Mercurial > hg > octave-shane > gnulib-hg
annotate lib/inet_ntop.c @ 6259:96c32553b4c6
Use a consistent style for including <config.h>.
* __fpending.c, acl.c, argmatch.c,
argp-help.c, argp-parse.c,
argp-pvh.c, backupfile.c, basename.c, c-stack.c,
calloc.c, check-version.c, cloexec.c, closeout.c, copy-file.c,
creat-safer.c, cycle-check.c, dirfd.c, dirname.c, dup-safer.c,
dup2.c, euidaccess.c, exclude.c, exitfail.c, fatal-signal.c,
fd-safer.c, file-type.c, fileblocks.c, filemode.c,
filenamecat.c, findprog.c, fnmatch.c, fopen-safer.c, free.c,
fsusage.c, ftruncate.c, full-write.c, fwriteerror.c,
getaddrinfo.c, getcwd.c, getdelim.c, getline.c, getlogin_r.c,
getndelim2.c, getnline.c, getopt1.c, getpass.c, group-member.c,
hard-locale.c, hash-pjw.c, hash.c, human.c, idcache.c,
inet_ntop.c, isdir.c, long-options.c, malloc.c, memcasecmp.c,
memcmp.c, memcoll.c, memcpy.c, memmove.c, mkdir-p.c,
modechange.c, mountlist.c, open-safer.c, physmem.c,
pipe-safer.c, pipe.c, poll.c, posixver.c, progname.c,
progreloc.c, putenv.c, quote.c, quotearg.c, readline.c,
readlink.c, realloc.c, regex.c, rename.c, rmdir.c, rpmatch.c,
safe-read.c, same.c, save-cwd.c, savedir.c, sig2str.c,
strcspn.c, strerror.c, stripslash.c, strncasecmp.c, strndup.c,
strnlen.c, strnlen1.c, strsep.c, strstr.c, strtod.c,
strtoimax.c, strtol.c, strverscmp.c, tempname.c, time_r.c,
userspec.c, utimecmp.c, version-etc-fsf.c,
version-etc.c, wait-process.c, xalloc-die.c, xgetcwd.c,
xmalloc.c, xmemcoll.c, xnanosleep.c, xreadlink.c, xsetenv.c,
xstrndup.c, xstrtoimax.c, xstrtol.c, xstrtoumax.c, yesno.c:
Standardize inclusion of config.h.
* __fpending.h, dirfd.h, getdate.h, human.h,
inttostr.h: Removed inclusion of config.h from header files.
* inttostr.c: Adjusted in-tree users.
* timespec.h: Remove superfluous warning to include config.h.
* atexit.c, chdir-long.c chown.c, fchown-stub.c, getgroups.c,
gettimeofday.c, lchown.c, lstat.c, mkdir.c, mkstemp.c,
nanosleep.c, openat.c, raise.c, readtokens0.c, readutmp.c,
unlinkdir.c: Guard inclusion of config.h with HAVE_CONFIG_H.
| author | Paul Eggert <eggert@cs.ucla.edu> |
|---|---|
| date | Mon, 19 Sep 2005 17:28:14 +0000 |
| parents | 96441be32be1 |
| children | be00741570b7 |
| rev | line source |
|---|---|
| 5825 | 1 /* |
| 2 * Copyright (c) 1996-1999 by Internet Software Consortium. | |
| 3 * Copyright (c) 2005 Free Software Foundation, Inc. | |
| 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 | |
|
6259
96c32553b4c6
Use a consistent style for including <config.h>.
Paul Eggert <eggert@cs.ucla.edu>
parents:
5825
diff
changeset
|
19 #ifdef HAVE_CONFIG_H |
| 5825 | 20 # include <config.h> |
| 21 #endif | |
| 22 | |
| 23 /* Specification. */ | |
| 24 #include "inet_ntop.h" | |
| 25 | |
| 26 #include <stdio.h> | |
| 27 #include <string.h> | |
| 28 #include <errno.h> | |
| 29 | |
| 30 #define NS_IN6ADDRSZ 16 | |
| 31 #define NS_INT16SZ 2 | |
| 32 | |
| 33 /* | |
| 34 * WARNING: Don't even consider trying to compile this on a system where | |
| 35 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX. | |
| 36 */ | |
| 37 typedef int verify_int_size[2 * sizeof(int) - 7]; | |
| 38 | |
| 39 #if HAVE_IPV4 | |
| 40 static const char *inet_ntop4 (const unsigned char *src, char *dst, socklen_t size); | |
| 41 #endif | |
| 42 #if HAVE_IPV6 | |
| 43 static const char *inet_ntop6 (const unsigned char *src, char *dst, socklen_t size); | |
| 44 #endif | |
| 45 | |
| 46 | |
| 47 /* char * | |
| 48 * inet_ntop(af, src, dst, size) | |
| 49 * convert a network format address to presentation format. | |
| 50 * return: | |
| 51 * pointer to presentation format address (`dst'), or NULL (see errno). | |
| 52 * author: | |
| 53 * Paul Vixie, 1996. | |
| 54 */ | |
| 55 const char * | |
| 56 inet_ntop(af, src, dst, size) | |
| 57 int af; | |
| 58 const void *src; | |
| 59 char *dst; | |
| 60 socklen_t size; | |
| 61 { | |
| 62 switch (af) { | |
| 63 | |
| 64 #if HAVE_IPV4 | |
| 65 case AF_INET: | |
| 66 return (inet_ntop4(src, dst, size)); | |
| 67 #endif | |
| 68 | |
| 69 #if HAVE_IPV6 | |
| 70 case AF_INET6: | |
| 71 return (inet_ntop6(src, dst, size)); | |
| 72 #endif | |
| 73 default: | |
| 74 errno = EAFNOSUPPORT; | |
| 75 return (NULL); | |
| 76 } | |
