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zdump.c
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zdump.c
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/* Dump time zone data in a textual format. */
/*
** This file is in the public domain, so clarified as of
** 2009-05-17 by Arthur David Olson.
*/
#include "version.h"
#ifndef NETBSD_INSPIRED
# define NETBSD_INSPIRED 1
#endif
#include "private.h"
#include <stdio.h>
#ifndef HAVE_SNPRINTF
# define HAVE_SNPRINTF (199901 <= __STDC_VERSION__)
#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 */
#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 };
#if HAVE_GETTEXT
# include <locale.h> /* for setlocale */
#endif /* HAVE_GETTEXT */
#if ! HAVE_LOCALTIME_RZ
# undef timezone_t
# define timezone_t char **
#endif
#if !HAVE_POSIX_DECLS
extern int getopt(int argc, char * const argv[],
const char * options);
extern char * optarg;
extern int optind;
#endif
/* The minimum and maximum finite time values. */
enum { atime_shift = CHAR_BIT * sizeof(time_t) - 2 };
static 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);
static time_t const absolute_max_time =
((time_t) -1 < 0
? (((time_t) 1 << atime_shift) - 1 + ((time_t) 1 << atime_shift))
: -1);
static int longest;
static char const *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, bool);
static void show(timezone_t, char *, time_t, bool);
static void showextrema(timezone_t, char *, time_t, struct tm *, time_t);
static void showtrans(char const *, struct tm const *, time_t, char const *,
char const *);
static const char *tformat(void);
static time_t yeartot(intmax_t) ATTRIBUTE_PURE;
/* Is C an ASCII digit? */
static bool
is_digit(char c)
{
return '0' <= c && c <= '9';
}
/* 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;
}
/* Return a pointer to a newly allocated buffer of size SIZE, exiting
on failure. SIZE should be nonzero. */
static void * ATTRIBUTE_MALLOC
xmalloc(size_t size)
{
void *p = malloc(size);
if (!p) {
fprintf(stderr, _("%s: Memory exhausted\n"), progname);
exit(EXIT_FAILURE);
}
return p;
}
#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)
{
# if HAVE_SETENV
if (setenv("TZ", val, 1) != 0) {
perror("setenv");
exit(EXIT_FAILURE);
}
tzset();
return &optarg; /* Any valid non-null char ** will do. */
# else
enum { TZeqlen = 3 };
static char const TZeq[TZeqlen] = "TZ=";
static char **fakeenv;
static size_t fakeenv0size;
void *freeable = NULL;
char **env = fakeenv, **initial_environ;
size_t valsize = strlen(val) + 1;
if (fakeenv0size < valsize) {
char **e = environ, **to;
ptrdiff_t initial_nenvptrs; /* Counting the trailing NULL pointer. */
while (*e++)
continue;
initial_nenvptrs = e - environ;
fakeenv0size = sumsize(valsize, valsize);
fakeenv0size = max(fakeenv0size, 64);
freeable = env;
fakeenv = env =
xmalloc(sumsize(sumsize(sizeof *environ,
initial_nenvptrs * sizeof *environ),
sumsize(TZeqlen, fakeenv0size)));
to = env + 1;
for (e = environ; (*to = *e); e++)
to += strncmp(*e, TZeq, TZeqlen) != 0;
env[0] = memcpy(to + 1, TZeq, TZeqlen);
}
memcpy(env[0] + TZeqlen, val, valsize);
initial_environ = environ;
environ = env;
tzset();
free(freeable);
return initial_environ;
# endif
}
static void
tzfree(timezone_t initial_environ)
{
# if !HAVE_SETENV
environ = initial_environ;
tzset();
# endif
}
#endif /* ! USE_LOCALTIME_RZ */
/* A UT time zone, and its initializer. */
static timezone_t gmtz;
static void
gmtzinit(void)
{
if (USE_LOCALTIME_RZ) {
/* Try "GMT" first to find out whether this is one of the rare
platforms where time_t counts leap seconds; this works due to
the "Zone GMT 0 - GMT" line in the "etcetera" file. If "GMT"
fails, fall back on "GMT0" which might be similar due to the
"Link GMT GMT0" line in the "backward" file, and which
should work on all POSIX platforms. The rest of zdump does not
use the "GMT" abbreviation that comes from this setting, so it
is OK to use "GMT" here rather than the more-modern "UTC" which
would not work on platforms that omit the "backward" file. */
gmtz = tzalloc("GMT");
if (!gmtz) {
static char const gmt0[] = "GMT0";
gmtz = tzalloc(gmt0);
if (!gmtz) {
perror(gmt0);
exit(EXIT_FAILURE);
}
}
}
}
/* Convert *TP to UT, 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;
while (is_alpha(*cp) || is_digit(*cp) || *cp == '-' || *cp == '+')
++cp;
if (*cp)
wp = _("has characters other than ASCII alphanumerics, '-' or '+'");
else if (cp - abbrp < 3)
wp = _("has fewer than 3 characters");
else if (cp - abbrp > 6)
wp = _("has more than 6 characters");
else
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 = xmalloc(*bufalloc);
}
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 OPTIONS TIMEZONE ...\n"
"Options include:\n"
" -c [L,]U Start at year L (default -500), end before year U (default 2500)\n"
" -t [L,]U Start at time L, end before time U (in seconds since 1970)\n"
" -i List transitions briefly (format is experimental)\n" \
" -v List transitions verbosely\n"
" -V List transitions a bit less verbosely\n"
" --help Output this help\n"
" --version Output version info\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;
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;
bool iflag = false;
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] ? argv[0] : "zdump";
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:it:vV")) {
case 'c': cutarg = optarg; break;
case 't': cuttimes = optarg; break;
case 'i': iflag = true; 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 (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, argv[i], 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 with name NAME, 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, char *name, time_t lot, time_t hit, bool only_ok)
{
static char * loab;
static size_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, time_t *t, 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 ", 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, zone, 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, size_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, size_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 size_t
format_quoted_string(char *buf, size_t size, char const *p)
{
char *b = buf;
size_t s = size;
if (!s)
return size;
*b++ = '"', s--;
for (;;) {