Man page for a64l(3) and l64a(3), based on a64l.3 from the MiNT docs 0.1.

Also make a64l(3) and l64a(3) deal reasonably with inapropriate
input.  The standard does not require this, but it does not disallow
it either.

src/lib/libc/stdlib/a64l.3

@@ -0,0 +1,125 @@
+.\"
+.\" Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by Todd C. Miller.
+.\" 4. The name of the author may not be used to endorse or promote products
+.\"    derived from this software without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
+.\" INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
+.\" AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
+.\" THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+.\" EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+.\" PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+.\" OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+.\" OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+.\" ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.\" $OpenBSD: a64l.3,v 1.1 1997/08/17 22:58:33 millert Exp $
+.\"
+.Dd August 17, 1997
+.Dt A64L 3
+.Os
+.Sh NAME
+.Nm a64l ,
+.Nm l64a
+.Nd convert between 32-bit integer and radix-64 ASCII string
+.Sh SYNOPSIS
+.Fd #include <stdlib.h>
+.Ft long
+.Fn a64l "const char *s"
+.Ft char *
+.Fn l64a "long l"
+.Sh DESCRIPTION
+The
+.Fn a64l
+and
+.Fn l64a
+functions are used to maintain numbers stored in radix-64
+ASCII characters.  This is a notation by which 32-bit integers
+can be represented by up to six characters; each character
+represents a "digit" in a radix-64 notation.
+.Pp
+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.
+.Pp
+The
+.Fn 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
+.Ar s
+contains more than six characters,
+.Fn a64l
+will use the first six.
+.Fn 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.
+.Pp
+.Fn l64a
+takes a long integer argument
+.Ar l
+and returns a pointer to the corresponding radix-64 representation.
+.Sh RETURN VALUES
+On success,
+.Fn a64l
+returns a 32-bit representation of
+.Ar s .
+If
+.Ar s
+is a NULL pointer or if it contains "digits" other than those described above,
+.Fn a64l
+returns -1L and sets the global variable errno to
+.Va EINVAL .
+.Pp
+On success,
+.Fn l64a
+returns a pointer to a string containing the radix-64 representation of
+.Ar l .
+If
+.Ar l
+is 0,
+.Fn l64a
+returns a pointer to the empty string.
+If
+.Ar l
+is negative,
+.Fn l64a
+returns a NULL pointer and sets the global variable errno to
+.Va EINVAL .
+.Sh WARNINGS
+The value returned by
+.Fn l64a
+is a pointer into a static buffer, the contents of which
+will be overwritten by subsequent calls.
+.Pp
+The value returned by
+.Fn a64l
+may be incorrect if the value is too large; for that reason, only strings
+that resulted from a call to
+.Fn l64a
+should be used to call
+.Fn a64l .
+.Pp
+If a long integer is larger than 32 bits, only the low-order
+32 bits are used.
+.Sh STANDARDS
+The
+.Fn a64l                                                           
+and
+.Fn l64a
+functions conform to
+.St -xpg4.2 .

src/lib/libc/stdlib/a64l.c

@@ -4,9 +4,12 @@
  */
 
 #if defined(LIBC_SCCS) && !defined(lint)
-static char *rcsid = "$OpenBSD: a64l.c,v 1.2 1996/08/19 08:33:19 tholo Exp $";
+static char *rcsid = "$OpenBSD: a64l.c,v 1.3 1997/08/17 22:58:34 millert Exp $";
 #endif /* LIBC_SCCS and not lint */
 
+#include <errno.h>
+#include <stdlib.h>
+
 long
 a64l(s)
 	const char *s;
@@ -14,21 +17,30 @@ a64l(s)
 	long value, digit, shift;
 	int i;
 
+	if (s == NULL) {
+		errno = EINVAL;
+		return(-1L);
+	}
+
 	value = 0;
 	shift = 0;
 	for (i = 0; *s && i < 6; i++, s++) {
-		if (*s <= '/')
+		if (*s >= '.' && *s <= '/')
 			digit = *s - '.';
-		else if (*s <= '9')
+		else if (*s >= '0' && *s <= '9')
 			digit = *s - '0' + 2;
-		else if (*s <= 'Z')
+		else if (*s >= 'A' && *s <= 'Z')
 			digit = *s - 'A' + 12;
-		else
-			digit = *s - 'a' + 38; 
+		else if (*s >= 'a' && *s <= 'z')
+			digit = *s - 'a' + 38;
+		else {
+			errno = EINVAL;
+			return(-1L);
+		}
 
 		value |= digit << shift;
 		shift += 6;
 	}
 
-	return (long) value;
+	return(value);
 }

src/lib/libc/stdlib/l64a.c

@@ -4,13 +4,14 @@
  */
 
 #if defined(LIBC_SCCS) && !defined(lint)
-static char *rcsid = "$OpenBSD: l64a.c,v 1.2 1996/08/19 08:33:33 tholo Exp $";
+static char *rcsid = "$OpenBSD: l64a.c,v 1.3 1997/08/17 22:58:34 millert Exp $";
 #endif /* LIBC_SCCS and not lint */
 
+#include <errno.h>
 #include <stdlib.h>
 
 char *
-l64a (value)
+l64a(value)
 	long value;
 {
 	static char buf[8];
@@ -18,8 +19,10 @@ l64a (value)
 	int digit;
 	int i;
 
-	if (!value) 
-		return NULL;
+	if (value < 0) {
+		errno = EINVAL;
+		return(NULL);
+	}
 
 	for (i = 0; value != 0 && i < 6; i++) {
 		digit = value & 0x3f;
@@ -39,5 +42,5 @@ l64a (value)
 
 	*s = '\0';
 
-	return buf;
+	return(buf);
 }