xref: /dragonfly/usr.bin/systat/cmds.c (revision 19fe1c42)
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  * @(#)cmds.c	8.2 (Berkeley) 4/29/95
34  * $FreeBSD: src/usr.bin/systat/cmds.c,v 1.3 1999/08/28 01:05:58 peter Exp $
35  * $DragonFly: src/usr.bin/systat/cmds.c,v 1.6 2008/11/10 04:59:45 swildner Exp $
36  */
37 
38 #include <stdlib.h>
39 #include <unistd.h>
40 #include <signal.h>
41 #include <ctype.h>
42 #include <string.h>
43 #include "systat.h"
44 #include "extern.h"
45 
46 void
47 command(const char *cmd)
48 {
49         struct cmdtab *p;
50         char *cp;
51 	int omask;
52 	double interval;
53 
54 	omask = sigblock(sigmask(SIGALRM));
55         for (cp = __DECONST(char *, cmd); *cp && !isspace(*cp); cp++)
56                 ;
57         if (*cp)
58                 *cp++ = '\0';
59 	if (*cmd == '\0')
60 		return;
61 	for (; *cp && isspace(*cp); cp++)
62 		;
63         if (strcmp(cmd, "quit") == 0 || strcmp(cmd, "q") == 0)
64                 die(0);
65 	if (strcmp(cmd, "load") == 0) {
66 		load();
67 		goto done;
68 	}
69         if (strcmp(cmd, "stop") == 0) {
70                 alarm(0);
71                 mvaddstr(CMDLINE, 0, "Refresh disabled.");
72                 clrtoeol();
73 		goto done;
74         }
75 	if (strcmp(cmd, "help") == 0) {
76 		int _col, _len;
77 
78 		move(CMDLINE, _col = 0);
79 		for (p = cmdtab; p->c_name; p++) {
80 			_len = strlen(p->c_name);
81 			if (_col + _len > COLS)
82 				break;
83 			addstr(p->c_name); _col += _len;
84 			if (_col + 1 < COLS)
85 				addch(' ');
86 		}
87 		clrtoeol();
88 		goto done;
89 	}
90 	interval = strtod(cmd, NULL);
91         if (interval <= 0.0 &&
92 	    (strcmp(cmd, "start") == 0 || strcmp(cmd, "interval") == 0)) {
93 		interval = *cp ? strtod(cp, NULL) : naptime;
94                 if (interval <= 0.0) {
95 			error("%3.2f: bad interval.", interval);
96 			goto done;
97                 }
98 	}
99 	if (interval > 0.0) {
100                 alarm(0);
101                 naptime = interval;
102                 display(0);
103                 status();
104 		goto done;
105         }
106 	p = lookup(cmd);
107 	if (p == (struct cmdtab *)-1) {
108 		error("%s: Ambiguous command.", cmd);
109 		goto done;
110 	}
111         if (p) {
112                 if (curcmd == p)
113 			goto done;
114                 alarm(0);
115 		(*curcmd->c_close)(wnd);
116 		wnd = (*p->c_open)();
117 		if (wnd == 0) {
118 			error("Couldn't open new display");
119 			wnd = (*curcmd->c_open)();
120 			if (wnd == 0) {
121 				error("Couldn't change back to previous cmd");
122 				exit(1);
123 			}
124 			p = curcmd;
125 		}
126 		if ((p->c_flags & CF_INIT) == 0) {
127 			if ((*p->c_init)())
128 				p->c_flags |= CF_INIT;
129 			else
130 				goto done;
131 		}
132                 curcmd = p;
133 		labels();
134                 display(0);
135                 status();
136 		goto done;
137         }
138 	if (curcmd->c_cmd == 0 || !(*curcmd->c_cmd)(cmd, cp))
139 		error("%s: Unknown command.", cmd);
140 done:
141 	sigsetmask(omask);
142 }
143 
144 struct cmdtab *
145 lookup(const char *name)
146 {
147 	const char *p, *q;
148 	struct cmdtab *ct, *found;
149 	int nmatches, longest;
150 
151 	longest = 0;
152 	nmatches = 0;
153 	found = (struct cmdtab *) 0;
154 	for (ct = cmdtab; (p = ct->c_name); ct++) {
155 		for (q = name; *q == *p++; q++)
156 			if (*q == 0)		/* exact match? */
157 				return (ct);
158 		if (!*q) {			/* the name was a prefix */
159 			if (q - name > longest) {
160 				longest = q - name;
161 				nmatches = 1;
162 				found = ct;
163 			} else if (q - name == longest)
164 				nmatches++;
165 		}
166 	}
167 	if (nmatches > 1)
168 		return ((struct cmdtab *)-1);
169 	return (found);
170 }
171 
172 void
173 status(void)
174 {
175 
176         error("Showing %s, refresh every %3.2f seconds.",
177           curcmd->c_name, naptime);
178 }
179 
180 int
181 prefix(const char *s1, const char *s2)
182 {
183 
184         while (*s1 == *s2) {
185                 if (*s1 == '\0')
186                         return (1);
187                 s1++, s2++;
188         }
189         return (*s1 == '\0');
190 }
191