usr/src/lib/libc/port/gen/a64l.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*      Copyright (c) 1988 AT&T */
  28 /*        All Rights Reserved   */
  29
  30 #pragma ident   "%Z%%M% %I%     %E% SMI"
  31
  32 /*
  33  * convert base 64 ascii to long int
  34  * char set is [./0-9A-Za-z]
  35  *
  36  */
  37 #include "lint.h"
  38 #include <sys/types.h>
  39 #include <stdlib.h>
  40
  41 #define BITSPERCHAR     6 /* to hold entire character set */
  42 #define MAXBITS         (6 * BITSPERCHAR) /* maximum number */
  43                         /* of 6 chars converted */
  44
  45 long
  46 a64l(const char *s)
  47 {
  48         int i, c;
  49         int lg = 0;
  50
  51         for (i = 0; ((c = *s++) != '\0') && (i < MAXBITS); i += BITSPERCHAR) {
  52                 if (c > 'Z')
  53                         c -= 'a' - 'Z' - 1;
  54                 if (c > '9')
  55                         c -= 'A' - '9' - 1;
  56                 lg |= (c - ('0' - 2)) << i;
  57         }
  58         return ((long)lg);
  59 }