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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>
#define SEC_SECOND 1
#define SEC_MINUTE 60
#define SEC_HOUR 3600
#define SEC_DAY 86400
#define SEC_MONTH 2629746
#define SEC_YEAR 31556940
static const unsigned long interval_nsec = 1000000000 / 4;
unsigned short term_width = 0; /* Maybe volatile? */
void sigwinch(int sig) {
if (sig != SIGWINCH)
return;
struct winsize ws;
if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1)
error(1, errno, "Failed to get terminal width");
term_width = ws.ws_col;
}
unsigned long int get_seconds(char *code)
{
int length = strlen(code), multiplier = 0;
char suffix = code[length - 1], value[length + 1];
unsigned long retval;
if (length < 2) {
return 0;
}
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, length + 1);
value[length - 1] = '\0';
errno = 0;
retval = strtoul(value, NULL, 10) * multiplier;
if (retval == ULONG_MAX && errno != 0)
error(1, errno, "Error converting time specifier %s", code);
return retval;
}
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 print_time(unsigned long total_sec, bool show_colon)
{
unsigned long years, months, days, hours, minutes, seconds;
char colon = show_colon ? ':' : ' ', syears[128], smonths[16],
sdays[16];
years = total_sec / SEC_YEAR;
total_sec %= SEC_YEAR;
if (years == 1)
snprintf(syears, sizeof syears, "%lu year, ", years);
else if (years > 1)
snprintf(syears, sizeof syears, "%lu years, ", years);
else
syears[0] = '\0';
months = total_sec / SEC_MONTH;
total_sec %= SEC_MONTH;
if (months == 1)
snprintf(smonths, sizeof smonths, "%lu month, ", months);
else if (months > 1)
snprintf(smonths, sizeof smonths, "%lu months, ", months);
else
smonths[0] = '\0';
days = total_sec / SEC_DAY;
total_sec %= SEC_DAY;
if (days == 1)
snprintf(sdays, sizeof sdays, "%lu day, ", days);
else if (days > 1)
snprintf(sdays, sizeof sdays, "%lu days, ", days);
else
sdays[0] = '\0';
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, "An error occured during time formatting");
printf(" %s%s%s%.2lu%c%.2lu%c%.2lu\r", syears, smonths, sdays, hours,
colon, minutes, colon, seconds);
if (fflush(stdout) != 0)
error(1, errno, "Failed to flush stdout");
}
void usage(char *cmd)
{
printf("Usage:\n\t%s <n>{s,m,h,D,M,Y} ...\n", cmd);
}
int main(int argc, char **argv)
{
bool blink = false;
int sig;
sigset_t sigset;
struct itimerspec its;
struct sigevent sev;
struct sigaction sigact;
timer_t timerid;
unsigned long total_seconds = 0;
if (argc < 2) {
printf("Not enough arguments.\n");
usage(argv[0]);
exit(1);
}
for (int i = 1; i < argc; i++)
total_seconds += get_seconds(argv[i]);
sigact.sa_handler = sigwinch;
if (sigaction(SIGWINCH, &sigact, NULL) != 0)
error(1, errno, "Unable to set SIGWINCH signal action");
sev.sigev_notify = SIGEV_SIGNAL;
sev.sigev_signo = SIGRTMIN;
sev.sigev_value.sival_ptr = &timerid;
if (timer_create(CLOCK_MONOTONIC, &sev, &timerid) != 0)
error(1, errno, "Could not create timer");
its = (struct itimerspec){
{0, interval_nsec},
{0, interval_nsec}
};
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 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 signal to 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 signal to 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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