1 | #include <machine/rtems-bsd-user-space.h> |
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2 | |
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3 | /*- |
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4 | * Copyright (c) 2001 Brian Somers <brian@Awfulhak.org> |
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5 | * Based on original work by Atsushi Murai <amurai@FreeBSD.org> |
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6 | * All rights reserved. |
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7 | * |
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8 | * Redistribution and use in source and binary forms, with or without |
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9 | * modification, are permitted provided that the following conditions |
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10 | * are met: |
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11 | * 1. Redistributions of source code must retain the above copyright |
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12 | * notice, this list of conditions and the following disclaimer. |
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13 | * 2. Redistributions in binary form must reproduce the above copyright |
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14 | * notice, this list of conditions and the following disclaimer in the |
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15 | * documentation and/or other materials provided with the distribution. |
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16 | * |
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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27 | * SUCH DAMAGE. |
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28 | * |
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29 | */ |
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30 | |
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31 | #include <sys/cdefs.h> |
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32 | __FBSDID("$FreeBSD$"); |
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33 | |
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34 | #include <rtems/bsd/sys/param.h> |
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35 | |
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36 | #include <libutil.h> |
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37 | #include <string.h> |
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38 | #include <unistd.h> |
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39 | |
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40 | static int isDISP(const char *); |
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41 | |
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42 | /*- |
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43 | * Trim the current domain name from fullhost, but only if the result |
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44 | * is less than or equal to hostsize in length. |
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45 | * |
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46 | * This function understands $DISPLAY type fullhosts. |
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47 | * |
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48 | * For example: |
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49 | * |
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50 | * trimdomain("abcde.my.domain", 5) -> "abcde" |
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51 | * trimdomain("abcde.my.domain", 4) -> "abcde.my.domain" |
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52 | * trimdomain("abcde.my.domain:0.0", 9) -> "abcde:0.0" |
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53 | * trimdomain("abcde.my.domain:0.0", 8) -> "abcde.my.domain:0.0" |
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54 | */ |
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55 | void |
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56 | trimdomain(char *fullhost, int hostsize) |
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57 | { |
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58 | static size_t dlen; |
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59 | static int first = 1; |
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60 | static char domain[MAXHOSTNAMELEN]; |
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61 | char *end, *s; |
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62 | size_t len; |
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63 | |
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64 | if (first) { |
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65 | /* XXX: Should we assume that our domain is this persistent ? */ |
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66 | first = 0; |
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67 | if (gethostname(domain, sizeof(domain) - 1) == 0 && |
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68 | (s = strchr(domain, '.')) != NULL) |
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69 | memmove(domain, s + 1, strlen(s + 1) + 1); |
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70 | else |
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71 | domain[0] = '\0'; |
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72 | dlen = strlen(domain); |
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73 | } |
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74 | |
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75 | if (domain[0] == '\0') |
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76 | return; |
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77 | |
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78 | s = fullhost; |
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79 | end = s + hostsize + 1; |
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80 | if ((s = memchr(s, '.', (size_t)(end - s))) != NULL) { |
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81 | if (strncasecmp(s + 1, domain, dlen) == 0) { |
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82 | if (s[dlen + 1] == '\0') { |
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83 | /* Found -- lose the domain. */ |
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84 | *s = '\0'; |
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85 | } else if (s[dlen + 1] == ':' && |
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86 | isDISP(s + dlen + 2) && |
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87 | (len = strlen(s + dlen + 1)) < (size_t)(end - s)) { |
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88 | /* Found -- shuffle the DISPLAY back. */ |
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89 | memmove(s, s + dlen + 1, len + 1); |
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90 | } |
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91 | } |
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92 | } |
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93 | } |
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94 | |
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95 | /* |
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96 | * Is the given string NN or NN.NN where ``NN'' is an all-numeric string ? |
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97 | */ |
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98 | static int |
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99 | isDISP(const char *disp) |
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100 | { |
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101 | size_t w; |
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102 | int res; |
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103 | |
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104 | w = strspn(disp, "0123456789"); |
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105 | res = 0; |
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106 | if (w > 0) { |
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107 | if (disp[w] == '\0') |
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108 | res = 1; /* NN */ |
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109 | else if (disp[w] == '.') { |
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110 | disp += w + 1; |
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111 | w = strspn(disp, "0123456789"); |
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112 | if (w > 0 && disp[w] == '\0') |
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113 | res = 1; /* NN.NN */ |
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114 | } |
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115 | } |
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116 | return (res); |
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117 | } |
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