rndm_luser /xsetwmname.c

One of the resource configurations depends on this.
#include 
#include 
#include 

#include 
#include 
#include 

void
read_input(int argc, char **argv, unsigned char *buf, size_t buf_size)
{
    int i;

    memset(buf, '\0', sizeof buf_size);

    if (argc > 1) {
        int j, k;
        for (k = 0, i = 1; i < argc; i++) {
            for (j = 0; (k < (int) buf_size)
                    && (j < (int) strlen(argv[i])); j++, k++)
                buf[k] = argv[i][j];
            buf[k++] = ' ';
        }
    } else {
        int c;
        i = 0;
        while ((i < (int) buf_size) && ((c = getchar()) != EOF)) {
            if (c == '\n')
                continue;
            buf[i++] = c;
        }
    }
}

int
set_focused_wmname(unsigned char *title, size_t title_len)
{
    Display *display;
    Window window;
    XTextProperty text_prop;
    int unused_revert_to_return;

    if (!(display = XOpenDisplay(getenv("DISPLAY"))))
        return -1;

    XGetInputFocus(display, &window, &unused_revert_to_return);

    text_prop.value = title;
    text_prop.encoding = XA_STRING;
    text_prop.format = 8;
    text_prop.nitems = title_len;

    XSetWMName(display, window, &text_prop);
    XFlush(display);
    XCloseDisplay(display);

    return 0;
}

int
main(int argc, char **argv)
{
    unsigned char title[1024];

    read_input(argc, argv, &title, sizeof title);

    if (set_focused_wmname(title, sizeof title) == -1)
        exit(EXIT_FAILURE);

    exit(EXIT_SUCCESS);
}
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