1257 lines
33 KiB
C
1257 lines
33 KiB
C
/* Dump time zone data in a textual format. */
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/*
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** This file is in the public domain, so clarified as of
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** 2009-05-17 by Arthur David Olson.
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*/
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#include "version.h"
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#ifndef NETBSD_INSPIRED
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# define NETBSD_INSPIRED 1
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#endif
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#include "private.h"
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#include <stdio.h>
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#ifndef HAVE_SNPRINTF
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# define HAVE_SNPRINTF (199901 <= __STDC_VERSION__)
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#endif
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#ifndef HAVE_LOCALTIME_R
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# define HAVE_LOCALTIME_R 1
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#endif
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#ifndef HAVE_LOCALTIME_RZ
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# ifdef TM_ZONE
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# define HAVE_LOCALTIME_RZ (NETBSD_INSPIRED && USE_LTZ)
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# else
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# define HAVE_LOCALTIME_RZ 0
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# endif
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#endif
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#ifndef HAVE_TZSET
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# define HAVE_TZSET 1
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#endif
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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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#define SECSPERNYEAR (SECSPERDAY * DAYSPERNYEAR)
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#define SECSPERLYEAR (SECSPERNYEAR + SECSPERDAY)
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#define SECSPER400YEARS (SECSPERNYEAR * (intmax_t) (300 + 3) \
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+ SECSPERLYEAR * (intmax_t) (100 - 3))
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/*
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** True if SECSPER400YEARS is known to be representable as an
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** intmax_t. It's OK that SECSPER400YEARS_FITS can in theory be false
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** even if SECSPER400YEARS is representable, because when that happens
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** the code merely runs a bit more slowly, and this slowness doesn't
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** occur on any practical platform.
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*/
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enum { SECSPER400YEARS_FITS = SECSPERLYEAR <= INTMAX_MAX / 400 };
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#if HAVE_GETTEXT
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# include <locale.h> /* for setlocale */
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#endif /* HAVE_GETTEXT */
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#if ! HAVE_LOCALTIME_RZ
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# undef timezone_t
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# define timezone_t char **
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#endif
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#if !HAVE_POSIX_DECLS
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extern int getopt(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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#endif
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/* The minimum and maximum finite time values. */
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enum { atime_shift = CHAR_BIT * sizeof(time_t) - 2 };
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static time_t const absolute_min_time =
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((time_t) -1 < 0
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? (- ((time_t) ~ (time_t) 0 < 0)
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- (((time_t) 1 << atime_shift) - 1 + ((time_t) 1 << atime_shift)))
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: 0);
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static time_t const absolute_max_time =
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((time_t) -1 < 0
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? (((time_t) 1 << atime_shift) - 1 + ((time_t) 1 << atime_shift))
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: -1);
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static size_t longest;
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static char const *progname;
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static bool warned;
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static bool errout;
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static char const *abbr(struct tm const *);
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static intmax_t delta(struct tm *, struct tm *) ATTRIBUTE_REPRODUCIBLE;
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static void dumptime(struct tm const *);
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static time_t hunt(timezone_t, time_t, time_t, bool);
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static void show(timezone_t, char *, time_t, bool);
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static void showextrema(timezone_t, char *, time_t, struct tm *, time_t);
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static void showtrans(char const *, struct tm const *, time_t, char const *,
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char const *);
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static const char *tformat(void);
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static time_t yeartot(intmax_t) ATTRIBUTE_REPRODUCIBLE;
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/* Is C an ASCII digit? */
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static bool
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is_digit(char c)
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{
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return '0' <= c && c <= '9';
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}
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/* Is A an alphabetic character in the C locale? */
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static bool
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is_alpha(char a)
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{
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switch (a) {
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default:
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return false;
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case 'A': case 'B': case 'C': case 'D': case 'E': case 'F': case 'G':
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case 'H': case 'I': case 'J': case 'K': case 'L': case 'M': case 'N':
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case 'O': case 'P': case 'Q': case 'R': case 'S': case 'T': case 'U':
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case 'V': case 'W': case 'X': case 'Y': case 'Z':
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case 'a': case 'b': case 'c': case 'd': case 'e': case 'f': case 'g':
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case 'h': case 'i': case 'j': case 'k': case 'l': case 'm': case 'n':
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case 'o': case 'p': case 'q': case 'r': case 's': case 't': case 'u':
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case 'v': case 'w': case 'x': case 'y': case 'z':
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return true;
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}
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}
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static ATTRIBUTE_NORETURN void
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size_overflow(void)
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{
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fprintf(stderr, _("%s: size overflow\n"), progname);
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exit(EXIT_FAILURE);
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}
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/* Return A + B, exiting if the result would overflow either ptrdiff_t
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or size_t. */
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static ATTRIBUTE_REPRODUCIBLE size_t
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sumsize(size_t a, size_t b)
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{
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#ifdef ckd_add
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size_t sum;
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if (!ckd_add(&sum, a, b))
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return sum;
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#else
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if (a <= SIZE_MAX && b <= SIZE_MAX - a)
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return a + b;
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#endif
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size_overflow();
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}
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/* Return a pointer to a newly allocated buffer of size SIZE, exiting
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on failure. SIZE should be nonzero. */
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static void * ATTRIBUTE_MALLOC
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xmalloc(size_t size)
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{
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void *p = malloc(size);
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if (!p) {
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fprintf(stderr, _("%s: Memory exhausted\n"), progname);
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exit(EXIT_FAILURE);
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}
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return p;
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}
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#if ! HAVE_TZSET
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# undef tzset
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# define tzset zdump_tzset
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static void tzset(void) { }
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#endif
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/* Assume gmtime_r works if localtime_r does.
