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
command(const char * cmd)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 *
lookup(const char * name)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
status(void)175 status(void)
176 {
177
178 error("Showing %s, refresh every %d seconds.",
179 curcmd->c_name, delay / 1000000);
180 }
181
182 int
prefix(const char * s1,const char * s2)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