input, Match
equals = subject.equals(str);
if (equals)
state.string_position += str.length();
advance_string_position(state, input.view, str);
return equals;
}