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-rw-r--r--apt-pkg/contrib/strutl.h21
1 files changed, 21 insertions, 0 deletions
diff --git a/apt-pkg/contrib/strutl.h b/apt-pkg/contrib/strutl.h
index 918ac89c7..b58e69cbd 100644
--- a/apt-pkg/contrib/strutl.h
+++ b/apt-pkg/contrib/strutl.h
@@ -157,6 +157,27 @@ static inline int isspace_ascii_inline(int const c)
return (c >= 9 && c <= 13) || c == ' ';
}
+// StringViewCompareFast - awkward attempt to optimize cache generation /*{{{*/
+#ifdef APT_PKG_EXPOSE_STRING_VIEW
+/**
+ * \brief Faster comparison for string views (compare size before data)
+ *
+ * Still stable, but faster than the normal ordering.
+ * As this is used for package comparison this *MUST* be case insensitive,
+ * as the alternative is to lower case all dependency fields which is slow. */
+static inline int StringViewCompareFast(APT::StringView a, APT::StringView b) {
+ if (a.size() != b.size())
+ return a.size() - b.size();
+ auto l(a.data()), r(b.data());
+ for (auto e(a.size()), i(decltype(e)(0)); i != e; ++i)
+ if (tolower_ascii_inline(l[i]) != tolower_ascii_inline(r[i]))
+ return tolower_ascii(l[i]) < tolower_ascii(r[i]) ? -1 : 1;
+ return 0;
+}
+#endif
+ /*}}}*/
+
+
std::string StripEpoch(const std::string &VerStr);
#define APT_MKSTRCMP(name,func) \