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A replacement localtime_r is defined below if needed. */
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#if ! HAVE_LOCALTIME_R
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# undef gmtime_r
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# define gmtime_r zdump_gmtime_r
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static struct tm *
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gmtime_r(time_t *tp, struct tm *tmp)
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{
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struct tm *r = gmtime(tp);
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if (r) {
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*tmp = *r;
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r = tmp;
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}
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return r;
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}
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#endif
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/* Platforms with TM_ZONE don't need tzname, so they can use the
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faster localtime_rz or localtime_r if available. */
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#if defined TM_ZONE && HAVE_LOCALTIME_RZ
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# define USE_LOCALTIME_RZ true
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#else
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# define USE_LOCALTIME_RZ false
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#endif
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#if ! USE_LOCALTIME_RZ
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# if !defined TM_ZONE || ! HAVE_LOCALTIME_R || ! HAVE_TZSET
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# undef localtime_r
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# define localtime_r zdump_localtime_r
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static struct tm *
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localtime_r(time_t *tp, struct tm *tmp)
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{
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struct tm *r = localtime(tp);
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if (r) {
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*tmp = *r;
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r = tmp;
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}
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return r;
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}
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# endif
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# undef localtime_rz
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# define localtime_rz zdump_localtime_rz
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static struct tm *
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localtime_rz(timezone_t rz __unused, time_t *tp, struct tm *tmp)
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{
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return localtime_r(tp, tmp);
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}
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# ifdef TYPECHECK
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# undef mktime_z
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# define mktime_z zdump_mktime_z
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static time_t
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mktime_z(timezone_t tz, struct tm *tmp)
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{
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return mktime(tmp);
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}
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# endif
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# undef tzalloc
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# undef tzfree
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# define tzalloc zdump_tzalloc
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# define tzfree zdump_tzfree
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static timezone_t
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tzalloc(char const *val)
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{
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# if HAVE_SETENV
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if (setenv("TZ", val, 1) != 0) {
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perror("setenv");
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exit(EXIT_FAILURE);
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}
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tzset();
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return &optarg; /* Any valid non-null char ** will do. */
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# else
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enum { TZeqlen = 3 };
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static char const TZeq[TZeqlen] = "TZ=";
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static char **fakeenv;
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static ptrdiff_t fakeenv0size;
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void *freeable = NULL;
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char **env = fakeenv, **initial_environ;
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size_t valsize = strlen(val) + 1;
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if (fakeenv0size < valsize) {
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char **e = environ, **to;
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ptrdiff_t initial_nenvptrs = 1; /* Counting the trailing NULL pointer. */
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while (*e++) {
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# ifdef ckd_add
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if (ckd_add(&initial_nenvptrs, initial_envptrs, 1)
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|| SIZE_MAX < initial_envptrs)
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size_overflow();
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# else
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if (initial_nenvptrs == min(PTRDIFF_MAX, SIZE_MAX) / sizeof *environ)
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size_overflow();
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initial_nenvptrs++;
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# endif
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}
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fakeenv0size = sumsize(valsize, valsize);
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fakeenv0size = max(fakeenv0size, 64);
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freeable = env;
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fakeenv = env =
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xmalloc(sumsize(sumsize(sizeof *environ,
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initial_nenvptrs * sizeof *environ),
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sumsize(TZeqlen, fakeenv0size)));
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to = env + 1;
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for (e = environ; (*to = *e); e++)
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to += strncmp(*e, TZeq, TZeqlen) != 0;
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env[0] = memcpy(to + 1, TZeq, TZeqlen);
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}
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memcpy(env[0] + TZeqlen, val, valsize);
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initial_environ = environ;
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environ = env;
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tzset();
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free(freeable);
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return initial_environ;
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# endif
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}
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static void
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tzfree(timezone_t initial_environ)
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{
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# if !HAVE_SETENV
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environ = initial_environ;
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tzset();
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# else
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(void)initial_environ;
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# endif
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}
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#endif /* ! USE_LOCALTIME_RZ */
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/* A UT time zone, and its initializer. */
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static timezone_t gmtz;
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static void
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gmtzinit(void)
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{
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if (USE_LOCALTIME_RZ) {
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/* Try "GMT" first to find out whether this is one of the rare
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platforms where time_t counts leap seconds; this works due to
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the "Zone GMT 0 - GMT" line in the "etcetera" file. If "GMT"
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fails, fall back on "GMT0" which might be similar due to the
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"Link GMT GMT0" line in the "backward" file, and which
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should work on all POSIX platforms. The rest of zdump does not
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use the "GMT" abbreviation that comes from this setting, so it
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is OK to use "GMT" here rather than the more-modern "UTC" which
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would not work on platforms that omit the "backward" file. */
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gmtz = tzalloc("GMT");
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if (!gmtz) {
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static char const gmt0[] = "GMT0";
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gmtz = tzalloc(gmt0);
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if (!gmtz) {
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perror(gmt0);
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exit(EXIT_FAILURE);
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}
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}
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}
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}
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/* Convert *TP to UT, storing the broken-down time into *TMP.
