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authorStephan Bergmann <sbergman@redhat.com>2020-02-11 10:31:18 +0100
committerEike Rathke <erack@redhat.com>2020-02-11 18:37:30 +0100
commite8f26dc13b65b1a05d948d9c95110c86315e8f20 (patch)
tree1618195fdc09b559a36c7356bb602e4db07ee1e1 /vcl/source/control/edit.cxx
parentf62e4fb51d72641896b6b8f38fbffb35e6c1b695 (diff)
tdf#130555: Prevent negative aSelection.Min()
...which would violate the the preconditions of the later call to maText.remove. When BreakIteratorImpl::previousWord (i18npool/source/breakiterator/breakiteratorImpl.cxx) is called to e.g. move back over a single space at the start of the text, at least for an en-US locale it will fall through to the call to BreakIterator_Unicode::previousWord (i18npool/source/breakiterator/breakiterator_unicode.cxx) at the bottom of the function. That in turn calls icu::BreakIterator::preceding, which is documented (workdir/UnpackedTarball/icu/source/common/unicode/brkiter.h) to return icu::BreakIterator::DONE (i.e., -1, see workdir/UnpackedTarball/icu/source/common/unicode/brkiter.h) in that case, which causes BreakIterator_Unicode::previousWord to return a Boundary with startPos == endPos == -1. The documentation of UNO method css.i18n.XBreakIterator::previousWord (offapi/com/sun/star/i18n/XBreakIterator.idl) is silent about the expected return value in such a case. But lets assume that returning such a [-1..-1] Boundary is as intended, and locally address this case in Edit::ImplDelete, making aSelection start at the start of the text. Change-Id: I40e17ba602088e72aa6962cb41dd8e1cdf6e2561 Reviewed-on: https://gerrit.libreoffice.org/c/core/+/88431 Tested-by: Jenkins Reviewed-by: Eike Rathke <erack@redhat.com>
Diffstat (limited to 'vcl/source/control/edit.cxx')
-rw-r--r--vcl/source/control/edit.cxx9
1 files changed, 7 insertions, 2 deletions
diff --git a/vcl/source/control/edit.cxx b/vcl/source/control/edit.cxx
index 40c22f9760e1..7045a0c45673 100644
--- a/vcl/source/control/edit.cxx
+++ b/vcl/source/control/edit.cxx
@@ -62,6 +62,7 @@
#include <o3tl/safeint.hxx>
#include <officecfg/Office/Common.hxx>
+#include <algorithm>
#include <memory>
using namespace ::com::sun::star;
@@ -688,10 +689,14 @@ void Edit::ImplDelete( const Selection& rSelection, sal_uInt8 nDirection, sal_uI
{
i18n::Boundary aBoundary = xBI->getWordBoundary( maText.toString(), aSelection.Min(),
GetSettings().GetLanguageTag().getLocale(), i18n::WordType::ANYWORD_IGNOREWHITESPACES, true );
- if ( aBoundary.startPos == aSelection.Min() )
+ auto startPos = aBoundary.startPos;
+ if ( startPos == aSelection.Min() )
+ {
aBoundary = xBI->previousWord( maText.toString(), aSelection.Min(),
GetSettings().GetLanguageTag().getLocale(), i18n::WordType::ANYWORD_IGNOREWHITESPACES );
- aSelection.Min() = aBoundary.startPos;
+ startPos = std::max(aBoundary.startPos, sal_Int32(0));
+ }
+ aSelection.Min() = startPos;
}
else if ( nMode == EDIT_DELMODE_RESTOFCONTENT )
{