kc3-lang/gnulib/lib/backup-find.c

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• Hash : 7b089321
  Author :
  Date : 2025-01-01T09:24:36
  

  maint: run 'make update-copyright'
  

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• lib/backup-find.c

• /* backupfile.c -- make Emacs style backup file names
  
     Copyright 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 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/>.  */
  
  #include <config.h>
  
  #include "backup-internal.h"
  
  #include "argmatch.h"
  #include "xalloc.h"
  
  #include <stdlib.h>
  
  /* Relative to DIR_FD, return the name of a backup file for the
     existing file FILE, allocated with malloc.  Report an error and
     exit if out of memory.  Do not call this function if
     backup_type == no_backups.  */
  
  char *
  find_backup_file_name (int dir_fd, char const *file,
                         enum backup_type backup_type)
  {
    char *result = backupfile_internal (dir_fd, file, backup_type, false);
    if (!result)
      xalloc_die ();
    return result;
  }
  
  static char const *const backup_args[] =
  {
    /* In a series of synonyms, present the most meaningful first, so
       that argmatch_valid be more readable. */
    "none", "off",
    "simple", "never",
    "existing", "nil",
    "numbered", "t",
    NULL
  };
  
  static const enum backup_type backup_types[] =
  {
    no_backups, no_backups,
    simple_backups, simple_backups,
    numbered_existing_backups, numbered_existing_backups,
    numbered_backups, numbered_backups
  };
  
  /* Ensure that these two vectors have the same number of elements,
     not counting the final NULL in the first one.  */
  ARGMATCH_VERIFY (backup_args, backup_types);
  
  /* Return the type of backup specified by VERSION.
     If VERSION is NULL or the empty string, return numbered_existing_backups.
     If VERSION is invalid or ambiguous, fail with a diagnostic appropriate
     for the specified CONTEXT.  Unambiguous abbreviations are accepted.  */
  
  enum backup_type
  get_version (char const *context, char const *version)
  {
    if (version == NULL || *version == 0)
      return numbered_existing_backups;
    else
      return XARGMATCH (context, version, backup_args, backup_types);
  }
  
  
  /* Return the type of backup specified by VERSION.
     If VERSION is NULL, use the value of the envvar VERSION_CONTROL.
     If the specified string is invalid or ambiguous, fail with a diagnostic
     appropriate for the specified CONTEXT.
     Unambiguous abbreviations are accepted.  */
  
  enum backup_type
  xget_version (char const *context, char const *version)
  {
    if (version && *version)
      return get_version (context, version);
    else
      return get_version ("$VERSION_CONTROL", getenv ("VERSION_CONTROL"));
  }
  

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