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+/*
+ * Copyright 1997 Massachusetts Institute of Technology
+ *
+ * Permission to use, copy, modify, and distribute this software and
+ * its documentation for any purpose and without fee is hereby
+ * granted, provided that both the above copyright notice and this
+ * permission notice appear in all copies, that both the above
+ * copyright notice and this permission notice appear in all
+ * supporting documentation, and that the name of M.I.T. not be used
+ * in advertising or publicity pertaining to distribution of the
+ * software without specific, written prior permission. M.I.T. makes
+ * no representations about the suitability of this software for any
+ * purpose. It is provided "as is" without express or implied
+ * warranty.
+ *
+ * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
+ * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
+ * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * mode.c - mechanisms for dealing with SGI-style modal displays.
+ *
+ * There are four generally-understood useful modes for status displays
+ * of the sort exemplified by the IRIX ``netstat -C'' and ``osview''
+ * programs. We try to follow their example, although the user interface
+ * and terminology slightly differ.
+ *
+ * RATE - the default mode - displays the precise rate of change in
+ * each statistic in units per second, regardless of the actual display
+ * update interval.
+ *
+ * DELTA - displays the change in each statistic over the entire
+ * display update interval (i.e., RATE * interval).
+ *
+ * SINCE - displays the total change in each statistic since the module
+ * was last initialized or reset.
+ *
+ * ABSOLUTE - displays the current value of each statistic.
+ *
+ * In the SGI programs, these modes are selected by the single-character
+ * commands D, W, N, and A. In systat, they are the slightly-harder-to-type
+ * ``mode delta'', etc. The initial value for SINCE mode is initialized
+ * when the module is first started and can be reset using the ``reset''
+ * command (as opposed to the SGI way where changing modes implicitly
+ * resets). A ``mode'' command with no arguments displays the current
+ * mode in the command line.
+ */
+
+
+#include <sys/types.h>
+
+#include "systat.h"
+#include "extern.h"
+#include "mode.h"
+
+enum mode currentmode = display_RATE;
+
+static const char *const modes[] = { "rate", "delta", "since", "absolute" };
+
+int
+cmdmode(const char *cmd, const char *args)
+{
+ if (prefix(cmd, "mode")) {
+ if (args[0] == '\0') {
+ move(CMDLINE, 0);
+ clrtoeol();
+ printw("%s", modes[currentmode]);
+ } else if (prefix(args, "rate")) {
+ currentmode = display_RATE;
+ } else if (prefix(args, "delta")) {
+ currentmode = display_DELTA;
+ } else if (prefix(args, "since")) {
+ currentmode = display_SINCE;
+ } else if (prefix(args, "absolute")) {
+ currentmode = display_ABS;
+ } else {
+ printw("unknown mode `%s'", args);
+ }
+ return 1;
+ }
+ if(prefix(cmd, "reset")) {
+ curcmd->c_reset();
+ return 1;
+ }
+ return 0;
+}