cmds.c revision 216370 
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: head/usr.bin/systat/cmds.c 216370 2010-12-11 08:32:16Z joel $");
33
34#ifdef lint
35static const char sccsid[] = "@(#)cmds.c	8.2 (Berkeley) 4/29/95";
36#endif
37
38#include <ctype.h>
39#include <signal.h>
40#include <stdlib.h>
41#include <string.h>
42#include <unistd.h>
43
44#include "systat.h"
45#include "extern.h"
46
47void
48command(const char *cmd)
49{
50        struct cmdtab *p;
51        char *cp, *tmpstr, *tmpstr1;
52	int interval, omask;
53
54	tmpstr = tmpstr1 = strdup(cmd);
55	omask = sigblock(sigmask(SIGALRM));
56        for (cp = tmpstr1; *cp && !isspace(*cp); cp++)
57                ;
58        if (*cp)
59                *cp++ = '\0';
60	if (*tmpstr1 == '\0')
61		return;
62	for (; *cp && isspace(*cp); cp++)
63		;
64        if (strcmp(tmpstr1, "quit") == 0 || strcmp(tmpstr1, "q") == 0)
65                die(0);
66	if (strcmp(tmpstr1, "load") == 0) {
67		load();
68		goto done;
69	}
70        if (strcmp(tmpstr1, "stop") == 0) {
71                alarm(0);
72                mvaddstr(CMDLINE, 0, "Refresh disabled.");
73                clrtoeol();
74		goto done;
75        }
76	if (strcmp(tmpstr1, "help") == 0) {
77		int _col, _len;
78
79		move(CMDLINE, _col = 0);
80		for (p = cmdtab; p->c_name; p++) {
81			_len = strlen(p->c_name);
82			if (_col + _len > COLS)
83				break;
84			addstr(p->c_name); _col += _len;
85			if (_col + 1 < COLS)
86				addch(' ');
87		}
88		clrtoeol();
89		goto done;
90	}
91	interval = atoi(tmpstr1);
92        if (interval <= 0 &&
93	    (strcmp(tmpstr1, "start") == 0 || strcmp(tmpstr1, "interval") == 0)) {
94		interval = *cp ? atoi(cp) : naptime;
95                if (interval <= 0) {
96			error("%d: bad interval.", interval);
97			goto done;
98                }
99	}
100	if (interval > 0) {
101                alarm(0);
102                naptime = interval;
103                display(0);
104                status();
105		goto done;
106        }
107	p = lookup(tmpstr1);
108	if (p == (struct cmdtab *)-1) {
109		error("%s: Ambiguous command.", tmpstr1);
110		goto done;
111	}
112        if (p) {
113                if (curcmd == p)
114			goto done;
115                alarm(0);
116		(*curcmd->c_close)(wnd);
117		curcmd->c_flags &= ~CF_INIT;
118		wnd = (*p->c_open)();
119		if (wnd == 0) {
120			error("Couldn't open new display");
121			wnd = (*curcmd->c_open)();
122			if (wnd == 0) {
123				error("Couldn't change back to previous cmd");
124				exit(1);
125			}
126			p = curcmd;
127		}
128		if ((p->c_flags & CF_INIT) == 0) {
129			if ((*p->c_init)())
130				p->c_flags |= CF_INIT;
131			else
132				goto done;
133		}
134                curcmd = p;
135		labels();
136                display(0);
137                status();
138		goto done;
139        }
140	if (curcmd->c_cmd == 0 || !(*curcmd->c_cmd)(tmpstr1, cp))
141		error("%s: Unknown command.", tmpstr1);
142done:
143	sigsetmask(omask);
144	free(tmpstr);
145}
146
147struct cmdtab *
148lookup(const char *name)
149{
150	const char *p, *q;
151	struct cmdtab *ct, *found;
152	int nmatches, longest;
153
154	longest = 0;
155	nmatches = 0;
156	found = (struct cmdtab *) 0;
157	for (ct = cmdtab; (p = ct->c_name); ct++) {
158		for (q = name; *q == *p++; q++)
159			if (*q == 0)		/* exact match? */
160				return (ct);
161		if (!*q) {			/* the name was a prefix */
162			if (q - name > longest) {
163				longest = q - name;
164				nmatches = 1;
165				found = ct;
166			} else if (q - name == longest)
167				nmatches++;
168		}
169	}
170	if (nmatches > 1)
171		return ((struct cmdtab *)-1);
172	return (found);
173}
174
175void
176status(void)
177{
178
179        error("Showing %s, refresh every %d seconds.",
180          curcmd->c_name, naptime);
181}
182
183int
184prefix(const char *s1, const char *s2)
185{
186
187        while (*s1 == *s2) {
188                if (*s1 == '\0')
189                        return (1);
190                s1++, s2++;
191        }
192        return (*s1 == '\0');
193}
194