Adding the main C file too.

xssstate.c

@@ -0,0 +1,106 @@
+/*
+ * See LICENSE file for copyright and license details.
+ */
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <libgen.h>
+#include <X11/extensions/scrnsaver.h>
+
+#include "arg.h"
+
+char *argv0;
+
+void
+die(const char *errstr, ...) {
+	va_list ap;
+
+	va_start(ap, errstr);
+	vfprintf(stderr, errstr, ap);
+	va_end(ap);
+	exit(EXIT_FAILURE);
+}
+
+void
+usage(void)
+{
+	die("usage: %s [-istv]\n", basename(argv0));
+}
+
+int
+main(int argc, char *argv[]) {
+	XScreenSaverInfo *info;
+	Display *dpy;
+	int base, errbase;
+	Bool showstate, showtill, showidle;
+
+	showstate = false;
+	showtill = false;
+	showidle = false;
+
+	ARGBEGIN {
+	case 'i':
+		showidle = true;
+		break;
+	case 's':
+		showstate = true;
+		break;
+	case 't':
+		showtill = true;
+		break;
+	case 'v':
+		die("xssstate-"VERSION", © 2008-2012 xssstate engineers"
+				", see LICENSE for details.\n");
+	default:
+		usage();
+	} ARGEND;
+
+	if (!showstate && !showtill && !showidle)
+		usage();
+
+	if (!(dpy = XOpenDisplay(0)))
+		die("Cannot open display.\n");
+
+	if (!XScreenSaverQueryExtension(dpy, &base, &errbase))
+		die("Screensaver extension not activated.\n");
+
+	info = XScreenSaverAllocInfo();
+	XScreenSaverQueryInfo(dpy, DefaultRootWindow(dpy), info);
+
+	if (showstate) {
+		switch(info->state) {
+		case ScreenSaverOn:
+			printf("on\n");
+			break;
+		case ScreenSaverOff:
+			printf("off\n");
+			break;
+		case ScreenSaverDisabled:
+			printf("disabled\n");
+			break;
+		}
+	} else if (showtill) {
+		switch(info->state) {
+		case ScreenSaverOn:
+			printf("0\n");
+			break;
+		case ScreenSaverOff:
+			printf("%ld\n", info->til_or_since);
+			break;
+		case ScreenSaverDisabled:
+			printf("-1\n");
+			break;
+		}
+	} else if (showidle) {
+		printf("%ld\n", info->idle);
+	}
+
+
+	XCloseDisplay(dpy);
+
+	return 0;
+}
+