688 lines
16 KiB
C
688 lines
16 KiB
C
static char elsieid[] = "@(#)zdump.c 7.77";
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/*
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** This code has been made independent of the rest of the time
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** conversion package to increase confidence in the verification it provides.
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** You can use this code to help in verifying other implementations.
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*/
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#include "stdio.h" /* for stdout, stderr, perror */
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#include "string.h" /* for strcpy */
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#include "sys/types.h" /* for time_t */
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#include "time.h" /* for struct tm */
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#include "stdlib.h" /* for exit, malloc, atoi */
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#include "float.h" /* for FLT_MAX and DBL_MAX */
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#include "ctype.h" /* for isalpha et al. */
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#ifndef isascii
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#define isascii(x) 1
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#endif /* !defined isascii */
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#ifndef ZDUMP_LO_YEAR
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#define ZDUMP_LO_YEAR (-500)
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#endif /* !defined ZDUMP_LO_YEAR */
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#ifndef ZDUMP_HI_YEAR
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#define ZDUMP_HI_YEAR 2500
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#endif /* !defined ZDUMP_HI_YEAR */
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#ifndef MAX_STRING_LENGTH
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#define MAX_STRING_LENGTH 1024
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#endif /* !defined MAX_STRING_LENGTH */
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#ifndef TRUE
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#define TRUE 1
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#endif /* !defined TRUE */
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#ifndef FALSE
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#define FALSE 0
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#endif /* !defined FALSE */
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#ifndef EXIT_SUCCESS
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#define EXIT_SUCCESS 0
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#endif /* !defined EXIT_SUCCESS */
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#ifndef EXIT_FAILURE
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#define EXIT_FAILURE 1
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#endif /* !defined EXIT_FAILURE */
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#ifndef SECSPERMIN
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#define SECSPERMIN 60
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#endif /* !defined SECSPERMIN */
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#ifndef MINSPERHOUR
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#define MINSPERHOUR 60
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#endif /* !defined MINSPERHOUR */
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#ifndef SECSPERHOUR
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#define SECSPERHOUR (SECSPERMIN * MINSPERHOUR)
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#endif /* !defined SECSPERHOUR */
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#ifndef HOURSPERDAY
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#define HOURSPERDAY 24
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#endif /* !defined HOURSPERDAY */
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#ifndef EPOCH_YEAR
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#define EPOCH_YEAR 1970
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#endif /* !defined EPOCH_YEAR */
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#ifndef TM_YEAR_BASE
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#define TM_YEAR_BASE 1900
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#endif /* !defined TM_YEAR_BASE */
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#ifndef DAYSPERNYEAR
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#define DAYSPERNYEAR 365
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#endif /* !defined DAYSPERNYEAR */
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#ifndef isleap
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#define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
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#endif /* !defined isleap */
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#ifndef isleap_sum
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/*
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** See tzfile.h for details on isleap_sum.
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*/
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#define isleap_sum(a, b) isleap((a) % 400 + (b) % 400)
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#endif /* !defined isleap_sum */
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#define SECSPERDAY ((long) SECSPERHOUR * HOURSPERDAY)
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#define SECSPERNYEAR (SECSPERDAY * DAYSPERNYEAR)
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#define SECSPERLYEAR (SECSPERNYEAR + SECSPERDAY)
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#if HAVE_GETTEXT
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#include "locale.h" /* for setlocale */
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#include "libintl.h"
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#endif /* HAVE_GETTEXT */
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#ifndef GNUC_or_lint
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#ifdef lint
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#define GNUC_or_lint
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#else /* !defined lint */
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#ifdef __GNUC__
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#define GNUC_or_lint
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#endif /* defined __GNUC__ */
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#endif /* !defined lint */
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#endif /* !defined GNUC_or_lint */
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#ifndef INITIALIZE
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#ifdef GNUC_or_lint
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#define INITIALIZE(x) ((x) = 0)
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#else /* !defined GNUC_or_lint */
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#define INITIALIZE(x)
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#endif /* !defined GNUC_or_lint */
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#endif /* !defined INITIALIZE */
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/*
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** For the benefit of GNU folk...
