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af1adb2c109b32380cceb527f6ad9f35d128e47d
amiga-tz/zdump_amiga.c
llsth af1adb2c10 Version 1.03 changes
2015-07-10 23:50:02 +02:00

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/*
* Copyright (c) 2015 Carsten Larsen
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
//////////////////////////////////////////////////////////////////////////////////////
#include "amiga_tz.h"
#include "version.h"
const char *vers = "\0$VER: ZDump" AMIGA_VERSION;
//////////////////////////////////////////////////////////////////////////////////////
#ifndef NETBSD_INSPIRED
# define NETBSD_INSPIRED 1
#endif
#ifndef USE_LTZ
# define USE_LTZ 1
#endif
#if USE_LTZ
# include "private.h"
#endif
#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 char * tzname[2];
/* The minimum and maximum finite time values. */
enum { atime_shift = CHAR_BIT * sizeof (time_t) - 2 };
time_t const absolute_min_time =
((time_t) -1 < 0
? (- ((time_t) ~ (time_t) 0 < 0)
- (((time_t) 1 << atime_shift) - 1 + ((time_t) 1 << atime_shift)))
: 0);
time_t const absolute_max_time =
((time_t) -1 < 0
? (((time_t) 1 << atime_shift) - 1 + ((time_t) 1 << atime_shift))
: -1);
int longest;
bool warned;
bool errout;
char const *abbr(struct tm const *);
intmax_t delta(struct tm *, struct tm *) ATTRIBUTE_PURE;
void dumptime(struct tm const *);
time_t hunt(timezone_t, char *, time_t, time_t);
void show(timezone_t, char *, time_t, bool);
const char *tformat(void);
time_t yeartot(intmax_t) ATTRIBUTE_PURE;
/* Return A + B, exiting if the result would overflow. */
size_t sumsize(size_t a, size_t b)
{
size_t sum = a + b;
if (sum < a) {
fprintf(stderr, "size overflow\n");
exit(EXIT_FAILURE);
}
return sum;
}
#if ! HAVE_TZSET
# undef tzset
# define tzset zdump_tzset
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
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
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
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
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
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;
}
void tzfree(timezone_t env)
{
environ = env + 1;
free(env[0]);
}
#endif /* ! USE_LOCALTIME_RZ */
/* A UTC time zone, and its initializer. */
timezone_t gmtz;
void gmtzinit(void)
{
if (USE_LOCALTIME_RZ) {
static char const utc[] = "GMT";
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. */
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 */
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 */
void abbrok(const char *const abbrp, const char *const zone)
{
const char *cp;
const char *wp;
if (warned)
return;
cp = abbrp;
wp = NULL;
while (isalpha(*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,
_("Warning: zone \"%s\" abbreviation \"%s\" %s\n"),
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. */
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);
}
}
//////////////////////////////////////////////////////////////////////////////////////
#define ARGSFORMAT "VERBOSE/S,VERBOSE2/S,C=CUTOFF/K,T=CUTOFFVERBOSE/K,ZONENAMES/M"
struct progargs {
long vflag;
long Vflag;
char *cutarg;
char *cuttimes;
char **zonenames;
};
int main(int argc, char *argv[])
{
struct tm tm;
struct tm newtm;
struct tm *newtmp;
struct RDArgs *rdargs;
char *abbrev = NULL;
size_t abbrevsize = 0;
int i = 0;
time_t cutlotime = absolute_min_time;
time_t cuthitime = absolute_max_time;
time_t now = 0;
time_t t = 0;
time_t newt = 0;
struct tm *tmp = NULL;
struct progargs args = {
FALSE,
FALSE,
NULL,
NULL,
NULL
};
rdargs = ReadArgs((STRPTR)ARGSFORMAT, (APTR)&args, NULL);
if (!rdargs)
{
PrintFault(IoErr(), (APTR)argv[0]);
exit(5);
}
if (args.vflag | args.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 (args.cutarg != NULL) {
lo = strtoimax(args.cutarg, &loend, 10);
if (args.cutarg != loend && !*loend) {
hi = lo;
cuthiyear = hi;
} else if (args.cutarg != loend && *loend == ','
&& (hi = strtoimax(loend + 1, &hiend, 10),
loend + 1 != hiend && !*hiend)) {
cutloyear = lo;
cuthiyear = hi;
} else {
VPrintf((STRPTR)"Wild C argument %s\n", (IPTR*)args.cutarg);
return EXIT_FAILURE;
}
}
if (args.cutarg != NULL || args.cuttimes == NULL) {
cutlotime = yeartot(cutloyear);
cuthitime = yeartot(cuthiyear);
}
if (args.cuttimes != NULL) {
lo = strtoimax(args.cuttimes, &loend, 10);
if (args.cuttimes != loend && !*loend) {
hi = lo;
if (hi < cuthitime) {
if (hi < absolute_min_time)
hi = absolute_min_time;
cuthitime = hi;
}
} else if (args.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 {
VPrintf((STRPTR)"Wild CTargument %s\n", (IPTR*)args.cuttimes);
return EXIT_FAILURE;
}
}
}
gmtzinit();
now = time(NULL);
longest = 0;
for (i = 0; args.zonenames[i]; i++) {
size_t arglen = strlen(args.zonenames[i]);
if (longest < arglen)
longest = arglen < INT_MAX ? arglen : INT_MAX;
}
for (i = 0; args.zonenames[i]; i++) {
timezone_t tz = tzalloc(args.zonenames[i]);
char const *ab = NULL;
if (!tz) {
perror(args.zonenames[i]);
return EXIT_FAILURE;
}
if (! (args.vflag | args.Vflag)) {
show(tz, args.zonenames[i], now, false);
tzfree(tz);
continue;
}
warned = false;
t = absolute_min_time;
if (!args.Vflag) {
show(tz, args.zonenames[i], t, true);
t += SECSPERDAY;
show(tz, args.zonenames[i], t, true);
}
if (t < cutlotime)
t = cutlotime;
tmp = 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, args.zonenames[i], t, newt);
newtmp = localtime_rz(tz, &newt, &newtm);
if (newtmp)
ab = saveabbr(&abbrev, &abbrevsize,
&newtm);
}
t = newt;
tm = newtm;
tmp = newtmp;
}
if (!args.Vflag) {
t = absolute_max_time;
t -= SECSPERDAY;
show(tz, args.zonenames[i], t, true);
t += SECSPERDAY;
show(tz, args.zonenames[i], t, true);
}
tzfree(tz);
}
if (errout && (ferror(stderr) || fclose(stderr) != 0))
return EXIT_FAILURE;
return EXIT_SUCCESS;
}
//////////////////////////////////////////////////////////////////////////////////////
time_t yeartot(const intmax_t y)
{
intmax_t myy, seconds, years;
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;
}
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;
struct tm * lotmp;
struct tm tm;
struct tm * tmp;
INITIALIZE(ab);
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.
*/
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. */
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. */
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
}
void show(timezone_t tz, char *zone, time_t t, bool v)
{
struct tm *tmp;
struct tm *gmtmp;
struct tm tm, gmtm;
INITIALIZE(gmtmp);
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);
}
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.
*/
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";
}
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"
};
const char *wn;
const char *mn;
int lead;
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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