apps/sh/main.c

   1 /*
   2  *  ZeX/OS
   3  *  Copyright (C) 2007  Tomas 'ZeXx86' Jedrzejek (zexx86@zexos.org)
   4  *  Copyright (C) 2008  Tomas 'ZeXx86' Jedrzejek (zexx86@zexos.org)
   5  *  Copyright (C) 2009  Tomas 'ZeXx86' Jedrzejek (zexx86@zexos.org)
   6  *
   7  *  This program is free software: you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation, either version 3 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21
  22 #include <stdio.h>
  23 #include <string.h>
  24 #include <stdlib.h>
  25 #include <unistd.h>
  26
  27 #define SHELL_VERSION           "0.0.3"
  28
  29 char *cmdline;
  30 int cmdline_len;
  31
  32 unsigned key_pressed (int keycode)
  33 {
  34         int scancode = getkey ();
  35
  36         if (scancode == keycode)
  37                 return 1;
  38
  39         if (scancode == keycode+128)
  40                 return 2;
  41         else
  42                 return 0;
  43 }
  44
  45 int init ()
  46 {
  47         cmdline = (char *) malloc (sizeof (char) * 64);
  48
  49         if (!cmdline) {
  50                 printf ("ERROR -> not enough memory !\n");
  51                 return 0;
  52         }
  53
  54         cmdline_len = 0;
  55
  56         return 1;
  57 }
  58
  59 int refresh_cmd ()
  60 {
  61         setcolor (7, 0);
  62         printf (" $ ");
  63         setcolor (15, 0);
  64
  65         return 1;
  66 }
  67
  68 int check_cmd ()
  69 {
  70         if (!cmdline_len)
  71                 return 1;
  72
  73         printf ("\n");
  74
  75         /* exit app */
  76         if (!strcmp (cmdline, "exit"))
  77                 return 0;
  78
  79         system (cmdline);
  80
  81         refresh_cmd ();
  82
  83         return 1;
  84 }
  85
  86 int loop ()
  87 {
  88         int ret = 1;
  89         unsigned char c;
  90
  91         c = getch ();
  92
  93         if (c && cmdline_len < 64) {
  94                 cmdline[cmdline_len] = (char) c;
  95
  96                 if (c == '\n') {
  97                         cmdline[cmdline_len] = '\0';
  98                         ret = check_cmd ();
  99                         cmdline_len = 0;
 100                 } else {
 101                         if (c == '\b') {
 102                                 if (cmdline_len > 0)
 103                                         cmdline_len --;
 104                         } else
 105                                 cmdline_len ++;
 106
 107                         if (cmdline_len >= 0)
 108                                 putch (c);
 109                 }
 110         }
 111
 112         schedule ();
 113
 114         return ret;
 115 }
 116
 117 int main (int argc, char **argv)
 118 {
 119         printf ("Shell v%s\n", SHELL_VERSION);
 120
 121         int ret = init ();
 122
 123         refresh_cmd ();
 124
 125         while (ret)
 126                 ret = loop ();
 127
 128         printf ("Bye !\n");
 129
 130         free (cmdline);
 131
 132         return 0;
 133 }
 134