a64l(3p) — Linux manual page


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

PROLOG         top

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

NAME         top

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

SYNOPSIS         top

       #include <stdlib.h>

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

DESCRIPTION         top

       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 thread-safe.

RETURN VALUE         top

       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         top

       No errors are defined.

       The following sections are informative.

EXAMPLES         top



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

RATIONALE         top

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



SEE ALSO         top


       The Base Definitions volume of POSIX.1‐2008, stdlib.h(0p)

       The Shell and Utilities volume of POSIX.1‐2008, uuencode(1p)

COPYRIGHT         top

       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information
       Technology -- Portable Operating System Interface (POSIX), The Open
       Group Base Specifications Issue 7, Copyright (C) 2013 by the
       Institute of Electrical and Electronics Engineers, Inc and The Open
       Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1
       applied.) 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.unix.org/online.html .

       Any typographical or formatting errors that appear in this page are
       most likely to have been introduced during the conversion of the
       source files to man page format. To report such errors, see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group                 2013                            A64L(3P)

Pages that refer to this page: stdlib.h(0p)l64a(3p)