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/*
* 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 3265 2007-10-08 19:52:55Z andreas $
*/
#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;
}
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