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** `_(MSGID)' uses the current locale's message library string for MSGID.
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** The default is to use gettext if available, and use MSGID otherwise.
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*/
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#ifndef _
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#if HAVE_GETTEXT
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#define _(msgid) gettext(msgid)
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#else /* !HAVE_GETTEXT */
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#define _(msgid) msgid
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#endif /* !HAVE_GETTEXT */
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#endif /* !defined _ */
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#ifndef TZ_DOMAIN
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#define TZ_DOMAIN "tz"
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#endif /* !defined TZ_DOMAIN */
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#ifndef P
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#if __STDC__
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#define P(x) x
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#else /* !__STDC__ */
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#define P(x) ()
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#endif /* !__STDC__ */
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#endif /* !defined P */
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extern char ** environ;
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extern int getopt P((int argc, char * const argv[],
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const char * options));
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extern char * optarg;
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extern int optind;
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extern char * tzname[2];
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static time_t absolute_min_time;
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static time_t absolute_max_time;
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static size_t longest;
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static char * progname;
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static int warned;
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static char * abbr P((struct tm * tmp));
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static void abbrok P((const char * abbrp, const char * zone));
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static long delta P((struct tm * newp, struct tm * oldp));
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static void dumptime P((const struct tm * tmp));
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static time_t hunt P((char * name, time_t lot, time_t hit));
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static void setabsolutes P((void));
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static void show P((char * zone, time_t t, int v));
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static const char * tformat P((void));
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static time_t yeartot P((long y));
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#ifndef TYPECHECK
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#define my_localtime localtime
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#else /* !defined TYPECHECK */
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static struct tm *
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my_localtime(tp)
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time_t * tp;
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{
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register struct tm * tmp;
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tmp = localtime(tp);
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if (tp != NULL && tmp != NULL) {
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struct tm tm;
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register time_t t;
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tm = *tmp;
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t = mktime(&tm);
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if (t - *tp >= 1 || *tp - t >= 1) {
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(void) fflush(stdout);
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(void) fprintf(stderr, "\n%s: ", progname);
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(void) fprintf(stderr, tformat(), *tp);
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(void) fprintf(stderr, " ->");
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(void) fprintf(stderr, " year=%d", tmp->tm_year);
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(void) fprintf(stderr, " mon=%d", tmp->tm_mon);
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(void) fprintf(stderr, " mday=%d", tmp->tm_mday);
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(void) fprintf(stderr, " hour=%d", tmp->tm_hour);
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(void) fprintf(stderr, " min=%d", tmp->tm_min);
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(void) fprintf(stderr, " sec=%d", tmp->tm_sec);
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(void) fprintf(stderr, " isdst=%d", tmp->tm_isdst);
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(void) fprintf(stderr, " -> ");
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(void) fprintf(stderr, tformat(), t);
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(void) fprintf(stderr, "\n");
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}
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}
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return tmp;
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}
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#endif /* !defined TYPECHECK */
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static void
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abbrok(abbrp, zone)
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const char * const abbrp;
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const char * const zone;
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{
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register const char * cp;
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register char * wp;
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if (warned)
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return;
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cp = abbrp;
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wp = NULL;
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while (isascii((unsigned char) *cp) && isalpha((unsigned char) *cp))
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++cp;
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if (cp - abbrp == 0)
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wp = _("lacks alphabetic at start");
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else if (cp - abbrp < 3)
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wp = _("has fewer than 3 alphabetics");
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else if (cp - abbrp > 6)
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wp = _("has more than 6 alphabetics");
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if (wp == NULL && (*cp == '+' || *cp == '-')) {
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++cp;
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if (isascii((unsigned char) *cp) &&
