A64L(3P)						     POSIX Programmer's Manual							  A64L(3P)

PROLOG

       This  manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (consult the correspond-
       ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

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
       corresponding long value. If the string pointed to by s contains more than six characters, a64l() shall use the first six. If the first six
       characters  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 resulting 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 representation.  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, uuen-
       code

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
       ogy -- 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(3P)