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If scrolling support is not compiled in the kernel, fail gracefully.

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This commit is contained in:
christos 2004-06-03 19:18:41 +00:00
parent 6a5f1d6689
commit 67ec024858
1 changed files with 40 additions and 18 deletions
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58
sbin/wsconsctl/display.c
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@ -1,4 +1,4 @@
/* $NetBSD: display.c,v 1.3 2004/05/28 21:44:15 christos Exp $ */
/* $NetBSD: display.c,v 1.4 2004/06/03 19:18:41 christos Exp $ */
/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
@ -37,15 +37,21 @@
*/
#include <sys/ioctl.h>
#include <stdio.h>
#include <sys/time.h>
#include <dev/wscons/wsconsio.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <err.h>
#include <dev/wscons/wsconsio.h>
#include "wsconsctl.h"
static int dpytype;
static struct wsdisplay_usefontdata font;
static struct wsdisplay_scroll_data scroll_l;
static int havescroll = 1;
struct field display_field_tab[] = {
{ "type", &dpytype, FMT_DPYTYPE, FLG_RDONLY },
@ -57,6 +63,19 @@ struct field display_field_tab[] = {
int display_field_tab_len = sizeof(display_field_tab)/
sizeof(display_field_tab[0]);
static int
init_values(void)
{
scroll_l.which = 0;
if (field_by_value(&scroll_l.fastlines)->flags & FLG_GET)
scroll_l.which |= WSDISPLAY_SCROLL_DOFASTLINES;
if (field_by_value(&scroll_l.slowlines)->flags & FLG_GET)
scroll_l.which |= WSDISPLAY_SCROLL_DOSLOWLINES;
return scroll_l.which;
}
void
display_get_values(fd)
int fd;
@ -65,14 +84,15 @@ display_get_values(fd)
if (ioctl(fd, WSDISPLAYIO_GTYPE, &dpytype) < 0)
err(1, "WSDISPLAYIO_GTYPE");
scroll_l.which = 0;
if (field_by_value(&scroll_l.fastlines)->flags & FLG_GET)
scroll_l.which |= WSDISPLAY_SCROLL_DOFASTLINES;
if (field_by_value(&scroll_l.slowlines)->flags & FLG_GET)
scroll_l.which |= WSDISPLAY_SCROLL_DOSLOWLINES;
if (scroll_l.which != 0 &&
ioctl(fd, WSDISPLAYIO_DGSCROLL, &scroll_l) < 0)
if (init_values() == 0 || havescroll == 0)
return;
if (ioctl(fd, WSDISPLAYIO_DGSCROLL, &scroll_l) < 0) {
if (errno != ENODEV)
err(1, "WSDISPLAYIO_GSCROLL");
else
havescroll = 0;
}
}
void
@ -85,18 +105,20 @@ display_put_values(fd)
pr_field(field_by_value(&font.name), " -> ");
}
scroll_l.which = 0;
if (field_by_value(&scroll_l.fastlines)->flags & FLG_SET)
scroll_l.which |= WSDISPLAY_SCROLL_DOFASTLINES;
if (field_by_value(&scroll_l.slowlines)->flags & FLG_SET)
scroll_l.which |= WSDISPLAY_SCROLL_DOSLOWLINES;
if (init_values() == 0 || havescroll == 0)
return;
if (scroll_l.which & WSDISPLAY_SCROLL_DOFASTLINES)
pr_field(field_by_value(&scroll_l.fastlines), " -> ");
if (scroll_l.which & WSDISPLAY_SCROLL_DOSLOWLINES)
pr_field(field_by_value(&scroll_l.slowlines), " -> ");
if (scroll_l.which != 0 &&
ioctl(fd, WSDISPLAYIO_DSSCROLL, &scroll_l) < 0)
err (1, "WSDISPLAYIO_SSCROLL");
if (ioctl(fd, WSDISPLAYIO_DSSCROLL, &scroll_l) < 0) {
if (errno != ENODEV)
err (1, "WSDISPLAYIO_DSSCROLL");
else {
warnx("scrolling is not supported by this kernel");
havescroll = 0;
}
}
}