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isdigit((unsigned char) *cp))
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if (*cp++ == '1' && *cp >= '0' && *cp <= '4')
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++cp;
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if (*cp != '\0')
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wp = _("differs from POSIX standard");
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}
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if (wp == NULL)
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return;
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(void) fflush(stdout);
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(void) fprintf(stderr,
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_("%s: warning: zone \"%s\" abbreviation \"%s\" %s\n"),
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progname, zone, abbrp, wp);
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warned = TRUE;
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}
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int
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main( int argc, char * argv[])
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{
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register int i;
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register int c;
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register int vflag;
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register char * cutarg;
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register long cutloyear = ZDUMP_LO_YEAR;
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register long cuthiyear = ZDUMP_HI_YEAR;
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register time_t cutlotime;
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register time_t cuthitime;
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register char ** fakeenv;
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time_t now;
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time_t t;
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time_t newt;
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struct tm tm;
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struct tm newtm;
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register struct tm * tmp;
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register struct tm * newtmp;
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INITIALIZE(cutlotime);
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INITIALIZE(cuthitime);
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#if HAVE_GETTEXT
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(void) setlocale(LC_ALL, "");
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#ifdef TZ_DOMAINDIR
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(void) bindtextdomain(TZ_DOMAIN, TZ_DOMAINDIR);
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#endif /* defined TEXTDOMAINDIR */
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(void) textdomain(TZ_DOMAIN);
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#endif /* HAVE_GETTEXT */
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progname = argv[0];
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for (i = 1; i < argc; ++i)
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if (strcmp(argv[i], "--version") == 0) {
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(void) printf("%s\n", elsieid);
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exit(EXIT_SUCCESS);
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}
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vflag = 0;
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cutarg = NULL;
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while ((c = getopt(argc, argv, "c:v")) == 'c' || c == 'v')
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if (c == 'v')
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vflag = 1;
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else cutarg = optarg;
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if ((c != EOF && c != -1) ||
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(optind == argc - 1 && strcmp(argv[optind], "=") == 0)) {
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(void) fprintf(stderr,
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_("%s: usage is %s [ --version ] [ -v ] [ -c [loyear,]hiyear ] zonename ...\n"),
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progname, progname);
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exit(EXIT_FAILURE);
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}
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if (vflag) {
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if (cutarg != NULL) {
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long lo;
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long hi;
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char dummy;
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if (sscanf(cutarg, "%ld%c", &hi, &dummy) == 1) {
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cuthiyear = hi;
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} else if (sscanf(cutarg, "%ld,%ld%c",
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&lo, &hi, &dummy) == 2) {
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cutloyear = lo;
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cuthiyear = hi;
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} else {
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(void) fprintf(stderr, _("%s: wild -c argument %s\n"),
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progname, cutarg);
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exit(EXIT_FAILURE);
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}
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}
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setabsolutes();
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cutlotime = yeartot(cutloyear);
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cuthitime = yeartot(cuthiyear);
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}
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(void) time(&now);
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longest = 0;
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for (i = optind; i < argc; ++i)
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if (strlen(argv[i]) > longest)
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longest = strlen(argv[i]);
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{
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register int from;
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register int to;
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for (i = 0; environ[i] != NULL; ++i)
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continue;
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fakeenv = (char **) malloc((size_t) ((i + 2) *
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sizeof *fakeenv));
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if (fakeenv == NULL ||
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(fakeenv[0] = (char *) malloc(longest + 4)) == NULL) {
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(void) perror(progname);
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exit(EXIT_FAILURE);
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}
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to = 0;
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(void) strcpy(fakeenv[to++], "TZ=");
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for (from = 0; environ[from] != NULL; ++from)
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if (strncmp(environ[from], "TZ=", 3) != 0)
