apps/sh/main.c

   1 /*
   2  *  ZeX/OS
   3  *  Copyright (C) 2007  Tomas 'ZeXx86' Jedrzejek (zexx86@gmail.com)
   4  *  Copyright (C) 2008  Tomas 'ZeXx86' Jedrzejek (zexx86@gmail.com)
   5  *
   6  *  This program is free software: you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation, either version 3 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20
  21 #include <stdio.h>
  22 #include <string.h>
  23 #include <stdlib.h>
  24 #include <unistd.h>
  25
  26 #define SHELL_VERSION           "0.0.2"
  27
  28 char *cmdline;
  29 int cmdline_len;
  30
  31 unsigned key_pressed (int keycode)
  32 {
  33         int scancode = getkey ();
  34
  35         if (scancode == keycode)
  36                 return 1;
  37
  38         if (scancode == keycode+128)
  39                 return 2;
  40         else
  41                 return 0;
  42 }
  43
  44 int init ()
  45 {
  46         cmdline = (char *) malloc (sizeof (char) * 64);
  47
  48         if (!cmdline) {
  49                 printf ("ERROR -> not enough memory !\n");
  50                 return 0;
  51         }
  52
  53         cmdline_len = 0;
  54
  55         return 1;
  56 }
  57
  58 int refresh_cmd ()
  59 {
  60         setcolor (7, 0);
  61         printf (" $ ");
  62         setcolor (15, 0);
  63
  64         return 1;
  65 }
  66
  67 int check_cmd ()
  68 {
  69         if (!cmdline_len)
  70                 return 1;
  71
  72         printf ("\n");
  73
  74         /* exit app */
  75         if (!strcmp (cmdline, "exit"))
  76                 return 0;
  77
  78         system (cmdline);
  79
  80         refresh_cmd ();
  81
  82         return 1;
  83 }
  84
  85 int loop ()
  86 {
  87         int ret = 1;
  88         unsigned char c;
  89
  90         c = getch ();
  91
  92         if (c && cmdline_len < 64) {
  93                 cmdline[cmdline_len] = (char) c;
  94
  95                 if (c == '\n') {
  96                         cmdline[cmdline_len] = '\0';
  97                         ret = check_cmd ();
  98                         cmdline_len = 0;
  99                 } else {
 100                         if (c == '\b') {
 101                                 if (cmdline_len > 0)
 102                                         cmdline_len --;
 103                         } else
 104                                 cmdline_len ++;
 105
 106                         if (cmdline_len >= 0)
 107                                 putch (c);
 108                 }
 109         }
 110
 111         schedule ();
 112
 113         return ret;
 114 }
 115
 116 int main (int argc, char **argv)
 117 {
 118         printf ("Shell v%s\n", SHELL_VERSION);
 119
 120         int ret = init ();
 121
 122         refresh_cmd ();
 123
 124         while (ret)
 125                 ret = loop ();
 126
 127         printf ("Bye !\n");
 128
 129         free (cmdline);
 130
 131         return 0;
 132 }
 133