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comparison mupdf-source/thirdparty/curl/lib/inet_pton.c @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1:1d09e1dec1d9 2:b50eed0cc0ef
1 /* This is from the BIND 4.9.4 release, modified to compile by itself */
2
3 /* Copyright (c) 1996 by Internet Software Consortium.
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 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
10 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
11 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
12 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
13 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
14 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
15 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
16 * SOFTWARE.
17 */
18
19 #include "curl_setup.h"
20
21 #ifndef HAVE_INET_PTON
22
23 #ifdef HAVE_SYS_PARAM_H
24 #include <sys/param.h>
25 #endif
26 #ifdef HAVE_NETINET_IN_H
27 #include <netinet/in.h>
28 #endif
29 #ifdef HAVE_ARPA_INET_H
30 #include <arpa/inet.h>
31 #endif
32
33 #include "inet_pton.h"
34
35 #define IN6ADDRSZ 16
36 #define INADDRSZ 4
37 #define INT16SZ 2
38
39 /*
40 * WARNING: Don't even consider trying to compile this on a system where
41 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
42 */
43
44 static int inet_pton4(const char *src, unsigned char *dst);
45 #ifdef ENABLE_IPV6
46 static int inet_pton6(const char *src, unsigned char *dst);
47 #endif
48
49 /* int
50 * inet_pton(af, src, dst)
51 * convert from presentation format (which usually means ASCII printable)
52 * to network format (which is usually some kind of binary format).
53 * return:
54 * 1 if the address was valid for the specified address family
55 * 0 if the address wasn't valid (`dst' is untouched in this case)
56 * -1 if some other error occurred (`dst' is untouched in this case, too)
57 * notice:
58 * On Windows we store the error in the thread errno, not
59 * in the winsock error code. This is to avoid losing the
60 * actual last winsock error. So when this function returns
61 * -1, check errno not SOCKERRNO.
62 * author:
63 * Paul Vixie, 1996.
64 */
65 int
66 Curl_inet_pton(int af, const char *src, void *dst)
67 {
68 switch(af) {
69 case AF_INET:
70 return (inet_pton4(src, (unsigned char *)dst));
71 #ifdef ENABLE_IPV6
72 case AF_INET6:
73 return (inet_pton6(src, (unsigned char *)dst));
74 #endif
75 default:
76 errno = EAFNOSUPPORT;
77 return (-1);
78 }
79 /* NOTREACHED */
80 }
81
82 /* int
83 * inet_pton4(src, dst)
84 * like inet_aton() but without all the hexadecimal and shorthand.
85 * return:
86 * 1 if `src' is a valid dotted quad, else 0.
87 * notice:
88 * does not touch `dst' unless it's returning 1.
89 * author:
90 * Paul Vixie, 1996.
91 */
92 static int
93 inet_pton4(const char *src, unsigned char *dst)
94 {
95 static const char digits[] = "0123456789";
96 int saw_digit, octets, ch;
97 unsigned char tmp[INADDRSZ], *tp;
98
99 saw_digit = 0;
100 octets = 0;
101 tp = tmp;
102 *tp = 0;
103 while((ch = *src++) != '\0') {
104 const char *pch;
105
106 pch = strchr(digits, ch);
107 if(pch) {
108 unsigned int val = *tp * 10 + (unsigned int)(pch - digits);
109
110 if(saw_digit && *tp == 0)
111 return (0);
112 if(val > 255)
113 return (0);
114 *tp = (unsigned char)val;
115 if(! saw_digit) {
116 if(++octets > 4)
117 return (0);
118 saw_digit = 1;
119 }
120 }
121 else if(ch == '.' && saw_digit) {
122 if(octets == 4)
123 return (0);
124 *++tp = 0;
125 saw_digit = 0;
126 }
127 else
128 return (0);
129 }
130 if(octets < 4)
131 return (0);
132 memcpy(dst, tmp, INADDRSZ);
133 return (1);
134 }
135
136 #ifdef ENABLE_IPV6
137 /* int
138 * inet_pton6(src, dst)
139 * convert presentation level address to network order binary form.
140 * return:
141 * 1 if `src' is a valid [RFC1884 2.2] address, else 0.
142 * notice:
143 * (1) does not touch `dst' unless it's returning 1.
144 * (2) :: in a full address is silently ignored.
145 * credit:
146 * inspired by Mark Andrews.
147 * author:
148 * Paul Vixie, 1996.
149 */
150 static int
151 inet_pton6(const char *src, unsigned char *dst)
152 {
153 static const char xdigits_l[] = "0123456789abcdef",
154 xdigits_u[] = "0123456789ABCDEF";
155 unsigned char tmp[IN6ADDRSZ], *tp, *endp, *colonp;
156 const char *curtok;
157 int ch, saw_xdigit;
158 size_t val;
159
160 memset((tp = tmp), 0, IN6ADDRSZ);
161 endp = tp + IN6ADDRSZ;
162 colonp = NULL;
163 /* Leading :: requires some special handling. */
164 if(*src == ':')
165 if(*++src != ':')
166 return (0);
167 curtok = src;
168 saw_xdigit = 0;
169 val = 0;
170 while((ch = *src++) != '\0') {
171 const char *xdigits;
172 const char *pch;
173
174 pch = strchr((xdigits = xdigits_l), ch);
175 if(!pch)
176 pch = strchr((xdigits = xdigits_u), ch);
177 if(pch != NULL) {
178 val <<= 4;
179 val |= (pch - xdigits);
180 if(++saw_xdigit > 4)
181 return (0);
182 continue;
183 }
184 if(ch == ':') {
185 curtok = src;
186 if(!saw_xdigit) {
187 if(colonp)
188 return (0);
189 colonp = tp;
190 continue;
191 }
192 if(tp + INT16SZ > endp)
193 return (0);
194 *tp++ = (unsigned char) ((val >> 8) & 0xff);
195 *tp++ = (unsigned char) (val & 0xff);
196 saw_xdigit = 0;
197 val = 0;
198 continue;
199 }
200 if(ch == '.' && ((tp + INADDRSZ) <= endp) &&
201 inet_pton4(curtok, tp) > 0) {
202 tp += INADDRSZ;
203 saw_xdigit = 0;
204 break; /* '\0' was seen by inet_pton4(). */
205 }
206 return (0);
207 }
208 if(saw_xdigit) {
209 if(tp + INT16SZ > endp)
210 return (0);
211 *tp++ = (unsigned char) ((val >> 8) & 0xff);
212 *tp++ = (unsigned char) (val & 0xff);
213 }
214 if(colonp != NULL) {
215 /*
216 * Since some memmove()'s erroneously fail to handle
217 * overlapping regions, we'll do the shift by hand.
218 */
219 const ssize_t n = tp - colonp;
220 ssize_t i;
221
222 if(tp == endp)
223 return (0);
224 for(i = 1; i <= n; i++) {
225 *(endp - i) = *(colonp + n - i);
226 *(colonp + n - i) = 0;
227 }
228 tp = endp;
229 }
230 if(tp != endp)
231 return (0);
232 memcpy(dst, tmp, IN6ADDRSZ);
233 return (1);
234 }
235 #endif /* ENABLE_IPV6 */
236
237 #endif /* HAVE_INET_PTON */