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Return TMP if successful, NULL otherwise. This is like gmtime_r(TP, TMP),
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except typically faster if USE_LOCALTIME_RZ. */
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static struct tm *
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my_gmtime_r(time_t *tp, struct tm *tmp)
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{
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return USE_LOCALTIME_RZ ? localtime_rz(gmtz, tp, tmp) : gmtime_r(tp, tmp);
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}
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#ifndef TYPECHECK
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# define my_localtime_rz localtime_rz
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#else /* !defined TYPECHECK */
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static struct tm *
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my_localtime_rz(timezone_t tz, time_t *tp, struct tm *tmp)
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{
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tmp = localtime_rz(tz, tp, tmp);
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if (tmp) {
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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_z(tz, &tm);
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if (t != *tp) {
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fflush(stdout);
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fprintf(stderr, "\n%s: ", progname);
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fprintf(stderr, tformat(), *tp);
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fprintf(stderr, " ->");
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fprintf(stderr, " year=%d", tmp->tm_year);
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fprintf(stderr, " mon=%d", tmp->tm_mon);
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fprintf(stderr, " mday=%d", tmp->tm_mday);
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fprintf(stderr, " hour=%d", tmp->tm_hour);
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fprintf(stderr, " min=%d", tmp->tm_min);
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fprintf(stderr, " sec=%d", tmp->tm_sec);
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fprintf(stderr, " isdst=%d", tmp->tm_isdst);
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fprintf(stderr, " -> ");
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fprintf(stderr, tformat(), t);
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fprintf(stderr, "\n");
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errout = true;
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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(const char *const abbrp, const char *const zone)
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{
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register const char * cp;
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register const char * wp;
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if (warned)
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return;
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cp = abbrp;
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while (is_alpha(*cp) || is_digit(*cp) || *cp == '-' || *cp == '+')
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++cp;
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if (*cp)
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wp = _("has characters other than ASCII alphanumerics, '-' or '+'");
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else if (cp - abbrp < 3)
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wp = _("has fewer than 3 characters");
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else if (cp - abbrp > 6)
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wp = _("has more than 6 characters");
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else
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return;
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fflush(stdout);
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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 = errout = true;
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}
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/* Return a time zone abbreviation. If the abbreviation needs to be
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saved, use *BUF (of size *BUFALLOC) to save it, and return the
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abbreviation in the possibly-reallocated *BUF. Otherwise, just
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return the abbreviation. Get the abbreviation from TMP.
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Exit on memory allocation failure. */
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static char const *
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saveabbr(char **buf, ptrdiff_t *bufalloc, struct tm const *tmp)
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{
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char const *ab = abbr(tmp);
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if (HAVE_LOCALTIME_RZ)
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return ab;
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else {
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size_t ablen = strlen(ab);
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if ((size_t)*bufalloc <= ablen) {
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free(*buf);
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|
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/* Make the new buffer at least twice as long as the old,
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to avoid O(N**2) behavior on repeated calls. */
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*bufalloc = sumsize(*bufalloc, ablen + 1);
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*buf = xmalloc(*bufalloc);
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}
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return strcpy(*buf, ab);
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}
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}
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|
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static void
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close_file(FILE *stream)
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{
