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/*
** This file is in the public domain, so clarified as of
** 2009-05-17 by Arthur David Olson.
*/
#include "version.h"
/*
** This code has been made independent of the rest of the time
** conversion package to increase confidence in the verification it provides.
** You can use this code to help in verifying other implementations.
** To do this, compile with -DUSE_LTZ=0 and link without the tz library.
*/
#ifndef NETBSD_INSPIRED
# define NETBSD_INSPIRED 1
#endif
#ifndef USE_LTZ
# define USE_LTZ 1
#endif
#if USE_LTZ
# include "private.h"
#endif
/* Enable tm_gmtoff and tm_zone on GNUish systems. */
#define _GNU_SOURCE 1
/* Enable strtoimax on Solaris 10. */
#define __EXTENSIONS__ 1
#include "stdio.h" /* for stdout, stderr, perror */
#include "string.h" /* for strcpy */
#include "sys/types.h" /* for time_t */
#include "time.h" /* for struct tm */
#include "stdlib.h" /* for exit, malloc, atoi */
#include "limits.h" /* for CHAR_BIT, LLONG_MAX */
#include <errno.h>
/*
** Substitutes for pre-C99 compilers.
** Much of this section of code is stolen from private.h.
*/
#ifndef HAVE_STDINT_H
# define HAVE_STDINT_H \
(199901 <= __STDC_VERSION__ \
|| 2 < __GLIBC__ + (1 <= __GLIBC_MINOR__) \
|| __CYGWIN__)
#endif
#if HAVE_STDINT_H
# include "stdint.h"
#endif
#ifndef HAVE_INTTYPES_H
# define HAVE_INTTYPES_H HAVE_STDINT_H
#endif
#if HAVE_INTTYPES_H
# include <inttypes.h>
#endif
#ifndef INT_FAST32_MAX
# if INT_MAX >> 31 == 0
typedef long int_fast32_t;
# else
typedef int int_fast32_t;
# endif
#endif
/* Pre-C99 GCC compilers define __LONG_LONG_MAX__ instead of LLONG_MAX. */
#if !defined LLONG_MAX && defined __LONG_LONG_MAX__
# define LLONG_MAX __LONG_LONG_MAX__
#endif
#ifndef INTMAX_MAX
# ifdef LLONG_MAX
typedef long long intmax_t;
# define strtoimax strtoll
# define INTMAX_MAX LLONG_MAX
# else
typedef long intmax_t;
# define strtoimax strtol
# define INTMAX_MAX LONG_MAX
# endif
#endif
#ifndef PRIdMAX
# if INTMAX_MAX == LLONG_MAX
# define PRIdMAX "lld"
# else
# define PRIdMAX "ld"
# endif
#endif
/* Infer TM_ZONE on systems where this information is known, but suppress
guessing if NO_TM_ZONE is defined. Similarly for TM_GMTOFF. */
#if (defined __GLIBC__ \
|| defined __FreeBSD__ || defined __NetBSD__ || defined __OpenBSD__ \
|| (defined __APPLE__ && defined __MACH__))
# if !defined TM_GMTOFF && !defined NO_TM_GMTOFF
# define TM_GMTOFF tm_gmtoff
# endif
# if !defined TM_ZONE && !defined NO_TM_ZONE
# define TM_ZONE tm_zone
# endif
#endif
