NetBSD/usr.bin/systat/cmds.c

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/* $NetBSD: cmds.c,v 1.8 1997/10/19 23:36:21 lukem Exp $ */
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/*-
* Copyright (c) 1980, 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS 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.
*/
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#include <sys/cdefs.h>
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#ifndef lint
#if 0
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static char sccsid[] = "@(#)cmds.c 8.2 (Berkeley) 4/29/95";
#endif
__RCSID("$NetBSD: cmds.c,v 1.8 1997/10/19 23:36:21 lukem Exp $");
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#endif /* not lint */
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <ctype.h>
#include <string.h>
#include "systat.h"
#include "extern.h"
void
command(cmd)
char *cmd;
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{
struct cmdtab *p;
char *cp;
int interval;
sigset_t set;
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sigemptyset(&set);
sigaddset(&set, SIGALRM);
sigprocmask(SIG_BLOCK, &set, NULL);
for (cp = cmd; *cp && !isspace(*cp); cp++)
;
if (*cp)
*cp++ = '\0';
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if (*cmd == '\0')
return;
for (; *cp && isspace(*cp); cp++)
;
if (strcmp(cmd, "quit") == 0 || strcmp(cmd, "q") == 0)
die(0);
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if (strcmp(cmd, "load") == 0) {
load();
goto done;
}
if (strcmp(cmd, "stop") == 0) {
alarm(0);
mvaddstr(CMDLINE, 0, "Refresh disabled.");
clrtoeol();
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goto done;
}
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if (strcmp(cmd, "help") == 0) {
int col, len;
move(CMDLINE, col = 0);
for (p = cmdtab; p->c_name; p++) {
len = strlen(p->c_name);
if (col + len > COLS)
break;
addstr(p->c_name); col += len;
if (col + 1 < COLS)
addch(' ');
}
clrtoeol();
goto done;
}
interval = atoi(cmd);
if (interval <= 0 &&
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(strcmp(cmd, "start") == 0 || strcmp(cmd, "interval") == 0)) {
interval = *cp ? atoi(cp) : naptime;
if (interval <= 0) {
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error("%d: bad interval.", interval);
goto done;
}
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}
if (interval > 0) {
alarm(0);
naptime = interval;
display(0);
status();
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goto done;
}
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p = lookup(cmd);
if (p == (struct cmdtab *)-1) {
error("%s: Ambiguous command.", cmd);
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goto done;
}
if (p) {
if (curcmd == p)
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goto done;
alarm(0);
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(*curcmd->c_close)(wnd);
wnd = (*p->c_open)();
if (wnd == 0) {
error("Couldn't open new display");
wnd = (*curcmd->c_open)();
if (wnd == 0) {
error("Couldn't change back to previous cmd");
exit(1);
}
p = curcmd;
}
if ((p->c_flags & CF_INIT) == 0) {
if ((*p->c_init)())
p->c_flags |= CF_INIT;
else
goto done;
}
curcmd = p;
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labels();
display(0);
status();
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goto done;
}
if (curcmd->c_cmd == 0 || !(*curcmd->c_cmd)(cmd, cp))
error("%s: Unknown command.", cmd);
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done:
sigprocmask(SIG_UNBLOCK, &set, NULL);
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}
struct cmdtab *
lookup(name)
char *name;
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{
char *p, *q;
struct cmdtab *c, *found;
int nmatches, longest;
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longest = 0;
nmatches = 0;
found = (struct cmdtab *) 0;
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for (c = cmdtab; (p = c->c_name); c++) {
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for (q = name; *q == *p++; q++)
if (*q == 0) /* exact match? */
return (c);
if (!*q) { /* the name was a prefix */
if (q - name > longest) {
longest = q - name;
nmatches = 1;
found = c;
} else if (q - name == longest)
nmatches++;
}
}
if (nmatches > 1)
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return ((struct cmdtab *)-1);
return (found);
}
void
status()
{
error("Showing %s, refresh every %d seconds.", curcmd->c_name, naptime);
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}
int
prefix(s1, s2)
char *s1, *s2;
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{
while (*s1 == *s2) {
if (*s1 == '\0')
return (1);
s1++, s2++;
}
return (*s1 == '\0');
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}