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char const *e = (ferror(stream) ? _("I/O error")
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: fclose(stream) != 0 ? strerror(errno) : NULL);
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if (e) {
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fprintf(stderr, "%s: %s\n", progname, e);
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exit(EXIT_FAILURE);
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}
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}
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|
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static void
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usage(FILE * const stream, const int status)
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{
|
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fprintf(stream,
|
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_("%s: usage: %s OPTIONS TIMEZONE ...\n"
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|
"Options include:\n"
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" -c [L,]U Start at year L (default -500), end before year U (default 2500)\n"
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" -t [L,]U Start at time L, end before time U (in seconds since 1970)\n"
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" -i List transitions briefly (format is experimental)\n" \
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" -v List transitions verbosely\n"
|
|
" -V List transitions a bit less verbosely\n"
|
|
" --help Output this help\n"
|
|
" --version Output version info\n"
|
|
"\n"
|
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"Report bugs to %s.\n"),
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progname, progname, REPORT_BUGS_TO);
|
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if (status == EXIT_SUCCESS)
|
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close_file(stream);
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exit(status);
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}
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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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/* These are static so that they're initially zero. */
|
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static char * abbrev;
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static ptrdiff_t abbrevsize;
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|
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register int i;
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register bool vflag;
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register bool Vflag;
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register char * cutarg;
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register char * cuttimes;
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register time_t cutlotime;
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register time_t cuthitime;
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time_t now;
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bool iflag = false;
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cutlotime = absolute_min_time;
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cuthitime = absolute_max_time;
|
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#if HAVE_GETTEXT
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setlocale(LC_ALL, "");
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# ifdef TZ_DOMAINDIR
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bindtextdomain(TZ_DOMAIN, TZ_DOMAINDIR);
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# endif /* defined TEXTDOMAINDIR */
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textdomain(TZ_DOMAIN);
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#endif /* HAVE_GETTEXT */
|
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progname = argv[0] ? argv[0] : "zdump";
|
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for (i = 1; i < argc; ++i)
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if (strcmp(argv[i], "--version") == 0) {
|
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printf("zdump %s%s\n", PKGVERSION, TZVERSION);
|
|
return EXIT_SUCCESS;
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} else if (strcmp(argv[i], "--help") == 0) {
|
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usage(stdout, EXIT_SUCCESS);
|
|
}
|
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vflag = Vflag = false;
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cutarg = cuttimes = NULL;
|
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for (;;)
|
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switch (getopt(argc, argv, "c:it:vV")) {
|
|
case 'c': cutarg = optarg; break;
|
|
case 't': cuttimes = optarg; break;
|
|
case 'i': iflag = true; break;
|
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case 'v': vflag = true; break;
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|
case 'V': Vflag = true; break;
|
|
case -1:
|
|
if (! (optind == argc - 1 && strcmp(argv[optind], "=") == 0))
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goto arg_processing_done;
|
|
ATTRIBUTE_FALLTHROUGH;
|
|
default:
|
|
usage(stderr, EXIT_FAILURE);
|
|
}
|
|
arg_processing_done:;
|
|
|
|
if (iflag | vflag | Vflag) {
|
|
intmax_t lo;
|
|
intmax_t hi;
|
|
char *loend, *hiend;
|
|
register intmax_t cutloyear = ZDUMP_LO_YEAR;
|
|
register intmax_t cuthiyear = ZDUMP_HI_YEAR;
|
|
if (cutarg != NULL) {
|
|
lo = strtoimax(cutarg, &loend, 10);
|
|
if (cutarg != loend && !*loend) {
|
|
hi = lo;
|
|
cuthiyear = hi;
|
|
} else if (cutarg != loend && *loend == ','
|
|
&& (hi = strtoimax(loend + 1, &hiend, 10),
|
|
loend + 1 != hiend && !*hiend)) {
|
|
cutloyear = lo;
|
|
cuthiyear = hi;
|
|
} else {
|
|
fprintf(stderr, _("%s: wild -c argument %s\n"),
|
|
progname, cutarg);
|
|
return EXIT_FAILURE;
|
|
}
|
|
}
|
|
if (cutarg != NULL || cuttimes == NULL) {
|
|
cutlotime = yeartot(cutloyear);
|
|
cuthitime = yeartot(cuthiyear);
|
|
}
|
|
if (cuttimes != NULL) {
|
|
lo = strtoimax(cuttimes, &loend, 10);
|
|
if (cuttimes != loend && !*loend) {
|
|
hi = lo;
|
|
if (hi < cuthitime) {
|
|
if (hi < absolute_min_time + 1)
|
|
hi = absolute_min_time + 1;
|
|
cuthitime = hi;
|
|
}
|
|
} else if (cuttimes != loend && *loend == ','
|
|
&& (hi = strtoimax(loend + 1, &hiend, 10),
|
|
loend + 1 != hiend && !*hiend)) {
|
|
if (cutlotime < lo) {
|
|
if (absolute_max_time < lo)
|
|
lo = absolute_max_time;
|
|
cutlotime = lo;
|
|
}
|
|
if (hi < cuthitime) {
|
|
if (hi < absolute_min_time + 1)
|
|
hi = absolute_min_time + 1;
