+int read_vscreeninfo(const char *fbname, int *w, int *h)
+{
+ struct fb_var_screeninfo fbvar;
+ int ret, fd;
+
+ fd = open(fbname, O_RDWR);
+ if (fd == -1) {
+ err_perror("open %s", fbname);
+ return -1;
+ }
+
+ ret = ioctl(fd, FBIOGET_VSCREENINFO, &fbvar);
+ close(fd);
+
+ if (ret == -1) {
+ err_perror("ioctl %s", fbname);
+ return -1;
+ }
+
+ if (fbvar.xres == 0 || fbvar.yres == 0)
+ return -1;
+
+ *w = fbvar.xres;
+ *h = fbvar.yres;
+ return 0;
+}
+