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A64L(P)			   POSIX Programmer's Manual		       A64L(P)

NAME
       a64l,  l64a  -  convert	between	 a 32-bit integer and a radix-64 ASCII
       string

SYNOPSIS
       #include <stdlib.h>

       long a64l(const char *s);
       char *l64a(long value);

DESCRIPTION
       These functions maintain numbers stored in radix-64  ASCII  characters.
       This is a notation by which 32-bit integers can be represented by up to
       six characters; each character represents a digit in radix-64 notation.
       If the type long contains more than 32 bits, only the low-order 32 bits
       shall be used for these operations.

       The characters used to represent digits are '.' (dot) for 0, '/' for 1,
       '0'  through  '9'  for  [2,11],	'A'  through  'Z' for [12,37], and 'a'
       through 'z' for [38,63].

       The a64l() function shall take a pointer to a radix-64  representation,
       in  which the first digit is the least significant, and return the cor‐
       responding long value. If the string pointed to by s contains more than
       six  characters, a64l() shall use the first six. If the first six char‐
       acters of the string contain a null terminator, a64l() shall  use  only
       characters  preceding  the  null	 terminator. The a64l() function shall
       scan the character string from left to right with the least significant
       digit  on the left, decoding each character as a 6-bit radix-64 number.
       If the type long contains more than 32 bits,  the  resulting  value  is
       sign-extended.  The  behavior  of  a64l() is unspecified if s is a null
       pointer or the string pointed to by s was not generated by  a  previous
       call to l64a().

       The  l64a() function shall take a long argument and return a pointer to
       the corresponding radix-64 representation.  The behavior of  l64a()  is
       unspecified if value is negative.

       The  value  returned  by	 l64a() may be a pointer into a static buffer.
       Subsequent calls to l64a() may overwrite the buffer.

       The l64a() function need not be	reentrant.  A  function	 that  is  not
       required to be reentrant is not required to be thread-safe.

RETURN VALUE
       Upon  successful completion, a64l() shall return the long value result‐
       ing from conversion of the input string. If a string pointed to by s is
       an empty string, a64l() shall return 0L.

       The  l64a() function shall return a pointer to the radix-64 representa‐
       tion.  If value is 0L, l64a()  shall  return  a	pointer	 to  an	 empty
       string.

ERRORS
       No errors are defined.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       If   the	  type	long  contains	more  than  32	bits,  the  result  of
       a64l(l64a(x)) is x in the low-order 32 bits.

RATIONALE
       This is not the same encoding as used by either encoding variant of the
       uuencode utility.

FUTURE DIRECTIONS
       None.

SEE ALSO
       strtoul()  ,  the  Base	Definitions  volume  of	 IEEE Std 1003.1-2001,
       <stdlib.h>, the Shell and  Utilities  volume  of	 IEEE Std 1003.1-2001,
       uuencode

COPYRIGHT
       Portions	 of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
       --  Portable  Operating	System	Interface (POSIX), The Open Group Base
       Specifications Issue 6, Copyright (C) 2001-2003	by  the	 Institute  of
       Electrical  and	Electronics  Engineers, Inc and The Open Group. In the
       event of any discrepancy between this version and the original IEEE and
       The  Open Group Standard, the original IEEE and The Open Group Standard
       is the referee document. The original Standard can be  obtained	online
       at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group		     2003			       A64L(P)
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