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/* Construct a pathname under /proc/self/fd (or /dev/fd for Hurd).
Copyright (C) 2020 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 <fd_to_filename.h>
#include <assert.h>
#include <string.h>
char *
__fd_to_filename (int descriptor, struct fd_to_filename *storage)
{
assert (descriptor >= 0);
char *p = mempcpy (storage->buffer, FD_TO_FILENAME_PREFIX,
strlen (FD_TO_FILENAME_PREFIX));
for (int d = descriptor; p++, (d /= 10) != 0; )
continue;
*p = '\0';
for (int d = descriptor; *--p = '0' + d % 10, (d /= 10) != 0; )
continue;
return storage->buffer;
}
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