changes from donn@utah-cs for common header file for pcc

[unix-history] / usr / src / usr.bin / systat / cmds.c

#ifndef lint
static char sccsid[] = "@(#)cmds.c      1.4 (Lucasfilm) %G%";
#endif

/*
* Command support.
*/

#include "systat.h"
#include <signal.h>
#include <ctype.h>

command(cmd)
       char *cmd;
{
       register char *cp;
       register struct cmdtab *p;
       char *arg;

       for (cp = cmd; *cp && !isspace(*cp); cp++)
               ;
       if (*cp)
               *cp++ = '\0';
       if (*cmd == '\0')
               return;
       for (; *cp && isspace(*cp); cp++)
               ;
       if (strcmp(cmd, "quit") == 0 || strcmp(cmd, "q") == 0)
               die();
       if (strcmp(cmd, "load") == 0) {
               load();
               return;
       }
       if (strcmp(cmd, "stop") == 0) {
               alarm(0);
               mvaddstr(CMDLINE, 0, "Refresh disabled.");
               clrtoeol();
               return;
       }
       if (strcmp(cmd, "start") == 0 || strcmp(cmd, "interval") == 0) {
               int x;

               x = *cp ? atoi(cp) : naptime;
               if (x <= 0) {
                       error("%d: bad interval.", x);
                       return;
               }
               alarm(0);
               naptime = x;
               display();
               status();
               return;
       }
       p = lookup(cmd);
       if (p == (struct cmdtab *)-1) {
               error("%s: Ambiguous command.", cmd);
               return;
       }
       if (p) {
               if (curcmd == p)
                       return;
               alarm(0);
               (*curcmd->c_close)(wnd);
               wnd = (*p->c_open)();
               curcmd = p;
               if (p->c_flags == 0) {
                       (*p->c_init)();
                       p->c_flags = 1;
               }
               labels();
               display();
               status();
               return;
       }
       if (curcmd->c_cmd && (*curcmd->c_cmd)(cmd, cp))
               return;
       error("%s: Unknown command.", cmd);
}

struct cmdtab *
lookup(name)
       register char *name;
{
       register char *p, *q;
       register struct cmdtab *c, *found;
       register int nmatches, longest;

       longest = 0;
       nmatches = 0;
       found = 0;
       for (c = cmdtab; p = c->c_name; c++) {
               for (q = name; *q == *p++; q++)
                       if (*q == 0)            /* exact match? */
                               return (c);
               if (!*q) {                      /* the name was a prefix */
                       if (q - name > longest) {
                               longest = q - name;
                               nmatches = 1;
                               found = c;
                       } else if (q - name == longest)
                               nmatches++;
               }
       }
       if (nmatches > 1)
               return ((struct cmdtab *)-1);
       return (found);
}

status()
{

       error("Showing %s, refresh every %d seconds.",
         curcmd->c_name, naptime);
}

suspend()
{
       int oldmask;

       alarm(0);
       move(CMDLINE, 0);
       refresh();
       echo();
       nocrmode();
       signal(SIGTSTP, SIG_DFL);
       oldmask = sigsetmask(0);
       kill(getpid(), SIGTSTP);
       sigsetmask(oldmask);
       signal(SIGTSTP, suspend);
       crmode();
       noecho();
       move(CMDLINE, col);
       wrefresh(curscr);
       alarm(naptime);
}