#ifndef HAVE_LOCALTIME_R
# define HAVE_LOCALTIME_R 1
#endif
#ifndef HAVE_LOCALTIME_RZ
# ifdef TM_ZONE
# define HAVE_LOCALTIME_RZ (NETBSD_INSPIRED && USE_LTZ)
# else
# define HAVE_LOCALTIME_RZ 0
# endif
#endif
#ifndef HAVE_TZSET
# define HAVE_TZSET 1
#endif
#ifndef ZDUMP_LO_YEAR
#define ZDUMP_LO_YEAR (-500)
#endif /* !defined ZDUMP_LO_YEAR */
#ifndef ZDUMP_HI_YEAR
#define ZDUMP_HI_YEAR 2500
#endif /* !defined ZDUMP_HI_YEAR */
#ifndef MAX_STRING_LENGTH
#define MAX_STRING_LENGTH 1024
#endif /* !defined MAX_STRING_LENGTH */
#if __STDC_VERSION__ < 199901
# define true 1
# define false 0
# define bool int
#else
# include <stdbool.h>
#endif
#ifndef EXIT_SUCCESS
#define EXIT_SUCCESS 0
#endif /* !defined EXIT_SUCCESS */
#ifndef EXIT_FAILURE
#define EXIT_FAILURE 1
#endif /* !defined EXIT_FAILURE */
#ifndef SECSPERMIN
#define SECSPERMIN 60
#endif /* !defined SECSPERMIN */
#ifndef MINSPERHOUR
#define MINSPERHOUR 60
#endif /* !defined MINSPERHOUR */
#ifndef SECSPERHOUR
#define SECSPERHOUR (SECSPERMIN * MINSPERHOUR)
#endif /* !defined SECSPERHOUR */
#ifndef HOURSPERDAY
#define HOURSPERDAY 24
#endif /* !defined HOURSPERDAY */
#ifndef EPOCH_YEAR
#define EPOCH_YEAR 1970
#endif /* !defined EPOCH_YEAR */
#ifndef TM_YEAR_BASE
#define TM_YEAR_BASE 1900
#endif /* !defined TM_YEAR_BASE */
#ifndef DAYSPERNYEAR
#define DAYSPERNYEAR 365
#endif /* !defined DAYSPERNYEAR */
#ifndef isleap
#define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
#endif /* !defined isleap */
#ifndef isleap_sum
/*
** See tzfile.h for details on isleap_sum.
*/
#define isleap_sum(a, b) isleap((a) % 400 + (b) % 400)
#endif /* !defined isleap_sum */
#define SECSPERDAY ((int_fast32_t) SECSPERHOUR * HOURSPERDAY)
#define SECSPERNYEAR (SECSPERDAY * DAYSPERNYEAR)
#define SECSPERLYEAR (SECSPERNYEAR + SECSPERDAY)
#define SECSPER400YEARS (SECSPERNYEAR * (intmax_t) (300 + 3) \
+ SECSPERLYEAR * (intmax_t) (100 - 3))
/*
** True if SECSPER400YEARS is known to be representable as an
** intmax_t. It's OK that SECSPER400YEARS_FITS can in theory be false
** even if SECSPER400YEARS is representable, because when that happens
** the code merely runs a bit more slowly, and this slowness doesn't
** occur on any practical platform.
*/
enum { SECSPER400YEARS_FITS = SECSPERLYEAR <= INTMAX_MAX / 400 };
#ifndef HAVE_GETTEXT
#define HAVE_GETTEXT 0
#endif
#if HAVE_GETTEXT
#include "locale.h" /* for setlocale */
#include "libintl.h"
#endif /* HAVE_GETTEXT */
#if 2 < __GNUC__ || (__GNUC__ == 2 && 96 <= __GNUC_MINOR__)
