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/*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
*(at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* 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 <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <time.h>
#include <X11/Xlib.h>
#define MAXLENGTH 256
int binary = 1; /* 0 = decimal display, 1 = binary display */
int miltime = 0; /* 0 = 12 hour time, 1 = 24 hour time */
int
dectobin(int dec)
{
if (dec == 0) return 0;
if (dec == 1) return 1;
return (dec % 2) + 10 * dectobin(dec / 2);
}
void
gettime(int *store)
{
time_t t = time(NULL);
struct tm *tm = localtime(&t);
store[0] = tm->tm_hour;
store[1] = tm->tm_min;
}
void
formatstring(char *status, int *time)
{
if (binary)
{
snprintf(status, MAXLENGTH, "%05d %06d", dectobin(time[0]),
dectobin(time[1]));
}
else
{
snprintf(status, MAXLENGTH, "%02d:%02d", time[0], time[1]);
}
}
int
converthour(int hour)
{
// is there a better way?
switch (hour)
{
case 0: return 12;
case 13: return 1;
case 14: return 2;
case 15: return 3;
case 16: return 4;
case 17: return 5;
case 18: return 6;
case 19: return 7;
case 20: return 8;
case 21: return 9;
case 22: return 10;
case 23: return 11;
default: return hour;
}
}
int
main(int argc, char *argv[])
{
for (int c = 1; c < argc; c++)
{
if (argc >= 2)
{
if (strcmp(argv[c], "-d") == 0)
binary = 0;
else if (strcmp(argv[c], "-m") == 0)
miltime = 1;
else
{
printf("usage: %s [-d] [-m]\n-d: decimal output\n"
"-m: 24-hour format\n", argv[0]);
exit(EXIT_SUCCESS);
}
}
}
int exitflag = EXIT_SUCCESS;
char status[MAXLENGTH];
int time[2];
Display *dsp = XOpenDisplay(NULL);
if(!dsp)
{
fprintf(stderr, "cannot open X display\n");
exit(EXIT_FAILURE);
}
while (1)
{
gettime(time);
if (!miltime && time[0] > 12)
time[0] = converthour(time[0]);
formatstring(status, time);
XStoreName(dsp, DefaultRootWindow(dsp), status);
XFlush(dsp);
sleep(1);
}
XCloseDisplay(dsp);
return exitflag;
}
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