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

/*
 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
 * Copyright (c) 1996,1999 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 ISC DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC 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 rcsid[] = "$Id: inet_net_pton.c,v 1.7.18.2 2008/08/26 04:42:43 marka Exp $";
#endif

/* the algorithms only can deal with ASCII, so we optimize for it */
#define USE_ASCII

#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/lib/libc/inet/inet_net_pton.c,v 1.4 2008/12/14 19:39:53 ume Exp $");

#include "port_before.h"

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

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

#include "port_after.h"

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

/*%
 * static int
 * inet_net_pton_ipv4(src, dst, size)
 *	convert IPv4 network number from presentation to network format.
 *	accepts hex octets, hex strings, decimal octets, and /CIDR.
 *	"size" is in bytes and describes "dst".
 * return:
 *	number of bits, either imputed classfully or specified with /CIDR,
 *	or -1 if some failure occurred (check errno).  ENOENT means it was
 *	not an IPv4 network specification.
 * note:
 *	network byte order assumed.  this means 192.5.5.240/28 has
 *	0b11110000 in its fourth octet.
 * author:
 *	Paul Vixie (ISC), June 1996
 */
static int
inet_net_pton_ipv4(const char *src, u_char *dst, size_t size) {
	static const char xdigits[] = "0123456789abcdef";
	static const char digits[] = "0123456789";
	int n, ch, tmp = 0, dirty, bits;
	const u_char *odst = dst;

	ch = *src++;
	if (ch == '0' && (src[0] == 'x' || src[0] == 'X')
	    && isascii((unsigned char)(src[1]))
	    && isxdigit((unsigned char)(src[1]))) {
		/* Hexadecimal: Eat nybble string. */
		if (size <= 0U)
			goto emsgsize;
		dirty = 0;
		src++;	/*%< skip x or X. */
		while ((ch = *src++) != '\0' && isascii(ch) && isxdigit(ch)) {
			if (isupper(ch))
				ch = tolower(ch);
			n = strchr(xdigits, ch) - xdigits;
			assert(n >= 0 && n <= 15);
			if (dirty == 0)
				tmp = n;
			else
				tmp = (tmp << 4) | n;
			if (++dirty == 2) {
				if (size-- <= 0U)
					goto emsgsize;
				*dst++ = (u_char) tmp;
				dirty = 0;
			}
		}
		if (dirty) {  /*%< Odd trailing nybble? */
			if (size-- <= 0U)
				goto emsgsize;
			*dst++ = (u_char) (tmp << 4);
		}
	} else if (isascii(ch) && isdigit(ch)) {
		/* Decimal: eat dotted digit string. */
		for (;;) {
			tmp = 0;
			do {
				n = strchr(digits, ch) - digits;
				assert(n >= 0 && n <= 9);
				tmp *= 10;
				tmp += n;
				if (tmp > 255)
					goto enoent;
			} while ((ch = *src++) != '\0' &&
				 isascii(ch) && isdigit(ch));
			if (size-- <= 0U)
				goto emsgsize;
			*dst++ = (u_char) tmp;
			if (ch == '\0' || ch == '/')
				break;
			if (ch != '.')
				goto enoent;
			ch = *src++;
			if (!isascii(ch) || !isdigit(ch))
				goto enoent;
		}
	} else
		goto enoent;

	bits = -1;
	if (ch == '/' && isascii((unsigned char)(src[0])) &&
	    isdigit((unsigned char)(src[0])) && dst > odst) {
		/* CIDR width specifier.  Nothing can follow it. */
		ch = *src++;	/*%< Skip over the /. */
		bits = 0;
		do {
			n = strchr(digits, ch) - digits;
			assert(n >= 0 && n <= 9);
			bits *= 10;
			bits += n;
			if (bits > 32)
				goto enoent;
		} while ((ch = *src++) != '\0' && isascii(ch) && isdigit(ch));
		if (ch != '\0')
			goto enoent;
	}

	/* Firey death and destruction unless we prefetched EOS. */
	if (ch != '\0')
		goto enoent;