# define ATTRIBUTE_PURE __attribute__ ((__pure__))
#else
# define ATTRIBUTE_PURE /* empty */
#endif
/*
** For the benefit of GNU folk...
** '_(MSGID)' uses the current locale's message library string for MSGID.
** The default is to use gettext if available, and use MSGID otherwise.
*/
#ifndef _
#if HAVE_GETTEXT
#define _(msgid) gettext(msgid)
#else /* !HAVE_GETTEXT */
#define _(msgid) msgid
#endif /* !HAVE_GETTEXT */
#endif /* !defined _ */
#if !defined TZ_DOMAIN && defined HAVE_GETTEXT
# define TZ_DOMAIN "tz"
#endif
#if ! HAVE_LOCALTIME_RZ
# undef timezone_t
# define timezone_t char **
#endif
extern char ** environ;
extern int getopt(int argc, char * const argv[],
const char * options);
extern char * optarg;
extern int optind;
extern char * tzname[2];
/* The minimum and maximum finite time values. */
static time_t const absolute_min_time =
((time_t) -1 < 0
? (time_t) -1 << (CHAR_BIT * sizeof (time_t) - 1)
: 0);
static time_t const absolute_max_time =
((time_t) -1 < 0
? - (~ 0 < 0) - ((time_t) -1 << (CHAR_BIT * sizeof (time_t) - 1))
: -1);
static int longest;
static char * progname;
static bool warned;
static bool errout;
static char const *abbr(struct tm const *);
static intmax_t delta(struct tm *, struct tm *) ATTRIBUTE_PURE;
static void dumptime(struct tm const *);
static time_t hunt(timezone_t, char *, time_t, time_t);
static void show(timezone_t, char *, time_t, bool);
static const char *tformat(void);
static time_t yeartot(intmax_t) ATTRIBUTE_PURE;
/* Is A an alphabetic character in the C locale? */
static bool
is_alpha(char a)
{
switch (a) {
default:
return false;
case 'A': case 'B': case 'C': case 'D': case 'E': case 'F': case 'G':
case 'H': case 'I': case 'J': case 'K': case 'L': case 'M': case 'N':
case 'O': case 'P': case 'Q': case 'R': case 'S': case 'T': case 'U':
case 'V': case 'W': case 'X': case 'Y': case 'Z':
case 'a': case 'b': case 'c': case 'd': case 'e': case 'f': case 'g':
case 'h': case 'i': case 'j': case 'k': case 'l': case 'm': case 'n':
case 'o': case 'p': case 'q': case 'r': case 's': case 't': case 'u':
case 'v': case 'w': case 'x': case 'y': case 'z':
return true;
}
}
/* Return A + B, exiting if the result would overflow. */
static size_t
sumsize(size_t a, size_t b)
{
size_t sum = a + b;
if (sum < a) {
fprintf(stderr, "%s: size overflow\n", progname);
exit(EXIT_FAILURE);
}
return sum;
}
#if ! HAVE_TZSET
# undef tzset
# define tzset zdump_tzset
static void tzset(void) { }
#endif
/* Assume gmtime_r works if localtime_r does.
A replacement localtime_r is defined below if needed. */
#if ! HAVE_LOCALTIME_R
# undef gmtime_r
# define gmtime_r zdump_gmtime_r
static struct tm *
gmtime_r(time_t *tp, struct tm *tmp)
{
struct tm *r = gmtime(tp);
if (r) {
*tmp = *r;
r = tmp;
}
return r;
}
#endif
/* Platforms with TM_ZONE don't need tzname, so they can use the
faster localtime_rz or localtime_r if available. */
#if defined TM_ZONE && HAVE_LOCALTIME_RZ
# define USE_LOCALTIME_RZ true
#else
# define USE_LOCALTIME_RZ false
#endif
#if ! USE_LOCALTIME_RZ
# if !defined TM_ZONE || ! HAVE_LOCALTIME_R || ! HAVE_TZSET
# undef localtime_r
# define localtime_r zdump_localtime_r
static struct tm *
localtime_r(time_t *tp, struct tm *tmp)
{
struct tm *r = localtime(tp);
if (r) {
*tmp = *r;
r = tmp;
}
return r;
}
# endif
# undef localtime_rz
# define localtime_rz zdump_localtime_rz
static struct tm *
localtime_rz(timezone_t rz, time_t *tp, struct tm *tmp)
{
return localtime_r(tp, tmp);
}
# ifdef TYPECHECK
# undef mktime_z
# define mktime_z zdump_mktime_z
static time_t
mktime_z(timezone_t tz, struct tm *tmp)
{
return mktime(tmp);
}
# endif
# undef tzalloc
# undef tzfree
# define tzalloc zdump_tzalloc
# define tzfree zdump_tzfree
static timezone_t
tzalloc(char const *val)
{
static char **fakeenv;
char **env = fakeenv;
char *env0;
if (! env) {
char **e = environ;
int to;
while (*e++)
continue;
env = malloc(sumsize(sizeof *environ,
(e - environ) * sizeof *environ));
if (! env) {
perror(progname);
exit(EXIT_FAILURE);
}
to = 1;
for (e = environ; (env[to] = *e); e++)
to += strncmp(*e, "TZ=", 3) != 0;
}
env0 = malloc(sumsize(sizeof "TZ=", strlen(val)));
if (! env0) {
perror(progname);
exit(EXIT_FAILURE);
}
env[0] = strcat(strcpy(env0, "TZ="), val);
environ = fakeenv = env;
tzset();
return env;
}
static void
tzfree(timezone_t env)
{
environ = env + 1;
free(env[0]);
}
#endif /* ! USE_LOCALTIME_RZ */
/* A UTC time zone, and its initializer. */
static timezone_t gmtz;
static void
gmtzinit(void)
{
if (USE_LOCALTIME_RZ) {
static char const utc[] = "UTC0";
gmtz = tzalloc(utc);
if (!gmtz) {
perror(utc);
exit(EXIT_FAILURE);
}
}
}
/* Convert *TP to UTC, storing the broken-down time into *TMP.
