getugroups.c

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Hash : 26fd3545
Author :
Date : 2025-09-16T23:08:01

stringeq: prefer streq to strcmp in other modules

* lib/acl-internal.c, lib/argmatch.c, lib/argp-help.c:
* lib/argp-parse.c, lib/bcp47.c, lib/c32_get_mapping.c:
* lib/c32_get_type_test.c, lib/concat-filename.c:
* lib/cpu-supports.h, lib/dfa.c, lib/duplocale.c, lib/exclude.c:
* lib/findprog-in.c, lib/findprog.c, lib/fopen.c, lib/freopen.c:
* lib/fts.c, lib/gen-uni-tables.c, lib/getfilecon.c:
* lib/getlogin.c, lib/getugroups.c, lib/hard-locale.c:
* lib/hashcode-named-file.c, lib/hashkey-string.c:
* lib/iconv_open.c, lib/idcache.c, lib/lc-charset-unicode.c:
* lib/localcharset.c, lib/localename-environ.c:
* lib/localename-unsafe.c, lib/mbs_endswith.c, lib/mountlist.c:
* lib/newlocale.c, lib/nl_langinfo.c, lib/nproc.c, lib/open.c:
* lib/os2-spawn.c, lib/parse-datetime.y, lib/popen.c:
* lib/progreloc.c, lib/propername.c, lib/pt_chown.c, lib/putenv.c:
* lib/qcopy-acl.c, lib/readutmp.c, lib/rpmatch.c:
* lib/setlocale-fixes.c, lib/setlocale.c, lib/sig2str.c:
* lib/spawni.c, lib/stat.c, lib/str_endswith.c, lib/streq.h:
* lib/striconveha.c, lib/struniq.h, lib/supersede.c:
* lib/time_rz.c, lib/unicodeio.c, lib/vasnprintf.c:
* lib/vc-mtime.c, lib/wctrans-impl.h, lib/wctype-impl.h:
Prefer streq to strcmp when either will do.
Do not make this change to files shared with glibc.
Do not make the change to test files, at least not for now.
* lib/gen-uni-tables.c (streq): New static function, in same style.
* modules/acl-permissions, modules/argp, modules/c32_get_mapping:
* modules/c32_get_type_test, modules/concat-filename:
* modules/cpu-supports, modules/dfa, modules/duplocale:
* modules/exclude, modules/findprog, modules/findprog-in:
* modules/fopen, modules/fopen-gnu, modules/freopen, modules/fts:
* modules/getlocalename_l-simple, modules/getlocalename_l-unsafe:
* modules/getlogin, modules/getugroups, modules/hard-locale:
* modules/hashcode-named-file, modules/hashkey-string:
* modules/iconv_open, modules/idcache, modules/localcharset:
* modules/localename, modules/localename-unsafe:
* modules/mbs_endswith, modules/mountlist, modules/newlocale:
* modules/nl_langinfo, modules/nproc, modules/open:
* modules/parse-datetime, modules/popen:
* modules/posix_spawn-internal, modules/propername:
* modules/pt_chown, modules/putenv-gnu, modules/qcopy-acl:
* modules/rpmatch, modules/selinux-h, modules/setenv:
* modules/setlocale, modules/setlocale-fixes, modules/sig2str:
* modules/spawn-pipe, modules/stat, modules/str_endswith:
* modules/streq, modules/striconveha, modules/supersede:
* modules/time_rz, modules/uchar-h, modules/unicodeio:
* modules/uniconv/base, modules/wctrans, modules/wctype:
(Depends-on): Add stringeq.

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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, 2003-2025 Free Software Foundation, Inc.

   This file is free software: you can redistribute it and/or modify
   it under the terms of the GNU Lesser General Public License as
   published by the Free Software Foundation; either version 2.1 of the
   License, or (at your option) any later version.

   This file 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 Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser 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 (_GL_UNUSED int maxcount,
            _GL_UNUSED gid_t *grouplist,
            _GL_UNUSED char const *username,
            _GL_UNUSED gid_t gid)
{
  errno = ENOSYS;
  return -1;
}

#else /* HAVE_GRP_H */
# include <grp.h>

/* 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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kc3-lang/gnulib/lib/getugroups.c

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lib/getugroups.c