|
|
cuthitime = hi;
|
|
}
|
|
} else {
|
|
fprintf(stderr,
|
|
_("%s: wild -t argument %s\n"),
|
|
progname, cuttimes);
|
|
return EXIT_FAILURE;
|
|
}
|
|
}
|
|
}
|
|
gmtzinit();
|
|
if (iflag | vflag | Vflag)
|
|
now = 0;
|
|
else {
|
|
now = time(NULL);
|
|
now |= !now;
|
|
}
|
|
longest = 0;
|
|
for (i = optind; i < argc; i++) {
|
|
size_t arglen = strlen(argv[i]);
|
|
if (longest < arglen)
|
|
longest = min(arglen, INT_MAX);
|
|
}
|
|
|
|
for (i = optind; i < argc; ++i) {
|
|
timezone_t tz = tzalloc(argv[i]);
|
|
char const *ab;
|
|
time_t t;
|
|
struct tm tm, newtm;
|
|
bool tm_ok;
|
|
if (!tz) {
|
|
perror(argv[i]);
|
|
return EXIT_FAILURE;
|
|
}
|
|
if (now) {
|
|
show(tz, argv[i], now, false);
|
|
tzfree(tz);
|
|
continue;
|
|
}
|
|
warned = false;
|
|
t = absolute_min_time;
|
|
if (! (iflag | Vflag)) {
|
|
show(tz, argv[i], t, true);
|
|
if (my_localtime_rz(tz, &t, &tm) == NULL
|
|
&& t < cutlotime) {
|
|
time_t newt = cutlotime;
|
|
if (my_localtime_rz(tz, &newt, &newtm) != NULL)
|
|
showextrema(tz, argv[i], t, NULL, newt);
|
|
}
|
|
}
|
|
if (t + 1 < cutlotime)
|
|
t = cutlotime - 1;
|
|
tm_ok = my_localtime_rz(tz, &t, &tm) != NULL;
|
|
if (tm_ok) {
|
|
ab = saveabbr(&abbrev, &abbrevsize, &tm);
|
|
if (iflag) {
|
|
showtrans("\nTZ=%f", &tm, t, ab, argv[i]);
|
|
showtrans("-\t-\t%Q", &tm, t, ab, argv[i]);
|
|
}
|
|
} else
|
|
ab = NULL;
|
|
while (t < cuthitime - 1) {
|
|
time_t newt = ((t < absolute_max_time - SECSPERDAY / 2
|
|
&& t + SECSPERDAY / 2 < cuthitime - 1)
|
|
? t + SECSPERDAY / 2
|
|
: cuthitime - 1);
|
|
struct tm *newtmp = localtime_rz(tz, &newt, &newtm);
|
|
bool newtm_ok = newtmp != NULL;
|
|
if (tm_ok != newtm_ok
|
|
|| (ab && (delta(&newtm, &tm) != newt - t
|
|
|| newtm.tm_isdst != tm.tm_isdst
|
|
|| strcmp(abbr(&newtm), ab) != 0))) {
|
|
newt = hunt(tz, t, newt, false);
|
|
newtmp = localtime_rz(tz, &newt, &newtm);
|
|
newtm_ok = newtmp != NULL;
|
|
if (iflag)
|
|
showtrans("%Y-%m-%d\t%L\t%Q", newtmp, newt,
|
|
newtm_ok ? abbr(&newtm) : NULL, argv[i]);
|
|
else {
|
|
show(tz, argv[i], newt - 1, true);
|
|
show(tz, argv[i], newt, true);
|
|
}
|
|
}
|
|
t = newt;
|
|
tm_ok = newtm_ok;
|
|
if (newtm_ok) {
|
|
ab = saveabbr(&abbrev, &abbrevsize, &newtm);
|
|
tm = newtm;
|
|
}
|
|
}
|
|
if (! (iflag | Vflag)) {
|
|
time_t newt = absolute_max_time;
|
|
t = cuthitime;
|
|
if (t < newt) {
|
|
struct tm *tmp = my_localtime_rz(tz, &t, &tm);
|
|
if (tmp != NULL
|
|
&& my_localtime_rz(tz, &newt, &newtm) == NULL)
|
|
showextrema(tz, argv[i], t, tmp, newt);
|
|
}
|
|
show(tz, argv[i], absolute_max_time, true);
|
|
}
|
|
tzfree(tz);
|
|
}
|
|
close_file(stdout);
|
|
if (errout && (ferror(stderr) || fclose(stderr) != 0))
|
|
return EXIT_FAILURE;
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
static time_t
|
|
yeartot(intmax_t y)
|
|
{
|
|
register intmax_t myy, seconds, years;
|
|
register time_t t;
|
|
|
|
myy = EPOCH_YEAR;
|
|
t = 0;
|
|
while (myy < y) {
|
|
if (SECSPER400YEARS_FITS && 400 <= y - myy) {
|
|
intmax_t diff400 = (y - myy) / 400;
|
|
if (INTMAX_MAX / SECSPER400YEARS < diff400)
|
|
return absolute_max_time;
|
|
seconds = diff400 * SECSPER400YEARS;
|
|
years = diff400 * 400;
|
|
} else {
|
|
seconds = isleap(myy) ? SECSPERLYEAR : SECSPERNYEAR;
|
|
years = 1;
|
|
}
|
|
myy += years;
|
|
if (t > absolute_max_time - seconds)
|
|
return absolute_max_time;
|
|
t += seconds;
|
|
}
|
|
while (y < myy) {
|
|
if (SECSPER400YEARS_FITS && y + 400 <= myy && myy < 0) {
|
|
intmax_t diff400 = (myy - y) / 400;
|
|
if (INTMAX_MAX / SECSPER400YEARS < diff400)
|
|
return absolute_min_time;
|
|
seconds = diff400 * SECSPER400YEARS;
|
|
years = diff400 * 400;
|
|
} else {
|
|
seconds = isleap(myy - 1) ? SECSPERLYEAR : SECSPERNYEAR;
|
|
years = 1;
|
|
}
|
|
myy -= years;
|
|
if (t < absolute_min_time + seconds)
|
|
return absolute_min_time;
|
|
t -= seconds;
|
|
}
|
|
return t;
|
|
}
|
|
|
|
/* Search for a discontinuity in timezone TZ, in the
|
|
timestamps ranging from LOT through HIT. LOT and HIT disagree
|
|
about some aspect of timezone. If ONLY_OK, search only for
|
|
definedness changes, i.e., localtime succeeds on one side of the
|
|
transition but fails on the other side. Return the timestamp just
|
|
before the transition from LOT's settings. */
|
|
|
|
static time_t
|
|
hunt(timezone_t tz, time_t lot, time_t hit, bool only_ok)
|
|
{
|
|
static char * loab;
|
|
static ptrdiff_t loabsize;
|
|
struct tm lotm;
|
|
struct tm tm;
|
|
|
|
/* Convert LOT into a broken-down time here, even though our
|
|
caller already did that. On platforms without TM_ZONE,
|
|
tzname may have been altered since our caller broke down
|
|
LOT, and tzname needs to be changed back. */
|
|
bool lotm_ok = my_localtime_rz(tz, &lot, &lotm) != NULL;
|
|
bool tm_ok;
|
|
char const *ab = lotm_ok ? saveabbr(&loab, &loabsize, &lotm) : NULL;
|
|
|
|
for ( ; ; ) {
|
|
/* T = average of LOT and HIT, rounding down.
|
|
Avoid overflow, even on oddball C89 platforms
|
|
where / rounds down and TIME_T_MIN == -TIME_T_MAX
|
|
so lot / 2 + hit / 2 might overflow. */
|
|
time_t t = (lot / 2
|
|
- ((lot % 2 + hit % 2) < 0)
|
|
+ ((lot % 2 + hit % 2) == 2)
|
|
+ hit / 2);
|
|
if (t == lot)
|
|
break;
|
|
tm_ok = my_localtime_rz(tz, &t, &tm) != NULL;
|
|
if (lotm_ok == tm_ok
|
|
&& (only_ok
|
|
|| (ab && tm.tm_isdst == lotm.tm_isdst
|
|
&& delta(&tm, &lotm) == t - lot
|
|
&& strcmp(abbr(&tm), ab) == 0))) {
|
|
lot = t;
|
|
if (tm_ok)
|
|
lotm = tm;
|
|
} else hit = t;
|
|
}
|
|
return hit;
|
|
}
|
|
|
|
/*
|
|
** Thanks to Paul Eggert for logic used in delta_nonneg.
|
|
*/
|
|
|
|
static intmax_t
|
|
delta_nonneg(struct tm *newp, struct tm *oldp)
|
|
{
|
|
intmax_t oldy = oldp->tm_year;
|
|
int cycles = (newp->tm_year - oldy) / YEARSPERREPEAT;
|
|
intmax_t sec = SECSPERREPEAT, result = cycles * sec;
|
|
int tmy = oldp->tm_year + cycles * YEARSPERREPEAT;
|
|
for ( ; 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 intmax_t
|
|
delta(struct tm *newp, struct tm *oldp)
|
|
{
|
|
return (newp->tm_year < oldp->tm_year
|
|
? -delta_nonneg(oldp, newp)
|
|
: delta_nonneg(newp, oldp));
|
|
}
|
|
|
|
#ifndef TM_GMTOFF
|
|
/* Return A->tm_yday, adjusted to compare it fairly to B->tm_yday.
|
|
Assume A and B differ by at most one year. */
|
|
static int
|
|
adjusted_yday(struct tm const *a, struct tm const *b)
|
|
{
|
|
int yday = a->tm_yday;
|
|
if (b->tm_year < a->tm_year)
|
|
yday += 365 + isleap_sum(b->tm_year, TM_YEAR_BASE);
|
|
return yday;
|
|
}
|
|
#endif
|
|
|
|
/* If A is the broken-down local time and B the broken-down UT for
|
|
the same instant, return A's UT offset in seconds, where positive
|
|
offsets are east of Greenwich. On failure, return LONG_MIN.
