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Sourcecode: fhist version File versions

dirname.c

/*
 *    fhist - file history and comparison tools
 *    Copyright (C) 1998, 2002 Peter Miller;
 *    All rights reserved.
 *
 *    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 2 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, write to the Free Software
 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
 *
 * MANIFEST: functions to manipulate dirnames
 */

#include <sub/dirname.h>
#include <sub/private.h>
#include <trace.h>
#include <wstr_list.h>


static wstring_ty *
wdirname(wstring_ty *s)
{
      wchar_t           *the_end;

      /*
       * strip trailing slashes
       */
      the_end = s->wstr_text + s->wstr_length;
      while (the_end > s->wstr_text && the_end[-1] == '/')
            --the_end;

      /*
       * strip trailing filename
       */
      while (the_end > s->wstr_text && the_end[-1] != '/')
            --the_end;

      /*
       * strip trailing slashes
       */
      while (the_end > s->wstr_text && the_end[-1] == '/')
            --the_end;

      /*
       * If there is anything left, that's the answer.
       */
      if (the_end > s->wstr_text)
            return wstr_n_from_wc(s->wstr_text, the_end - s->wstr_text);

      /*
       * If there is nothing left, but we were given an absolute path,
       * root is the answer.
       */
      if (s->wstr_text[0] == '/')
            return wstr_from_c("/");

      /*
       * Otherwise, the current dirtectory is the answer.
       */
      return wstr_from_c(".");
}


/*
 * NAME
 *    sub_dirname - the dirname substitution
 *
 * SYNOPSIS
 *    wstring_ty *sub_dirname(wstring_list_ty *arg);
 *
 * DESCRIPTION
 *    The sub_dirname function implements the dirname substitution.
 *    The dirname substitution is replaced by the dirname of
 *    the argument path, similar to the dirname(1) command.
 *
 * ARGUMENTS
 *    arg   - list of arguments, including the function name as [0]
 *
 * RETURNS
 *    a pointer to a string in dynamic memory;
 *    or NULL on error, setting suberr appropriately.
 */

wstring_ty *
sub_dirname(sub_context_ty *scp, wstring_list_ty *arg)
{
      wstring_ty  *result;

      trace(("sub_dirname()\n{\n"));
      if (arg->nitems != 2)
      {
            sub_context_error_set(scp, i18n("requires one argument"));
            result = 0;
      }
      else
            result = wdirname(arg->item[1]);
      trace(("return %8.8lX;\n", (long)result));
      trace(("}\n"));
      return result;
}

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