4.3BSD - /usr/src/ucb/systat/cmds.c

   1: /*
   2:  * Copyright (c) 1980 Regents of the University of California.
   3:  * All rights reserved.  The Berkeley software License Agreement
   4:  * specifies the terms and conditions for redistribution.
   5:  */
   6: 
   7: #ifndef lint
   8: static char sccsid[] = "@(#)cmds.c	5.4 (Berkeley) 12/11/85";
   9: #endif not lint
  10: 
  11: /*
  12:  * Command support.
  13:  */
  14: 
  15: #include "systat.h"
  16: #include <ctype.h>
  17: 
  18: command(cmd)
  19:         char *cmd;
  20: {
  21:         register char *cp;
  22:         register struct cmdtab *p;
  23:     int interval, omask;
  24:     extern (*sigtstpdfl)();
  25: 
  26:     omask = sigblock(sigmask(SIGALRM));
  27:         for (cp = cmd; *cp && !isspace(*cp); cp++)
  28:                 ;
  29:         if (*cp)
  30:                 *cp++ = '\0';
  31:     if (*cmd == '\0')
  32:         return;
  33:     for (; *cp && isspace(*cp); cp++)
  34:         ;
  35:         if (strcmp(cmd, "quit") == 0 || strcmp(cmd, "q") == 0)
  36:                 die();
  37:     if (strcmp(cmd, "load") == 0) {
  38:         load();
  39:         goto done;
  40:     }
  41:         if (strcmp(cmd, "stop") == 0) {
  42:                 alarm(0);
  43:                 mvaddstr(CMDLINE, 0, "Refresh disabled.");
  44:                 clrtoeol();
  45:         goto done;
  46:         }
  47:     if (strcmp(cmd, "help") == 0) {
  48:         int col, len;
  49: 
  50:         move(CMDLINE, col = 0);
  51:         for (p = cmdtab; p->c_name; p++) {
  52:             len = strlen(p->c_name);
  53:             if (col + len > COLS)
  54:                 break;
  55:             addstr(p->c_name); col += len;
  56:             if (col + 1 < COLS)
  57:                 addch(' ');
  58:         }
  59:         clrtoeol();
  60:         goto done;
  61:     }
  62:     interval = atoi(cmd);
  63:         if (interval <= 0 &&
  64:         (strcmp(cmd, "start") == 0 || strcmp(cmd, "interval") == 0)) {
  65:         interval = *cp ? atoi(cp) : naptime;
  66:                 if (interval <= 0) {
  67:             error("%d: bad interval.", interval);
  68:             goto done;
  69:                 }
  70:     }
  71:     if (interval > 0) {
  72:                 alarm(0);
  73:                 naptime = interval;
  74:                 display();
  75:                 status();
  76:         goto done;
  77:         }
  78:     p = lookup(cmd);
  79:     if (p == (struct cmdtab *)-1) {
  80:         error("%s: Ambiguous command.", cmd);
  81:         goto done;
  82:     }
  83:         if (p) {
  84:                 if (curcmd == p)
  85:             goto done;
  86:                 alarm(0);
  87:         (*curcmd->c_close)(wnd);
  88:         wnd = (*p->c_open)();
  89:         if (wnd == 0) {
  90:             error("Couldn't open new display");
  91:             wnd = (*curcmd->c_open)();
  92:             if (wnd == 0) {
  93:                 error("Couldn't change back to previous cmd");
  94:                 exit(1);
  95:             }
  96:             p = curcmd;
  97:         }
  98:         if ((p->c_flags & CF_INIT) == 0) {
  99:             if ((*p->c_init)())
 100:                 p->c_flags |= CF_INIT;
 101:             else
 102:                 goto done;
 103:         }
 104:                 curcmd = p;
 105:         labels();
 106:                 display();
 107:                 status();
 108:         goto done;
 109:         }
 110:     if (curcmd->c_cmd == 0 || !(*curcmd->c_cmd)(cmd, cp))
 111:         error("%s: Unknown command.", cmd);
 112: done:
 113:     sigsetmask(omask);
 114: }
 115: 
 116: struct cmdtab *
 117: lookup(name)
 118:     register char *name;
 119: {
 120:     register char *p, *q;
 121:     register struct cmdtab *c, *found;
 122:     register int nmatches, longest;
 123: 
 124:     longest = 0;
 125:     nmatches = 0;
 126:     found = (struct cmdtab *)-1;
 127:     for (c = cmdtab; p = c->c_name; c++) {
 128:         for (q = name; *q == *p++; q++)
 129:             if (*q == 0)        /* exact match? */
 130:                 return (c);
 131:         if (!*q) {          /* the name was a prefix */
 132:             if (q - name > longest) {
 133:                 longest = q - name;
 134:                 nmatches = 1;
 135:                 found = c;
 136:             } else if (q - name == longest)
 137:                 nmatches++;
 138:         }
 139:     }
 140:     if (nmatches > 1)
 141:         return ((struct cmdtab *)-1);
 142:     return (found);
 143: }
 144: 
 145: status()
 146: {
 147: 
 148:         error("Showing %s, refresh every %d seconds.",
 149:           curcmd->c_name, naptime);
 150: }
 151: 
 152: suspend()
 153: {
 154:         int oldmask;
 155: 
 156:     alarm(0);
 157:         move(CMDLINE, 0);
 158:         refresh();
 159:         echo();
 160:         nocrmode();
 161:         signal(SIGTSTP, sigtstpdfl);
 162:         oldmask = sigsetmask(0);
 163:         kill(getpid(), SIGTSTP);
 164:         sigsetmask(oldmask);
 165:         signal(SIGTSTP, suspend);
 166:         crmode();
 167:         noecho();
 168:         move(CMDLINE, col);
 169:     alarm(naptime);
 170: }
 171: 
 172: prefix(s1, s2)
 173:         register char *s1, *s2;
 174: {
 175: 
 176:         while (*s1 == *s2) {
 177:                 if (*s1 == '\0')
 178:                         return (1);
 179:                 s1++, s2++;
 180:         }
 181:         return (*s1 == '\0');
 182: }

Defined functions

Defined variables