gshadow/putsgent.c

   1 /* Copyright (C) 2009-2021 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 }