kc3-lang/gnulib/lib/truncate.c

• Show log

  Commit

• Hash : 1d51ff0b
  Author :
  Date : 2025-09-09T12:38:31
  

  faccessat, truncate: Remove support for OSF/1.
  
  * lib/faccessat.c: Simplify include of <unistd.h>.
  * lib/truncate.c: Likewise.
  

Download

• lib/truncate.c

• /* truncate emulations for native Windows.
     Copyright (C) 2017-2025 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 <https://www.gnu.org/licenses/>.  */
  
  /* If the user's config.h happens to include <unistd.h>, let it include only
     the system's <unistd.h> here, so that orig_faccessat doesn't recurse to
     rpl_faccessat.  */
  #define _GL_INCLUDING_UNISTD_H
  #include <config.h>
  
  /* Get the original definition of truncate.  */
  #include <unistd.h>
  
  #include <errno.h>
  #include <fcntl.h>
  #include <string.h>
  #include <sys/stat.h>
  #undef _GL_INCLUDING_UNISTD_H
  
  #if TRUNCATE_TRAILING_SLASH_BUG
  static int
  orig_truncate (const char *filename, off_t length)
  {
    return truncate (filename, length);
  }
  #endif
  
  /* Specification.  */
  #include <unistd.h>
  
  int
  truncate (const char *filename, off_t length)
  {
  #if TRUNCATE_TRAILING_SLASH_BUG
    /* Use the original truncate(), but correct the trailing slash handling.  */
    size_t len = strlen (filename);
    if (len && filename[len - 1] == '/')
      {
        struct stat st;
        if (stat (filename, &st) == 0)
          errno = (S_ISDIR (st.st_mode) ? EISDIR : ENOTDIR);
        return -1;
      }
    return orig_truncate (filename, length);
  #else
    int fd;
  
    if (length == 0)
      {
        fd = open (filename, O_WRONLY | O_TRUNC | O_CLOEXEC);
        if (fd < 0)
          return -1;
      }
    else
      {
        fd = open (filename, O_WRONLY | O_CLOEXEC);
        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;
  #endif
  }
  

Download