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      1 /*	$NetBSD: keyboard.c,v 1.26 2015/08/23 18:33:15 mrg Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1980, 1992, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #ifndef lint
     34 #if 0
     35 static char sccsid[] = "@(#)keyboard.c	8.1 (Berkeley) 6/6/93";
     36 #endif
     37 __RCSID("$NetBSD: keyboard.c,v 1.26 2015/08/23 18:33:15 mrg Exp $");
     38 #endif /* not lint */
     39 
     40 #include <sys/types.h>
     41 
     42 #include <ctype.h>
     43 #include <signal.h>
     44 #include <termios.h>
     45 #include <stdlib.h>
     46 #include <string.h>
     47 #include <signal.h>
     48 
     49 #include "systat.h"
     50 #include "extern.h"
     51 
     52 extern sig_atomic_t needsredraw;
     53 
     54 void
     55 keyboard(void)
     56 {
     57 	int ch, rch, col;
     58 	char *line;
     59 	int i, linesz;
     60 	static char help[] = "help";
     61 	static char quit[] = "quit";
     62 
     63 	ch = 0;	/* XXX gcc */
     64 	linesz = COLS - 2;		/* XXX does not get updated on SIGWINCH */
     65 	if ((line = malloc(linesz)) == NULL) {
     66 		error("malloc failed");
     67 		die(0);
     68 	}
     69 
     70 	for (;;) {
     71 		col = 0;
     72 		move(CMDLINE, 0);
     73 
     74 		while (col == 0 || (ch != '\r' && ch != '\n')) {
     75 			refresh();
     76 			for (;;) {
     77 				ch = getch();
     78 				if (!needsredraw)
     79 					break;
     80 				redraw();
     81 			}
     82 			if (ch == ERR) {
     83 				display(SIGALRM);
     84 				continue;
     85 			}
     86 			if (ch == KEY_RESIZE) {
     87 				redraw();
     88 				continue;
     89 			}
     90 			ch &= 0177;
     91 			rch = ch;
     92 			if (col == 0) {
     93 				switch(ch) {
     94 				    case '\n':
     95 				    case '\r':
     96 				    case ' ':
     97 					clearerror();
     98 					display(0);
     99 					break;
    100 				    case CTRL('l'):
    101 					clearerror();
    102 					wrefresh(curscr);
    103 					break;
    104 				    case CTRL('g'):
    105 					status();
    106 					break;
    107 				    case '?':
    108 				    case 'H':
    109 				    case 'h':
    110 					command(help);
    111 					move(CMDLINE, 0);
    112 					break;
    113 				    case 'Q':
    114 				    case 'q':
    115 					command(quit);
    116 					break;
    117 				    case ':':
    118 					move(CMDLINE, 0);
    119 					clrtoeol();
    120 					addch(':');
    121 					col++;
    122 					break;
    123 				}
    124 				continue;
    125 			}
    126 			if (ch == '\b' || ch == '\177' || ch == erasechar()) {
    127 				if (col > 0)
    128 					col--;
    129 				goto doerase;
    130 			}
    131 			if (ch == CTRL('w') && col > 0) {
    132 				while (--col >= 0 &&
    133 				    isspace((unsigned char)line[col]))
    134 					continue;
    135 				col++;
    136 				while (--col >= 0 &&
    137 				    !isspace((unsigned char)line[col]))
    138 					if (col == 0)
    139 						break;
    140 				col++;
    141 				goto doerase;
    142 			}
    143 			if (ch == killchar() && col > 0) {
    144 				col = 1;
    145 		doerase:
    146 				move(CMDLINE, col);
    147 				clrtoeol();
    148 				continue;
    149 			}
    150 			if (isprint(rch) || rch == ' ') {
    151 				if (col < linesz) {
    152 					line[col] = rch;
    153 					mvaddch(CMDLINE, col, rch);
    154 					col++;
    155 				}
    156 			}
    157 		}
    158 		line[col] = '\0';
    159 		/* pass commands as lowercase */
    160 		for (i = 1; i < col ; i++)
    161 			line[i] = tolower((unsigned char)line[i]);
    162 		command(line + 1);
    163 	}
    164 	/* NOTREACHED */
    165 }
    166