xref: /freebsd/usr.bin/systat/cmds.c (revision ae83180158c4c937f170e31eff311b18c0286a93)
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("$FreeBSD$");
37 
38 #ifdef lint
39 static 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 
51 void
52 command(cmd)
53         const char *cmd;
54 {
55         struct cmdtab *p;
56         char *cp, *tmpstr, *tmpstr1;
57 	int interval, omask;
58 
59 	tmpstr = tmpstr1 = strdup(cmd);
60 	omask = sigblock(sigmask(SIGALRM));
61         for (cp = tmpstr1; *cp && !isspace(*cp); cp++)
62                 ;
63         if (*cp)
64                 *cp++ = '\0';
65 	if (*tmpstr1 == '\0')
66 		return;
67 	for (; *cp && isspace(*cp); cp++)
68 		;
69         if (strcmp(tmpstr1, "quit") == 0 || strcmp(tmpstr1, "q") == 0)
70                 die(0);
71 	if (strcmp(tmpstr1, "load") == 0) {
72 		load();
73 		goto done;
74 	}
75         if (strcmp(tmpstr1, "stop") == 0) {
76                 alarm(0);
77                 mvaddstr(CMDLINE, 0, "Refresh disabled.");
78                 clrtoeol();
79 		goto done;
80         }
81 	if (strcmp(tmpstr1, "help") == 0) {
82 		int _col, _len;
83 
84 		move(CMDLINE, _col = 0);
85 		for (p = cmdtab; p->c_name; p++) {
86 			_len = strlen(p->c_name);
87 			if (_col + _len > COLS)
88 				break;
89 			addstr(p->c_name); _col += _len;
90 			if (_col + 1 < COLS)
91 				addch(' ');
92 		}
93 		clrtoeol();
94 		goto done;
95 	}
96 	interval = atoi(tmpstr1);
97         if (interval <= 0 &&
98 	    (strcmp(tmpstr1, "start") == 0 || strcmp(tmpstr1, "interval") == 0)) {
99 		interval = *cp ? atoi(cp) : naptime;
100                 if (interval <= 0) {
101 			error("%d: bad interval.", interval);
102 			goto done;
103                 }
104 	}
105 	if (interval > 0) {
106                 alarm(0);
107                 naptime = interval;
108                 display(0);
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                 alarm(0);
121 		(*curcmd->c_close)(wnd);
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);
146 done:
147 	sigsetmask(omask);
148 	free(tmpstr);
149 }
150 
151 struct cmdtab *
152 lookup(name)
153 	const char *name;
154 {
155 	const char *p, *q;
156 	struct cmdtab *ct, *found;
157 	int nmatches, longest;
158 
159 	longest = 0;
160 	nmatches = 0;
161 	found = (struct cmdtab *) 0;
162 	for (ct = cmdtab; (p = ct->c_name); ct++) {
163 		for (q = name; *q == *p++; q++)
164 			if (*q == 0)		/* exact match? */
165 				return (ct);
166 		if (!*q) {			/* the name was a prefix */
167 			if (q - name > longest) {
168 				longest = q - name;
169 				nmatches = 1;
170 				found = ct;
171 			} else if (q - name == longest)
172 				nmatches++;
173 		}
174 	}
175 	if (nmatches > 1)
176 		return ((struct cmdtab *)-1);
177 	return (found);
178 }
179 
180 void
181 status()
182 {
183 
184         error("Showing %s, refresh every %d seconds.",
185           curcmd->c_name, naptime);
186 }
187 
188 int
189 prefix(s1, s2)
190         const char *s1, *s2;
191 {
192 
193         while (*s1 == *s2) {
194                 if (*s1 == '\0')
195                         return (1);
196                 s1++, s2++;
197         }
198         return (*s1 == '\0');
199 }
200