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fakeenv[to++] = environ[from];
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fakeenv[to] = NULL;
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environ = fakeenv;
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}
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for (i = optind; i < argc; ++i) {
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static char buf[MAX_STRING_LENGTH];
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(void) strcpy(&fakeenv[0][3], argv[i]);
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if (!vflag) {
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show(argv[i], now, FALSE);
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continue;
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}
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warned = FALSE;
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t = absolute_min_time;
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show(argv[i], t, TRUE);
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t += SECSPERHOUR * HOURSPERDAY;
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show(argv[i], t, TRUE);
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if (t < cutlotime)
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t = cutlotime;
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tmp = my_localtime(&t);
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if (tmp != NULL) {
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tm = *tmp;
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(void) strncpy(buf, abbr(&tm), (sizeof buf) - 1);
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}
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for ( ; ; ) {
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if (t >= cuthitime)
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break;
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newt = t + SECSPERHOUR * 12;
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if (newt >= cuthitime)
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break;
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if (newt <= t)
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break;
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newtmp = localtime(&newt);
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if (newtmp != NULL)
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newtm = *newtmp;
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if ((tmp == NULL || newtmp == NULL) ? (tmp != newtmp) :
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(delta(&newtm, &tm) != (newt - t) ||
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newtm.tm_isdst != tm.tm_isdst ||
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strcmp(abbr(&newtm), buf) != 0)) {
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newt = hunt(argv[i], t, newt);
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newtmp = localtime(&newt);
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if (newtmp != NULL) {
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newtm = *newtmp;
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(void) strncpy(buf,
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abbr(&newtm),
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(sizeof buf) - 1);
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}
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}
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t = newt;
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tm = newtm;
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tmp = newtmp;
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}
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t = absolute_max_time;
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t -= SECSPERHOUR * HOURSPERDAY;
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show(argv[i], t, TRUE);
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t += SECSPERHOUR * HOURSPERDAY;
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show(argv[i], t, TRUE);
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}
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if (fflush(stdout) || ferror(stdout)) {
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(void) fprintf(stderr, "%s: ", progname);
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(void) perror(_("Error writing standard output"));
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exit(EXIT_FAILURE);
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}
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exit(EXIT_SUCCESS);
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/* If exit fails to exit... */
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return EXIT_FAILURE;
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}
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static void
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setabsolutes()
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{
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#if 0
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if (0.5 == (time_t) 0.5) {
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/*
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** time_t is floating.
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*/
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if (sizeof (time_t) == sizeof (float)) {
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absolute_min_time = (time_t) -FLT_MAX;
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absolute_max_time = (time_t) FLT_MAX;
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} else if (sizeof (time_t) == sizeof (double)) {
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absolute_min_time = (time_t) -DBL_MAX;
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absolute_max_time = (time_t) DBL_MAX;
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} else {
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(void) fprintf(stderr,
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_("%s: use of -v on system with floating time_t other than float or double\n"),
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progname);
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exit(EXIT_FAILURE);
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}
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} else
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#endif
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if (0 > (time_t) -1) {
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/*
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** time_t is signed. Assume overflow wraps around.
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*/
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time_t t = 0;
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time_t t1 = 1;
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while (t < t1) {
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t = t1;
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t1 = 2 * t1 + 1;
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}
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absolute_max_time = t;
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t = -t;
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absolute_min_time = t - 1;
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if (t < absolute_min_time)
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absolute_min_time = t;
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} else {
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/*
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** time_t is unsigned.
