1  /* Construct a pathname under /proc/self/fd (or /dev/fd for Hurd).
       2     Copyright (C) 2020-2023 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  #include <_itoa.h>
      24  
      25  char *
      26  __fd_to_filename (int descriptor, struct fd_to_filename *storage)
      27  {
      28    assert (descriptor >= 0);
      29  
      30    char *p = mempcpy (storage->buffer, FD_TO_FILENAME_PREFIX,
      31                       strlen (FD_TO_FILENAME_PREFIX));
      32    *_fitoa_word (descriptor, p, 10, 0) = '\0';
      33  
      34    return storage->buffer;
      35  }