	/* If nothing was written to the destination, we found no address. */
	if (dst == odst)
		goto enoent;
	/* If no CIDR spec was given, infer width from net class. */
	if (bits == -1) {
		if (*odst >= 240)	/*%< Class E */
			bits = 32;
		else if (*odst >= 224)	/*%< Class D */
			bits = 8;
		else if (*odst >= 192)	/*%< Class C */
			bits = 24;
		else if (*odst >= 128)	/*%< Class B */
			bits = 16;
		else			/*%< Class A */
			bits = 8;
		/* If imputed mask is narrower than specified octets, widen. */
		if (bits < ((dst - odst) * 8))
			bits = (dst - odst) * 8;
		/*
		 * If there are no additional bits specified for a class D
		 * address adjust bits to 4.
		 */
		if (bits == 8 && *odst == 224)
			bits = 4;
	}
	/* Extend network to cover the actual mask. */
	while (bits > ((dst - odst) * 8)) {
		if (size-- <= 0U)
			goto emsgsize;
		*dst++ = '\0';
	}
	return (bits);

 enoent:
	errno = ENOENT;
	return (-1);

 emsgsize:
	errno = EMSGSIZE;
	return (-1);
}

static int
getbits(const char *src, int *bitsp) {
	static const char digits[] = "0123456789";
	int n;
	int val;
	char ch;

	val = 0;
	n = 0;
	while ((ch = *src++) != '\0') {
		const char *pch;

		pch = strchr(digits, ch);
		if (pch != NULL) {
			if (n++ != 0 && val == 0)	/*%< no leading zeros */
				return (0);
			val *= 10;
			val += (pch - digits);
			if (val > 128)			/*%< range */
				return (0);
			continue;
		}
		return (0);
	}
	if (n == 0)
		return (0);
	*bitsp = val;
	return (1);
}

static int
getv4(const char *src, u_char *dst, int *bitsp) {
	static const char digits[] = "0123456789";
	u_char *odst = dst;
	int n;
	u_int val;
	char ch;

	val = 0;
	n = 0;
	while ((ch = *src++) != '\0') {
		const char *pch;

		pch = strchr(digits, ch);
		if (pch != NULL) {
			if (n++ != 0 && val == 0)	/*%< no leading zeros */
				return (0);
			val *= 10;
			val += (pch - digits);
			if (val > 255)			/*%< range */
				return (0);
			continue;
		}
		if (ch == '.' || ch == '/') {
			if (dst - odst > 3)		/*%< too many octets? */
				return (0);
			*dst++ = val;
			if (ch == '/')
				return (getbits(src, bitsp));
			val = 0;
			n = 0;
			continue;
		}
		return (0);
	}
	if (n == 0)
		return (0);
	if (dst - odst > 3)		/*%< too many octets? */
		return (0);
	*dst++ = val;
	return (1);
}

static int
inet_net_pton_ipv6(const char *src, u_char *dst, size_t size) {
	static const char xdigits_l[] = "0123456789abcdef",
			  xdigits_u[] = "0123456789ABCDEF";
	u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
	const char *xdigits, *curtok;
	int ch, saw_xdigit;
	u_int val;
	int digits;
	int bits;
	size_t bytes;
	int words;
	int ipv4;

	memset((tp = tmp), '\0', NS_IN6ADDRSZ);
	endp = tp + NS_IN6ADDRSZ;
	colonp = NULL;
	/* Leading :: requires some special handling. */
	if (*src == ':')
		if (*++src != ':')
			goto enoent;
	curtok = src;
	saw_xdigit = 0;
	val = 0;
	digits = 0;
	bits = -1;
	ipv4 = 0;
	while ((ch = *src++) != '\0') {
		const char *pch;

		if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
			pch = strchr((xdigits = xdigits_u), ch);
		if (pch != NULL) {
			val <<= 4;
			val |= (pch - xdigits);
			if (++digits > 4)
				goto enoent;
			saw_xdigit = 1;
			continue;
		}
		if (ch == ':') {
			curtok = src;
			if (!saw_xdigit) {
				if (colonp)
					goto enoent;
				colonp = tp;
				continue;
			} else if (*src == '\0')
				goto enoent;
			if (tp + NS_INT16SZ > endp)
				return (0);
			*tp++ = (u_char) (val >> 8) & 0xff;
			*tp++ = (u_char) val & 0xff;
			saw_xdigit = 0;
			digits = 0;
			val = 0;
			continue;
		}
		if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
		     getv4(curtok, tp, &bits) > 0) {
			tp += NS_INADDRSZ;
			saw_xdigit = 0;
			ipv4 = 1;
			break;	/*%< '\\0' was seen by inet_pton4(). */
		}
		if (ch == '/' && getbits(src, &bits) > 0)
			break;
		goto enoent;
	}
	if (saw_xdigit) {
		if (tp + NS_INT16SZ > endp)
			goto enoent;
		*tp++ = (u_char) (val >> 8) & 0xff;
		*tp++ = (u_char) val & 0xff;
	}
	if (bits == -1)
		bits = 128;

