1/*
2 * Written by J.T. Conklin <jtc@netbsd.org>.
3 * Public domain.
4 */
5
6#if defined(LIBC_SCCS) && !defined(lint)
7static char *rcsid = "$OpenBSD: a64l.c,v 1.3 1997/08/17 22:58:34 millert Exp $";
8#endif /* LIBC_SCCS and not lint */
9
10#include <errno.h>
11#include <stdlib.h>
12
13long
14a64l(s)
15	const char *s;
16{
17	int value, digit, shift;
18	int i;
19
20	if (s == NULL) {
21		errno = EINVAL;
22		return(-1L);
23	}
24
25	value = 0;
26	shift = 0;
27	for (i = 0; *s && i < 6; i++, s++) {
28		if (*s >= '.' && *s <= '/')
29			digit = *s - '.';
30		else if (*s >= '0' && *s <= '9')
31			digit = *s - '0' + 2;
32		else if (*s >= 'A' && *s <= 'Z')
33			digit = *s - 'A' + 12;
34		else if (*s >= 'a' && *s <= 'z')
35			digit = *s - 'a' + 38;
36		else {
37			errno = EINVAL;
38			return(-1L);
39		}
40
41		value |= digit << shift;
42		shift += 6;
43	}
44
45	return(value);
46}
47
48