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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 dif-
       fer (consult the corresponding 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 inte-
       gers 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  termina-
       tor, a64l() shall use only characters preceding the null terminator. The a64l() function shall scan the charac-
       ter 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 behav-
       ior of a64l() is unspecified if s is a null pointer or the string pointed to by s was not generated by a previ-
       ous call to l64a().

       The  l64a()  function shall take a long argument and return a pointer to the corresponding radix-64 representa-
       tion.  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, uuencode

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Stan-
       dard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base  Specifica-
       tions  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 Stan-
       dard,  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)