|
|
|
|
If T is nonnull, *T is the timestamp that corresponds to A; call
|
|
my_gmtime_r and use its result instead of B. Otherwise, B is the
|
|
possibly nonnull result of an earlier call to my_gmtime_r. */
|
|
static long
|
|
gmtoff(struct tm const *a, ATTRIBUTE_MAYBE_UNUSED time_t *t,
|
|
ATTRIBUTE_MAYBE_UNUSED struct tm const *b)
|
|
{
|
|
#ifdef TM_GMTOFF
|
|
return a->TM_GMTOFF;
|
|
#else
|
|
struct tm tm;
|
|
if (t)
|
|
b = my_gmtime_r(t, &tm);
|
|
if (! b)
|
|
return LONG_MIN;
|
|
else {
|
|
int ayday = adjusted_yday(a, b);
|
|
int byday = adjusted_yday(b, a);
|
|
int days = ayday - byday;
|
|
long hours = a->tm_hour - b->tm_hour + 24 * days;
|
|
long minutes = a->tm_min - b->tm_min + 60 * hours;
|
|
long seconds = a->tm_sec - b->tm_sec + 60 * minutes;
|
|
return seconds;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static void
|
|
show(timezone_t tz, char *zone, time_t t, bool v)
|
|
{
|
|
register struct tm * tmp;
|
|
register struct tm * gmtmp;
|
|
struct tm tm, gmtm;
|
|
|
|
printf("%-*s ", (int)longest, zone);
|
|
if (v) {
|
|
gmtmp = my_gmtime_r(&t, &gmtm);
|
|
if (gmtmp == NULL) {
|
|
printf(tformat(), t);
|
|
printf(_(" (gmtime failed)"));
|
|
} else {
|
|
dumptime(gmtmp);
|
|
printf(" UT");
|
|
}
|
|
printf(" = ");
|
|
}
|
|
tmp = my_localtime_rz(tz, &t, &tm);
|
|
if (tmp == NULL) {
|
|
printf(tformat(), t);
|
|
printf(_(" (localtime failed)"));
|
|
} else {
|
|
dumptime(tmp);
|
|
if (*abbr(tmp) != '\0')
|
|
printf(" %s", abbr(tmp));
|
|
if (v) {
|
|
long off = gmtoff(tmp, NULL, gmtmp);
|
|
printf(" isdst=%d", tmp->tm_isdst);
|
|
if (off != LONG_MIN)
|
|
printf(" gmtoff=%ld", off);
|
|
}
|
|
}
|
|
printf("\n");
|
|
if (tmp != NULL && *abbr(tmp) != '\0')
|
|
abbrok(abbr(tmp), zone);
|
|
}
|
|
|
|
/* Show timestamps just before and just after a transition between
|
|
defined and undefined (or vice versa) in either localtime or
|
|
gmtime. These transitions are for timezone TZ with name ZONE, in
|
|
the range from LO (with broken-down time LOTMP if that is nonnull)
|
|
through HI. LO and HI disagree on definedness. */
|
|
|
|
static void
|
|
showextrema(timezone_t tz, char *zone, time_t lo, struct tm *lotmp, time_t hi)
|
|
{
|
|
struct tm localtm[2], gmtm[2];
|
|
time_t t, boundary = hunt(tz, lo, hi, true);
|
|
bool old = false;
|
|
hi = (SECSPERDAY < hi - boundary
|
|
? boundary + SECSPERDAY
|
|
: hi + (hi < TIME_T_MAX));
|
|
if (SECSPERDAY < boundary - lo) {
|
|
lo = boundary - SECSPERDAY;
|
|
lotmp = my_localtime_rz(tz, &lo, &localtm[old]);
|
|
}
|
|
if (lotmp)
|
|
localtm[old] = *lotmp;
|
|
else
|
|
localtm[old].tm_sec = -1;
|
|
if (! my_gmtime_r(&lo, &gmtm[old]))
|
|
gmtm[old].tm_sec = -1;
|
|
|
|
/* Search sequentially for definedness transitions. Although this
|
|
could be sped up by refining 'hunt' to search for either
|
|
localtime or gmtime definedness transitions, it hardly seems
|
|
worth the trouble. */
|
|
for (t = lo + 1; t < hi; t++) {
|
|
bool new = !old;
|
|
if (! my_localtime_rz(tz, &t, &localtm[new]))
|
|
localtm[new].tm_sec = -1;
|
|
if (! my_gmtime_r(&t, &gmtm[new]))
|
|
gmtm[new].tm_sec = -1;
|
|
if (((localtm[old].tm_sec < 0) != (localtm[new].tm_sec < 0))
|
|
| ((gmtm[old].tm_sec < 0) != (gmtm[new].tm_sec < 0))) {
|
|
show(tz, zone, t - 1, true);
|
|
show(tz, zone, t, true);
|
|
}
|
|
old = new;
|
|
}
|
|
}
|
|
|
|
#if HAVE_SNPRINTF
|
|
# define my_snprintf snprintf
|
|
#else
|
|
# include <stdarg.h>
|
|
|
|
/* A substitute for snprintf that is good enough for zdump. */
|
|
static int ATTRIBUTE_FORMAT((printf, 3, 4))
|
|
my_snprintf(char *s, size_t size, char const *format, ...)
|
|
{
|
|
int n;
|
|
va_list args;
|
|
char const *arg;
|
|
size_t arglen, slen;
|
|
char buf[1024];
|
|
va_start(args, format);
|
|
if (strcmp(format, "%s") == 0) {
|
|
arg = va_arg(args, char const *);
|
|
arglen = strlen(arg);
|
|
} else {
|
|
n = vsprintf(buf, format, args);
|
|
if (n < 0) {
|
|
va_end(args);
|
|
return n;
|
|
}
|
|
arg = buf;
|
|
arglen = n;
|
|
}
|
|
slen = arglen < size ? arglen : size - 1;
|
|
memcpy(s, arg, slen);
|
|
s[slen] = '\0';
|
|
n = arglen <= INT_MAX ? arglen : -1;
|
|
va_end(args);
|
|
return n;
|
|
}
|
|
#endif
|
|
|
|
/* Store into BUF, of size SIZE, a formatted local time taken from *TM.
|
|
Use ISO 8601 format +HH:MM:SS. Omit :SS if SS is zero, and omit
|
|
:MM too if MM is also zero.
