kc3-lang/gnulib/lib/getugroups.c

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• Hash : 281b825e
  Author :
  Date : 2018-01-01T00:57:25
  

  maint: Run 'make update-copyright'
  

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• lib/getugroups.c

• /* getugroups.c -- return a list of the groups a user is in
  
     Copyright (C) 1990-1991, 1998-2000, 2003-2018 Free Software Foundation, Inc.
  
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
  
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
  
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  
  /* Written by David MacKenzie. */
  
  #include <config.h>
  
  #include "getugroups.h"
  
  #include <errno.h>
  #include <limits.h>
  #include <stdio.h> /* grp.h on alpha OSF1 V2.0 uses "FILE *". */
  #include <string.h>
  #include <unistd.h>
  
  #if !HAVE_GRP_H || defined __ANDROID__
  
  /* Mingw lacks all things related to group management.  The best we
     can do is fail with ENOSYS.
  
     Bionic declares e.g. getgrent() in <grp.h> but it isn't actually
     defined in the library.  */
  
  int
  getugroups (int maxcount _GL_UNUSED,
              gid_t *grouplist _GL_UNUSED,
              char const *username _GL_UNUSED,
              gid_t gid _GL_UNUSED)
  {
    errno = ENOSYS;
    return -1;
  }
  
  #else /* HAVE_GRP_H */
  # include <grp.h>
  
  # define STREQ(a, b) (strcmp (a, b) == 0)
  
  /* Like 'getgroups', but for user USERNAME instead of for the current
     process.  Store at most MAXCOUNT group IDs in the GROUPLIST array.
     If GID is not -1, store it first (if possible).  GID should be the
     group ID (pw_gid) obtained from getpwuid, in case USERNAME is not
     listed in /etc/groups.  Upon failure, set errno and return -1.
     Otherwise, return the number of IDs we've written into GROUPLIST.  */
  
  int
  getugroups (int maxcount, gid_t *grouplist, char const *username,
              gid_t gid)
  {
    int count = 0;
  
    if (gid != (gid_t) -1)
      {
        if (maxcount != 0)
          grouplist[count] = gid;
        ++count;
      }
  
    setgrent ();
    while (1)
      {
        char **cp;
        struct group *grp;
  
        errno = 0;
        grp = getgrent ();
        if (grp == NULL)
          break;
  
        for (cp = grp->gr_mem; *cp; ++cp)
          {
            int n;
  
            if ( ! STREQ (username, *cp))
              continue;
  
            /* See if this group number is already on the list.  */
            for (n = 0; n < count; ++n)
              if (grouplist && grouplist[n] == grp->gr_gid)
                break;
  
            /* If it's a new group number, then try to add it to the list.  */
            if (n == count)
              {
                if (maxcount != 0)
                  {
                    if (count >= maxcount)
                      goto done;
                    grouplist[count] = grp->gr_gid;
                  }
                if (count == INT_MAX)
                  {
                    errno = EOVERFLOW;
                    goto done;
                  }
                count++;
              }
          }
      }
  
    if (errno != 0)
      count = -1;
  
   done:
    {
      int saved_errno = errno;
      endgrent ();
      errno = saved_errno;
    }
  
    return count;
  }
  
  #endif /* HAVE_GRP_H */
  

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