proposed zic.c change to cope with "32 < sizeof (time_t)"

[Arthur David Olson]

Attached is a proposed change to let zic.c cope gracefully when
	32 < sizeof (time_t)

I'll make it part of the ftpable stuff if nobody squawks in the next week.

				--ado

SCCS/s.zic.c: 7.50 vs. 7.51
*** 7.50/zic.c	Sat Oct 21 05:58:46 1995
--- 7.51/zic.c	Sat Oct 21 05:58:47 1995
***************
*** 1,6 ****
  #ifndef lint
  #ifndef NOID
! static char	elsieid[] = "@(#)zic.c	7.50";
  #endif /* !defined NOID */
  #endif /* !defined lint */
  
--- 1,6 ----
  #ifndef lint
  #ifndef NOID
! static char	elsieid[] = "@(#)zic.c	7.51";
  #endif /* !defined NOID */
  #endif /* !defined lint */
  
***************
*** 567,594 ****
  	ifree(toname);
  }
  
  static void
  setboundaries P((void))
  {
  	register time_t	bit;
! 	register int bii;
  
  	for (bit = 1; bit > 0; bit <<= 1)
! 		continue;
! 	if (bit == 0) {		/* time_t is an unsigned type */
! 		tt_signed = FALSE;
! 		min_time = 0;
! 		max_time = ~(time_t) 0;
  		if (sflag)
! 			max_time >>= 1;
  	} else {
! 		tt_signed = TRUE;
! 		min_time = bit;
! 		max_time = bit;
! 		++max_time;
! 		max_time = -max_time;
  		if (sflag)
! 			min_time = 0;
  	}
  	min_year = TM_YEAR_BASE + gmtime(&min_time)->tm_year;
  	max_year = TM_YEAR_BASE + gmtime(&max_time)->tm_year;
--- 567,613 ----
  	ifree(toname);
  }
  
+ #define MAX_BITS_IN_FILE	32
+ 
  static void
  setboundaries P((void))
  {
  	register time_t	bit;
! 	register int	nbits;
! 	register int	bii;
  
+ 	nbits = 0;
  	for (bit = 1; bit > 0; bit <<= 1)
! 		++nbits;
! 	tt_signed = (bit != 0);
! 	if (tt_signed)
! 		++nbits;
! 	if (tt_signed) {
! 		if (nbits <= MAX_BITS_IN_FILE) {
! 			min_time = bit;
! 			max_time = bit;
! 			++max_time;
! 			max_time = -max_time;
! 		} else {
! 			max_time = 1;
! 			max_time <<= (MAX_BITS_IN_FILE - 1);
! 			--max_time;
! 			min_time = max_time;
! 			--min_time;
! 		}
  		if (sflag)
! 			min_time = 0;
  	} else {
! 		min_time = 0;
! 		if (nbits <= MAX_BITS_IN_FILE)
! 			max_time = ~(time_t) 0;
! 		else {
! 			max_time = 1;
! 			max_time <<= MAX_BITS_IN_FILE;
! 			--max_time;
! 		}
  		if (sflag)
! 			max_time >>= 1;
  	}
  	min_year = TM_YEAR_BASE + gmtime(&min_time)->tm_year;
  	max_year = TM_YEAR_BASE + gmtime(&max_time)->tm_year;