| 77 /* NOTREACHED */ | |
| 78 } | |
| 79 | |
| 80 #if HAVE_IPV4 | |
| 81 | |
| 82 /* const char * | |
| 83 * inet_ntop4(src, dst, size) | |
| 84 * format an IPv4 address | |
| 85 * return: | |
| 86 * `dst' (as a const) | |
| 87 * notes: | |
| 88 * (1) uses no statics | |
| 89 * (2) takes a u_char* not an in_addr as input | |
| 90 * author: | |
| 91 * Paul Vixie, 1996. | |
| 92 */ | |
| 93 static const char * | |
| 94 inet_ntop4(src, dst, size) | |
| 95 const unsigned char *src; | |
| 96 char *dst; | |
| 97 socklen_t size; | |
| 98 { | |
| 99 static const char fmt[] = "%u.%u.%u.%u"; | |
| 100 char tmp[sizeof "255.255.255.255"]; | |
| 101 | |
| 102 if (sprintf(tmp, fmt, src[0], src[1], src[2], src[3]) > size) { | |
| 103 errno = ENOSPC; | |
| 104 return (NULL); | |
| 105 } | |
| 106 return strcpy(dst, tmp); | |
| 107 } | |
| 108 | |
| 109 #endif | |
| 110 | |
| 111 #if HAVE_IPV6 | |
| 112 | |
| 113 /* const char * | |
| 114 * inet_ntop6(src, dst, size) | |
| 115 * convert IPv6 binary address into presentation (printable) format | |
| 116 * author: | |
| 117 * Paul Vixie, 1996. | |
| 118 */ | |
| 119 static const char * | |
| 120 inet_ntop6(src, dst, size) | |
| 121 const unsigned char *src; | |
| 122 char *dst; | |
| 123 socklen_t size; | |
| 124 { | |
| 125 /* | |
| 126 * Note that int32_t and int16_t need only be "at least" large enough | |
| 127 * to contain a value of the specified size. On some systems, like | |
| 128 * Crays, there is no such thing as an integer variable with 16 bits. | |
| 129 * Keep this in mind if you think this function should have been coded | |
| 130 * to use pointer overlays. All the world's not a VAX. | |
| 131 */ | |
| 132 char tmp[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"], *tp; | |
| 133 struct { int base, len; } best, cur; | |
| 134 unsigned int words[NS_IN6ADDRSZ / NS_INT16SZ]; | |
| 135 int i; | |
| 136 | |
| 137 /* | |
| 138 * Preprocess: | |
| 139 * Copy the input (bytewise) array into a wordwise array. | |
| 140 * Find the longest run of 0x00's in src[] for :: shorthanding. | |
| 141 */ | |
| 142 memset(words, '\0', sizeof words); | |
| 143 for (i = 0; i < NS_IN6ADDRSZ; i += 2) | |
| 144 words[i / 2] = (src[i] << 8) | src[i + 1]; | |
| 145 best.base = -1; | |
| 146 cur.base = -1; | |
| 147 for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++) { | |
| 148 if (words[i] == 0) { | |
| 149 if (cur.base == -1) | |
| 150 cur.base = i, cur.len = 1; | |
| 151 else | |
| 152 cur.len++; | |
| 153 } else { | |
| 154 if (cur.base != -1) { | |
| 155 if (best.base == -1 || cur.len > best.len) | |
| 156 best = cur; | |
| 157 cur.base = -1; | |
| 158 } | |
| 159 } | |
| 160 } | |
| 161 if (cur.base != -1) { | |
| 162 if (best.base == -1 || cur.len > best.len) | |
| 163 best = cur; | |
| 164 } | |
| 165 if (best.base != -1 && best.len < 2) | |
| 166 best.base = -1; | |
| 167 | |
| 168 /* | |
| 169 * Format the result. | |
| 170 */ | |
| 171 tp = tmp; | |
| 172 for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++) { | |
| 173 /* Are we inside the best run of 0x00's? */ | |
| 174 if (best.base != -1 && i >= best.base && | |
| 175 i < (best.base + best.len)) { | |
| 176 if (i == best.base) | |
| 177 *tp++ = ':'; | |
| 178 continue; | |
| 179 } | |
| 180 /* Are we following an initial run of 0x00s or any real hex? */ | |
| 181 if (i != 0) | |
| 182 *tp++ = ':'; | |
| 183 /* Is this address an encapsulated IPv4? */ | |
| 184 if (i == 6 && best.base == 0 && | |
| 185 (best.len == 6 || (best.len == 5 && words[5] == 0xffff))) { | |
| 186 if (!inet_ntop4(src+12, tp, sizeof tmp - (tp - tmp))) | |
| 187 return (NULL); | |
| 188 tp += strlen(tp); | |
| 189 break; | |
| 190 } | |
| 191 tp += sprintf(tp, "%x", words[i]); | |
| 192 } | |
| 193 /* Was it a trailing run of 0x00's? */ | |
| 194 if (best.base != -1 && (best.base + best.len) == | |
| 195 (NS_IN6ADDRSZ / NS_INT16SZ)) | |
| 196 *tp++ = ':'; | |
| 197 *tp++ = '\0'; | |
| 198 | |
| 199 /* | |
| 200 * Check for overflow, copy, and we're done. | |
| 201 */ | |
| 202 if ((socklen_t)(tp - tmp) > size) { | |
| 203 errno = ENOSPC; | |
| 204 return (NULL); | |
| 205 } | |
| 206 return strcpy(dst, tmp); | |
| 207 } | |
| 208 | |
| 209 #endif |