.
[glibc/history.git] / grp / putgrent.c
blob382d6a4daa88a8666ead0761d08899e7192b0a5f
1 /* Copyright (C) 1991,92,96,98,99,2000,2005 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
17 02111-1307 USA. */
19 #include <errno.h>
20 #include <stdio.h>
21 #include <grp.h>
23 #ifdef USE_IN_LIBIO
24 # define flockfile(s) _IO_flockfile (s)
25 # define funlockfile(s) _IO_funlockfile (s)
26 #endif
28 #define _S(x) x ? x : ""
30 /* Write an entry to the given stream.
31 This must know the format of the group file. */
32 int
33 putgrent (gr, stream)
34 const struct group *gr;
35 FILE *stream;
37 int retval;
39 if (__builtin_expect (gr == NULL, 0) || __builtin_expect (stream == NULL, 0))
41 __set_errno (EINVAL);
42 return -1;
45 flockfile (stream);
47 if (gr->gr_name[0] == '+' || gr->gr_name[0] == '-')
48 retval = fprintf (stream, "%s:%s::",
49 gr->gr_name, _S (gr->gr_passwd));
50 else
51 retval = fprintf (stream, "%s:%s:%lu:",
52 gr->gr_name, _S (gr->gr_passwd),
53 (unsigned long int) gr->gr_gid);
54 if (__builtin_expect (retval, 0) < 0)
56 funlockfile (stream);
57 return -1;
60 if (gr->gr_mem != NULL)
62 int i;
64 for (i = 0 ; gr->gr_mem[i] != NULL; i++)
65 if (fprintf (stream, i == 0 ? "%s" : ",%s", gr->gr_mem[i]) < 0)
67 /* What else can we do? */
68 funlockfile (stream);
69 return -1;
73 retval = fputc_unlocked ('\n', stream);
75 funlockfile (stream);
77 return retval < 0 ? -1 : 0;