	words = (bits + 15) / 16;
	if (words < 2)
		words = 2;
	if (ipv4)
		words = 8;
	endp =  tmp + 2 * words;

	if (colonp != NULL) {
		/*
		 * Since some memmove()'s erroneously fail to handle
		 * overlapping regions, we'll do the shift by hand.
		 */
		const int n = tp - colonp;
		int i;

		if (tp == endp)
			goto enoent;
		for (i = 1; i <= n; i++) {
			endp[- i] = colonp[n - i];
			colonp[n - i] = 0;
		}
		tp = endp;
	}
	if (tp != endp)
		goto enoent;

	bytes = (bits + 7) / 8;
	if (bytes > size)
		goto emsgsize;
	memcpy(dst, tmp, bytes);
	return (bits);

 enoent:
	errno = ENOENT;
	return (-1);

 emsgsize:
	errno = EMSGSIZE;
	return (-1);
}

/*%
 * int
 * inet_net_pton(af, src, dst, size)
 *	convert network number from presentation to network format.
 *	accepts hex octets, hex strings, decimal octets, and /CIDR.
 *	"size" is in bytes and describes "dst".
 * return:
 *	number of bits, either imputed classfully or specified with /CIDR,
 *	or -1 if some failure occurred (check errno).  ENOENT means it was
 *	not a valid network specification.
 * author:
 *	Paul Vixie (ISC), June 1996
 */
int
inet_net_pton(int af, const char *src, void *dst, size_t size) {
	switch (af) {
	case AF_INET:
		return (inet_net_pton_ipv4(src, dst, size));
	case AF_INET6:
		return (inet_net_pton_ipv6(src, dst, size));
	default:
		errno = EAFNOSUPPORT;
		return (-1);
	}
}

/*
 * Weak aliases for applications that use certain private entry points,
 * and fail to include <arpa/inet.h>.
 */
#undef inet_net_pton
__weak_reference(__inet_net_pton, inet_net_pton);

