usr.bin/systat/cmds.c

   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 = NULL;
 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 }