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A64L (3) | C library functions | Unix Manual Pages | :man

NAME

a64l, l64a - convert between long and base-64

CONTENTS

Synopsis
Description
Notes

SYNOPSIS

#include <stdlib.h>

"long a64l(char *"str64);

"char *l64a(long "value);

DESCRIPTION

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() has length greater than six, only the first six bytes are used. If longs have more than 32 bits, then l64a() uses only the low order 32 bits of value, and a64l() sign-extends its 32-bit result.

The 64 digits in the base 64 system are:
’.’represents a 0
’/’represents a 1
0-9represent 2-11
A-Zrepresent 12-37
a-zrepresent 38-63


So 123 = 59*64^0 + 1*64^1 = "v/".

NOTES

The value returned by a64l() may be a pointer to a static buffer, possibly overwritten by later calls.

The behaviour of l64a() is undefined when value is negative. If value is zero, it returns an empty string.

These functions are broken in glibc before 2.2.5 (puts most significant digit first).

"CONFORMING TO"

XPG 4.2, POSIX 1003.1-2001.

"SEE ALSO"

uuencode(1), itoa(3), strtoul(3)


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