Return TMP if successful, NULL otherwise. This is like gmtime_r(TP, TMP),
except typically faster if USE_LOCALTIME_RZ. */
static struct tm *
my_gmtime_r(time_t *tp, struct tm *tmp)
{
return USE_LOCALTIME_RZ ? localtime_rz(gmtz, tp, tmp) : gmtime_r(tp, tmp);
}
#ifndef TYPECHECK
# define my_localtime_rz localtime_rz
#else /* !defined TYPECHECK */
static struct tm *
my_localtime_rz(timezone_t tz, time_t *tp, struct tm *tmp)
{
tmp = localtime_rz(tz, tp, tmp);
if (tmp) {
struct tm tm;
register time_t t;
tm = *tmp;
t = mktime_z(tz, &tm);
if (t != *tp) {
fflush(stdout);
fprintf(stderr, "\n%s: ", progname);
fprintf(stderr, tformat(), *tp);
fprintf(stderr, " ->");
fprintf(stderr, " year=%d", tmp->tm_year);
fprintf(stderr, " mon=%d", tmp->tm_mon);
fprintf(stderr, " mday=%d", tmp->tm_mday);
fprintf(stderr, " hour=%d", tmp->tm_hour);
fprintf(stderr, " min=%d", tmp->tm_min);
fprintf(stderr, " sec=%d", tmp->tm_sec);
fprintf(stderr, " isdst=%d", tmp->tm_isdst);
fprintf(stderr, " -> ");
fprintf(stderr, tformat(), t);
fprintf(stderr, "\n");
errout = true;
}
}
return tmp;
}
#endif /* !defined TYPECHECK */
static void
abbrok(const char *const abbrp, const char *const zone)
{
register const char * cp;
register const char * wp;
if (warned)
return;
cp = abbrp;
wp = NULL;
while (is_alpha(*cp))
++cp;
if (cp - abbrp == 0)
wp = _("lacks alphabetic at start");
else if (cp - abbrp < 3)
wp = _("has fewer than 3 alphabetics");
else if (cp - abbrp > 6)
wp = _("has more than 6 alphabetics");
if (wp == NULL && (*cp == '+' || *cp == '-')) {
++cp;
if ('0' <= *cp && *cp <= '9')
if (*cp++ == '1' && '0' <= *cp && *cp <= '4')
cp++;
if (*cp != '\0')
wp = _("differs from POSIX standard");
}
if (wp == NULL)
return;
fflush(stdout);
fprintf(stderr,
_("%s: warning: zone \"%s\" abbreviation \"%s\" %s\n"),
progname, zone, abbrp, wp);
warned = errout = true;
}
/* Return a time zone abbreviation. If the abbreviation needs to be
saved, use *BUF (of size *BUFALLOC) to save it, and return the
abbreviation in the possibly-reallocated *BUF. Otherwise, just
return the abbreviation. Get the abbreviation from TMP.
