usr/src/lib/libbc/libc/gen/common/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, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*      Copyright (c) 1984 AT&T */
  23 /*        All Rights Reserved   */
  24
  25 #pragma ident   "%Z%%M% %I%     %E% SMI"  /* from S5R2 1.5 */
  26
  27 /*LINTLIBRARY*/
  28 /*
  29  * convert base 64 ascii to long int
  30  * char set is [./0-9A-Za-z]
  31  *
  32  */
  33
  34 #define BITSPERCHAR     6 /* to hold entire character set */
  35
  36 long
  37 a64l(s)
  38 register char *s;
  39 {
  40         register int i, c;
  41         long lg = 0;
  42
  43         for (i = 0; (c = *s++) != '\0'; i += BITSPERCHAR) {
  44                 if (c > 'Z')
  45                         c -= 'a' - 'Z' - 1;
  46                 if (c > '9')
  47                         c -= 'A' - '9' - 1;
  48                 lg |= (long)(c - ('0' - 2)) << i;
  49         }
  50         return (lg);
  51 }