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// SPDX-FileCopyrightText: 2014-2017, 2025 Tomasz Kramkowski <tomasz@kramkow.ski>
// SPDX-License-Identifier: GPL-3.0-or-later
#include <assert.h>
#include <errno.h>
#include <limits.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdnoreturn.h>
#include <string.h>
#include <sys/ioctl.h>
#include <time.h>
#include <unistd.h>
static const unsigned long long SEC_SECOND = 1, SEC_MINUTE = 60, SEC_HOUR = 3600,
SEC_DAY = 86400, SEC_MONTH = 2629800,
SEC_YEAR = 31557600;
static const unsigned long INTERVAL_NSEC = 1000000000 / 4;
volatile unsigned short term_width = 0;
__attribute__((format(printf, 1, 2))) static noreturn void fatal(const char *fmt, ...)
{
va_list ap;
int errno_save = errno;
assert(fmt != NULL);
fprintf(stderr, "fatal: ");
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
if (fmt[0] != '\0' && fmt[strlen(fmt) - 1] == ':') {
fprintf(stderr, " %s", strerror(errno_save));
}
fputc('\n', stderr);
exit(EXIT_FAILURE);
}
volatile sig_atomic_t got_sigwinch = 0;
static void sigwinch(int sig)
{
if (sig != SIGWINCH) return;
got_sigwinch = 1;
}
static void updatewidth(bool force)
{
struct winsize ws;
if (!got_sigwinch && !force) return;
if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1)
fatal("Unable to get terminal width:");
term_width = ws.ws_col;
got_sigwinch = 0;
}
static void clear_line(void)
{
fputs("\r\x1b[K", stdout);
if (fflush(stdout) != 0) fatal("Unable to flush stdout:");
}
static void
format_dmy(char *dest, size_t size, const char *name, unsigned long long count)
{
if (count == 1)
snprintf(dest, size, "%llu %s, ", count, name);
else if (count > 1)
snprintf(dest, size, "%llu %ss, ", count, name);
else
dest[0] = '\0';
}
static void print_time(unsigned long long total_sec, bool show_colon)
{
unsigned long long count, hours, minutes, seconds;
char colon = show_colon ? ':' : ' ', syears[128], smonths[16], sdays[16];
count = total_sec / SEC_YEAR;
total_sec %= SEC_YEAR;
format_dmy(syears, sizeof syears, "year", count);
count = total_sec / SEC_MONTH;
total_sec %= SEC_MONTH;
format_dmy(smonths, sizeof smonths, "month", count);
count = total_sec / SEC_DAY;
total_sec %= SEC_DAY;
format_dmy(sdays, sizeof sdays, "day", count);
hours = total_sec / SEC_HOUR;
total_sec %= SEC_HOUR;
minutes = total_sec / SEC_MINUTE;
total_sec %= SEC_MINUTE;
seconds = total_sec / SEC_SECOND;
total_sec %= SEC_SECOND;
if (total_sec != 0) fatal("Unable to format time");
printf(" %s%s%s%.2llu%c%.2llu%c%.2llu\r", syears, smonths, sdays, hours,
colon, minutes, colon, seconds);
if (fflush(stdout) != 0) fatal("Unable to flush stdout:");
}
static unsigned long long get_seconds(char *code)
{
unsigned long long val, mul;
size_t len;
char *end;
len = strlen(code);
if (len < 2) return 0;
switch (code[len - 1]) {
case 's': mul = SEC_SECOND; break;
case 'm': mul = SEC_MINUTE; break;
case 'h': mul = SEC_HOUR; break;
case 'D': mul = SEC_DAY; break;
case 'M': mul = SEC_MONTH; break;
case 'Y': mul = SEC_YEAR; break;
default: return 0;
}
errno = 0;
val = strtoul(code, &end, 10);
if (val == ULONG_MAX && errno != 0)
fatal("Unable to convert time specifier %s:", code);
if (strlen(end) != 1) fatal("Invalid time specifier %s", code);
// might wrap
return val * mul;
}
int main(int argc, char **argv)
{
int sig;
sigset_t sigset;
struct itimerspec its = {{0, INTERVAL_NSEC}, {0, INTERVAL_NSEC}};
struct sigaction sigact = {.sa_handler = sigwinch};
timer_t timerid;
struct sigevent sev = {
.sigev_notify = SIGEV_SIGNAL,
.sigev_signo = SIGRTMIN,
.sigev_value.sival_ptr = &timerid
};
unsigned long long total_seconds = 0;
if (!isatty(STDOUT_FILENO)) fatal("stdout is not a tty");
if (argc < 2)
fatal("Not enough arguments.\nUsage:\n"
"\t%s <n>{s,m,h,D,M,Y} ...",
argv[0]);
for (int i = 1; i < argc; i++) total_seconds += get_seconds(argv[i]);
if (sigaction(SIGWINCH, &sigact, NULL) != 0)
fatal("Unable to set SIGWINCH signal action:");
if (timer_create(CLOCK_MONOTONIC, &sev, &timerid) != 0)
fatal("Unable to create timer:");
if (sigemptyset(&sigset) != 0) fatal("Unable to empty signal set:");
if (sigaddset(&sigset, SIGRTMIN) != 0)
fatal("Unable to add SIGRTMIN to signal set:");
if (sigprocmask(SIG_BLOCK, &sigset, NULL) != 0)
fatal("Unable to block SIGRTMIN:");
if (timer_settime(timerid, 0, &its, NULL) != 0)
fatal("Unable to set timer:");
updatewidth(true);
for (unsigned long long i = 0; i < total_seconds; i++)
for (int ii = 0; ii < 4; ii++) {
if (sigwait(&sigset, &sig), sig != SIGRTMIN)
fatal("sigwait returned unexpected signal %d", sig);
updatewidth(false);
clear_line();
print_time(total_seconds - i, ii < 2);
}
if (sigaddset(&sigset, SIGINT) != 0)
fatal("Unable to add SIGINT to signal set:");
while (true) {
static bool blink = false;
blink = !blink;
sigwait(&sigset, &sig);
if (sig != SIGRTMIN) break;
clear_line();
if (blink) printf(" -- BEEP --\a\r");
if (fflush(stdout) != 0) fatal("Unable to flush stdout:");
}
timer_delete(timerid);
clear_line();
return 0;
}
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