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/*
* fhist - file history and comparison tools
* Copyright (C) 1998, 2002, 2008 Peter Miller
*
* 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
* <http://www.gnu.org/licenses/>.
*/
#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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