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PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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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.1‐2017, stdlib.h(0p)
The Shell and Utilities volume of POSIX.1‐2017, uuencode(1p)
Portions of this text are reprinted and reproduced in electronic
form from IEEE Std 1003.1-2017, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The
Open Group Base Specifications Issue 7, 2018 Edition, Copyright
(C) 2018 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 .
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 2017 A64L(3P)
Pages that refer to this page: stdlib.h(0p), l64a(3p)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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