kc3-lang/gnulib/lib/areadlinkat.c

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• Hash : 32a72f45
  Author :
  Date : 2023-01-01T01:14:21
  

  maint: run 'make update-copyright'
  

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• lib/areadlinkat.c

• /* areadlinkat.c -- readlinkat wrapper to return malloc'd link name
     Unlike xreadlinkat, only call exit on failure to change directory.
  
     Copyright (C) 2001, 2003-2007, 2009-2023 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 3 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, see <https://www.gnu.org/licenses/>.  */
  
  /* Written by Jim Meyering <jim@meyering.net>,
     and Bruno Haible <bruno@clisp.org>,
     and Eric Blake <ebb9@byu.net>.  */
  
  #include <config.h>
  
  /* Specification.  */
  #include "areadlink.h"
  
  #include <stdlib.h>
  
  #include "careadlinkat.h"
  
  #if HAVE_READLINKAT
  
  /* Call readlinkat to get the symbolic link value of FILENAME relative to FD.
     Return a pointer to that NUL-terminated string in malloc'd storage.
     If readlinkat fails, return NULL and set errno (although failure to
     change directory will issue a diagnostic and exit).
     If allocation fails, or if the link value is longer than SIZE_MAX :-),
     return NULL and set errno to ENOMEM.  */
  
  char *
  areadlinkat (int fd, char const *filename)
  {
    return careadlinkat (fd, filename, NULL, 0, NULL, readlinkat);
  }
  
  #else /* !HAVE_READLINKAT */
  
  /* It is more efficient to change directories only once and call
     areadlink, rather than repeatedly call the replacement
     readlinkat.  */
  
  # define AT_FUNC_NAME areadlinkat
  # define AT_FUNC_F1 areadlink
  # define AT_FUNC_POST_FILE_PARAM_DECLS /* empty */
  # define AT_FUNC_POST_FILE_ARGS        /* empty */
  # define AT_FUNC_RESULT char *
  # define AT_FUNC_FAIL NULL
  # include "at-func.c"
  # undef AT_FUNC_NAME
  # undef AT_FUNC_F1
  # undef AT_FUNC_POST_FILE_PARAM_DECLS
  # undef AT_FUNC_POST_FILE_ARGS
  # undef AT_FUNC_RESULT
  # undef AT_FUNC_FAIL
  
  #endif /* !HAVE_READLINKAT */
  

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