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*/
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absolute_min_time = 0;
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absolute_max_time = absolute_min_time - 1;
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}
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}
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static time_t
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yeartot(y)
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const long y;
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{
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register long myy;
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register long seconds;
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register time_t t;
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myy = EPOCH_YEAR;
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t = 0;
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while (myy != y) {
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if (myy < y) {
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seconds = isleap(myy) ? SECSPERLYEAR : SECSPERNYEAR;
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++myy;
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if (t > absolute_max_time - seconds) {
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t = absolute_max_time;
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break;
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}
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t += seconds;
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} else {
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--myy;
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seconds = isleap(myy) ? SECSPERLYEAR : SECSPERNYEAR;
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if (t < absolute_min_time + seconds) {
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t = absolute_min_time;
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break;
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}
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t -= seconds;
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}
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}
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return t;
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}
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static time_t
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#if __STDC__
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hunt(char *name, time_t lot, time_t hit)
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#else /* !__STDC__ */
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hunt(name, lot, hit)
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char * name;
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time_t lot;
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time_t hit;
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#endif /* !__STDC__ */
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{
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time_t t;
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long diff;
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struct tm lotm;
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register struct tm * lotmp;
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struct tm tm;
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register struct tm * tmp;
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char loab[MAX_STRING_LENGTH];
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lotmp = my_localtime(&lot);
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if (lotmp != NULL) {
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lotm = *lotmp;
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(void) strncpy(loab, abbr(&lotm), (sizeof loab) - 1);
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}
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for ( ; ; ) {
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diff = (long) (hit - lot);
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if (diff < 2)
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break;
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t = lot;
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t += diff / 2;
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if (t <= lot)
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++t;
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else if (t >= hit)
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--t;
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tmp = my_localtime(&t);
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if (tmp != NULL)
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tm = *tmp;
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if ((lotmp == NULL || tmp == NULL) ? (lotmp == tmp) :
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(delta(&tm, &lotm) == (t - lot) &&
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tm.tm_isdst == lotm.tm_isdst &&
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strcmp(abbr(&tm), loab) == 0)) {
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lot = t;
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lotm = tm;
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lotmp = tmp;
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} else hit = t;
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}
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show(name, lot, TRUE);
|
|
show(name, hit, TRUE);
|
|
return hit;
|
|
}
|
|
|
|
/*
|
|
** Thanks to Paul Eggert for logic used in delta.
|
|
*/
|
|
|
|
static long
|
|
delta(newp, oldp)
|
|
struct tm * newp;
|
|
struct tm * oldp;
|
|
{
|
|
register long result;
|
|
register int tmy;
|
|
|
|
if (newp->tm_year < oldp->tm_year)
|
|
return -delta(oldp, newp);
|
|
result = 0;
|
|
for (tmy = oldp->tm_year; tmy < newp->tm_year; ++tmy)
|
|
result += DAYSPERNYEAR + isleap_sum(tmy, TM_YEAR_BASE);
|
|
result += newp->tm_yday - oldp->tm_yday;
|
|
result *= HOURSPERDAY;
|
|
result += newp->tm_hour - oldp->tm_hour;
|
|
result *= MINSPERHOUR;
|
|
result += newp->tm_min - oldp->tm_min;
|
|
result *= SECSPERMIN;
|
|
result += newp->tm_sec - oldp->tm_sec;
|
|
return result;
|
|
}
|
|
|
|
static void
|
|
#if __STDC__
|
|
show(char *zone, time_t t, int v)
|
|
#else /* !__STDC__ */
|
|
show(zone, t, v)
|
|
char * zone;
|
|
time_t t;
|
|
int v;
|
|
#endif /* !__STDC__ */
|
|
{
|
|
register struct tm * tmp;
|
|
|
|
(void) printf("%-*s ", (int) longest, zone);
|
|
if (v) {
|
|
tmp = gmtime(&t);
|
|
if (tmp == NULL) {
|
|
(void) printf(tformat(), t);
|
|
} else {
|
|
dumptime(tmp);
|
|
(void) printf(" UTC");
|
|
}
|
|
(void) printf(" = ");
|
|
}
|
|
tmp = my_localtime(&t);
|
|
dumptime(tmp);
|
|
if (tmp != NULL) {
|
|
if (*abbr(tmp) != '\0')
|
|
(void) printf(" %s", abbr(tmp));
|
|
if (v) {
|
|
(void) printf(" isdst=%d", tmp->tm_isdst);
|
|
#ifdef TM_GMTOFF
|
|
(void) printf(" gmtoff=%ld", tmp->TM_GMTOFF);
|
|
#endif /* defined TM_GMTOFF */
|
|
}
|
|
}
|
|
(void) printf("\n");
|
|
if (tmp != NULL && *abbr(tmp) != '\0')
|
|
abbrok(abbr(tmp), zone);
|
|
}
|
|
|
|
static char *
|
|
abbr(tmp)
|
|
struct tm * tmp;
|
|
{
|
|
register char * result;
|
|
static char nada;
|
|
|
|
if (tmp->tm_isdst != 0 && tmp->tm_isdst != 1)
|
|
return &nada;
|
|
result = tzname[tmp->tm_isdst];
|
|
return (result == NULL) ? &nada : result;
