stdlib/l64a.c

   1 /*
   2  * Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * Written by J.T. Conklin <jtc@netbsd.org>.
  27  * Public domain.
  28  */
  29
  30 #if defined(LIBC_SCCS) && !defined(lint)
  31 static char *rcsid = "$OpenBSD: l64a.c,v 1.3 1997/08/17 22:58:34 millert Exp $";
  32 #endif /* LIBC_SCCS and not lint */
  33
  34 #include <errno.h>
  35 #include <stdlib.h>
  36
  37 char *
  38 l64a(value)
  39         long value;
  40 {
  41         static char buf[8];
  42         char *s = buf;
  43         int digit;
  44         int i;
  45
  46         if (value < 0) {
  47                 errno = EINVAL;
  48                 return(NULL);
  49         }
  50
  51         for (i = 0; value != 0 && i < 6; i++) {
  52                 digit = value & 0x3f;
  53
  54                 if (digit < 2)
  55                         *s = digit + '.';
  56                 else if (digit < 12)
  57                         *s = digit + '0' - 2;
  58                 else if (digit < 38)
  59                         *s = digit + 'A' - 12;
  60                 else
  61                         *s = digit + 'a' - 38;
  62
  63                 value >>= 6;
  64                 s++;
  65         }
  66
  67         *s = '\0';
  68
  69         return(buf);
  70 }
  71