l64a_r(3) [freebsd man page]

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 corre-
     sponding long value.  If the string pointed to by s contains more than six characters, a64l() uses the first six.	If the first six charac-
     ters of the string contain a null terminator, a64l() uses only characters preceding the null terminator.  The a64l() function scans the char-
     acter 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
     unspecified if value is negative.

     The value returned by l64a() is a pointer into a static buffer.  Subsequent 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

Check Out this Related Man Page

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

NAME

     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

Linux and UNIX Man Pages

l64a_r(3) [freebsd man page]

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