freebsd-dev/usr.bin/systat/cmds.c
Alexander V. Chernikov 8b3daf895a Make systat(1) accept fractional number of seconds.
Make old alarm(3)-based code use select(2).

MFC after:	2 weeks
2012-09-17 13:36:47 +00:00

197 lines
4.7 KiB
C

/*-
* 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.
* 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#ifdef lint
static const char sccsid[] = "@(#)cmds.c 8.2 (Berkeley) 4/29/95";
#endif
#include <sys/param.h>
#include <ctype.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "systat.h"
#include "extern.h"
void
command(const char *cmd)
{
struct cmdtab *p;
char *cp, *tmpstr, *tmpstr1;
double t;
tmpstr = tmpstr1 = strdup(cmd);
for (cp = tmpstr1; *cp && !isspace(*cp); cp++)
;
if (*cp)
*cp++ = '\0';
if (*tmpstr1 == '\0')
return;
for (; *cp && isspace(*cp); cp++)
;
if (strcmp(tmpstr1, "quit") == 0 || strcmp(tmpstr1, "q") == 0)
die(0);
if (strcmp(tmpstr1, "load") == 0) {
load();
goto done;
}
if (strcmp(tmpstr1, "stop") == 0) {
delay = 0;
mvaddstr(CMDLINE, 0, "Refresh disabled.");
clrtoeol();
goto done;
}
if (strcmp(tmpstr1, "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;
}
t = strtod(tmpstr1, NULL) * 1000000.0;
if (t > 0 && t < (double)UINT_MAX)
delay = (unsigned int)t;
if ((t <= 0 || t > (double)UINT_MAX) &&
(strcmp(tmpstr1, "start") == 0 ||
strcmp(tmpstr1, "interval") == 0)) {
if (*cp != '\0') {
t = strtod(cp, NULL) * 1000000.0;
if (t <= 0 || t >= (double)UINT_MAX) {
error("%d: bad interval.", (int)t);
goto done;
}
}
}
if (t > 0) {
delay = (unsigned int)t;
display();
status();
goto done;
}
p = lookup(tmpstr1);
if (p == (struct cmdtab *)-1) {
error("%s: Ambiguous command.", tmpstr1);
goto done;
}
if (p) {
if (curcmd == p)
goto done;
(*curcmd->c_close)(wnd);
curcmd->c_flags &= ~CF_INIT;
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;
labels();
display();
status();
goto done;
}
if (curcmd->c_cmd == 0 || !(*curcmd->c_cmd)(tmpstr1, cp))
error("%s: Unknown command.", tmpstr1);
done:
free(tmpstr);
}
struct cmdtab *
lookup(const char *name)
{
const char *p, *q;
struct cmdtab *ct, *found;
int nmatches, longest;
longest = 0;
nmatches = 0;
found = (struct cmdtab *) 0;
for (ct = cmdtab; (p = ct->c_name); ct++) {
for (q = name; *q == *p++; q++)
if (*q == 0) /* exact match? */
return (ct);
if (!*q) { /* the name was a prefix */
if (q - name > longest) {
longest = q - name;
nmatches = 1;
found = ct;
} else if (q - name == longest)
nmatches++;
}
}
if (nmatches > 1)
return ((struct cmdtab *)-1);
return (found);
}
void
status(void)
{
error("Showing %s, refresh every %d seconds.",
curcmd->c_name, delay / 1000000);
}
int
prefix(const char *s1, const char *s2)
{
while (*s1 == *s2) {
if (*s1 == '\0')
return (1);
s1++, s2++;
}
return (*s1 == '\0');
}