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. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#)cmds.c   8.2 (Berkeley) 4/29/95
  30  * $FreeBSD: src/usr.bin/systat/cmds.c,v 1.3 1999/08/28 01:05:58 peter Exp $
  31  * $DragonFly: src/usr.bin/systat/cmds.c,v 1.6 2008/11/10 04:59:45 swildner Exp $
  32  */
  33
  34 #include <stdlib.h>
  35 #include <unistd.h>
  36 #include <signal.h>
  37 #include <ctype.h>
  38 #include <string.h>
  39 #include "systat.h"
  40 #include "extern.h"
  41
  42 void
  43 command(const char *cmd)
  44 {
  45         struct cmdtab *p;
  46         char *cp;
  47         int omask;
  48         double interval;
  49
  50         omask = sigblock(sigmask(SIGALRM));
  51         for (cp = __DECONST(char *, cmd); *cp && !isspace(*cp); cp++)
  52                 ;
  53         if (*cp)
  54                 *cp++ = '\0';
  55         if (*cmd == '\0')
  56                 return;
  57         for (; *cp && isspace(*cp); cp++)
  58                 ;
  59         if (strcmp(cmd, "quit") == 0 || strcmp(cmd, "q") == 0)
  60                 die(0);
  61         if (strcmp(cmd, "load") == 0) {
  62                 load();
  63                 goto done;
  64         }
  65         if (strcmp(cmd, "stop") == 0) {
  66                 alarm(0);
  67                 mvaddstr(CMDLINE, 0, "Refresh disabled.");
  68                 clrtoeol();
  69                 goto done;
  70         }
  71         if (strcmp(cmd, "help") == 0) {
  72                 int _col, _len;
  73
  74                 move(CMDLINE, _col = 0);
  75                 for (p = cmdtab; p->c_name; p++) {
  76                         _len = strlen(p->c_name);
  77                         if (_col + _len > COLS)
  78                                 break;
  79                         addstr(p->c_name); _col += _len;
  80                         if (_col + 1 < COLS)
  81                                 addch(' ');
  82                 }
  83                 clrtoeol();
  84                 goto done;
  85         }
  86         interval = strtod(cmd, NULL);
  87         if (interval <= 0.0 &&
  88             (strcmp(cmd, "start") == 0 || strcmp(cmd, "interval") == 0)) {
  89                 interval = *cp ? strtod(cp, NULL) : naptime;
  90                 if (interval <= 0.0) {
  91                         error("%3.2f: bad interval.", interval);
  92                         goto done;
  93                 }
  94         }
  95         if (interval > 0.0) {
  96                 alarm(0);
  97                 naptime = interval;
  98                 display(0);
  99                 status();
 100                 goto done;
 101         }
 102         p = lookup(cmd);
 103         if (p == (struct cmdtab *)-1) {
 104                 error("%s: Ambiguous command.", cmd);
 105                 goto done;
 106         }
 107         if (p) {
 108                 if (curcmd == p)
 109                         goto done;
 110                 alarm(0);
 111                 (*curcmd->c_close)(wnd);
 112                 wnd = (*p->c_open)();
 113                 if (wnd == 0) {
 114                         error("Couldn't open new display");
 115                         wnd = (*curcmd->c_open)();
 116                         if (wnd == 0) {
 117                                 error("Couldn't change back to previous cmd");
 118                                 exit(1);
 119                         }
 120                         p = curcmd;
 121                 }
 122                 if ((p->c_flags & CF_INIT) == 0) {
 123                         if ((*p->c_init)())
 124                                 p->c_flags |= CF_INIT;
 125                         else
 126                                 goto done;
 127                 }
 128                 curcmd = p;
 129                 labels();
 130                 display(0);
 131                 status();
 132                 goto done;
 133         }
 134         if (curcmd->c_cmd == 0 || !(*curcmd->c_cmd)(cmd, cp))
 135                 error("%s: Unknown command.", cmd);
 136 done:
 137         sigsetmask(omask);
 138 }
 139
 140 struct cmdtab *
 141 lookup(const char *name)
 142 {
 143         const char *p, *q;
 144         struct cmdtab *ct, *found;
 145         int nmatches, longest;
 146
 147         longest = 0;
 148         nmatches = 0;
 149         found = NULL;
 150         for (ct = cmdtab; (p = ct->c_name); ct++) {
 151                 for (q = name; *q == *p++; q++)
 152                         if (*q == 0)            /* exact match? */
 153                                 return (ct);
 154                 if (!*q) {                      /* the name was a prefix */
 155                         if (q - name > longest) {
 156                                 longest = q - name;
 157                                 nmatches = 1;
 158                                 found = ct;
 159                         } else if (q - name == longest)
 160                                 nmatches++;
 161                 }
 162         }
 163         if (nmatches > 1)
 164                 return ((struct cmdtab *)-1);
 165         return (found);
 166 }
 167
 168 void
 169 status(void)
 170 {
 171
 172         error("Showing %s, refresh every %3.2f seconds.",
 173           curcmd->c_name, naptime);
 174 }
 175
 176 int
 177 prefix(const char *s1, const char *s2)
 178 {
 179
 180         while (*s1 == *s2) {
 181                 if (*s1 == '\0')
 182                         return (1);
 183                 s1++, s2++;
 184         }
 185         return (*s1 == '\0');
 186 }