|
|
}
|
|
|
|
/*
|
|
** The code below can fail on certain theoretical systems;
|
|
** it works on all known real-world systems as of 2004-12-30.
|
|
*/
|
|
|
|
static const char *
|
|
tformat()
|
|
{
|
|
if (0.5 == (time_t) 0.5) { /* floating */
|
|
if (sizeof (time_t) > sizeof (double))
|
|
return "%Lg";
|
|
return "%g";
|
|
}
|
|
if (0 > (time_t) -1) { /* signed */
|
|
if (sizeof (time_t) > sizeof (long))
|
|
return "%lld";
|
|
if (sizeof (time_t) > sizeof (int))
|
|
return "%ld";
|
|
return "%d";
|
|
}
|
|
if (sizeof (time_t) > sizeof (unsigned long))
|
|
return "%llu";
|
|
if (sizeof (time_t) > sizeof (unsigned int))
|
|
return "%lu";
|
|
return "%u";
|
|
}
|
|
|
|
static void
|
|
dumptime(timeptr)
|
|
register const struct tm * timeptr;
|
|
{
|
|
static const char wday_name[][3] = {
|
|
"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
|
|
};
|
|
static const char mon_name[][3] = {
|
|
"Jan", "Feb", "Mar", "Apr", "May", "Jun",
|
|
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
|
|
};
|
|
register const char * wn;
|
|
register const char * mn;
|
|
register int lead;
|
|
register int trail;
|
|
|
|
if (timeptr == NULL) {
|
|
(void) printf("NULL");
|
|
return;
|
|
}
|
|
/*
|
|
** The packaged versions of localtime and gmtime never put out-of-range
|
|
** values in tm_wday or tm_mon, but since this code might be compiled
|
|
** with other (perhaps experimental) versions, paranoia is in order.
|
|
*/
|
|
if (timeptr->tm_wday < 0 || timeptr->tm_wday >=
|
|
(int) (sizeof wday_name / sizeof wday_name[0]))
|
|
wn = "???";
|
|
else wn = wday_name[timeptr->tm_wday];
|
|
if (timeptr->tm_mon < 0 || timeptr->tm_mon >=
|
|
(int) (sizeof mon_name / sizeof mon_name[0]))
|
|
mn = "???";
|
|
else mn = mon_name[timeptr->tm_mon];
|
|
(void) printf("%.3s %.3s%3d %.2d:%.2d:%.2d ",
|
|
wn, mn,
|
|
timeptr->tm_mday, timeptr->tm_hour,
|
|
timeptr->tm_min, timeptr->tm_sec);
|
|
#define DIVISOR 10
|
|
trail = timeptr->tm_year % DIVISOR + TM_YEAR_BASE % DIVISOR;
|
|
lead = timeptr->tm_year / DIVISOR + TM_YEAR_BASE / DIVISOR +
|
|
trail / DIVISOR;
|
|
trail %= DIVISOR;
|
|
if (trail < 0 && lead > 0) {
|
|
trail += DIVISOR;
|
|
--lead;
|
|
} else if (lead < 0 && trail > 0) {
|
|
trail -= DIVISOR;
|
|
++lead;
|
|
}
|
|
if (lead == 0)
|
|
(void) printf("%d", trail);
|
|
else (void) printf("%d%d", lead, ((trail < 0) ? -trail : trail));
|
|
}
|