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#define _GNU_SOURCE
#include <assert.h>
#include <err.h>
#include <errno.h>
#include <getopt.h>
#include <libgen.h>
#include <locale.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <libintl.h>
#define _(x) gettext(x)
#define NSEC_PER_SEC UINT64_C(1'000'000'000)
#if __APPLE__
#define TIMER_ABSTIME (1)
int clock_nanosleep(clockid_t, int, const struct timespec *, struct timespec *);
#endif
time_t syncs(time_t), syncm(time_t), synch(time_t);
[[noreturn]] static void
usage(const char *argv0)
{
fprintf(stderr,
_("Usage: %s [-i interval] [format ...]\n"
" %s -h\n"),
argv0, argv0);
exit(EXIT_FAILURE);
}
int
main(int argc, char **argv)
{
setlocale(LC_ALL, "");
bindtextdomain("tiktok", PODIR);
textdomain("tiktok");
char interval = 's';
const char *argv0 = basename(argv[0]);
const char *optstr = "hi:";
static struct option longopts[] = {
{"help", no_argument, nullptr, 'h'},
{"interval", required_argument, nullptr, 'i'},
{nullptr, 0, nullptr, 0 },
};
for (;;) {
int opt = getopt_long(argc, argv, optstr, longopts, nullptr);
if (opt == -1)
break;
switch (opt) {
case 'h':
execlp("man", "man", "1", argv0, nullptr);
err(EXIT_FAILURE, "execlp: man");
case 'i':
if (strlen(optarg) == 1) {
interval = *optarg;
if (interval == 's' || interval == 'm' || interval == 'h')
break;
}
errx(EXIT_FAILURE,
_("invalid interval ‘%s’\nRead the %s(1) manual page for valid intervals"),
optarg, argv0);
default:
usage(argv0);
}
}
argc -= optind;
argv += optind;
if (argc == 0) {
argc = 1;
argv = (char *[]){"%c"};
}
time_t (*sync)(time_t) =
interval == 's' ? syncs
: interval == 'm' ? syncm
: interval == 'h' ? synch
: /* default */ syncs;
const char *tzorig = getenv("TZ");
for (;;) {
struct timespec now, then;
if (clock_gettime(CLOCK_REALTIME, &now) == -1)
warn(_("failed to get the time"));
if (tzorig != nullptr) {
if (setenv("TZ", tzorig, true) == -1)
warn(_("failed to set the timezone"));
} else if (unsetenv("TZ") == -1)
warn(_("failed to set the timezone"));
for (int i = 0; i < argc; i++) {
if (strlen(argv[i]) >= 3 && memcmp("TZ=", argv[i], 3) == 0) {
if (putenv(argv[i]) == -1)
warn(_("failed to set the timezone"));
} else {
static char *buf;
static size_t bufsz = 1024;
if (buf == nullptr && (buf = malloc(bufsz)) == nullptr)
err(EXIT_FAILURE, "malloc");
struct tm *tm = localtime(&now.tv_sec);
size_t n = strftime(buf, bufsz, argv[i], tm);
while (n == 0) {
bufsz *= 2;
if ((buf = realloc(buf, bufsz)) == nullptr)
err(EXIT_FAILURE, "malloc");
n = strftime(buf, bufsz, argv[i], tm);
}
fputs(buf, stdout);
}
}
putchar('\n');
if (clock_gettime(CLOCK_REALTIME, &then) == -1)
warn(_("failed to get the time"));
/* Duration of the clock formatting and printing */
struct timespec Δ = {
then.tv_sec - now.tv_sec,
then.tv_nsec - now.tv_nsec,
};
if (Δ.tv_nsec < 0) {
Δ.tv_nsec += NSEC_PER_SEC;
Δ.tv_sec--;
}
struct timespec rqtp = {
.tv_sec = sync(then.tv_sec),
.tv_nsec = 0,
};
int rv;
do
rv = clock_nanosleep(CLOCK_REALTIME, TIMER_ABSTIME, &rqtp, nullptr);
while (rv == -1 && errno == EINTR);
}
/* We should never get here */
return EXIT_FAILURE;
}
time_t
syncs(time_t n)
{
return n + 1;
}
time_t
syncm(time_t n)
{
return n + 60 - n%60;
}
time_t
synch(time_t n)
{
return n + 3600 - n%3600;
}
#if __APPLE__
int
clock_nanosleep(clockid_t clock_id, int flags, const struct timespec *req,
struct timespec *rem)
{
/* The rest not implemented */
assert(flags == TIMER_ABSTIME);
struct timespec now, Δ;
if (clock_gettime(clock_id, &now) != 0)
return errno;
Δ.tv_sec = req->tv_sec - now.tv_sec;
Δ.tv_nsec = req->tv_nsec - now.tv_nsec;
if (Δ.tv_sec < 0) {
Δ.tv_sec = 0;
Δ.tv_nsec = 0;
goto out;
}
if (Δ.tv_nsec < 0) {
if (Δ.tv_sec == 0) {
Δ.tv_sec = 0;
Δ.tv_nsec = 0;
goto out;
}
Δ.tv_sec--;
Δ.tv_nsec += NSEC_PER_SEC;
}
out:
return nanosleep(&Δ, rem);
}
#endif
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