wmname.c - wmname - sets/prints window manager name similiar to hostname(1)
 (HTM) git clone git://git.suckless.org/wmname
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       ---
       wmname.c (1499B)
       ---
            1 /* See LICENSE file for details. */
            2 #include <stdarg.h>
            3 #include <stdlib.h>
            4 #include <stdio.h>
            5 #include <string.h>
            6 #include <X11/Xlib.h>
            7 #include <X11/Xatom.h>
            8 #include <X11/Xutil.h>
            9 
           10 void
           11 eprint(const char *errstr, ...) {
           12         va_list ap;
           13 
           14         va_start(ap, errstr);
           15         vfprintf(stderr, errstr, ap);
           16         va_end(ap);
           17         exit(EXIT_FAILURE);
           18 }
           19 
           20 int
           21 main(int argc, char **argv) {
           22         int status, format;
           23         unsigned char *data = NULL;
           24         unsigned long n, extra;
           25         Display *dpy;
           26         Window root;
           27         Atom netwmcheck, netwmname, utf8_string, real;
           28 
           29         if(argc > 2)
           30                 eprint("usage: wmname [name] [-v]\n");
           31         else if(argc == 2 && !strncmp(argv[1], "-v", 3))
           32                 eprint("wmname-"VERSION", © 2008-2013 Anselm R Garbe\n", stdout);
           33 
           34         if(!(dpy = XOpenDisplay(0)))
           35                 eprint("wmname: cannot open display\n");
           36         root = DefaultRootWindow(dpy);
           37         netwmcheck = XInternAtom(dpy, "_NET_SUPPORTING_WM_CHECK", False);
           38         netwmname = XInternAtom(dpy, "_NET_WM_NAME", False);
           39         utf8_string = XInternAtom(dpy, "UTF8_STRING", False);
           40         if(argc == 1) {
           41                 status = XGetWindowProperty(dpy, root, netwmname, 0L, 32L, False, utf8_string, &real, &format, &n, &extra, (unsigned char **) &data);
           42                 if(status == Success && data != NULL)
           43                         fprintf(stdout, "%s\n", data);
           44                 XFree(data);
           45         }
           46         else {
           47                 XChangeProperty(dpy, root, netwmcheck, XA_WINDOW, 32, PropModeReplace, (unsigned char *)&root, 1);
           48                 XChangeProperty(dpy, root, netwmname, utf8_string, 8, PropModeReplace, (unsigned char *)argv[1], strlen(argv[1]));
           49         }
           50         XSync(dpy, False);
           51         XCloseDisplay(dpy);
           52         return 0;
           53 }