xref: /freebsd/usr.bin/systat/cmds.c (revision 4b9d6057)
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 
45 void
46 command(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);
142 done:
143 	free(tmpstr);
144 }
145 
146 struct cmdtab *
147 lookup(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 
174 void
175 status(void)
176 {
177 
178 	error("Showing %s, refresh every %d seconds.",
179 	  curcmd->c_name, delay / 1000000);
180 }
181 
182 int
183 prefix(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