k_afs_cell_of_file
if(k_afs_cell_of_file(path, cell, sizeof(cell))){
if(k_afs_cell_of_file(pw_dir, cell, sizeof(cell)) == 0)
if (k_afs_cell_of_file (pwd->pw_dir, cell, sizeof(cell)) == 0)
int k_afs_cell_of_file (const char *path, char *cell, int len);
if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0)