This page allows links to the FLAME/C implementations of the various algorithms in the paper
Enrique Quintana-Orti and Robert van de Geijn. "Updating an LU Factorization with Pivoting." ACM Transactions on Mathematical Software, to appear.
Download FLA_LU_SA.tgz and perform the commands
tar -xf FLA_LU_SA.tar
The README file explains how the files relate to the algorithms in the paper.