[apple/libc.git] / net / FreeBSD / inet_net_ntop.c

/*
 * Copyright (c) 1996 by Internet Software Consortium.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 * SOFTWARE.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static const char orig_rcsid[] = "From Id: inet_net_ntop.c,v 8.2 1996/08/08 06:54:44 vixie Exp";
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/lib/libc/net/inet_net_ntop.c,v 1.7 2002/03/22 21:52:29 obrien Exp $");

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

#ifdef SPRINTF_CHAR
# define SPRINTF(x) strlen(sprintf/**/x)
#else
# define SPRINTF(x) ((size_t)sprintf x)
#endif

static char *	inet_net_ntop_ipv4(const u_char *src, int bits, char *dst,
		    size_t size);

/*
 * char *
 * inet_net_ntop(af, src, bits, dst, size)
 *	convert network number from network to presentation format.
 *	generates CIDR style result always.
 * return:
 *	pointer to dst, or NULL if an error occurred (check errno).
 * author:
 *	Paul Vixie (ISC), July 1996
 */
char *
inet_net_ntop(af, src, bits, dst, size)
	int af;
	const void *src;
	int bits;
	char *dst;
	size_t size;
{
	switch (af) {
	case AF_INET:
		return (inet_net_ntop_ipv4(src, bits, dst, size));
	default:
		errno = EAFNOSUPPORT;
		return (NULL);
	}
}

/*
 * static char *
 * inet_net_ntop_ipv4(src, bits, dst, size)
 *	convert IPv4 network number from network to presentation format.
 *	generates CIDR style result always.
 * return:
 *	pointer to dst, or NULL if an error occurred (check errno).
 * note:
 *	network byte order assumed.  this means 192.5.5.240/28 has
 *	0x11110000 in its fourth octet.
 * author:
 *	Paul Vixie (ISC), July 1996
 */
static char *
inet_net_ntop_ipv4(src, bits, dst, size)
	const u_char *src;
	int bits;
	char *dst;
	size_t size;
{
	char *odst = dst;
	char *t;
	u_int m;
	int b;

	if (bits < 0 || bits > 32) {
		errno = EINVAL;
		return (NULL);
	}
	if (bits == 0) {
		if (size < sizeof "0")
			goto emsgsize;
		*dst++ = '0';
		*dst = '\0';
	}

	/* Format whole octets. */
	for (b = bits / 8; b > 0; b--) {
		if (size < sizeof "255.")
			goto emsgsize;
		t = dst;
		dst += SPRINTF((dst, "%u", *src++));
		if (b > 1) {
			*dst++ = '.';
			*dst = '\0';
		}
		size -= (size_t)(dst - t);
	}

	/* Format partial octet. */
	b = bits % 8;
	if (b > 0) {
		if (size < sizeof ".255")
			goto emsgsize;
		t = dst;
		if (dst != odst)
			*dst++ = '.';
		m = ((1 << b) - 1) << (8 - b);
		dst += SPRINTF((dst, "%u", *src & m));
		size -= (size_t)(dst - t);
	}

	/* Format CIDR /width. */
	if (size < sizeof "/32")
		goto emsgsize;
	dst += SPRINTF((dst, "/%u", bits));
	return (odst);

