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libiconv 1.16

    1: /* areadlink.c -- readlink wrapper to return the link name in malloc'd storage
    2:    Unlike xreadlink and xreadlink_with_size, don't ever call exit.
    3: 
    4:    Copyright (C) 2001, 2003-2007, 2009-2019 Free Software Foundation, Inc.
    5: 
    6:    This program is free software: you can redistribute it and/or modify
    7:    it under the terms of the GNU General Public License as published by
    8:    the Free Software Foundation; either version 3 of the License, or
    9:    (at your option) any later version.
   10: 
   11:    This program is distributed in the hope that it will be useful,
   12:    but WITHOUT ANY WARRANTY; without even the implied warranty of
   13:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   14:    GNU General Public License for more details.
   15: 
   16:    You should have received a copy of the GNU General Public License
   17:    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
   18: 
   19: /* Written by Jim Meyering <jim@meyering.net>
   20:    and Bruno Haible <bruno@clisp.org>.  */
   21: 
   22: #include <config.h>
   23: 
   24: /* Specification.  */
   25: #include "areadlink.h"
   26: 
   27: #include "careadlinkat.h"
   28: 
   29: #include <stdlib.h>
   30: #include <unistd.h>
   31: 
   32: /* Get the symbolic link value of FILENAME and put it into BUFFER, with
   33:    size BUFFER_SIZE.  This function acts like readlink but has
   34:    readlinkat's signature.  */
   35: static ssize_t
   36: careadlinkatcwd (int fd, char const *filename, char *buffer,
   37:                  size_t buffer_size)
   38: {
   39:   /* FD must be AT_FDCWD here, otherwise the caller is using this
   40:      function in contexts it was not meant for.  */
   41:   if (fd != AT_FDCWD)
   42:     abort ();
   43:   return readlink (filename, buffer, buffer_size);
   44: }
   45: 
   46: /* Call readlink to get the symbolic link value of FILENAME.
   47:    Return a pointer to that NUL-terminated string in malloc'd storage.
   48:    If readlink fails, return NULL and set errno.
   49:    If allocation fails, or if the link value is longer than SIZE_MAX :-),
   50:    return NULL and set errno to ENOMEM.  */
   51: 
   52: char *
   53: areadlink (char const *filename)
   54: {
   55:   return careadlinkat (AT_FDCWD, filename, NULL, 0, NULL, careadlinkatcwd);
   56: }