/*! \file */
Commit	Line	Data
9385eb3d	1	/*
b5d655f7 A	2	* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
b5d655f7 A	3	* Copyright (c) 1996,1999 by Internet Software Consortium.
9385eb3d A	4	*
	5	* Permission to use, copy, modify, and distribute this software for any
	6	* purpose with or without fee is hereby granted, provided that the above
	7	* copyright notice and this permission notice appear in all copies.
	8	*
b5d655f7 A	9	* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
	10	* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
	11	* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
	12	* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
	13	* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
	14	* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
	15	* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
9385eb3d A	16	*/
	17
	18	#if defined(LIBC_SCCS) && !defined(lint)
1f2f436a	19	static const char rcsid[] = "$Id: inet_net_pton.c,v 1.7.18.2 2008/08/26 04:42:43 marka Exp $";
9385eb3d	20	#endif
ad3c9f2a A	21
	22	/* the algorithms only can deal with ASCII, so we optimize for it */
	23	#define USE_ASCII
	24
9385eb3d	25	#include <sys/cdefs.h>
1f2f436a	26	__FBSDID("$FreeBSD: src/lib/libc/inet/inet_net_pton.c,v 1.4 2008/12/14 19:39:53 ume Exp $");
b5d655f7 A	27
b5d655f7 A	28	#include "port_before.h"
9385eb3d A	29
	30	#include <sys/types.h>
	31	#include <sys/socket.h>
	32	#include <netinet/in.h>
b5d655f7	33	#include <arpa/nameser.h>
9385eb3d A	34	#include <arpa/inet.h>
	35
	36	#include <assert.h>
	37	#include <ctype.h>
	38	#include <errno.h>
	39	#include <stdio.h>
	40	#include <string.h>
	41	#include <stdlib.h>
	42
b5d655f7 A	43	#include "port_after.h"
b5d655f7 A	44
9385eb3d A	45	#ifdef SPRINTF_CHAR
	46	# define SPRINTF(x) strlen(sprintf/**/x)
	47	#else
	48	# define SPRINTF(x) ((size_t)sprintf x)
	49	#endif
	50
b5d655f7	51	/*%
9385eb3d A	52	* static int
	53	* inet_net_pton_ipv4(src, dst, size)
	54	* convert IPv4 network number from presentation to network format.
	55	* accepts hex octets, hex strings, decimal octets, and /CIDR.
	56	* "size" is in bytes and describes "dst".
	57	* return:
	58	* number of bits, either imputed classfully or specified with /CIDR,
	59	* or -1 if some failure occurred (check errno). ENOENT means it was
	60	* not an IPv4 network specification.
	61	* note:
	62	* network byte order assumed. this means 192.5.5.240/28 has
b5d655f7	63	* 0b11110000 in its fourth octet.
9385eb3d A	64	* author:
	65	* Paul Vixie (ISC), June 1996
	66	*/
	67	static int
b5d655f7 A	68	inet_net_pton_ipv4(const char src, u_char dst, size_t size) {
	69	static const char xdigits[] = "0123456789abcdef";
	70	static const char digits[] = "0123456789";
	71	int n, ch, tmp = 0, dirty, bits;
9385eb3d A	72	const u_char *odst = dst;
	73
	74	ch = *src++;
	75	if (ch == '0' && (src[0] == 'x' \|\| src[0] == 'X')
b5d655f7 A	76	&& isascii((unsigned char)(src[1]))
b5d655f7 A	77	&& isxdigit((unsigned char)(src[1]))) {
9385eb3d	78	/* Hexadecimal: Eat nybble string. */
b5d655f7	79	if (size <= 0U)
9385eb3d	80	goto emsgsize;
b5d655f7 A	81	dirty = 0;
	82	src++; /%< skip x or X. /
	83	while ((ch = *src++) != '\0' && isascii(ch) && isxdigit(ch)) {
9385eb3d A	84	if (isupper(ch))
	85	ch = tolower(ch);
	86	n = strchr(xdigits, ch) - xdigits;
	87	assert(n >= 0 && n <= 15);
b5d655f7 A	88	if (dirty == 0)
b5d655f7 A	89	tmp = n;
9385eb3d	90	else
b5d655f7 A	91	tmp = (tmp << 4) \| n;
	92	if (++dirty == 2) {
	93	if (size-- <= 0U)
	94	goto emsgsize;
	95	*dst++ = (u_char) tmp;
	96	dirty = 0;
	97	}
	98	}
	99	if (dirty) { /%< Odd trailing nybble? /
	100	if (size-- <= 0U)
9385eb3d	101	goto emsgsize;
b5d655f7	102	*dst++ = (u_char) (tmp << 4);
9385eb3d	103	}
9385eb3d A	104	} else if (isascii(ch) && isdigit(ch)) {
	105	/* Decimal: eat dotted digit string. */