|
|
|
|
Return the length of the resulting string. If the string does not
|
|
fit, return the length that the string would have been if it had
|
|
fit; do not overrun the output buffer. */
|
|
static int
|
|
format_local_time(char *buf, ptrdiff_t size, struct tm const *tm)
|
|
{
|
|
int ss = tm->tm_sec, mm = tm->tm_min, hh = tm->tm_hour;
|
|
return (ss
|
|
? my_snprintf(buf, size, "%02d:%02d:%02d", hh, mm, ss)
|
|
: mm
|
|
? my_snprintf(buf, size, "%02d:%02d", hh, mm)
|
|
: my_snprintf(buf, size, "%02d", hh));
|
|
}
|
|
|
|
/* Store into BUF, of size SIZE, a formatted UT offset for the
|
|
localtime *TM corresponding to time T. Use ISO 8601 format
|
|
+HHMMSS, or -HHMMSS for timestamps west of Greenwich; use the
|
|
format -00 for unknown UT offsets. If the hour needs more than
|
|
two digits to represent, extend the length of HH as needed.
|
|
Otherwise, omit SS if SS is zero, and omit MM too if MM is also
|
|
zero.
|
|
|
|
Return the length of the resulting string, or -1 if the result is
|
|
not representable as a string. If the string does not fit, return
|
|
the length that the string would have been if it had fit; do not
|
|
overrun the output buffer. */
|
|
static int
|
|
format_utc_offset(char *buf, ptrdiff_t size, struct tm const *tm, time_t t)
|
|
{
|
|
long off = gmtoff(tm, &t, NULL);
|
|
char sign = ((off < 0
|
|
|| (off == 0
|
|
&& (*abbr(tm) == '-' || strcmp(abbr(tm), "zzz") == 0)))
|
|
? '-' : '+');
|
|
long hh;
|
|
int mm, ss;
|
|
if (off < 0)
|
|
{
|
|
if (off == LONG_MIN)
|
|
return -1;
|
|
off = -off;
|
|
}
|
|
ss = off % 60;
|
|
mm = off / 60 % 60;
|
|
hh = off / 60 / 60;
|
|
return (ss || 100 <= hh
|
|
? my_snprintf(buf, size, "%c%02ld%02d%02d", sign, hh, mm, ss)
|
|
: mm
|
|
? my_snprintf(buf, size, "%c%02ld%02d", sign, hh, mm)
|
|
: my_snprintf(buf, size, "%c%02ld", sign, hh));
|
|
}
|
|
|
|
/* Store into BUF (of size SIZE) a quoted string representation of P.
|
|
If the representation's length is less than SIZE, return the
|
|
length; the representation is not null terminated. Otherwise
|
|
return SIZE, to indicate that BUF is too small. */
|
|
static ptrdiff_t
|
|
format_quoted_string(char *buf, ptrdiff_t size, char const *p)
|
|
{
|
|
char *b = buf;
|
|
ptrdiff_t s = size;
|
|
if (!s)
|
|
return size;
|
|
*b++ = '"', s--;
|
|
for (;;) {
|
|
char c = *p++;
|
|
if (s <= 1)
|
|
return size;
|
|
switch (c) {
|
|
default: *b++ = c, s--; continue;
|
|
case '\0': *b++ = '"', s--; return size - s;
|
|
case '"': case '\\': break;
|
|
case ' ': c = 's'; break;
|
|
case '\f': c = 'f'; break;
|
|
case '\n': c = 'n'; break;
|
|
case '\r': c = 'r'; break;
|
|
case '\t': c = 't'; break;
|
|
case '\v': c = 'v'; break;
|
|
}
|
|
*b++ = '\\', *b++ = c, s -= 2;
|
|
}
|
|
}
|
|
|
|
/* Store into BUF (of size SIZE) a timestamp formatted by TIME_FMT.
|
|
TM is the broken-down time, T the seconds count, AB the time zone
|
|
abbreviation, and ZONE_NAME the zone name. Return true if
|
|
successful, false if the output would require more than SIZE bytes.
|
|
TIME_FMT uses the same format that strftime uses, with these
|
|
additions:
|
|
|
|
%f zone name
|
|
%L local time as per format_local_time
|
|
%Q like "U\t%Z\tD" where U is the UT offset as for format_utc_offset
|
|
and D is the isdst flag; except omit D if it is zero, omit %Z if
|
|
it equals U, quote and escape %Z if it contains nonalphabetics,
|
|
and omit any trailing tabs. */
|
|
|
|
static bool
|
|
istrftime(char *buf, ptrdiff_t size, char const *time_fmt,
|
|
struct tm const *tm, time_t t, char const *ab, char const *zone_name)
|
|
{
|
|
char *b = buf;
|
|
ptrdiff_t s = size;
|
|
char const *f = time_fmt, *p;
|
|
|
|
for (p = f; ; p++)
|
|
if (*p == '%' && p[1] == '%')
|
|
p++;
|
|
else if (!*p
|
|
|| (*p == '%'
|
|
&& (p[1] == 'f' || p[1] == 'L' || p[1] == 'Q'))) {
|
|
ptrdiff_t formatted_len;
|
|
ptrdiff_t f_prefix_len = p - f;
|
|
ptrdiff_t f_prefix_copy_size = sumsize(f_prefix_len, 2);
|
|
char fbuf[100];
|
|
bool oversized = sizeof fbuf <= (size_t)f_prefix_copy_size;
|
|
char *f_prefix_copy = oversized ? xmalloc(f_prefix_copy_size) : fbuf;
|
|
memcpy(f_prefix_copy, f, f_prefix_len);
|
|
strcpy(f_prefix_copy + f_prefix_len, "X");
|
|
formatted_len = strftime(b, s, f_prefix_copy, tm);
|
|
if (oversized)
|
|
free(f_prefix_copy);
|
|
