diff options
Diffstat (limited to 'nss/putgrent.c')
-rw-r--r-- | nss/putgrent.c | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/nss/putgrent.c b/nss/putgrent.c new file mode 100644 index 0000000..93caea5 --- /dev/null +++ b/nss/putgrent.c @@ -0,0 +1,76 @@ +/* Copyright (C) 1991-2023 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library 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. + + The GNU C Library 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 the GNU C Library; if not, see + <https://www.gnu.org/licenses/>. */ + +#include <errno.h> +#include <nss.h> +#include <stdio.h> +#include <string.h> +#include <grp.h> + +#define flockfile(s) _IO_flockfile (s) +#define funlockfile(s) _IO_funlockfile (s) + +#define _S(x) x ? x : "" + +/* Write an entry to the given stream. + This must know the format of the group file. */ +int +putgrent (const struct group *gr, FILE *stream) +{ + int retval; + + if (__glibc_unlikely (gr == NULL) || __glibc_unlikely (stream == NULL) + || gr->gr_name == NULL || !__nss_valid_field (gr->gr_name) + || !__nss_valid_field (gr->gr_passwd) + || !__nss_valid_list_field (gr->gr_mem)) + { + __set_errno (EINVAL); + return -1; + } + + flockfile (stream); + + if (gr->gr_name[0] == '+' || gr->gr_name[0] == '-') + retval = fprintf (stream, "%s:%s::", + gr->gr_name, _S (gr->gr_passwd)); + else + retval = fprintf (stream, "%s:%s:%lu:", + gr->gr_name, _S (gr->gr_passwd), + (unsigned long int) gr->gr_gid); + if (__builtin_expect (retval, 0) < 0) + { + funlockfile (stream); + return -1; + } + + if (gr->gr_mem != NULL) + { + for (size_t i = 0; gr->gr_mem[i] != NULL; i++) + if (fprintf (stream, i == 0 ? "%s" : ",%s", gr->gr_mem[i]) < 0) + { + /* What else can we do? */ + funlockfile (stream); + return -1; + } + } + + retval = fputc_unlocked ('\n', stream); + + funlockfile (stream); + + return retval < 0 ? -1 : 0; +} |