Add a64l(), l64a(), and l64a_r() XSI extentions. These functions convert

between a 32-bit integer and a radix-64 ASCII string.  The l64a_r() function
is a NetBSD addition.

PR:		51209 (based on submission, but very different)
Reviewed by:	bde, ru

1 files changed, 46 insertions, 0 deletions

diff --git a/lib/libc/stdlib/a64l.c b/lib/libc/stdlib/a64l.c
new file mode 100644
index 0000000..6d175ef
--- /dev/null
+++ b/lib/libc/stdlib/a64l.c
@@ -0,0 +1,46 @@
+/*-
+ * Written by J.T. Conklin <jtc@netbsd.org>.
+ * 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 $");
+#endif /* not lint */
+#endif
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <stdlib.h>
+#include <inttypes.h>
+
+#define	ADOT	46		/* ASCII '.' */
+#define	ASLASH	ADOT + 1	/* 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);
+}