glibc/manual/examples/mkdirent.c

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/* Example for creating a struct dirent object for use with glob.
Copyright (C) 2016-2018 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, if not, see <http://www.gnu.org/licenses/>.
*/
#include <dirent.h>
#include <errno.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
struct dirent *
mkdirent (const char *name)
{
size_t dirent_size = offsetof (struct dirent, d_name) + 1;
size_t name_length = strlen (name);
size_t total_size = dirent_size + name_length;
if (total_size < dirent_size)
{
errno = ENOMEM;
return NULL;
}
struct dirent *result = malloc (total_size);
if (result == NULL)
return NULL;
result->d_type = DT_UNKNOWN;
result->d_ino = 1; /* Do not skip this entry. */
memcpy (result->d_name, name, name_length + 1);
return result;
}