stdlib/a64l.c

   1 /*
   2  * Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 /*
  24  * Written by J.T. Conklin <jtc@netbsd.org>.
  25  * Public domain.
  26  */
  27
  28 #if defined(LIBC_SCCS) && !defined(lint)
  29 static char *rcsid = "$OpenBSD: a64l.c,v 1.3 1997/08/17 22:58:34 millert Exp $";
  30 #endif /* LIBC_SCCS and not lint */
  31
  32 #include <errno.h>
  33 #include <stdlib.h>
  34
  35 long
  36 a64l(s)
  37         const char *s;
  38 {
  39         long value, digit, shift;
  40         int i;
  41
  42         if (s == NULL) {
  43                 errno = EINVAL;
  44                 return(-1L);
  45         }
  46
  47         value = 0;
  48         shift = 0;
  49         for (i = 0; *s && i < 6; i++, s++) {
  50                 if (*s >= '.' && *s <= '/')
  51                         digit = *s - '.';
  52                 else if (*s >= '0' && *s <= '9')
  53                         digit = *s - '0' + 2;
  54                 else if (*s >= 'A' && *s <= 'Z')
  55                         digit = *s - 'A' + 12;
  56                 else if (*s >= 'a' && *s <= 'z')
  57                         digit = *s - 'a' + 38;
  58                 else {
  59                         errno = EINVAL;
  60                         return(-1L);
  61                 }
  62
  63                 value |= digit << shift;
  64                 shift += 6;
  65         }
  66
  67         return(value);
  68 }
  69