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 <errno.h>
  43 #include <ctype.h>
  44 #include <signal.h>
  45 #include <stdlib.h>
  46 #include <termios.h>
  47
  48 #include "systat.h"
  49 #include "extern.h"
  50
  51 int
  52 keyboard(void)
  53 {
  54         char ch, line[80];
  55         int oldmask;
  56
  57         for (;;) {
  58                 col = 0;
  59                 move(CMDLINE, 0);
  60                 do {
  61                         refresh();
  62                         ch = getch();
  63                         if (ch == ERR) {
  64                                 if (errno == EINTR)
  65                                         continue;
  66                                 exit(1);
  67                         }
  68                         if (ch >= 'A' && ch <= 'Z')
  69                                 ch += 'a' - 'A';
  70                         if (col == 0) {
  71 #define mask(s) (1 << ((s) - 1))
  72                                 if (ch == CTRL('l')) {
  73                                         oldmask = sigblock(mask(SIGALRM));
  74                                         wrefresh(curscr);
  75                                         sigsetmask(oldmask);
  76                                         continue;
  77                                 }
  78                                 if (ch == CTRL('g')) {
  79                                         oldmask = sigblock(mask(SIGALRM));
  80                                         status();
  81                                         sigsetmask(oldmask);
  82                                         continue;
  83                                 }
  84                                 if (ch != ':')
  85                                         continue;
  86                                 move(CMDLINE, 0);
  87                                 clrtoeol();
  88                         }
  89                         if (ch == erasechar() && col > 0) {
  90                                 if (col == 1 && line[0] == ':')
  91                                         continue;
  92                                 col--;
  93                                 goto doerase;
  94                         }
  95                         if (ch == CTRL('w') && col > 0) {
  96                                 while (--col >= 0 && isspace(line[col]))
  97                                         ;
  98                                 col++;
  99                                 while (--col >= 0 && !isspace(line[col]))
 100                                         if (col == 0 && line[0] == ':')
 101                                                 break;
 102                                 col++;
 103                                 goto doerase;
 104                         }
 105                         if (ch == killchar() && col > 0) {
 106                                 col = 0;
 107                                 if (line[0] == ':')
 108                                         col++;
 109                 doerase:
 110                                 move(CMDLINE, col);
 111                                 clrtoeol();
 112                                 continue;
 113                         }
 114                         if (isprint(ch) || ch == ' ') {
 115                                 line[col] = ch;
 116                                 mvaddch(CMDLINE, col, ch);
 117                                 col++;
 118                         }
 119                 } while (col == 0 || (ch != '\r' && ch != '\n'));
 120                 line[col] = '\0';
 121                 oldmask = sigblock(mask(SIGALRM));
 122                 command(line + 1);
 123                 sigsetmask(oldmask);
 124         }
 125         /*NOTREACHED*/
 126 }