tz package
Arthur David Olson
ado
Mon May 30 16:52:46 UTC 1988
> I started looking over your tz package. Thin[g]s look nice. Have you had
> any patches since the posting? My Patchlevel.h file shows I am at
> PATCHLEVEL #1.
No "released to a source moderator" patches yet, and nothing that's very big.
I've attached some "unofficial" diffs to the end of this letter:
Makefile the suggestion to remove "timezone.o" from "libc.a"
is deleted
tzfile.h a redundant definition of TM_SUNDAY is deleted
getopt.c is now the latest version from Berkeley (with an elsie
header on the front to keep sccs happy)
localtime.c has an added workaround for a bug in 3B1s.
The 3B1 workaround is the change I'm least sure of; after I made it I sent it
off to the person who originally reported the problem and asked for a blessing;
I've yet to receive a response. In particular I'm not sure that conditioning
on "m68k" is right; this may just be a 3B1 problem.
A bit back Guy Harris sent along changes to allow localtime to handle
POSIX-style TZ environment variables; as soon as I confirm that it's okay to
do so, I can send these along.
> I suggest that you put a BIG warning around the use of 'leapseconds'
> in time calculations. For a number of reasons, POSIX (IEEE standard
> Unix, soon to be ANSI and ISO standard unix) prohibits the standard
> conversion to/from "Seconds since the Epoch" functions from taking
> leapseconds into account. This means that if anyone does use the
> timezone deltas, their system will be out of conformance. If leapseconds
> are desired, then such systems need to use different time conversion
> functions to do this.
If you could work up a "chapter and verse" explanation, I'd be glad to add it
to the distribution. Presumably the thing to do would be to have LEAPSECONDS
default to /dev/null in the Makefile, with a note in the Makefile on how to
get leapseconds accounted for and an explanation of why you might not want to.
--ado
*** 4.1/Makefile Mon May 30 12:26:20 1988
--- 4.2/Makefile Mon May 30 12:26:33 1988
***************
*** 1,4 ****
! # @(#)Makefile 4.1
# If you want something other than Eastern United States time used on your
# system, change the line below (after finding the zone you want in the
--- 1,4 ----
! # @(#)Makefile 4.2
# If you want something other than Eastern United States time used on your
# system, change the line below (after finding the zone you want in the
***************
*** 14,20 ****
# You may want to change this define if you're just testing the software.
# Alternatively, you can put these functions in /lib/libc.a, removing
! # the old "ctime.o" (and "timezone.o" on a BSD system). This is the
# ideal solution if you are able. Build libz.a, extract the files, and
# then add them to libc.a.
--- 14,20 ----
# You may want to change this define if you're just testing the software.
# Alternatively, you can put these functions in /lib/libc.a, removing
! # the old "ctime.o". This is the
# ideal solution if you are able. Build libz.a, extract the files, and
# then add them to libc.a.
*** 4.1/getopt.c Mon May 30 12:27:21 1988
--- 4.2/getopt.c Mon May 30 12:27:22 1988
***************
*** 1,16 ****
#ifndef lint
#ifndef NOID
! static char elsieid[] = "@(#)getopt.c 4.1";
#endif /* !defined NOID */
#endif /* !defined lint */
/*LINTLIBRARY*/
! #include "string.h"
! #ifndef strchr
! #define index strchr
! #endif /* !defined strchr */
#include <stdio.h>
--- 1,28 ----
#ifndef lint
#ifndef NOID
! static char elsieid[] = "@(#)getopt.c 4.2";
#endif /* !defined NOID */
#endif /* !defined lint */
/*LINTLIBRARY*/
! /*
! * Copyright (c) 1987 Regents of the University of California.
! * All rights reserved.
! *
! * Redistribution and use in source and binary forms are permitted
! * provided that this notice is preserved and that due credit is given
! * to the University of California at Berkeley. The name of the University
! * may not be used to endorse or promote products derived from this
! * software without specific written prior permission. This software
! * is provided ``as is'' without express or implied warranty.
! */
! #ifdef LIBC_SCCS
! #ifndef lint
! static char sccsid[] = "@(#)getopt.c 4.5 (Berkeley) 11/24/87";
! #endif /* !defined lint */
! #endif /* defined LIBC_SCCS */
#include <stdio.h>
***************
*** 17,23 ****
/*
* get option letter from argument vector
*/
! int opterr = 1, /* useless, never set or used */
optind = 1, /* index into parent argv vector */
optopt; /* character checked for validity */
char *optarg; /* argument associated with option */
--- 29,35 ----
/*
* get option letter from argument vector
*/
! int opterr = 1, /* if error message should be printed */
optind = 1, /* index into parent argv vector */
optopt; /* character checked for validity */
char *optarg; /* argument associated with option */
***************
*** 24,65 ****
#define BADCH (int)'?'