Exit on memory allocation failure. */
static char const *
saveabbr(char **buf, size_t *bufalloc, struct tm const *tmp)
{
char const *ab = abbr(tmp);
if (HAVE_LOCALTIME_RZ)
return ab;
else {
size_t ablen = strlen(ab);
if (*bufalloc <= ablen) {
free(*buf);
/* Make the new buffer at least twice as long as the old,
to avoid O(N**2) behavior on repeated calls. */
*bufalloc = sumsize(*bufalloc, ablen + 1);
*buf = malloc(*bufalloc);
if (! *buf) {
perror(progname);
exit(EXIT_FAILURE);
}
}
return strcpy(*buf, ab);
}
}
static void
close_file(FILE *stream)
{
char const *e = (ferror(stream) ? _("I/O error")
: fclose(stream) != 0 ? strerror(errno) : NULL);
if (e) {
fprintf(stderr, "%s: %s\n", progname, e);
exit(EXIT_FAILURE);
}
}
static void
usage(FILE * const stream, const int status)
{
fprintf(stream,
_("%s: usage: %s [--version] [--help] [-{vV}] [-{ct} [lo,]hi] zonename ...\n"
"\n"
"Report bugs to %s.\n"),
progname, progname, REPORT_BUGS_TO);
if (status == EXIT_SUCCESS)
close_file(stream);
exit(status);
}
int
main(int argc, char *argv[])
{
/* These are static so that they're initially zero. */
static char * abbrev;
static size_t abbrevsize;
static struct tm newtm;
register int i;
register bool vflag;
register bool Vflag;
register char * cutarg;
register char * cuttimes;
register time_t cutlotime;
register time_t cuthitime;
time_t now;
time_t t;
time_t newt;
struct tm tm;
register struct tm * tmp;
register struct tm * newtmp;
cutlotime = absolute_min_time;
cuthitime = absolute_max_time;
#if HAVE_GETTEXT
setlocale(LC_ALL, "");
#ifdef TZ_DOMAINDIR
bindtextdomain(TZ_DOMAIN, TZ_DOMAINDIR);
#endif /* defined TEXTDOMAINDIR */
textdomain(TZ_DOMAIN);
#endif /* HAVE_GETTEXT */
progname = argv[0];
for (i = 1; i < argc; ++i)
if (strcmp(argv[i], "--version") == 0) {
printf("zdump %s%s\n", PKGVERSION, TZVERSION);
return EXIT_SUCCESS;
} else if (strcmp(argv[i], "--help") == 0) {
usage(stdout, EXIT_SUCCESS);
}
vflag = Vflag = false;
cutarg = cuttimes = NULL;
for (;;)
switch (getopt(argc, argv, "c:t:vV")) {
case 'c': cutarg = optarg; break;
case 't': cuttimes = optarg; break;
case 'v': vflag = true; break;
case 'V': Vflag = true; break;
case -1:
if (! (optind == argc - 1 && strcmp(argv[optind], "=") == 0))
goto arg_processing_done;
/* Fall through. */
default:
usage(stderr, EXIT_FAILURE);
}
arg_processing_done:;
if (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)
hi = absolute_min_time;
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)
hi = absolute_min_time;
cuthitime = hi;
}
} else {
fprintf(stderr,
_("%s: wild -t argument %s\n"),
progname, cuttimes);
return EXIT_FAILURE;
}
}
}
gmtzinit();
now = time(NULL);
longest = 0;
for (i = optind; i < argc; i++) {
size_t arglen = strlen(argv[i]);
if (longest < arglen)
longest = arglen < INT_MAX ? arglen : INT_MAX;
}
for (i = optind; i < argc; ++i) {
timezone_t tz = tzalloc(argv[i]);
char const *ab;
if (!tz) {
perror(argv[i]);
return EXIT_FAILURE;
}
if (! (vflag | Vflag)) {
show(tz, argv[i], now, false);
tzfree(tz);
continue;
}
warned = false;
t = absolute_min_time;
if (!Vflag) {
show(tz, argv[i], t, true);
t += SECSPERDAY;
show(tz, argv[i], t, true);
}
if (t < cutlotime)
t = cutlotime;
tmp = my_localtime_rz(tz, &t, &tm);
if (tmp)
ab = saveabbr(&abbrev, &abbrevsize, &tm);
