usr.bin/systat/cmds.c

   1 /*      $NetBSD: cmds.c,v 1.27 2004/07/03 18:54:47 mycroft Exp $        */
   2
   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 #include <sys/cdefs.h>
  33 #ifndef lint
  34 #if 0
  35 static char sccsid[] = "@(#)cmds.c      8.2 (Berkeley) 4/29/95";
  36 #endif
  37 __RCSID("$NetBSD: cmds.c,v 1.27 2004/07/03 18:54:47 mycroft Exp $");
  38 #endif /* not lint */
  39
  40 #include <ctype.h>
  41 #include <signal.h>
  42 #include <string.h>
  43 #include <unistd.h>
  44
  45 #include "systat.h"
  46 #include "extern.h"
  47
  48 void    switch_mode(struct mode *p);
  49
  50 void
  51 command(char *cmd)
  52 {
  53         struct command *c;
  54         struct mode *p;
  55         char *args;
  56
  57         if (cmd[0] == '\0')
  58                 return;
  59
  60         args = cmd;
  61         cmd = strsep(&args, " \t");
  62
  63         if (curmode->c_commands) {
  64                 for (c = curmode->c_commands; c->c_name; c++) {
  65                         if (strstr(c->c_name, cmd) == c->c_name) {
  66                                 (c->c_cmd)(args);
  67                                 goto done;
  68                         }
  69                 }
  70         }
  71
  72         for (c = global_commands; c->c_name; c++) {
  73                 if (strstr(c->c_name, cmd) == c->c_name) {
  74                         (c->c_cmd)(args);
  75                         goto done;
  76                 }
  77         }
  78
  79         for (p = modes; p->c_name; p++) {
  80                 if (strstr(p->c_name, cmd) == p->c_name) {
  81                         switch_mode(p);
  82                         goto done;
  83                 }
  84         }
  85
  86         if (isdigit((unsigned char)cmd[0])) {
  87                 global_interval(cmd);
  88                 goto done;
  89         }
  90
  91         error("%s: Unknown command.", cmd);
  92 done:
  93         ;
  94 }
  95
  96 void
  97 switch_mode(struct mode *p)
  98 {
  99         int switchfail;
 100         struct mode *r;
 101
 102         switchfail = 0;
 103         r = p;
 104
 105         if (curmode == p) {
 106                 status();
 107                 return;
 108         }
 109
 110         alarm(0);
 111         (*curmode->c_close)(wnd);
 112         wnd = (*p->c_open)();
 113         if (wnd == 0) {
 114                 wnd = (*curmode->c_open)();
 115                 if (wnd == 0) {
 116                         error("Couldn't change back to previous mode");
 117                         die(0);
 118                 }
 119
 120                 p = curmode;
 121                 switchfail++;
 122         }
 123
 124         if ((p->c_flags & CF_INIT) == 0) {
 125                 if ((*p->c_init)())
 126                         p->c_flags |= CF_INIT;
 127                 else {
 128                         (*p->c_close)(wnd);
 129                         wnd = (*curmode->c_open)();
 130                         p = curmode;
 131                         switchfail++;
 132                 }
 133         }
 134
 135         curmode = p;
 136         labels();
 137         display(0);
 138         if (switchfail && !allflag)
 139                 error("Couldn't switch mode, back to %s", curmode->c_name);
 140         else {
 141                 if (switchfail && allflag) {
 142                         r++;
 143                         switch_mode(r);
 144                 } else {
 145                         status();
 146                 }
 147         }
 148 }
 149
 150 void
 151 status(void)
 152 {
 153         error("Showing %s, refresh every %d seconds.", curmode->c_name, naptime);
 154 }