if (formatted_len == 0)
|
|
return false;
|
|
formatted_len--;
|
|
b += formatted_len, s -= formatted_len;
|
|
if (!*p++)
|
|
break;
|
|
switch (*p) {
|
|
case 'f':
|
|
formatted_len = format_quoted_string(b, s, zone_name);
|
|
break;
|
|
case 'L':
|
|
formatted_len = format_local_time(b, s, tm);
|
|
break;
|
|
case 'Q':
|
|
{
|
|
bool show_abbr;
|
|
int offlen = format_utc_offset(b, s, tm, t);
|
|
if (! (0 <= offlen && offlen < s))
|
|
return false;
|
|
show_abbr = strcmp(b, ab) != 0;
|
|
b += offlen, s -= offlen;
|
|
if (show_abbr) {
|
|
char const *abp;
|
|
ptrdiff_t len;
|
|
if (s <= 1)
|
|
return false;
|
|
*b++ = '\t', s--;
|
|
for (abp = ab; is_alpha(*abp); abp++)
|
|
continue;
|
|
len = (!*abp && *ab
|
|
? my_snprintf(b, s, "%s", ab)
|
|
: format_quoted_string(b, s, ab));
|
|
if (s <= len)
|
|
return false;
|
|
b += len, s -= len;
|
|
}
|
|
formatted_len
|
|
= (tm->tm_isdst
|
|
? my_snprintf(b, s, &"\t\t%d"[show_abbr], tm->tm_isdst)
|
|
: 0);
|
|
}
|
|
break;
|
|
}
|
|
if (s <= formatted_len)
|
|
return false;
|
|
b += formatted_len, s -= formatted_len;
|
|
f = p + 1;
|
|
}
|
|
*b = '\0';
|
|
return true;
|
|
}
|
|
|
|
/* Show a time transition. */
|
|
static void
|
|
showtrans(char const *time_fmt, struct tm const *tm, time_t t, char const *ab,
|
|
char const *zone_name)
|
|
{
|
|
if (!tm) {
|
|
printf(tformat(), t);
|
|
putchar('\n');
|
|
} else {
|
|
char stackbuf[1000];
|
|
ptrdiff_t size = sizeof stackbuf;
|
|
char *buf = stackbuf;
|
|
char *bufalloc = NULL;
|
|
while (! istrftime(buf, size, time_fmt, tm, t, ab, zone_name)) {
|
|
size = sumsize(size, size);
|
|
free(bufalloc);
|
|
buf = bufalloc = xmalloc(size);
|
|
}
|
|
puts(buf);
|
|
free(bufalloc);
|
|
}
|
|
}
|
|
|
|
static char const *
|
|
abbr(struct tm const *tmp)
|
|
{
|
|
#ifdef TM_ZONE
|
|
return tmp->TM_ZONE;
|
|
#else
|
|
# if HAVE_TZNAME
|
|
if (0 <= tmp->tm_isdst && tzname[0 < tmp->tm_isdst])
|
|
return tzname[0 < tmp->tm_isdst];
|
|
# endif
|
|
return "";
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
** The code below can fail on certain theoretical systems;
|
|
** it works on all known real-world systems as of 2022-01-25.
|
|
*/
|
|
|
|
static const char *
|
|
tformat(void)
|
|
{
|
|
#if HAVE_GENERIC
|
|
/* C11-style _Generic is more likely to return the correct
|
|
format when distinct types have the same size. */
|
|
char const *fmt =
|
|
_Generic(+ (time_t) 0,
|
|
int: "%d", long: "%ld", long long: "%lld",
|
|
unsigned: "%u", unsigned long: "%lu",
|
|
unsigned long long: "%llu",
|
|
default: NULL);
|
|
if (fmt)
|
|
return fmt;
|
|
fmt = _Generic((time_t) 0,
|
|
intmax_t: "%"PRIdMAX, uintmax_t: "%"PRIuMAX,
|
|
default: NULL);
|
|
if (fmt)
|
|
return fmt;
|
|
#endif
|
|
if (0 > (time_t) -1) { /* signed */
|
|
if (sizeof(time_t) == sizeof(intmax_t))
|
|
return "%"PRIdMAX;
|
|
if (sizeof(time_t) > sizeof(long))
|
|
return "%lld";
|
|
if (sizeof(time_t) > sizeof(int))
|
|
return "%ld";
|
|
return "%d";
|
|
}
|
|
#ifdef PRIuMAX
|
|
if (sizeof(time_t) == sizeof(uintmax_t))
|
|
return "%"PRIuMAX;
|
|
#endif
|
|
if (sizeof(time_t) > sizeof(unsigned long))
|
|
return "%llu";
|
|
if (sizeof(time_t) > sizeof(unsigned int))
|
|
return "%lu";
|
|
return "%u";
|
|
}
|
|
|
|
static void
|
|
dumptime(register const struct tm *timeptr)
|
|
{
|
|
static const char wday_name[][4] = {
|
|
"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
|
|
};
|
|
static const char mon_name[][4] = {
|
|
"Jan", "Feb", "Mar", "Apr", "May", "Jun",
|
|
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
|
|
};
|
|
register int lead;
|
|
register int trail;
|
|
int DIVISOR = 10;
|
|
|
|
/*
|
|
** The packaged localtime_rz and gmtime_r 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.
|
|
*/
|
|
printf("%s %s%3d %.2d:%.2d:%.2d ",
|
|
((0 <= timeptr->tm_wday
|
|
&& timeptr->tm_wday < (int)(sizeof wday_name / sizeof wday_name[0]))
|
|
? wday_name[timeptr->tm_wday] : "???"),
|
|
((0 <= timeptr->tm_mon
|
|
&& timeptr->tm_mon < (int)(sizeof mon_name / sizeof mon_name[0]))
|
|
? mon_name[timeptr->tm_mon] : "???"),
|
|
timeptr->tm_mday, timeptr->tm_hour,
|
|
timeptr->tm_min, timeptr->tm_sec);
|
|
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)
|
|
printf("%d", trail);
|
|
else printf("%d%d", lead, ((trail < 0) ? -trail : trail));
|
|
}
|