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Linux 2.6 - man page for a64l (linux section 3posix)

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 repre-
       sents  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  char-
       acters  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, 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 orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003					  A64L(P)


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