MLINKS+=a64l.3 l64a.3 l64a_r.3

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.Dd April 21, 2003

.Dt A64L 3

.Os

.Sh NAME

.Nm a64l ,

.Nm l64a ,

.Nm l64a_r

.Nd "convert between a long integer and a base-64 ASCII string"

.Sh LIBRARY

.Lb libc

.Sh SYNOPSIS

.In stdlib.h

.Ft long

.Fn a64l "const char *s"

.Ft char *

.Fn l64a "long int l"

.Ft int

.Fn l64a_r "long int l" "char *buffer" "int buflen"

.Sh DESCRIPTION

The

.Fn a64l

and

.Fn l64a

functions convert between a long integer and its base-64 ASCII string

representation.

.Pp

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.

.Pp

.Fn a64l

takes a pointer to a NUL-terminated base-64 ASCII string

representation,

.Fa s ,

and returns the corresponding long integer value.

.Pp

.Fn l64a

takes a long integer value,

.Fa l ,

and returns a pointer to the corresponding NUL-terminated base-64

ASCII string representation.

.Pp

.Fn l64a_r

performs a conversion identical to that of

.Fn l64a

and stores the resulting representation in the memory area pointed to by

.Fa buffer ,

consuming at most

.Fa buflen

characters including the terminating NUL character.

.Sh RETURN VALUES

On successful completion,

.Fn a64l

returns the long integer value corresponding to the input string.

If the string pointed to by

.Fa s

is an empty string,

.Fn a64l

returns a value of 0L.

.Pp

.Fn l64a

returns a pointer to the base-64 ASCII string representation corresponding to

the input value.

If

.Fa l

is 0L,

.Fn l64a

returns a pointer to an empty string.

.Pp

On successful completion,

.Fn l64a_r

returns 0; if

.Fa buffer

is of insufficient length, -1 is returned.

.Sh SEE ALSO

.Xr strtol 3

.Sh STANDARDS

The

.Fn a64l

and

.Fn l64a

functions conform to

.St -xpg4.2 .

The

.Fn l64a_r

function conforms to

.St -svid4 ,

Multithreading Extension.

.Sh BUGS

The

.Fn l64a

function is not reentrant.

The value returned by it points into a static buffer area;

subsequent calls to

.Fn la64a

may overwrite this buffer.

In multi-threaded applications,

.Fn l64a_r

should be used instead.

/*

 * Written by J.T. Conklin <jtc@netbsd.org>.

 * Public domain.

 */

#include <sys/cdefs.h>

#if defined(LIBC_SCCS) && !defined(lint)

__RCSID("$NetBSD: a64l.c,v 1.8 2000/01/22 22:19:19 mycroft Exp $");

#endif /* LIBC_SCCS and not lint */

__FBSDID("$FreeBSD$");

#include "namespace.h"

#include <assert.h>

#include <limits.h>

#include <ctype.h>

#include <stdlib.h>

#ifndef _DIAGASSERT

#define _DIAGASSERT(X)

#endif

long

a64l(const char *s)

{

	long value, digit, shift;

	int i;

	_DIAGASSERT(s != NULL);

	value = 0;

	shift = 0;

	for (i = 0; *s && i < 6; i++, s++) {

		if (*s <= '/')

			digit = *s - '.';

		else if (*s <= '9')

			digit = *s - '0' + 2;

		else if (*s <= 'Z')

			digit = *s - 'A' + 12;

		else

			digit = *s - 'a' + 38; 

		value |= digit << shift;

		shift += 6;

	}

	return (value);

}

/*

 * Written by J.T. Conklin <jtc@netbsd.org>.

 * Public domain.

 */

#include <sys/cdefs.h>

#if defined(LIBC_SCCS) && !defined(lint)

__RCSID("$NetBSD: l64a.c,v 1.12 2000/01/22 22:19:19 mycroft Exp $");

#endif /* LIBC_SCCS and not lint */

__FBSDID("$FreeBSD$");

#include "namespace.h"

#include <assert.h>

#include <errno.h>

#include <stdlib.h>

#ifndef _DIAGASSERT

#define _DIAGASSERT(X)

#endif

char *

l64a (long value)

{

	static char buf[8];

	(void)l64a_r(value, buf, sizeof (buf));

	return buf;

}

int

l64a_r (long value, char *buffer, int buflen)

{

	char *s = buffer;

	int digit;

	unsigned long v = value;

	_DIAGASSERT(buffer != NULL);

	if (value == 0UL) 

		goto out;

	for (; v != 0 && buflen > 1; s++, buflen--) {

		digit = (int)(v & 0x3f);

		if (digit < 2) 

			*s = digit + '.';

		else if (digit < 12)

			*s = digit + '0' - 2;

		else if (digit < 38)

			*s = digit + 'A' - 12;

		else

			*s = digit + 'a' - 38;

		v >>= 6;

	}

out:

	*s = '\0';

	return (v == 0UL ? 0 : -1);

}

int	 l64a_r (long, char *, int);