	106	for (;;) {
	107	tmp = 0;
	108	do {
	109	n = strchr(digits, ch) - digits;
	110	assert(n >= 0 && n <= 9);
	111	tmp *= 10;
	112	tmp += n;
	113	if (tmp > 255)
	114	goto enoent;
	115	} while ((ch = *src++) != '\0' &&
	116	isascii(ch) && isdigit(ch));
b5d655f7	117	if (size-- <= 0U)
9385eb3d A	118	goto emsgsize;
	119	*dst++ = (u_char) tmp;
	120	if (ch == '\0' \|\| ch == '/')
	121	break;
	122	if (ch != '.')
	123	goto enoent;
	124	ch = *src++;
	125	if (!isascii(ch) \|\| !isdigit(ch))
	126	goto enoent;
	127	}
	128	} else
	129	goto enoent;
	130
	131	bits = -1;
b5d655f7 A	132	if (ch == '/' && isascii((unsigned char)(src[0])) &&
b5d655f7 A	133	isdigit((unsigned char)(src[0])) && dst > odst) {
9385eb3d	134	/* CIDR width specifier. Nothing can follow it. */
b5d655f7	135	ch = src++; /%< Skip over the /. */
9385eb3d A	136	bits = 0;
	137	do {
	138	n = strchr(digits, ch) - digits;
	139	assert(n >= 0 && n <= 9);
	140	bits *= 10;
	141	bits += n;
1f2f436a A	142	if (bits > 32)
1f2f436a A	143	goto enoent;
9385eb3d A	144	} while ((ch = *src++) != '\0' && isascii(ch) && isdigit(ch));
	145	if (ch != '\0')
	146	goto enoent;
9385eb3d A	147	}
	148
	149	/* Firey death and destruction unless we prefetched EOS. */
	150	if (ch != '\0')
	151	goto enoent;
	152
	153	/* If nothing was written to the destination, we found no address. */
	154	if (dst == odst)
	155	goto enoent;
	156	/* If no CIDR spec was given, infer width from net class. */
	157	if (bits == -1) {
b5d655f7	158	if (odst >= 240) /%< Class E */
9385eb3d	159	bits = 32;
b5d655f7 A	160	else if (odst >= 224) /%< Class D */
	161	bits = 8;
	162	else if (odst >= 192) /%< Class C */
9385eb3d	163	bits = 24;
b5d655f7	164	else if (odst >= 128) /%< Class B */
9385eb3d	165	bits = 16;
b5d655f7	166	else /%< Class A /
9385eb3d A	167	bits = 8;
9385eb3d A	168	/* If imputed mask is narrower than specified octets, widen. */
3d9156a7	169	if (bits < ((dst - odst) * 8))
9385eb3d	170	bits = (dst - odst) * 8;
b5d655f7 A	171	/*
	172	* If there are no additional bits specified for a class D
	173	* address adjust bits to 4.
	174	*/
	175	if (bits == 8 && *odst == 224)
	176	bits = 4;
9385eb3d A	177	}
	178	/* Extend network to cover the actual mask. */
	179	while (bits > ((dst - odst) * 8)) {
b5d655f7	180	if (size-- <= 0U)
9385eb3d A	181	goto emsgsize;
	182	*dst++ = '\0';
	183	}
	184	return (bits);
	185
	186	enoent:
	187	errno = ENOENT;
	188	return (-1);
	189
	190	emsgsize:
	191	errno = EMSGSIZE;
	192	return (-1);
	193	}
	194
b5d655f7 A	195	static int
	196	getbits(const char src, int bitsp) {
	197	static const char digits[] = "0123456789";
	198	int n;
	199	int val;
	200	char ch;
	201
	202	val = 0;
	203	n = 0;
	204	while ((ch = *src++) != '\0') {
	205	const char *pch;
	206
	207	pch = strchr(digits, ch);
	208	if (pch != NULL) {
	209	if (n++ != 0 && val == 0) /%< no leading zeros /
	210	return (0);
	211	val *= 10;
	212	val += (pch - digits);
	213	if (val > 128) /%< range /
	214	return (0);
	215	continue;
	216	}
	217	return (0);
	218	}
	219	if (n == 0)
	220	return (0);
	221	*bitsp = val;
	222	return (1);
	223	}
	224
	225	static int
	226	getv4(const char src, u_char dst, int *bitsp) {
	227	static const char digits[] = "0123456789";
	228	u_char *odst = dst;
	229	int n;
	230	u_int val;
	231	char ch;
	232
	233	val = 0;
	234	n = 0;
	235	while ((ch = *src++) != '\0') {
	236	const char *pch;
	237
	238	pch = strchr(digits, ch);
	239	if (pch != NULL) {
	240	if (n++ != 0 && val == 0) /%< no leading zeros /
	241	return (0);
	242	val *= 10;
	243	val += (pch - digits);
	244	if (val > 255) /%< range /
	245	return (0);
	246	continue;
	247	}
	248	if (ch == '.' \|\| ch == '/') {
	249	if (dst - odst > 3) /%< too many octets? /
	250	return (0);
	251	*dst++ = val;
	252	if (ch == '/')
	253	return (getbits(src, bitsp));
	254	val = 0;
	255	n = 0;
	256	continue;
