1/* Construct a pathname under /proc/self/fd (or /dev/fd for Hurd).
2 Copyright (C) 2020 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#include <fd_to_filename.h>
20
21#include <assert.h>
22#include <string.h>
23
24char *
25__fd_to_filename (int descriptor, struct fd_to_filename *storage)
26{
27 assert (descriptor >= 0);
28
29 char *p = mempcpy (storage->buffer, FD_TO_FILENAME_PREFIX,
30 strlen (FD_TO_FILENAME_PREFIX));
31
32 for (int d = descriptor; p++, (d /= 10) != 0; )
33 continue;
34 *p = '\0';
35 for (int d = descriptor; *--p = '0' + d % 10, (d /= 10) != 0; )
36 continue;
37 return storage->buffer;
38}
39