cmds.c revision 331722 
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 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#include <sys/cdefs.h>
31
32__FBSDID("$FreeBSD: stable/11/usr.bin/systat/cmds.c 331722 2018-03-29 02:50:57Z eadler $");
33
34#ifdef lint
35static const char sccsid[] = "@(#)cmds.c	8.2 (Berkeley) 4/29/95";
36#endif
37
38#include <sys/param.h>
39
40#include <ctype.h>
41#include <signal.h>
42#include <stdlib.h>
43#include <string.h>
44#include <unistd.h>
45
46#include "systat.h"
47#include "extern.h"
48
49void
50command(const char *cmd)
51{
52	struct cmdtab *p;
53	char *cp, *tmpstr, *tmpstr1;
54	double t;
55
56	tmpstr = tmpstr1 = strdup(cmd);
57	for (cp = tmpstr1; *cp && !isspace(*cp); cp++)
58		;
59	if (*cp)
60		*cp++ = '\0';
61	if (*tmpstr1 == '\0')
62		return;
63	for (; *cp && isspace(*cp); cp++)
64		;
65	if (strcmp(tmpstr1, "quit") == 0 || strcmp(tmpstr1, "q") == 0)
66		die(0);
67	if (strcmp(tmpstr1, "load") == 0) {
68		load();
69		goto done;
70	}
71	if (strcmp(tmpstr1, "stop") == 0) {
72		delay = 0;
73		mvaddstr(CMDLINE, 0, "Refresh disabled.");
74		clrtoeol();
75		goto done;
76	}
77	if (strcmp(tmpstr1, "help") == 0) {
78		int _col, _len;
79
80		move(CMDLINE, _col = 0);
81		for (p = cmdtab; p->c_name; p++) {
82			_len = strlen(p->c_name);
83			if (_col + _len > COLS)
84				break;
85			addstr(p->c_name); _col += _len;
86			if (_col + 1 < COLS)
87				addch(' ');
88		}
89		clrtoeol();
90		goto done;
91	}
92	t = strtod(tmpstr1, NULL) * 1000000.0;
93	if (t > 0 && t < (double)UINT_MAX)
94		delay = (unsigned int)t;
95	if ((t <= 0 || t > (double)UINT_MAX) &&
96	    (strcmp(tmpstr1, "start") == 0 ||
97	    strcmp(tmpstr1, "interval") == 0)) {
98		if (*cp != '\0') {
99			t = strtod(cp, NULL) * 1000000.0;
100			if (t <= 0 || t >= (double)UINT_MAX) {
101				error("%d: bad interval.", (int)t);
102				goto done;
103			}
104		}
105	}
106	if (t > 0) {
107		delay = (unsigned int)t;
108		display();
109		status();
110		goto done;
111	}
112	p = lookup(tmpstr1);
113	if (p == (struct cmdtab *)-1) {
114		error("%s: Ambiguous command.", tmpstr1);
115		goto done;
116	}
117	if (p) {
118		if (curcmd == p)
119			goto done;
120		(*curcmd->c_close)(wnd);
121		curcmd->c_flags &= ~CF_INIT;
122		wnd = (*p->c_open)();
123		if (wnd == NULL) {
124			error("Couldn't open new display");
125			wnd = (*curcmd->c_open)();
126			if (wnd == NULL) {
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();
141		status();
142		goto done;
143	}
144	if (curcmd->c_cmd == NULL || !(*curcmd->c_cmd)(tmpstr1, cp))
145		error("%s: Unknown command.", tmpstr1);
146done:
147	free(tmpstr);
148}
149
150struct cmdtab *
151lookup(const char *name)
152{
153	const char *p, *q;
154	struct cmdtab *ct, *found;
155	int nmatches, longest;
156
157	longest = 0;
158	nmatches = 0;
159	found = (struct cmdtab *) 0;
160	for (ct = cmdtab; (p = ct->c_name); ct++) {
161		for (q = name; *q == *p++; q++)
162			if (*q == 0)		/* exact match? */
163				return (ct);
164		if (!*q) {			/* the name was a prefix */
165			if (q - name > longest) {
166				longest = q - name;
167				nmatches = 1;
168				found = ct;
169			} else if (q - name == longest)
170				nmatches++;
171		}
172	}
173	if (nmatches > 1)
174		return ((struct cmdtab *)-1);
175	return (found);
176}
177
178void
179status(void)
180{
181
182	error("Showing %s, refresh every %d seconds.",
183	  curcmd->c_name, delay / 1000000);
184}
185
186int
187prefix(const char *s1, const char *s2)
188{
189
190	while (*s1 == *s2) {
191		if (*s1 == '\0')
192			return (1);
193		s1++, s2++;
194	}
195	return (*s1 == '\0');
196}
197