src/libfreeswan/addrtoa.c

@@ -0,0 +1,68 @@
+/*
+ * addresses to ASCII
+ * Copyright (C) 1998, 1999  Henry Spencer.
+ * 
+ * This library is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Library General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/lgpl.txt>.
+ * 
+ * This library is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
+ * License for more details.
+ *
+ * RCSID $Id: addrtoa.c,v 1.1 2004/03/15 20:35:25 as Exp $
+ */
+#include "internal.h"
+#include "freeswan.h"
+
+#define	NBYTES	4		/* bytes in an address */
+#define	PERBYTE	4		/* three digits plus a dot or NUL */
+#define	BUFLEN	(NBYTES*PERBYTE)
+
+#if BUFLEN != ADDRTOA_BUF
+#error	"ADDRTOA_BUF in freeswan.h inconsistent with addrtoa() code"
+#endif
+
+/*
+ - addrtoa - convert binary address to ASCII dotted decimal
+ */
+size_t				/* space needed for full conversion */
+addrtoa(addr, format, dst, dstlen)
+struct in_addr addr;
+int format;			/* character */
+char *dst;			/* need not be valid if dstlen is 0 */
+size_t dstlen;
+{
+	unsigned long a = ntohl(addr.s_addr);
+	int i;
+	size_t n;
+	unsigned long byte;
+	char buf[BUFLEN];
+	char *p;
+
+	switch (format) {
+	case 0:
+		break;
+	default:
+		return 0;
+		break;
+	}
+
+	p = buf;
+	for (i = NBYTES-1; i >= 0; i--) {
+		byte = (a >> (i*8)) & 0xff;
+		p += ultoa(byte, 10, p, PERBYTE);
+		if (i != 0)
+			*(p-1) = '.';
+	}
+	n = p - buf;
+
+	if (dstlen > 0) {
+		if (n > dstlen)
+			buf[dstlen - 1] = '\0';
+		strcpy(dst, buf);
+	}
+	return n;
+}