dwm/patch/fsignal.c

int
fake_signal(void)
{
	char fsignal[256];
	char indicator[9] = "fsignal:";
	char str_signum[16];
	int i, v, signum;
	size_t len_fsignal, len_indicator = strlen(indicator);

	// Get root name property
	if (gettextprop(root, XA_WM_NAME, fsignal, sizeof(fsignal))) {
		len_fsignal = strlen(fsignal);

		// Check if this is indeed a fake signal
		if (len_indicator > len_fsignal ? 0 : strncmp(indicator, fsignal, len_indicator) == 0) {
			memcpy(str_signum, &fsignal[len_indicator], len_fsignal - len_indicator);
			str_signum[len_fsignal - len_indicator] = '\0';

			// Convert string value into managable integer
			for (i = signum = 0; i < strlen(str_signum); i++) {
				v = str_signum[i] - '0';
				if (v >= 0 && v <= 9) {
					signum = signum * 10 + v;
				}
			}

			// Check if a signal was found, and if so handle it
			if (signum)
				for (i = 0; i < LENGTH(signals); i++)
					if (signum == signals[i].signum && signals[i].func)
						signals[i].func(&(signals[i].arg));

			// A fake signal was sent
			return 1;
		}
	}

	// No fake signal was sent, so proceed with update
	return 0;
}