Function uptodate

src/version.c:712–746

this used to be based on file date and somewhat OS-dependent, * but now examines the initial part of the file's contents. * * returns: * * SF_UPTODATE (0) everything matched and looks good * SF_OUTDATED (1) savefile is outdated * SF_CRITICAL_BYTE_COUNT_MISMATCH (2) critical size count mismatch * SF_DM_IL32LLP64_ON_ILP32LL64 (3) Windows x6

 *   SF_DM_MISMATCH                  (9) some other mismatch
 */
int
uptodate(NHFILE *nhfp, const char *name, unsigned long utdflags)
{
#ifdef SFCTOOL
    extern struct version_info vers_info;
#else
    struct version_info vers_info;
#endif
    char indicator;
    int sfstatus = 0, idx_1st_mismatch = 0;
    boolean quietly = (utdflags & UTD_QUIETLY) != 0;
    boolean verbose = name ? TRUE : FALSE;

    Sfi_char(nhfp, &indicator, "indicate-format", 1);
    if ((sfstatus = compare_critical_bytes(nhfp, &idx_1st_mismatch, utdflags))
                                                             != SF_UPTODATE) {
        if (sfstatus > 0 && idx_1st_mismatch) {
            if (!quietly)
                raw_printf("comparison of critical bytes mismatched at %d (%s).",
                           critical_sizes[idx_1st_mismatch].ucsize,
                           critical_sizes[idx_1st_mismatch].nm);
        }
    }

    Sfi_version_info(nhfp, &vers_info, "version_info");
    if (!check_version(&vers_info, name, verbose, utdflags)) {
        if (verbose) {
            if ((utdflags & UTD_WITHOUT_WAITSYNCH_PERFILE) == 0) {
                wait_synch();
            }
        }
        return SF_OUTDATED;
    }
    return sfstatus;
}

/*
 * returns: