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/*
* cook - file construction tool
* Copyright (C) 2000, 2006, 2007 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 flattens
*/
#include <common/str_list.h>
#include <c_incl/flatten.h>
static void
string_list_remove_nth(string_list_ty * slp, size_t n)
{
if (n >= slp->nstrings)
return;
str_free(slp->string[n]);
slp->nstrings--;
while (n < slp->nstrings)
{
slp->string[n] = slp->string[n + 1];
++n;
}
}
string_ty *
flatten(string_ty *filename)
{
string_list_ty sl;
static string_ty *root;
static string_ty *dot;
static string_ty *dotdot;
size_t pos;
size_t start;
size_t j;
string_ty *s;
/*
* Create some things we are going to need.
*/
if (!root)
{
root = str_from_c("");
dot = str_from_c(".");
dotdot = str_from_c("..");
}
/*
* leading slash is special
*/
pos = 0;
string_list_constructor(&sl);
if (filename->str_text[0] == '/')
{
++pos;
string_list_append(&sl, root);
}
/*
* Break it into slash-separaed words.
*/
for (;;)
{
while (pos < filename->str_length && filename->str_text[pos] == '/')
++pos;
if (pos >= filename->str_length)
break;
start = pos;
for (;;)
{
++pos;
if (pos >= filename->str_length || filename->str_text[pos] == '/')
break;
}
/*
* remember each word (except ".")
*/
s = str_n_from_c(filename->str_text + start, pos - start);
if (!str_equal(s, dot))
string_list_append(&sl, s);
str_free(s);
}
/*
* Try as hard as possible to chuck out redundant stuff.
*/
for (;;)
{
int changed = 0;
/*
* "/.." -> "/"
*/
if
(
sl.nstrings >= 2
&&
str_equal(sl.string[0], root)
&&
str_equal(sl.string[1], dotdot)
)
{
string_list_remove_nth(&sl, 1);
++changed;
}
/*
* "name/.." -> ""
*/
for (j = 0; j + 1 < sl.nstrings; ++j)
{
if (str_equal(sl.string[j], root))
continue;
if (str_equal(sl.string[j], dotdot))
continue;
if (!str_equal(sl.string[j + 1], dotdot))
continue;
string_list_remove_nth(&sl, j);
string_list_remove_nth(&sl, j);
++changed;
--j;
}
/*
* loop if anything changed,
* bail if we can't find more to do
*/
if (!changed)
break;
}
/*
* reassemble the "cleaned" path
*/
s = wl2str_respect_empty(&sl, 0, sl.nstrings, "/", 1);
string_list_destructor(&sl);
return s;
}
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