1 | /* |
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2 | * Copyright (c) 1996 by Internet Software Consortium. |
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3 | * |
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4 | * Permission to use, copy, modify, and distribute this software for any |
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5 | * purpose with or without fee is hereby granted, provided that the above |
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6 | * copyright notice and this permission notice appear in all copies. |
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7 | * |
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8 | * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS |
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9 | * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES |
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10 | * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE |
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11 | * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL |
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12 | * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
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13 | * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS |
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14 | * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS |
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15 | * SOFTWARE. |
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16 | */ |
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17 | |
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18 | #if defined(LIBC_SCCS) && !defined(lint) |
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19 | static const char orig_rcsid[] = "From Id: inet_neta.c,v 8.2 1996/08/08 06:54:44 vixie Exp"; |
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20 | static const char rcsid[] = "$Id$"; |
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21 | #endif |
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22 | |
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23 | #include <sys/types.h> |
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24 | #include <sys/socket.h> |
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25 | #include <netinet/in.h> |
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26 | #include <arpa/inet.h> |
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27 | |
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28 | #include <errno.h> |
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29 | #include <stdio.h> |
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30 | #include <string.h> |
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31 | |
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32 | #ifdef SPRINTF_CHAR |
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33 | # define SPRINTF(x) strlen(sprintf/**/x) |
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34 | #else |
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35 | # define SPRINTF(x) ((size_t)sprintf x) |
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36 | #endif |
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37 | |
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38 | /* |
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39 | * char * |
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40 | * inet_neta(src, dst, size) |
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41 | * format a u_long network number into presentation format. |
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42 | * return: |
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43 | * pointer to dst, or NULL if an error occurred (check errno). |
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44 | * note: |
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45 | * format of ``src'' is as for inet_network(). |
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46 | * author: |
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47 | * Paul Vixie (ISC), July 1996 |
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48 | */ |
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49 | char * |
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50 | inet_neta(src, dst, size) |
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51 | u_long src; |
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52 | char *dst; |
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53 | size_t size; |
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54 | { |
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55 | char *odst = dst; |
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56 | char *tp; |
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57 | |
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58 | while (src & 0xffffffff) { |
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59 | u_char b = (src & 0xff000000) >> 24; |
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60 | |
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61 | src <<= 8; |
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62 | if (b) { |
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63 | if (size < sizeof "255.") |
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64 | goto emsgsize; |
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65 | tp = dst; |
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66 | dst += SPRINTF((dst, "%u", b)); |
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67 | if (src != 0L) { |
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68 | *dst++ = '.'; |
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69 | *dst = '\0'; |
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70 | } |
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71 | size -= (size_t)(dst - tp); |
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72 | } |
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73 | } |
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74 | if (dst == odst) { |
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75 | if (size < sizeof "0.0.0.0") |
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76 | goto emsgsize; |
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77 | strcpy(dst, "0.0.0.0"); |
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78 | } |
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79 | return (odst); |
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80 | |
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81 | emsgsize: |
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82 | errno = EMSGSIZE; |
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83 | return (NULL); |
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84 | } |
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