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/*
* Countdown timer
*
* Copyright (C) 2014 Tomasz Kramkowski <tk@the-tk.com>
*
* This program is free software. It is licensed under version 3 of the
* GNU General Public License.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see [http://www.gnu.org/licenses/].
*/
#include <errno.h>
#include <error.h>
#include <signal.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <time.h>
#include <unistd.h>
#include <limits.h>
static const unsigned long long SEC_SECOND = 1, SEC_MINUTE = 60,
SEC_HOUR = 3600, SEC_DAY = 86400, SEC_MONTH = 2629746,
SEC_YEAR = 31556940;
static const unsigned long interval_nsec = 1000000000 / 4;
volatile unsigned short term_width = 0;
void sigwinch(int sig) {
struct winsize ws;
if (sig != SIGWINCH)
return;
if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1)
error(1, errno, "Failed to get terminal width");
term_width = ws.ws_col;
}
void clear_line(void)
{
if (term_width <= 1)
return;
for (unsigned short i = 0; i < term_width - 1; i++)
putchar(' ');
putchar('\r');
if (fflush(stdout) != 0)
error(1, errno, "Failed to flush stdout");
}
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';
}
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)
error(1, 0, "A bug occured during time formatting");
printf(" %s%s%s%.2llu%c%.2llu%c%.2llu\r", syears, smonths, sdays, hours,
colon, minutes, colon, seconds);
if (fflush(stdout) != 0)
error(1, errno, "Failed to flush stdout");
}
unsigned long long get_seconds(char *code)
{
size_t length = strlen(code);
unsigned long long multiplier, retval;
char suffix, value[length];
if (length < 2)
return 0;
suffix = code[length - 1];
switch (suffix) {
case 's': multiplier = SEC_SECOND; break; /* 1 second */
case 'm': multiplier = SEC_MINUTE; break; /* 1 minute */
case 'h': multiplier = SEC_HOUR; break; /* 1 hour */
case 'D': multiplier = SEC_DAY; break; /* 1 day */
case 'M': multiplier = SEC_MONTH; break; /* 30.4368 days */
case 'Y': multiplier = SEC_YEAR; break; /* 365.242 days */
default: return 0;
}
strncpy(value, code, sizeof value);
value[sizeof value - 1] = '\0';
errno = 0;
retval = strtoul(value, NULL, 10) * multiplier; /* Possibly might overflow */
if (retval == ULONG_MAX && errno != 0)
error(1, errno, "Error converting time specifier %s", code);
return retval;
}
int main(int argc, char **argv)
{
bool blink = false;
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))
error(1, 0, "Error: stdout is not a tty");
if (argc < 2)
error(1, 0, "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)
error(1, errno, "Unable to set SIGWINCH signal action");
if (timer_create(CLOCK_MONOTONIC, &sev, &timerid) != 0)
error(1, errno, "Could not create timer");
if (sigemptyset(&sigset) != 0)
error(1, errno, "Could not empty signal set");
if (sigaddset(&sigset, SIGRTMIN) != 0)
error(1, errno, "Could not add SIGRTMIN to signal set");
if (sigprocmask(SIG_BLOCK, &sigset, NULL) != 0)
error(1, errno, "Could not block SIGRTMIN");
if (timer_settime(timerid, 0, &its, NULL) != 0)
error(1, errno, "Could not set timer");
sigwinch(SIGWINCH);
for (unsigned long long i = 0; i < total_seconds; i++)
for (int ii = 0; ii < 4; ii++) {
if (sigwait(&sigset, &sig), sig != SIGRTMIN)
error(1, 0, "sigwait returned unexpected signal %d", sig);
if (sigaddset(&sigset, SIGRTMIN) != 0)
error(1, errno, "Could not add SIGRTMIN to signal set");
clear_line();
print_time(total_seconds - i, ii < 2);
}
if (sigaddset(&sigset, SIGINT) != 0)
error(1, errno, "Could not add SIGINT to signal set");
while (true) {
blink = !blink;
sigwait(&sigset, &sig);
if (sig != SIGRTMIN)
break;
if (sigaddset(&sigset, SIGRTMIN) != 0)
error(1, errno, "Could not add SIGRTMIN to signal set");
clear_line();
if (blink)
printf(" -- BEEP -- \a\r");
if (fflush(stdout) != 0)
error(1, errno, "Failed to flush stdout");
}
timer_delete(timerid);
clear_line();
return 0;
}
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