1  /* Copyright (C) 2009-2023 Free Software Foundation, Inc.
       2     This file is part of the GNU C Library.
       3  
       4     The GNU C Library is free software; you can redistribute it and/or
       5     modify it under the terms of the GNU Lesser General Public
       6     License as published by the Free Software Foundation; either
       7     version 2.1 of the License, or (at your option) any later version.
       8  
       9     The GNU C Library is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12     Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public
      15     License along with the GNU C Library; if not, see
      16     <https://www.gnu.org/licenses/>.  */
      17  
      18  #include <errno.h>
      19  #include <stdbool.h>
      20  #include <stdio.h>
      21  #include <gshadow.h>
      22  #include <nss.h>
      23  
      24  #define _S(x)	x ? x : ""
      25  
      26  
      27  /* Write an entry to the given stream.
      28     This must know the format of the group file.  */
      29  int
      30  putsgent (const struct sgrp *g, FILE *stream)
      31  {
      32    int errors = 0;
      33  
      34    if (g->sg_namp == NULL || !__nss_valid_field (g->sg_namp)
      35        || !__nss_valid_field (g->sg_passwd)
      36        || !__nss_valid_list_field (g->sg_adm)
      37        || !__nss_valid_list_field (g->sg_mem))
      38      {
      39        __set_errno (EINVAL);
      40        return -1;
      41      }
      42  
      43    _IO_flockfile (stream);
      44  
      45    if (fprintf (stream, "%s:%s:", g->sg_namp, _S (g->sg_passwd)) < 0)
      46      ++errors;
      47  
      48    bool first = true;
      49    char **sp = g->sg_adm;
      50    if (sp != NULL)
      51      while (*sp != NULL)
      52        {
      53  	if (fprintf (stream, "%s%s", first ? "" : ",", *sp++) < 0)
      54  	  {
      55  	    ++errors;
      56  	    break;
      57  	  }
      58  	first = false;
      59        }
      60    if (putc_unlocked (':', stream) == EOF)
      61      ++errors;
      62  
      63    first = true;
      64    sp = g->sg_mem;
      65    if (sp != NULL)
      66      while (*sp != NULL)
      67        {
      68  	if (fprintf (stream, "%s%s", first ? "" : ",", *sp++) < 0)
      69  	  {
      70  	    ++errors;
      71  	    break;
      72  	  }
      73  	first = false;
      74        }
      75    if (putc_unlocked ('\n', stream) == EOF)
      76      ++errors;
      77  
      78    _IO_funlockfile (stream);
      79  
      80    return errors ? -1 : 0;
      81  }