libustr-dev 1.0.4-3ubuntu2 (i386 binary) in ubuntu trusty

 ustr (Micro string library) is a string API for C. It has tiny overhead over
 just plain strdup(), is much safer, is easier to use, is faster for many
 operations, can be used with read-only or automatically allocated data. You
 don't even need to link to the library to use it (so there are no
 dependencies).
 .
 This package contains header files and static libraries needed to
 compile applications or shared objects that use ustr.