kc3-lang/gnulib/lib/truncate.c

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• Hash : f4d71054
  Author :
  Date : 2017-05-13T02:54:37
  

  truncate: New module.
  
  * lib/unistd.in.h (truncate): New declaration.
  * lib/truncate.c: New file.
  * m4/truncate.m4: New file.
  * m4/unistd_h.m4 (gl_UNISTD_H): Test whether 'truncate' is declared.
  (gl_UNISTD_H_DEFAULTS): Initialize GNULIB_TRUNCATE, HAVE_TRUNCATE,
  REPLACE_TRUNCATE.
  * modules/unistd (Makefile.am): Substitute GNULIB_TRUNCATE,
  HAVE_TRUNCATE, REPLACE_TRUNCATE.
  * modules/truncate: New file.
  * tests/test-unistd-c++.cc (truncate): Test signature.
  * doc/posix-functions/truncate.texi: Mention the new module.
  

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• lib/truncate.c

• /* truncate emulations for native Windows.
     Copyright (C) 2017 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, 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 <http://www.gnu.org/licenses/>.  */
  
  #include <config.h>
  
  /* Specification.  */
  #include <unistd.h>
  
  #include <errno.h>
  #include <fcntl.h>
  
  int
  truncate (const char *filename, off_t length)
  {
    int fd;
  
    if (length == 0)
      {
        fd = open (filename, O_WRONLY | O_TRUNC);
        if (fd < 0)
          return -1;
      }
    else
      {
        fd = open (filename, O_WRONLY);
        if (fd < 0)
          return -1;
        if (ftruncate (fd, length) < 0)
          {
            int saved_errno = errno;
            close (fd);
            errno = saved_errno;
            return -1;
          }
      }
    close (fd);
    return 0;
  }
  

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