lib/readkey.c

   1 /*
   2  * readkey.c - read keystrokes and decode standard escape sequences
   3  *
   4  * Partly based on busybox vi
   5  *
   6  * Copyright (c) 2007 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
   7  *
   8  * See file CREDITS for list of people who contributed to this
   9  * project.
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2
  13  * as published by the Free Software Foundation.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23  */
  24
  25 #include <common.h>
  26 #include <linux/ctype.h>
  27 #include <readkey.h>
  28
  29 struct esc_cmds {
  30         const char *seq;
  31         char val;
  32 };
  33
  34 static const struct esc_cmds esccmds[] = {
  35         {"OA", KEY_UP},       // cursor key Up
  36         {"OB", KEY_DOWN},     // cursor key Down
  37         {"OC", KEY_RIGHT},    // Cursor Key Right
  38         {"OD", KEY_LEFT},     // cursor key Left
  39         {"OH", KEY_HOME},     // Cursor Key Home
  40         {"OF", KEY_END},      // Cursor Key End
  41         {"[A", KEY_UP},       // cursor key Up
  42         {"[B", KEY_DOWN},     // cursor key Down
  43         {"[C", KEY_RIGHT},    // Cursor Key Right
  44         {"[D", KEY_LEFT},     // cursor key Left
  45         {"[H", KEY_HOME},     // Cursor Key Home
  46         {"[F", KEY_END},      // Cursor Key End
  47         {"[1~", KEY_HOME},    // Cursor Key Home
  48         {"[2~", KEY_INSERT},  // Cursor Key Insert
  49         {"[3~", KEY_DEL},     // Cursor Key Delete
  50         {"[4~", KEY_END},     // Cursor Key End
  51         {"[5~", KEY_PAGEUP},  // Cursor Key Page Up
  52         {"[6~", KEY_PAGEDOWN},// Cursor Key Page Down
  53 };
  54
  55 int read_key(void)
  56 {
  57         char c;
  58         char esc[5];
  59         c = getc();
  60
  61         if (c == 27) {
  62                 int i = 0;
  63                 esc[i++] = getc();
  64                 esc[i++] = getc();
  65                 if (isdigit(esc[1])) {
  66                         while(1) {
  67                                 esc[i] = getc();
  68                                 if (esc[i++] == '~')
  69                                         break;
  70                         }
  71                 }
  72                 esc[i] = 0;
  73                 for (i = 0; i < ARRAY_SIZE(esccmds); i++){
  74                         if (!strcmp(esc, esccmds[i].seq))
  75                                 return esccmds[i].val;
  76                 }
  77                 return -1;
  78         }
  79         return c;
  80 }
  81 EXPORT_SYMBOL(read_key);