{"id":6745,"date":"2022-12-20T19:33:34","date_gmt":"2022-12-20T22:33:34","guid":{"rendered":"http:\/\/lode.uno\/linux-man\/index.php\/2022\/12\/20\/a64l-man3\/"},"modified":"2022-12-20T19:33:34","modified_gmt":"2022-12-20T22:33:34","slug":"a64l-man3","status":"publish","type":"post","link":"https:\/\/lode.uno\/linux-man\/2022\/12\/20\/a64l-man3\/","title":{"rendered":"A64L (man3)"},"content":{"rendered":"

A64L<\/h1>\n

NAME<\/a>
SYNOPSIS<\/a>
DESCRIPTION<\/a>
ATTRIBUTES<\/a>
CONFORMING TO<\/a>
NOTES<\/a>
SEE ALSO<\/a>
COLOPHON<\/a> <\/p>\n

\n

NAME <\/a> <\/h2>\n

a64l, l64a \u2212 convert between long and base-64<\/p>\n

SYNOPSIS <\/a> <\/h2>\n

#include <\/b><\/p>\n

long a64l(const char *<\/b>str64<\/i>);<\/b><\/p>\n

char *l64a(long<\/b> value<\/i>);<\/b><\/p>\n

Feature Test Macro Requirements for glibc (see feature_test_macros<\/b>(7)):<\/p>\n

a64l<\/b>(), l64a<\/b>():<\/p>\n

_XOPEN_SOURCE\u00a0>=\u00a0500
|| \/bin \/boot \/dead.letter \/dev \/etc \/home \/initrd \/lib \/lib64 \/lost+found \/media \/mnt \/opt \/proc \/release-notes.html \/release-notes.txt \/root \/run \/sbin \/srv \/sys \/tmp \/usr \/var Glibc since 2.19: bodies\/ usr\/ _DEFAULT_SOURCE
|| \/bin \/boot \/dead.letter \/dev \/etc \/home \/initrd \/lib \/lib64 \/lost+found \/media \/mnt \/opt \/proc \/release-notes.html \/release-notes.txt \/root \/run \/sbin \/srv \/sys \/tmp \/usr \/var Glibc versions <= 2.19: bodies\/ usr\/ _SVID_SOURCE<\/p>\n

DESCRIPTION <\/a> <\/h2>\n

These functions provide a conversion between 32-bit long integers and little-endian base-64 ASCII strings (of length zero to six). If the string used as argument for a64l<\/b>() has length greater than six, only the first six bytes are used. If the type long<\/i> has more than 32 bits, then l64a<\/b>() uses only the low order 32 bits of value<\/i>, and a64l<\/b>() sign-extends its 32-bit result.<\/p>\n

The 64 digits in the base-64 system are:<\/p>\n\n\n\n\n\n\n\n\n\n\n\n
<\/td>\n<\/td>\n<\/td>\n\n

‘.’<\/p>\n<\/td>\n<\/tr>\n

<\/td>\n<\/td>\n<\/td>\n\n

represents a 0<\/p>\n<\/td>\n<\/tr>\n

<\/td>\n<\/td>\n<\/td>\n\n

‘\/’<\/p>\n<\/td>\n<\/tr>\n

<\/td>\n<\/td>\n<\/td>\n\n

represents a 1<\/p>\n<\/td>\n<\/tr>\n

<\/td>\n<\/td>\n<\/td>\n\n

0-9<\/p>\n<\/td>\n<\/tr>\n

<\/td>\n<\/td>\n<\/td>\n\n

represent 2-11<\/p>\n<\/td>\n<\/tr>\n

<\/td>\n<\/td>\n<\/td>\n\n

A-Z<\/p>\n<\/td>\n<\/tr>\n

<\/td>\n<\/td>\n<\/td>\n\n

represent 12-37<\/p>\n<\/td>\n<\/tr>\n

<\/td>\n<\/td>\n<\/td>\n\n

a-z<\/p>\n<\/td>\n<\/tr>\n

<\/td>\n<\/td>\n<\/td>\n\n

represent 38-63<\/p>\n<\/td>\n<\/tr>\n<\/table>\n

So 123 = 59*64^0 + 1*64^1 = “v\/”.<\/p>\n

ATTRIBUTES <\/a> <\/h2>\n

For an explanation of the terms used in this section, see attributes<\/b>(7).<\/p>\n\n\n\n\n
<\/td>\n <\/td>\n <\/td>\n<\/td>\n<\/td>\n <\/td>\n<\/tr>\n
<\/td>\n<\/td>\n <\/td>\n<\/td>\n<\/td>\n <\/td>\n<\/tr>\n
<\/td>\n<\/td>\n <\/td>\n<\/td>\n<\/td>\n <\/td>\n<\/tr>\n<\/table>\n

\"Image<\/p>\n

CONFORMING TO <\/a> <\/h2>\n

POSIX.1-2001, POSIX.1-2008.<\/p>\n

NOTES <\/a> <\/h2>\n

The value returned by l64a<\/b>() may be a pointer to a static buffer, possibly overwritten by later calls.<\/p>\n

The behavior of l64a<\/b>() is undefined when value<\/i> is negative. If value<\/i> is zero, it returns an empty string.<\/p>\n

These functions are broken in glibc before 2.2.5 (puts most significant digit first).<\/p>\n

This is not the encoding used by uuencode<\/b>(1).<\/p>\n

SEE ALSO <\/a> <\/h2>\n

uuencode<\/b>(1), strtoul<\/b>(3)<\/p>\n

COLOPHON <\/a> <\/h2>\n

This page is part of release 5.10 of the Linux man-pages<\/i> project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https:\/\/www.kernel.org\/doc\/man\u2212pages\/.<\/p>\n

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