Linux and UNIX Man Pages

Linux & Unix Commands - Search Man Pages

a64l(3) [v7 man page]

A64L(3) 						     Linux Programmer's Manual							   A64L(3)

a64l, l64a - convert between long and base-64 SYNOPSIS
#include <stdlib.h> long a64l(const char *str64); char *l64a(long value); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): a64l(), l64a(): _XOPEN_SOURCE >= 500 || /* Glibc since 2.19: */ _DEFAULT_SOURCE || /* Glibc versions <= 2.19: */ _SVID_SOURCE 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 the type long has 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 0-9 represent 2-11 A-Z represent 12-37 a-z represent 38-63 So 123 = 59*64^0 + 1*64^1 = "v/". ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7). +----------+---------------+---------------------+ |Interface | Attribute | Value | +----------+---------------+---------------------+ |l64a() | Thread safety | MT-Unsafe race:l64a | +----------+---------------+---------------------+ |a64l() | Thread safety | MT-Safe | +----------+---------------+---------------------+ CONFORMING TO
POSIX.1-2001, POSIX.1-2008. NOTES
The value returned by l64a() may be a pointer to a static buffer, possibly overwritten by later calls. The behavior 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). This is not the encoding used by uuencode(1). SEE ALSO
uuencode(1), strtoul(3) COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at 2016-03-15 A64L(3)

Check Out this Related Man Page

A64L(3) 						   BSD Library Functions Manual 						   A64L(3)

a64l, l64a -- convert between 32-bit integer and radix-64 ASCII string SYNOPSIS
#include <stdlib.h> long a64l(const char *s); char * l64a(long value); DESCRIPTION
The a64l() and l64a() functions are used to maintain numbers stored in radix-64 ASCII characters. This is a notation by which 32-bit inte- gers can be represented by up to six characters; each character represents a ``digit'' in a radix-64 notation. The characters used to represent digits are '.' 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 takes a pointer to a null-terminated radix-64 representation and returns a corresponding 32-bit value. If the string pointed to by s contains more than six characters, a64l() will use the first six. a64l() scans the character string from left to right, decoding each character as a 6-bit radix-64 number. If a long integer is larger than 32 bits, the return value will be sign-extended. l64a() takes a long integer argument value and returns a pointer to the corresponding radix-64 representation. RETURN VALUES
On success, a64l() returns a 32-bit representation of s. If s is a null pointer or if it contains digits other than those described above. a64l() returns -1 and sets the global variable errno to EINVAL. On success, l64a() returns a pointer to a string containing the radix-64 representation of value. If value is 0, l64a() returns a pointer to the empty string. If value is negative, l64a() returns a null pointer and sets the global variable errno to EINVAL. WARNINGS
The value returned by l64a() is a pointer into a static buffer, the contents of which will be overwritten by subsequent calls. The value returned by a64l() may be incorrect if the value is too large; for that reason, only strings that resulted from a call to l64a() should be used to call a64l(). If a long integer is larger than 32 bits, only the low-order 32 bits are used. STANDARDS
The a64l() and l64a() functions conform to X/Open Portability Guide Issue 4, Version 2 (``XPG4.2''). BSD
August 17, 1997 BSD
Man Page