while (t < cuthitime) {
newt = ((t < absolute_max_time - SECSPERDAY / 2
&& t + SECSPERDAY / 2 < cuthitime)
? t + SECSPERDAY / 2
: cuthitime);
newtmp = localtime_rz(tz, &newt, &newtm);
if ((tmp == NULL || newtmp == NULL) ? (tmp != newtmp) :
(delta(&newtm, &tm) != (newt - t) ||
newtm.tm_isdst != tm.tm_isdst ||
strcmp(abbr(&newtm), ab) != 0)) {
newt = hunt(tz, argv[i], t, newt);
newtmp = localtime_rz(tz, &newt, &newtm);
if (newtmp)
ab = saveabbr(&abbrev, &abbrevsize,
&newtm);
}
t = newt;
tm = newtm;
tmp = newtmp;
}
if (!Vflag) {
t = absolute_max_time;
t -= SECSPERDAY;
show(tz, argv[i], t, true);
t += SECSPERDAY;
show(tz, argv[i], t, true);
}
tzfree(tz);
}
close_file(stdout);
if (errout && (ferror(stderr) || fclose(stderr) != 0))
return EXIT_FAILURE;
return EXIT_SUCCESS;
}
static time_t
yeartot(const 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;
}
static time_t
hunt(timezone_t tz, char *name, time_t lot, time_t hit)
{
static char * loab;
static size_t loabsize;
char const * ab;
time_t t;
struct tm lotm;
register struct tm * lotmp;
struct tm tm;
register struct tm * tmp;
lotmp = my_localtime_rz(tz, &lot, &lotm);
if (lotmp)
ab = saveabbr(&loab, &loabsize, &lotm);
for ( ; ; ) {
time_t diff = hit - lot;
if (diff < 2)
break;
t = lot;
t += diff / 2;
if (t <= lot)
++t;
else if (t >= hit)
--t;
tmp = my_localtime_rz(tz, &t, &tm);
if ((lotmp == NULL || tmp == NULL) ? (lotmp == tmp) :
(delta(&tm, &lotm) == (t - lot) &&
tm.tm_isdst == lotm.tm_isdst &&
strcmp(abbr(&tm), ab) == 0)) {
lot = t;
lotm = tm;
lotmp = tmp;
} else hit = t;
}
show(tz, name, lot, true);
show(tz, name, hit, true);
return hit;
}
/*
** Thanks to Paul Eggert for logic used in delta.
*/
static intmax_t
delta(struct tm * newp, struct tm *oldp)
{
register intmax_t 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;
}
#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 UTC for
the same instant, return A's UTC offset in seconds, where positive
offsets are east of Greenwich. On failure, return LONG_MIN. */
static long
gmtoff(struct tm const *a, struct tm const *b)
{
#ifdef TM_GMTOFF
return a->TM_GMTOFF;
#else
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 ", longest, zone);
if (v) {
gmtmp = my_gmtime_r(&t, &gmtm);
if (gmtmp == NULL) {
printf(tformat(), t);
} else {
dumptime(gmtmp);
printf(" UT");
}
printf(" = ");
}
tmp = my_localtime_rz(tz, &t, &tm);
dumptime(tmp);
if (tmp != NULL) {
if (*abbr(tmp) != '\0')
printf(" %s", abbr(tmp));
if (v) {
long off = gmtoff(tmp, 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);
}
static char const *
abbr(struct tm const *tmp)
{
#ifdef TM_ZONE
return tmp->TM_ZONE;
#else
return (0 <= tmp->tm_isdst && tzname[0 < tmp->tm_isdst]
? tzname[0 < tmp->tm_isdst]
: "");
#endif
}
/*
** 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(void)
{
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[][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) {
printf("NULL");
return;
}
/*
** 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.
*/
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];
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)
printf("%d", trail);
else printf("%d%d", lead, ((trail < 0) ? -trail : trail));
}
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