Remove ENABLE_SSSE3_ON_ATOM.
[glibc/pb-stable.git] / resolv / inet_pton.c
blobc507013e4ea9a90b18c69799ec95d4924e85f832
1 /*
2 * Copyright (c) 1996,1999 by Internet Software Consortium.
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.
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.
18 #if defined(LIBC_SCCS) && !defined(lint)
19 static const char rcsid[] = "$BINDId: inet_pton.c,v 1.7 1999/10/13 16:39:28 vixie Exp $";
20 #endif /* LIBC_SCCS and not lint */
22 #include <sys/param.h>
23 #include <sys/types.h>
24 #include <sys/socket.h>
25 #include <netinet/in.h>
26 #include <arpa/inet.h>
27 #include <arpa/nameser.h>
28 #include <ctype.h>
29 #include <string.h>
30 #include <errno.h>
33 * WARNING: Don't even consider trying to compile this on a system where
34 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
37 static int inet_pton4 (const char *src, u_char *dst) internal_function;
38 static int inet_pton6 (const char *src, u_char *dst) internal_function;
40 /* int
41 * inet_pton(af, src, dst)
42 * convert from presentation format (which usually means ASCII printable)
43 * to network format (which is usually some kind of binary format).
44 * return:
45 * 1 if the address was valid for the specified address family
46 * 0 if the address wasn't valid (`dst' is untouched in this case)
47 * -1 if some other error occurred (`dst' is untouched in this case, too)
48 * author:
49 * Paul Vixie, 1996.
51 int
52 inet_pton(af, src, dst)
53 int af;
54 const char *src;
55 void *dst;
57 switch (af) {
58 case AF_INET:
59 return (inet_pton4(src, dst));
60 case AF_INET6:
61 return (inet_pton6(src, dst));
62 default:
63 __set_errno (EAFNOSUPPORT);
64 return (-1);
66 /* NOTREACHED */
68 libc_hidden_def (inet_pton)
70 /* int
71 * inet_pton4(src, dst)
72 * like inet_aton() but without all the hexadecimal, octal (with the
73 * exception of 0) and shorthand.
74 * return:
75 * 1 if `src' is a valid dotted quad, else 0.
76 * notice:
77 * does not touch `dst' unless it's returning 1.
78 * author:
79 * Paul Vixie, 1996.
81 static int
82 internal_function
83 inet_pton4(src, dst)
84 const char *src;
85 u_char *dst;
87 int saw_digit, octets, ch;
88 u_char tmp[NS_INADDRSZ], *tp;
90 saw_digit = 0;
91 octets = 0;
92 *(tp = tmp) = 0;
93 while ((ch = *src++) != '\0') {
95 if (ch >= '0' && ch <= '9') {
96 u_int new = *tp * 10 + (ch - '0');
98 if (saw_digit && *tp == 0)
99 return (0);
100 if (new > 255)
101 return (0);
102 *tp = new;
103 if (! saw_digit) {
104 if (++octets > 4)
105 return (0);
106 saw_digit = 1;
108 } else if (ch == '.' && saw_digit) {
109 if (octets == 4)
110 return (0);
111 *++tp = 0;
112 saw_digit = 0;
113 } else
114 return (0);
116 if (octets < 4)
117 return (0);
118 memcpy(dst, tmp, NS_INADDRSZ);
119 return (1);
122 /* int
123 * inet_pton6(src, dst)
124 * convert presentation level address to network order binary form.
125 * return:
126 * 1 if `src' is a valid [RFC1884 2.2] address, else 0.
127 * notice:
128 * (1) does not touch `dst' unless it's returning 1.
129 * (2) :: in a full address is silently ignored.
130 * credit:
131 * inspired by Mark Andrews.
132 * author:
133 * Paul Vixie, 1996.
135 static int
136 internal_function
137 inet_pton6(src, dst)
138 const char *src;
139 u_char *dst;
141 static const char xdigits[] = "0123456789abcdef";
142 u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
143 const char *curtok;
144 int ch, saw_xdigit;
145 u_int val;
147 tp = memset(tmp, '\0', NS_IN6ADDRSZ);
148 endp = tp + NS_IN6ADDRSZ;
149 colonp = NULL;
150 /* Leading :: requires some special handling. */
151 if (*src == ':')
152 if (*++src != ':')
153 return (0);
154 curtok = src;
155 saw_xdigit = 0;
156 val = 0;
157 while ((ch = tolower (*src++)) != '\0') {
158 const char *pch;
160 pch = strchr(xdigits, ch);
161 if (pch != NULL) {
162 val <<= 4;
163 val |= (pch - xdigits);
164 if (val > 0xffff)
165 return (0);
166 saw_xdigit = 1;
167 continue;
169 if (ch == ':') {
170 curtok = src;
171 if (!saw_xdigit) {
172 if (colonp)
173 return (0);
174 colonp = tp;
175 continue;
176 } else if (*src == '\0') {
177 return (0);
179 if (tp + NS_INT16SZ > endp)
180 return (0);
181 *tp++ = (u_char) (val >> 8) & 0xff;
182 *tp++ = (u_char) val & 0xff;
183 saw_xdigit = 0;
184 val = 0;
185 continue;
187 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
188 inet_pton4(curtok, tp) > 0) {
189 tp += NS_INADDRSZ;
190 saw_xdigit = 0;
191 break; /* '\0' was seen by inet_pton4(). */
193 return (0);
195 if (saw_xdigit) {
196 if (tp + NS_INT16SZ > endp)
197 return (0);
198 *tp++ = (u_char) (val >> 8) & 0xff;
199 *tp++ = (u_char) val & 0xff;
201 if (colonp != NULL) {
203 * Since some memmove()'s erroneously fail to handle
204 * overlapping regions, we'll do the shift by hand.
206 const int n = tp - colonp;
207 int i;
209 if (tp == endp)
210 return (0);
211 for (i = 1; i <= n; i++) {
212 endp[- i] = colonp[n - i];
213 colonp[n - i] = 0;
215 tp = endp;
217 if (tp != endp)
218 return (0);
219 memcpy(dst, tmp, NS_IN6ADDRSZ);
220 return (1);