The problem at hand: the mod.sources version of the time zone compiler sets tzname[1] to "EWT" for the Eastern US; this causes problems with SVVS. I had a realization this morning. A while back I added a "-s" flag to the time zone compiler to let folks produce time zone information files with whose time(2) values were limited to numbers that have the same value whether you take them to be signed or unsigned. This was done to let time zone files be used in network setups where some machines on the network wanted to have signed time_t's and others wanted to have unsigned time_t's. Providentially, if you use the -s option you should get files that let localtime be SVVS compliant. Not only is this in line with kre's suggestion that the work should be done in the compiler rather than in localtime--it's already in place. I've attached diffs for zic.c and zic.8; apologies to those who've seen them before (but note that I've added a new note about SVVS to zic.8). --ado ------------------------------------------------------------------------------- *** 3.1/zic.c Fri Aug 7 10:42:22 1987 --- 3.6/zic.c Fri Aug 7 10:42:39 1987 *************** *** 4,10 **** #ifndef lint #ifndef NOID ! static char sccsid[] = "@(#)zic.c 3.1"; #endif /* !NOID */ #endif /* !lint */ --- 4,10 ---- #ifndef lint #ifndef NOID ! static char sccsid[] = "@(#)zic.c 3.6"; #endif /* !NOID */ #endif /* !lint */ *************** *** 355,361 **** usage() { (void) fprintf(stderr, ! "%s: usage is %s [ -v ] [ -l localtime ] [ -d directory ] [ filename ... ]\n", progname, progname); exit(1); } --- 355,361 ---- usage() { (void) fprintf(stderr, ! "%s: usage is %s [ -s ] [ -v ] [ -l localtime ] [ -d directory ] [ filename ... ]\n", progname, progname); exit(1); } *************** *** 362,367 **** --- 362,368 ---- static char * lcltime = NULL; static char * directory = NULL; + static int sflag = FALSE; main(argc, argv) int argc; *************** *** 374,380 **** umask(umask(022) | 022); #endif progname = argv[0]; ! while ((c = getopt(argc, argv, "d:l:v")) != EOF) switch (c) { default: usage(); --- 375,381 ---- umask(umask(022) | 022); #endif progname = argv[0]; ! while ((c = getopt(argc, argv, "d:l:vs")) != EOF) switch (c) { default: usage(); *************** *** 401,406 **** --- 402,410 ---- case 'v': noise = TRUE; break; + case 's': + sflag = TRUE; + break; } if (optind == argc - 1 && strcmp(argv[optind], "=") == 0) usage(); /* usage message by request */ *************** *** 465,470 **** --- 469,476 ---- tt_signed = FALSE; min_time = 0; max_time = ~(time_t) 0; + if (sflag) + max_time >>= 1; } else { tt_signed = TRUE; min_time = bit; *************** *** 471,476 **** --- 477,484 ---- 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; *************** *** 687,693 **** inrule(fields, nfields) register char ** fields; { ! struct rule r; if (nfields != RULE_FIELDS) { error("wrong number of fields on Rule line"); --- 695,701 ---- inrule(fields, nfields) register char ** fields; { ! static struct rule r; if (nfields != RULE_FIELDS) { error("wrong number of fields on Rule line"); *************** *** 757,763 **** register char ** fields; { register char * cp; ! struct zone z; register int i_gmtoff, i_rule, i_format; register int i_untilyear, i_untilmonth; register int i_untilday, i_untiltime; --- 765,771 ---- register char ** fields; { register char * cp; ! static struct zone z; register int i_gmtoff, i_rule, i_format; register int i_untilyear, i_untilmonth; register int i_untilday, i_untiltime; ------------------------------------------------------------------------------- *** 3.1/zic.8 Fri Aug 7 10:41:29 1987 --- 3.4/zic.8 Fri Aug 7 10:41:32 1987 *************** *** 12,17 **** --- 12,19 ---- .B \-l .I localtime ] [ + .B \-s + ] [ .I filename \&... ] .SH DESCRIPTION *************** *** 43,48 **** --- 45,55 ---- of years representable by .IR time (2) values. + .TP + .B \-s + Limit time values stored in output files to values that are the same + whether they're taken to be signed or unsigned. + You can use this option to generate SVVS-compatible files. .sp Input lines are made up of fields. Fields are separated from one another by any number of white space characters. *************** *** 98,104 **** field. .TP .B TYPE ! Gives the type of year in which the year applies. If .B TYPE is --- 105,111 ---- field. .TP .B TYPE ! Gives the type of year in which the rule applies. If .B TYPE is *************** *** 155,161 **** field. .TP .B AT ! Gives the time of day at which the rule takes affect. Recognized forms include: .nf .in +.5i --- 162,168 ---- field. .TP .B AT ! Gives the time of day at which the rule takes effect. Recognized forms include: .nf .in +.5i *************** *** 291,294 **** /etc/zoneinfo standard directory used for created files .SH "SEE ALSO" newctime(3), tzfile(5), zdump(8) ! .. @(#)zic.8 3.1 --- 298,301 ---- /etc/zoneinfo standard directory used for created files .SH "SEE ALSO" newctime(3), tzfile(5), zdump(8) ! .. @(#)zic.8 3.4