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  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include <sys/cdefs.h>
  35
  36 __FBSDID("$FreeBSD$");
  37
  38 #ifdef lint
  39 static const char sccsid[] = "@(#)keyboard.c    8.1 (Berkeley) 6/6/93";
  40 #endif
  41
  42 #include <ctype.h>
  43 #include <signal.h>
  44 #include <termios.h>
  45
  46 #include "systat.h"
  47 #include "extern.h"
  48
  49 int
  50 keyboard(void)
  51 {
  52         char ch, line[80];
  53         int oldmask;
  54
  55         for (;;) {
  56                 col = 0;
  57                 move(CMDLINE, 0);
  58                 do {
  59                         refresh();
  60                         ch = getch() & 0177;
  61                         if (ch == 0177 && ferror(stdin)) {
  62                                 clearerr(stdin);
  63                                 continue;
  64                         }
  65                         if (ch >= 'A' && ch <= 'Z')
  66                                 ch += 'a' - 'A';
  67                         if (col == 0) {
  68 #define mask(s) (1 << ((s) - 1))
  69                                 if (ch == CTRL('l')) {
  70                                         oldmask = sigblock(mask(SIGALRM));
  71                                         wrefresh(curscr);
  72                                         sigsetmask(oldmask);
  73                                         continue;
  74                                 }
  75                                 if (ch == CTRL('g')) {
  76                                         oldmask = sigblock(mask(SIGALRM));
  77                                         status();
  78                                         sigsetmask(oldmask);
  79                                         continue;
  80                                 }
  81                                 if (ch != ':')
  82                                         continue;
  83                                 move(CMDLINE, 0);
  84                                 clrtoeol();
  85                         }
  86                         if (ch == erasechar() && col > 0) {
  87                                 if (col == 1 && line[0] == ':')
  88                                         continue;
  89                                 col--;
  90                                 goto doerase;
  91                         }
  92                         if (ch == CTRL('w') && col > 0) {
  93                                 while (--col >= 0 && isspace(line[col]))
  94                                         ;
  95                                 col++;
  96                                 while (--col >= 0 && !isspace(line[col]))
  97                                         if (col == 0 && line[0] == ':')
  98                                                 break;
  99                                 col++;
 100                                 goto doerase;
 101                         }
 102                         if (ch == killchar() && col > 0) {
 103                                 col = 0;
 104                                 if (line[0] == ':')
 105                                         col++;
 106                 doerase:
 107                                 move(CMDLINE, col);
 108                                 clrtoeol();
 109                                 continue;
 110                         }
 111                         if (isprint(ch) || ch == ' ') {
 112                                 line[col] = ch;
 113                                 mvaddch(CMDLINE, col, ch);
 114                                 col++;
 115                         }
 116                 } while (col == 0 || (ch != '\r' && ch != '\n'));
 117                 line[col] = '\0';
 118                 oldmask = sigblock(mask(SIGALRM));
 119                 command(line + 1);
 120                 sigsetmask(oldmask);
 121         }
 122         /*NOTREACHED*/
 123 }