1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1980, 1992, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32
33
34#include <sys/param.h>
35
36#include <ctype.h>
37#include <signal.h>
38#include <stdlib.h>
39#include <string.h>
40#include <unistd.h>
41
42#include "systat.h"
43#include "extern.h"
44
45void
46command(const char *cmd)
47{
48	struct cmdtab *p;
49	char *cp, *tmpstr, *tmpstr1;
50	double t;
51
52	tmpstr = tmpstr1 = strdup(cmd);
53	for (cp = tmpstr1; *cp && !isspace(*cp); cp++)
54		;
55	if (*cp)
56		*cp++ = '\0';
57	if (*tmpstr1 == '\0')
58		goto done;
59	for (; *cp && isspace(*cp); cp++)
60		;
61	if (strcmp(tmpstr1, "quit") == 0 || strcmp(tmpstr1, "q") == 0)
62		die(0);
63	if (strcmp(tmpstr1, "load") == 0) {
64		load();
65		goto done;
66	}
67	if (strcmp(tmpstr1, "stop") == 0) {
68		delay = 0;
69		mvaddstr(CMDLINE, 0, "Refresh disabled.");
70		clrtoeol();
71		goto done;
72	}
73	if (strcmp(tmpstr1, "help") == 0) {
74		int _col, _len;
75
76		move(CMDLINE, _col = 0);
77		for (p = cmdtab; p->c_name; p++) {
78			_len = strlen(p->c_name);
79			if (_col + _len > COLS)
80				break;
81			addstr(p->c_name); _col += _len;
82			if (_col + 1 < COLS)
83				addch(' ');
84		}
85		clrtoeol();
86		goto done;
87	}
88	t = strtod(tmpstr1, NULL) * 1000000.0;
89	if (t > 0 && t < (double)UINT_MAX)
90		delay = (unsigned int)t;
91	if ((t <= 0 || t > (double)UINT_MAX) &&
92	    (strcmp(tmpstr1, "start") == 0 ||
93	    strcmp(tmpstr1, "interval") == 0)) {
94		if (*cp != '\0') {
95			t = strtod(cp, NULL) * 1000000.0;
96			if (t <= 0 || t >= (double)UINT_MAX) {
97				error("%d: bad interval.", (int)t);
98				goto done;
99			}
100		}
101	}
102	if (t > 0) {
103		delay = (unsigned int)t;
104		display();
105		status();
106		goto done;
107	}
108	p = lookup(tmpstr1);
109	if (p == (struct cmdtab *)-1) {
110		error("%s: Ambiguous command.", tmpstr1);
111		goto done;
112	}
113	if (p) {
114		if (curcmd == p)
115			goto done;
116		(*curcmd->c_close)(wnd);
117		curcmd->c_flags &= ~CF_INIT;
118		wnd = (*p->c_open)();
119		if (wnd == NULL) {
120			error("Couldn't open new display");
121			wnd = (*curcmd->c_open)();
122			if (wnd == NULL) {
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();
137		status();
138		goto done;
139	}
140	if (curcmd->c_cmd == NULL || !(*curcmd->c_cmd)(tmpstr1, cp))
141		error("%s: Unknown command.", tmpstr1);
142done:
143	free(tmpstr);
144}
145
146struct cmdtab *
147lookup(const char *name)
148{
149	const char *p, *q;
150	struct cmdtab *ct, *found;
151	int nmatches, longest;
152
153	longest = 0;
154	nmatches = 0;
155	found = (struct cmdtab *) 0;
156	for (ct = cmdtab; (p = ct->c_name); ct++) {
157		for (q = name; *q == *p++; q++)
158			if (*q == 0)		/* exact match? */
159				return (ct);
160		if (!*q) {			/* the name was a prefix */
161			if (q - name > longest) {
162				longest = q - name;
163				nmatches = 1;
164				found = ct;
165			} else if (q - name == longest)
166				nmatches++;
167		}
168	}
169	if (nmatches > 1)
170		return ((struct cmdtab *)-1);
171	return (found);
172}
173
174void
175status(void)
176{
177
178	error("Showing %s, refresh every %d seconds.",
179	  curcmd->c_name, delay / 1000000);
180}
181
182int
183prefix(const char *s1, const char *s2)
184{
185
186	while (*s1 == *s2) {
187		if (*s1 == '\0')
188			return (1);
189		s1++, s2++;
190	}
191	return (*s1 == '\0');
192}
193