Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages

  
 
  

home | help
A64L(3)			 BSD Library Functions Manual		       A64L(3)

NAME
     a64l, l64a, l64a_r	-- convert between a long integer and a	base-64	ASCII
     string

LIBRARY
     Standard C	Library	(libc, -lc)

SYNOPSIS
     #include <stdlib.h>

     long
     a64l(const	char *s);

     char *
     l64a(long int l);

     int
     l64a_r(long int l,	char *buffer, int buflen);

DESCRIPTION
     These functions are used to maintain numbers stored in radix-64 ASCII
     characters.  This is a notation by	which 32-bit integers can be repre-
     sented 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 are used	for these operations.

     The characters used to represent "digits" are `.' for 0, `/' for 1, `0' -
     `9' for 2 - 11, `A' - `Z' for 12 -	37, and	`a' - `z' for 38 - 63.

     The a64l()	function takes a pointer to a radix-64 representation, in
     which the first digit is the least	significant, and returns a correspond-
     ing long value.  If the string pointed to by s contains more than six
     characters, a64l()	uses the first six.  If	the first six characters of
     the string	contain	a null terminator, a64l() uses only characters preced-
     ing the null terminator.  The a64l() function scans 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 takes a long argument and returns a pointer to	the
     corresponding radix-64 representation.  The behavior of l64a() is unspec-
     ified if value is negative.

     The value returned	by l64a() is a pointer into a static buffer.  Subse-
     quent calls to l64a() may overwrite the buffer.

     The l64a_r() function performs a conversion identical to that of l64a()
     and stores	the resulting representation in	the memory area	pointed	to by
     buffer, consuming at most buflen characters including the terminating NUL
     character.

RETURN VALUES
     On	successful completion, a64l() returns the long value resulting from
     conversion	of the input string.  If a string pointed to by	s is an	empty
     string, a64l() returns 0.

     The l64a()	function returns a pointer to the radix-64 representation.  If
     value is 0, l64a()	returns	a pointer to an	empty string.

SEE ALSO
     strtoul(3)

HISTORY
     The a64l(), l64a(), and l64a_r() functions	are derived from NetBSD	with
     modifications.  They appeared in FreeBSD 6.1.

AUTHORS
     The a64l(), l64a(), and l64a_r() functions	were added to FreeBSD by Tom
     Rhodes <trhodes@FreeBSD.org>.  Almost all of this manual page came	from
     the POSIX standard.

BSD			       November	20, 2005			   BSD

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | SEE ALSO | HISTORY | AUTHORS

Want to link to this manual page? Use this URL:
<https://www.freebsd.org/cgi/man.cgi?query=a64l&sektion=3&manpath=FreeBSD+12.0-RELEASE+and+Ports>

home | help