 emsgsize:
	errno = EMSGSIZE;
	return (NULL);
}

/*
 * Weak aliases for applications that use certain private entry points,
 * and fail to include <arpa/inet.h>.
 */
#undef inet_net_ntop
__weak_reference(__inet_net_ntop, inet_net_ntop);
Commit	Line	Data
9385eb3d A	1	/*
	2	* Copyright (c) 1996 by Internet Software Consortium.
	3	*
	4	* Permission to use, copy, modify, and distribute this software for any
	5	* purpose with or without fee is hereby granted, provided that the above
	6	* copyright notice and this permission notice appear in all copies.
	7	*
	8	* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
	9	* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
	10	* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
	11	* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
	12	* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
	13	* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
	14	* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
	15	* SOFTWARE.
	16	*/
	17
	18	#if defined(LIBC_SCCS) && !defined(lint)
	19	static const char orig_rcsid[] = "From Id: inet_net_ntop.c,v 8.2 1996/08/08 06:54:44 vixie Exp";
	20	#endif
	21	#include <sys/cdefs.h>
	22	__FBSDID("$FreeBSD: src/lib/libc/net/inet_net_ntop.c,v 1.7 2002/03/22 21:52:29 obrien Exp $");
	23
	24	#include <sys/types.h>
	25	#include <sys/socket.h>
	26	#include <netinet/in.h>
	27	#include <arpa/inet.h>
	28
	29	#include <errno.h>
	30	#include <stdio.h>
	31	#include <string.h>
	32	#include <stdlib.h>
	33
	34	#ifdef SPRINTF_CHAR
	35	# define SPRINTF(x) strlen(sprintf/**/x)
	36	#else
	37	# define SPRINTF(x) ((size_t)sprintf x)
	38	#endif
	39
	40	static char * inet_net_ntop_ipv4(const u_char src, int bits, char dst,
	41	size_t size);
	42
	43	/*
	44	* char *
	45	* inet_net_ntop(af, src, bits, dst, size)
	46	* convert network number from network to presentation format.
	47	* generates CIDR style result always.
	48	* return:
	49	* pointer to dst, or NULL if an error occurred (check errno).
	50	* author:
	51	* Paul Vixie (ISC), July 1996
	52	*/
	53	char *
	54	inet_net_ntop(af, src, bits, dst, size)
	55	int af;
	56	const void *src;
	57	int bits;
	58	char *dst;
	59	size_t size;
	60	{
	61	switch (af) {
	62	case AF_INET:
	63	return (inet_net_ntop_ipv4(src, bits, dst, size));
	64	default:
65	errno = EAFNOSUPPORT;
66	return (NULL);
67	}
68	}
69
70	/*
71	* static char *
72	* inet_net_ntop_ipv4(src, bits, dst, size)
73	* convert IPv4 network number from network to presentation format.
74	* generates CIDR style result always.
75	* return:
76	* pointer to dst, or NULL if an error occurred (check errno).
77	* note:
78	* network byte order assumed. this means 192.5.5.240/28 has
79	* 0x11110000 in its fourth octet.
80	* author:
81	* Paul Vixie (ISC), July 1996
82	*/
83	static char *
84	inet_net_ntop_ipv4(src, bits, dst, size)
85	const u_char *src;
86	int bits;
87	char *dst;
88	size_t size;
89	{
90	char *odst = dst;
91	char *t;
92	u_int m;
93	int b;
94
95	if (bits < 0 \|\| bits > 32) {
96	errno = EINVAL;
97	return (NULL);
98	}
99	if (bits == 0) {
100	if (size < sizeof "0")
101	goto emsgsize;
102	*dst++ = '0';
103	*dst = '\0';
104	}
105
106	/* Format whole octets. */
107	for (b = bits / 8; b > 0; b--) {
108	if (size < sizeof "255.")
109	goto emsgsize;
110	t = dst;
111	dst += SPRINTF((dst, "%u", *src++));
112	if (b > 1) {
113	*dst++ = '.';
114	*dst = '\0';
115	}
116	size -= (size_t)(dst - t);
117	}
118
119	/* Format partial octet. */
120	b = bits % 8;
121	if (b > 0) {
122	if (size < sizeof ".255")
123	goto emsgsize;
124	t = dst;
125	if (dst != odst)
126	*dst++ = '.';
127	m = ((1 << b) - 1) << (8 - b);
128	dst += SPRINTF((dst, "%u", *src & m));
129	size -= (size_t)(dst - t);
130	}
131
132	/* Format CIDR /width. */
133	if (size < sizeof "/32")
134	goto emsgsize;
135	dst += SPRINTF((dst, "/%u", bits));
136	return (odst);
137
138	emsgsize:
139	errno = EMSGSIZE;
140	return (NULL);
141	}
142
143	/*
144	* Weak aliases for applications that use certain private entry points,
145	* and fail to include <arpa/inet.h>.
146	*/
147	#undef inet_net_ntop
148	__weak_reference(__inet_net_ntop, inet_net_ntop);