strutl: Add APT::String::DisplayLength() function

Returns string length, but unlike std::string::size() it honors
multibyte characters. This allows to properly calculate visible
sizes of console messages.

1 files changed, 2 insertions, 0 deletions

diff --git a/apt-pkg/contrib/strutl.h b/apt-pkg/contrib/strutl.h
index fc02357a8..738480402 100644
--- a/apt-pkg/contrib/strutl.h
+++ b/apt-pkg/contrib/strutl.h
@@ -33,6 +33,8 @@ namespace APT {
       bool Endswith(const std::string &s, const std::string &ending);
       bool Startswith(const std::string &s, const std::string &starting);
       std::string Join(std::vector<std::string> list, const std::string &sep);
+      // Returns string display length honoring multi-byte characters
+      size_t DisplayLength(StringView str);
 
    }
 }