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