stdlib/a64l.c

   1 /* Copyright (C) 1995, 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, August 1995.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #include <stdlib.h>
  21
  22 long int
  23 a64l (string)
  24      const char *string;
  25 {
  26   size_t cnt;
  27   unsigned long int result = 0l;
  28
  29   for (cnt = 0; cnt < 6; ++cnt)
  30     {
  31       result <<= 6;
  32       switch (string[cnt])
  33         {
  34         case '.':
  35           break;
  36         case '/':
  37           result |= 1;
  38           break;
  39         case '0' ... '9':
  40           result |= 2 + string[cnt] - '0';
  41           break;
  42         case 'A' ... 'Z':
  43           result |= 12 + string[cnt] - 'A';
  44           break;
  45         case 'a' ... 'z':
  46           result |= 38 + string[cnt] - 'a';
  47           break;
  48         default:
  49           return result >> 6;
  50         }
  51     }
  52
  53   return (long int) result;
  54 }