cmds.c revision 175387 
1/*-
2 * Copyright (c) 1980, 1992, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include <sys/cdefs.h>
35
36__FBSDID("$FreeBSD: head/usr.bin/systat/cmds.c 175387 2008-01-16 19:27:43Z delphij $");
37
38#ifdef lint
39static const char sccsid[] = "@(#)cmds.c	8.2 (Berkeley) 4/29/95";
40#endif
41
42#include <ctype.h>
43#include <signal.h>
44#include <stdlib.h>
45#include <string.h>
46#include <unistd.h>
47
48#include "systat.h"
49#include "extern.h"
50
51void
52command(const char *cmd)
53{
54        struct cmdtab *p;
55        char *cp, *tmpstr, *tmpstr1;
56	int interval, omask;
57
58	tmpstr = tmpstr1 = strdup(cmd);
59	omask = sigblock(sigmask(SIGALRM));
60        for (cp = tmpstr1; *cp && !isspace(*cp); cp++)
61                ;
62        if (*cp)
63                *cp++ = '\0';
64	if (*tmpstr1 == '\0')
65		return;
66	for (; *cp && isspace(*cp); cp++)
67		;
68        if (strcmp(tmpstr1, "quit") == 0 || strcmp(tmpstr1, "q") == 0)
69                die(0);
70	if (strcmp(tmpstr1, "load") == 0) {
71		load();
72		goto done;
73	}
74        if (strcmp(tmpstr1, "stop") == 0) {
75                alarm(0);
76                mvaddstr(CMDLINE, 0, "Refresh disabled.");
77                clrtoeol();
78		goto done;
79        }
80	if (strcmp(tmpstr1, "help") == 0) {
81		int _col, _len;
82
83		move(CMDLINE, _col = 0);
84		for (p = cmdtab; p->c_name; p++) {
85			_len = strlen(p->c_name);
86			if (_col + _len > COLS)
87				break;
88			addstr(p->c_name); _col += _len;
89			if (_col + 1 < COLS)
90				addch(' ');
91		}
92		clrtoeol();
93		goto done;
94	}
95	interval = atoi(tmpstr1);
96        if (interval <= 0 &&
97	    (strcmp(tmpstr1, "start") == 0 || strcmp(tmpstr1, "interval") == 0)) {
98		interval = *cp ? atoi(cp) : naptime;
99                if (interval <= 0) {
100			error("%d: bad interval.", interval);
101			goto done;
102                }
103	}
104	if (interval > 0) {
105                alarm(0);
106                naptime = interval;
107                display(0);
108                status();
109		goto done;
110        }
111	p = lookup(tmpstr1);
112	if (p == (struct cmdtab *)-1) {
113		error("%s: Ambiguous command.", tmpstr1);
114		goto done;
115	}
116        if (p) {
117                if (curcmd == p)
118			goto done;
119                alarm(0);
120		(*curcmd->c_close)(wnd);
121		curcmd->c_flags &= ~CF_INIT;
122		wnd = (*p->c_open)();
123		if (wnd == 0) {
124			error("Couldn't open new display");
125			wnd = (*curcmd->c_open)();
126			if (wnd == 0) {
127				error("Couldn't change back to previous cmd");
128				exit(1);
129			}
130			p = curcmd;
131		}
132		if ((p->c_flags & CF_INIT) == 0) {
133			if ((*p->c_init)())
134				p->c_flags |= CF_INIT;
135			else
136				goto done;
137		}
138                curcmd = p;
139		labels();
140                display(0);
141                status();
142		goto done;
143        }
144	if (curcmd->c_cmd == 0 || !(*curcmd->c_cmd)(tmpstr1, cp))
145		error("%s: Unknown command.", tmpstr1);
146done:
147	sigsetmask(omask);
148	free(tmpstr);
149}
150
151struct cmdtab *
152lookup(const char *name)
153{
154	const char *p, *q;
155	struct cmdtab *ct, *found;
156	int nmatches, longest;
157
158	longest = 0;
159	nmatches = 0;
160	found = (struct cmdtab *) 0;
161	for (ct = cmdtab; (p = ct->c_name); ct++) {
162		for (q = name; *q == *p++; q++)
163			if (*q == 0)		/* exact match? */
164				return (ct);
165		if (!*q) {			/* the name was a prefix */
166			if (q - name > longest) {
167				longest = q - name;
168				nmatches = 1;
169				found = ct;
170			} else if (q - name == longest)
171				nmatches++;
172		}
173	}
174	if (nmatches > 1)
175		return ((struct cmdtab *)-1);
176	return (found);
177}
178
179void
180status(void)
181{
182
183        error("Showing %s, refresh every %d seconds.",
184          curcmd->c_name, naptime);
185}
186
187int
188prefix(const char *s1, const char *s2)
189{
190
191        while (*s1 == *s2) {
192                if (*s1 == '\0')
193                        return (1);
194                s1++, s2++;
195        }
196        return (*s1 == '\0');
197}
198