position.c

   1 /*
   2 ** $Id$
   3 */
   4 /*
   5 **    Copyright (C) 1998 Kurt Van den Branden
   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 2 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, write to the Free Software
  19 ** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 #include "position.h"
  23
  24 listheader * copy_position_row (listheader * orig)
  25 {
  26     listheader * new;
  27
  28     new = copyll (orig, copy_position);
  29
  30     return (new);
  31 }
  32
  33
  34 void * copy_position (void * orig)
  35 {
  36     position * o_item = orig,
  37         * n_item;
  38
  39     if (o_item == NULL)
  40         return (NULL);
  41
  42     n_item = new_position ();
  43
  44     n_item->col = o_item->col;
  45     n_item->row = o_item->row;
  46
  47     return ((void *) n_item);
  48 }
  49
  50
  51 void del_position_f (void * item)
  52 {
  53     position * pos = item;
  54
  55     if (pos != NULL)
  56     {
  57         free (pos);
  58     }
  59     return;
  60 }
  61
  62
  63 position * strtopos (const char * str)
  64 {
  65     position * ptr;
  66     int col, row;
  67
  68     if (str == NULL)
  69     {
  70         return (NULL);
  71     }
  72
  73     col = str[0] - 'a'; /* should be the colnr macro */
  74     if ((col < 0) || (col > 8))
  75     {
  76         return (NULL);
  77     }
  78     row = str[1] - '0';
  79     if ((row < 1) || (row > 9))
  80     {
  81         return (NULL);
  82     }
  83
  84     ptr = new_position();
  85     ptr->col = col;
  86     ptr->row = row;
  87     return (ptr);
  88 }
  89
  90 char * postostr (position * pos)
  91 {
  92     char * str;
  93
  94     if (pos == NULL)
  95     {
  96         return (NULL);
  97     }
  98
  99     str = (char *) malloc (3);
 100     str[0] = pos->col + 'a';
 101     str[1] = pos->row + '0';
 102     str[2] = '\0';
 103
 104     return (str);
 105 }