Hmmm...if a binary file has 32-bit values that are in sort and that all have their<br>high-order bits set, it might be because it contains signed values that are all<br>pre-epoch. It might also be because it contains unsigned values that are all<br>
post-2038--that's unlikely now, but likelier as time goes by.<br><br>If we're lucky, 32-bit systems will be a thing of the past by the time it's likely.<br>That being so, I've attached a slightly-revised version of Doug Bailey's fixes<br>
(they also appear below, with tabs mangled by Firefox/Gmail).<br><br>Are there any present-day systems with unsigned 64-bit time_t's?<br><br>        --ado<br><br>8.17<br>2110 lines<br>8.18<br>2127 lines<br>*** /tmp/,alocaltime.c    2012-07-10 15:14:38.372363200 -0400<br>
--- /tmp/,blocaltime.c    2012-07-10 15:14:38.509371000 -0400<br>***************<br>*** 5,11 ****<br>  <br>  #ifndef lint<br>  #ifndef NOID<br>! static char    elsieid[] = "@(#)localtime.c    8.17";<br>  #endif /* !defined NOID */<br>
  #endif /* !defined lint */<br>  <br>--- 5,11 ----<br>  <br>  #ifndef lint<br>  #ifndef NOID<br>! static char    elsieid[] = "@(#)localtime.c    8.18";<br>  #endif /* !defined NOID */<br>  #endif /* !defined lint */<br>
  <br>***************<br>*** 277,282 ****<br>--- 277,287 ----<br>      /*<br>      ** And to get the latest zone names into tzname. . .<br>      */<br>+     for (i = 0; i < sp->typecnt; ++i) {<br>+         register const struct ttinfo * const    ttisp = &sp->ttis[i];<br>
+ <br>+         tzname[ttisp->tt_isdst] = &sp->chars[ttisp->tt_abbrind];<br>+     }    <br>      for (i = 0; i < sp->timecnt; ++i) {<br>          register const struct ttinfo * const    ttisp =<br>                              &sp->ttis[<br>
***************<br>*** 489,508 ****<br>          ** signed time_t system but using a data file with<br>          ** unsigned values (or vice versa).<br>          */<br>!         for (i = 0; i < sp->timecnt - 2; ++i)<br>
!             if (sp->ats[i] > sp->ats[i + 1]) {<br>!                 ++i;<br>                  if (TYPE_SIGNED(time_t)) {<br>                      /*<br>                      ** Ignore the end (easy).<br>                      */<br>
!                     sp->timecnt = i;<br>                  } else {<br>                      /*<br>                      ** Ignore the beginning (harder).<br>                      */<br>                      register int    j;<br>
  <br>                      for (j = 0; j + i < sp->timecnt; ++j) {<br>                          sp->ats[j] = sp->ats[j + i];<br>                          sp->types[j] = sp->types[j + i];<br>--- 494,525 ----<br>
          ** signed time_t system but using a data file with<br>          ** unsigned values (or vice versa).<br>          */<br>!         for (i = 0; i < sp->timecnt; ++i)<br>!             if ((i < sp->timecnt - 1 &&<br>
!                 sp->ats[i] > sp->ats[i + 1]) ||<br>!                 (i == sp->timecnt - 1 &&<br>!                 !TYPE_SIGNED(time_t) &&<br>!                 stored == 4 &&<br>!                 sp->ats[i] > INT32_MAX)) {<br>
                  if (TYPE_SIGNED(time_t)) {<br>                      /*<br>                      ** Ignore the end (easy).<br>                      */<br>!                     sp->timecnt = i + 1;<br>                  } else {<br>
                      /*<br>                      ** Ignore the beginning (harder).<br>                      */<br>                      register int    j;<br>  <br>+                     /*<br>+                     ** Keep the record right before the<br>
+                     ** epoch boundary,<br>+                     ** but tweak it so that it starts<br>+                     ** right with the epoch<br>+                     ** (thanks to Doug Bailey).<br>+                     */<br>
+                     sp->ats[i] = 0;<br>                      for (j = 0; j + i < sp->timecnt; ++j) {<br>                          sp->ats[j] = sp->ats[j + i];<br>                          sp->types[j] = sp->types[j + i];<br>
<br>