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annotate lib/getugroups.c @ 12421:e8d2c6fc33ad

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Use spaces for indentation, not tabs.
author Bruno Haible <bruno@clisp.org>
date Thu, 10 Dec 2009 20:28:30 +0100
parents 39be377f1765
children 11bc92a9e2bc
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /* getugroups.c -- return a list of the groups a user is in
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2
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3 Copyright (C) 1990, 1991, 1998-2000, 2003-2009 Free Software Foundation.
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4
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5 This program is free software: you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
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7 the Free Software Foundation; either version 3 of the License, or
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8 (at your option) any later version.
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU General Public License for more details.
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14
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15 You should have received a copy of the GNU General Public License
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16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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17
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18 /* Written by David MacKenzie. */
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19
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20 #include <config.h>
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21
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22 #include "getugroups.h"
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23
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24 #include <errno.h>
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25 #include <limits.h>
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26 #include <stdio.h> /* grp.h on alpha OSF1 V2.0 uses "FILE *". */
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27 #include <string.h>
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28 #include <unistd.h>
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29
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30 #if !HAVE_GRP_H
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31
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32 /* Mingw lacks all things related to group management. The best we
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33 can do is fail with ENOSYS. */
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34
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35 int
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36 getugroups (int maxcount _UNUSED_PARAMETER_,
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37 gid_t *grouplist _UNUSED_PARAMETER_,
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38 char const *username _UNUSED_PARAMETER_,
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39 gid_t gid _UNUSED_PARAMETER_)
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40 {
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41 errno = ENOSYS;
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42 return -1;
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43 }
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44
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45 #else /* HAVE_GRP_H */
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46 # include <grp.h>
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47
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48 # define STREQ(s1, s2) (strcmp (s1, s2) == 0)
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49
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50 /* Like `getgroups', but for user USERNAME instead of for the current
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51 process. Store at most MAXCOUNT group IDs in the GROUPLIST array.
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52 If GID is not -1, store it first (if possible). GID should be the
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53 group ID (pw_gid) obtained from getpwuid, in case USERNAME is not
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54 listed in /etc/groups. Upon failure, set errno and return -1.
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55 Otherwise, return the number of IDs we've written into GROUPLIST. */
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57 int
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58 getugroups (int maxcount, gid_t *grouplist, char const *username,
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59 gid_t gid)
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60 {
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61 int count = 0;
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62
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63 if (gid != (gid_t) -1)
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64 {
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65 if (maxcount != 0)
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66 grouplist[count] = gid;
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67 ++count;
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68 }
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69
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70 setgrent ();
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71 while (1)
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72 {
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73 char **cp;
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74 struct group *grp;
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75
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76 errno = 0;
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77 grp = getgrent ();
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78 if (grp == NULL)
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79 break;
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80
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81 for (cp = grp->gr_mem; *cp; ++cp)
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82 {
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83 int n;
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84
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85 if ( ! STREQ (username, *cp))
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86 continue;
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87
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88 /* See if this group number is already on the list. */
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89 for (n = 0; n < count; ++n)
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90 if (grouplist && grouplist[n] == grp->gr_gid)
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91 break;
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92
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93 /* If it's a new group number, then try to add it to the list. */
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94 if (n == count)
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95 {
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96 if (maxcount != 0)
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97 {
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98 if (count >= maxcount)
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99 goto done;
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100 grouplist[count] = grp->gr_gid;
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101 }
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102 if (count == INT_MAX)
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103 {
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104 errno = EOVERFLOW;
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105 goto done;
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106 }
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107 count++;
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108 }
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109 }
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110 }
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111
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112 if (errno != 0)
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113 count = -1;
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114
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115 done:
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116 {
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117 int saved_errno = errno;
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118 endgrent ();
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119 errno = saved_errno;
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120 }
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121
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122 return count;
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123 }
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124
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125 #endif /* HAVE_GRP_H */