static char * generate_backup_filename (
backup_mode_ty versionControl,
char * pathname)
{
int last_numbered_version;
char *backup_name;
if (versionControl == none)
{
backup_name = NULL;
}
else
{
if (versionControl == simple)
{
backup_name = simple_backup_name (pathname);
}
else
{
last_numbered_version = max_version (pathname);
if ((versionControl == numbered_existing) && (last_numbered_version == 0))
{
backup_name = simple_backup_name (pathname);
}
else
{
last_numbered_version++;
backup_name = xmalloc(strlen (pathname) + 16);
if (backup_name)
{
sprintf (backup_name, BACKUP_SUFFIX_FORMAT, pathname,
version_width, (int) last_numbered_version);
}
}
}
}
return backup_name;
}
version_t versions_ago(version_t ago) const
{
return max_version()-ago;
}
