I am trying to download the source package including strlen.c, which one should I be getting, how?
I have tried looking at the different glibc/eglibc/... variants but got confused as to which one to really get.
I am a beginner with apt-cache/apt-get/aptitude/dpkg/etc.

strlen.cshould be in the libc6 source package – steabert Aug 25 '12 at 8:29