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Use memmove instead of strcat

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strcat does not allow overlapping ranges; we didn't have a test for this
but now we do.

As an added bonus, this also means we only compute the length of each
fragment once now.
This commit is contained in:
Arseny Kapoulkine 2023-09-05 22:43:55 -07:00
parent 58616a29aa
commit 30adb1713b
2 changed files with 15 additions and 13 deletions
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20
src/pugixml.cpp
View File

@ -270,18 +270,6 @@ PUGI_IMPL_NS_BEGIN
return static_cast<size_t>(end - s);
#endif
}
// Append one string to another
PUGI_IMPL_FN void strconcat(char_t* dst, const char_t* src)
{
assert(dst && src);
#ifdef PUGIXML_WCHAR_MODE
wcscat(dst, src);
#else
strcat(dst, src);
#endif
}
PUGI_IMPL_NS_END
// auto_ptr-like object for exception recovery
@ -3498,8 +3486,14 @@ PUGI_IMPL_NS_BEGIN
{
assert(merged >= cursor->first_child->prev_sibling_c->value);
// Catch up to the end of last parsed value; only needed for the first fragment.
merged += strlength(merged);
strconcat(merged, parsed_pcdata); // Append PCDATA to the previous one.
size_t length = strlength(parsed_pcdata);
// Must use memmove instead of memcpy as this move may overlap
memmove(merged, parsed_pcdata, (length + 1) * sizeof(char_t));
merged += length;
}
else
{

8
tests/test_parse.cpp
View File

@ -1350,6 +1350,14 @@ TEST(parse_merge_pcdata_append)
CHECK_STRING(doc.child(STR("node")).first_child().value(), STR("hello world"));
}
TEST(parse_merge_pcdata_overlap)
{
xml_document doc;
xml_parse_result res = doc.load_string(STR("<node>short <!-- --> this string is very long so long that copying it will overlap itself</node>"), parse_merge_pcdata);
CHECK(res);
CHECK_STRING(doc.child_value(STR("node")), STR("short this string is very long so long that copying it will overlap itself"));
}
TEST(parse_encoding_detect)
{
char test[] = "<?xml version='1.0' encoding='utf-8'?><n/>";