usr.bin/systat/keyboard.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  * 4. 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
  30 #include <sys/cdefs.h>
  31
  32 __FBSDID("$FreeBSD$");
  33
  34 #ifdef lint
  35 static const char sccsid[] = "@(#)keyboard.c    8.1 (Berkeley) 6/6/93";
  36 #endif
  37
  38 #include <errno.h>
  39 #include <ctype.h>
  40 #include <signal.h>
  41 #include <stdlib.h>
  42 #include <termios.h>
  43
  44 #include "systat.h"
  45 #include "extern.h"
  46
  47 int
  48 keyboard(void)
  49 {
  50         char ch, line[80];
  51         int oldmask;
  52
  53         for (;;) {
  54                 col = 0;
  55                 move(CMDLINE, 0);
  56                 do {
  57                         refresh();
  58                         ch = getch();
  59                         if (ch == ERR) {
  60                                 if (errno == EINTR)
  61                                         continue;
  62                                 exit(1);
  63                         }
  64                         if (ch >= 'A' && ch <= 'Z')
  65                                 ch += 'a' - 'A';
  66                         if (col == 0) {
  67 #define mask(s) (1 << ((s) - 1))
  68                                 if (ch == CTRL('l')) {
  69                                         oldmask = sigblock(mask(SIGALRM));
  70                                         wrefresh(curscr);
  71                                         sigsetmask(oldmask);
  72                                         continue;
  73                                 }
  74                                 if (ch == CTRL('g')) {
  75                                         oldmask = sigblock(mask(SIGALRM));
  76                                         status();
  77                                         sigsetmask(oldmask);
  78                                         continue;
  79                                 }
  80                                 if (ch != ':')
  81                                         continue;
  82                                 move(CMDLINE, 0);
  83                                 clrtoeol();
  84                         }
  85                         if (ch == erasechar() && col > 0) {
  86                                 if (col == 1 && line[0] == ':')
  87                                         continue;
  88                                 col--;
  89                                 goto doerase;
  90                         }
  91                         if (ch == CTRL('w') && col > 0) {
  92                                 while (--col >= 0 && isspace(line[col]))
  93                                         ;
  94                                 col++;
  95                                 while (--col >= 0 && !isspace(line[col]))
  96                                         if (col == 0 && line[0] == ':')
  97                                                 break;
  98                                 col++;
  99                                 goto doerase;
 100                         }
 101                         if (ch == killchar() && col > 0) {
 102                                 col = 0;
 103                                 if (line[0] == ':')
 104                                         col++;
 105                 doerase:
 106                                 move(CMDLINE, col);
 107                                 clrtoeol();
 108                                 continue;
 109                         }
 110                         if (isprint(ch) || ch == ' ') {
 111                                 line[col] = ch;
 112                                 mvaddch(CMDLINE, col, ch);
 113                                 col++;
 114                         }
 115                 } while (col == 0 || (ch != '\r' && ch != '\n'));
 116                 line[col] = '\0';
 117                 oldmask = sigblock(mask(SIGALRM));
 118                 command(line + 1);
 119                 sigsetmask(oldmask);
 120         }
 121         /*NOTREACHED*/
 122 }