	257	}
	258	return (0);
259	}
260	if (n == 0)
261	return (0);
262	if (dst - odst > 3) /%< too many octets? /
263	return (0);
264	*dst++ = val;
265	return (1);
266	}
267
268	static int
269	inet_net_pton_ipv6(const char src, u_char dst, size_t size) {
270	static const char xdigits_l[] = "0123456789abcdef",
271	xdigits_u[] = "0123456789ABCDEF";
272	u_char tmp[NS_IN6ADDRSZ], tp, endp, *colonp;
273	const char xdigits, curtok;
274	int ch, saw_xdigit;
275	u_int val;
276	int digits;
277	int bits;
278	size_t bytes;
279	int words;
280	int ipv4;
281
282	memset((tp = tmp), '\0', NS_IN6ADDRSZ);
283	endp = tp + NS_IN6ADDRSZ;
284	colonp = NULL;
285	/* Leading :: requires some special handling. */
286	if (*src == ':')
287	if (*++src != ':')
288	goto enoent;
289	curtok = src;
290	saw_xdigit = 0;
291	val = 0;
292	digits = 0;
293	bits = -1;
294	ipv4 = 0;
295	while ((ch = *src++) != '\0') {
296	const char *pch;
297
298	if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
299	pch = strchr((xdigits = xdigits_u), ch);
300	if (pch != NULL) {
301	val <<= 4;
302	val \|= (pch - xdigits);
303	if (++digits > 4)
304	goto enoent;
305	saw_xdigit = 1;
306	continue;
307	}
308	if (ch == ':') {
309	curtok = src;
310	if (!saw_xdigit) {
311	if (colonp)
312	goto enoent;
313	colonp = tp;
314	continue;
315	} else if (*src == '\0')
316	goto enoent;
317	if (tp + NS_INT16SZ > endp)
318	return (0);
319	*tp++ = (u_char) (val >> 8) & 0xff;
320	*tp++ = (u_char) val & 0xff;
321	saw_xdigit = 0;
322	digits = 0;
323	val = 0;
324	continue;
325	}
326	if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
327	getv4(curtok, tp, &bits) > 0) {
328	tp += NS_INADDRSZ;
329	saw_xdigit = 0;
330	ipv4 = 1;
331	break; /%< '\\0' was seen by inet_pton4(). /
332	}
333	if (ch == '/' && getbits(src, &bits) > 0)
334	break;
335	goto enoent;
336	}
337	if (saw_xdigit) {
338	if (tp + NS_INT16SZ > endp)
339	goto enoent;
340	*tp++ = (u_char) (val >> 8) & 0xff;
341	*tp++ = (u_char) val & 0xff;
342	}
343	if (bits == -1)
344	bits = 128;
345
346	words = (bits + 15) / 16;
347	if (words < 2)
348	words = 2;
349	if (ipv4)
350	words = 8;
351	endp = tmp + 2 * words;
352
353	if (colonp != NULL) {
354	/*
355	* Since some memmove()'s erroneously fail to handle
356	* overlapping regions, we'll do the shift by hand.
357	*/
358	const int n = tp - colonp;
359	int i;
360
361	if (tp == endp)
362	goto enoent;
363	for (i = 1; i <= n; i++) {
364	endp[- i] = colonp[n - i];
365	colonp[n - i] = 0;
366	}
367	tp = endp;
368	}
369	if (tp != endp)
370	goto enoent;
371
372	bytes = (bits + 7) / 8;
373	if (bytes > size)
374	goto emsgsize;
375	memcpy(dst, tmp, bytes);
376	return (bits);
377
378	enoent:
379	errno = ENOENT;
380	return (-1);
381
382	emsgsize:
383	errno = EMSGSIZE;
384	return (-1);
385	}
386
387	/*%
388	* int
389	* inet_net_pton(af, src, dst, size)
390	* convert network number from presentation to network format.
391	* accepts hex octets, hex strings, decimal octets, and /CIDR.
392	* "size" is in bytes and describes "dst".
393	* return:
394	* number of bits, either imputed classfully or specified with /CIDR,
395	* or -1 if some failure occurred (check errno). ENOENT means it was
396	* not a valid network specification.
397	* author:
398	* Paul Vixie (ISC), June 1996
399	*/
400	int
401	inet_net_pton(int af, const char src, void dst, size_t size) {
402	switch (af) {
403	case AF_INET:
404	return (inet_net_pton_ipv4(src, dst, size));
405	case AF_INET6:
406	return (inet_net_pton_ipv6(src, dst, size));
407	default:
408	errno = EAFNOSUPPORT;
409	return (-1);
410	}
411	}
412
9385eb3d A	413	/*
	414	* Weak aliases for applications that use certain private entry points,
	415	* and fail to include <arpa/inet.h>.
	416	*/
	417	#undef inet_net_pton
	418	__weak_reference(__inet_net_pton, inet_net_pton);
b5d655f7 A	419
b5d655f7 A	420	/! \file /