#define EMSG ""
! #define tell(s) fputs(*nargv,stderr);fputs(s,stderr); \
! fputc(optopt,stderr);fputc('\n',stderr);return(BADCH);
! getopt(nargc,nargv,ostr)
! int nargc;
! char **nargv,
! *ostr;
{
! static char *place = EMSG; /* option letter processing */
! register char *oli; /* option letter list index */
char *index();
! if(!*place) { /* update scanning pointer */
! if(optind >= nargc || *(place = nargv[optind]) != '-' || !*++place) return(EOF);
! if (*place == '-') { /* found "--" */
++optind;
return(EOF);
}
! } /* option letter okay? */
! if ((optopt = (int)*place++) == (int)':' || !(oli = index(ostr,optopt))) {
! if(!*place) ++optind;
tell(": illegal option -- ");
}
! if (*++oli != ':') { /* don't need argument */
optarg = NULL;
! if (!*place) ++optind;
}
! else { /* need an argument */
! if (*place) optarg = place; /* no white space */
else if (nargc <= ++optind) { /* no arg */
place = EMSG;
tell(": option requires an argument -- ");
}
! else optarg = nargv[optind]; /* white space */
place = EMSG;
++optind;
}
! return(optopt); /* dump back option letter */
}
--- 36,90 ----
#define BADCH (int)'?'
#define EMSG ""
! #define tell(s) { \
! if (opterr) { \
! fputs(*nargv, stderr); \
! fputs(s, stderr); \
! fputc(optopt, stderr); \
! fputc((int)'\n', stderr); \
! } \
! return(BADCH); \
! }
! getopt(nargc, nargv, ostr)
! int nargc;
! char **nargv, *ostr;
{
! static char *place = EMSG; /* option letter processing */
! register char *oli; /* option letter list index */
char *index();
! if (!*place) { /* update scanning pointer */
! if (optind >= nargc || *(place = nargv[optind]) != '-' ||
! !*++place)
! return(EOF);
! if (*place == '-') { /* found "--" */
++optind;
return(EOF);
}
! } /* option letter okay? */
! if ((optopt = (int)*place++) == (int)':' ||
! !(oli = index(ostr, optopt))) {
! if (!*place)
! ++optind;
tell(": illegal option -- ");
}
! if (*++oli != ':') { /* don't need argument */
optarg = NULL;
! if (!*place)
! ++optind;
}
! else { /* need an argument */
! if (*place) /* no white space */
! optarg = place;
else if (nargc <= ++optind) { /* no arg */
place = EMSG;
tell(": option requires an argument -- ");
}
! else /* white space */
! optarg = nargv[optind];
place = EMSG;
++optind;
}
! return(optopt); /* dump back option letter */
}
*** 4.1/tzfile.h Mon May 30 12:25:44 1988
--- 4.2/tzfile.h Mon May 30 12:25:49 1988
***************
*** 2,8 ****
#ifndef NOID
#ifndef TZFILE_H
#define TZFILE_H
! static char tzfilehid[] = "@(#)tzfile.h 4.1";
#endif /* !defined TZFILE_H */
#endif /* !defined NOID */
#endif /* !defined lint */
--- 2,8 ----
#ifndef NOID
#ifndef TZFILE_H
#define TZFILE_H
! static char tzfilehid[] = "@(#)tzfile.h 4.2";
#endif /* !defined TZFILE_H */
#endif /* !defined NOID */
#endif /* !defined lint */
***************
*** 107,113 ****
#define TM_OCTOBER 9
#define TM_NOVEMBER 10
#define TM_DECEMBER 11
- #define TM_SUNDAY 0
#define TM_YEAR_BASE 1900
--- 107,112 ----
*** 4.1/localtime.c Mon May 30 12:49:30 1988
--- 4.6/localtime.c Mon May 30 12:49:47 1988
***************
*** 1,6 ****
#ifndef lint
#ifndef NOID
! static char elsieid[] = "@(#)localtime.c 4.1";
#endif /* !defined NOID */
#endif /* !defined lint */
--- 1,6 ----
#ifndef lint
#ifndef NOID
! static char elsieid[] = "@(#)localtime.c 4.6";
#endif /* !defined NOID */
#endif /* !defined lint */
***************
*** 389,394 ****
--- 389,403 ----
}
days = *clock / SECSPERDAY;
rem = *clock % SECSPERDAY;
+ #ifdef mc68k
+ if (*clock == 0x80000000) {
+ /*
+ ** A 3B1 muffs the division on the most negative number.
+ */
+ days = -24855;
+ rem = -11648;
+ }
+ #endif /* mc68k */
rem += (offset - corr);
while (rem < 0) {
rem += SECSPERDAY;
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