a64l.c

/*-
 * Written by J.T. Conklin <[email protected]>.
 * Public domain.
 */

#if 0
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: a64l.c,v 1.8 2000/01/22 22:19:19 mycroft Exp $");
#endif /* not lint */
#endif

#include <sys/cdefs.h>
#include <stdlib.h>
#include <inttypes.h>

#define	ADOT	46		/* ASCII '.' */
#define	ASLASH	47		/* ASCII '/' */
#define	A0	48		/* ASCII '0' */
#define	AA	65		/* ASCII 'A' */
#define	Aa	97		/* ASCII 'a' */

long
a64l(const char *s)
{
	long shift;
	int digit, i, value;

	value = 0;
	shift = 0;
	for (i = 0; *s != '\0' && i < 6; i++, s++) {
		if (*s <= ASLASH)
			digit = *s - ASLASH + 1;
		else if (*s <= A0 + 9)
			digit = *s - A0 + 2;
		else if (*s <= AA + 25)
			digit = *s - AA + 12;
		else
			digit = *s - Aa + 38;

		value |= digit << shift;
		shift += 6;
	}
	return (value);
}