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A64L(3P) POSIX Programmer's Manual A64L(3P)
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.
a64l, l64a — convert between a 32-bit integer and a radix-64 ASCII
string
#include <stdlib.h>
long a64l(const char *s);
char *l64a(long value);
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.
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.
No errors are defined.
The following sections are informative.
None.
If the type long contains more than 32 bits, the result of
a64l(l64a(x)) is x in the low-order 32 bits.
This is not the same encoding as used by either encoding variant of
the uuencode utility.
None.
strtoul(3p)
The Base Definitions volume of POSIX.1‐2008, stdlib.h(0p)
The Shell and Utilities volume of POSIX.1‐2008, uuencode(1p)
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)