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/* libnul
*
* Copyright (C) 2006-2007 Red Hat, Inc.
* Copyright (C) 2009 Soren Sandmann
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General
* Public License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*
*/
#include <string.h>
#include "libnul.h"
/* nul_canonicalize_filename cutted and pasted from GIO
*
* Author: Alexander Larsson
*/
char *
nul_canonicalize_filename (const char *filename)
{
char *canon, *start, *p, *q;
char *cwd;
int i;
g_return_val_if_fail (filename != NULL, NULL);
if (!g_path_is_absolute (filename))
{
cwd = g_get_current_dir ();
canon = g_build_filename (cwd, filename, NULL);
g_free (cwd);
}
else
canon = g_strdup (filename);
start = (char *)g_path_skip_root (canon);
/* POSIX allows double slashes at the start to
* mean something special (as does windows too).
* So, "//" != "/", but more than two slashes
* is treated as "/".
*/
i = 0;
for (p = start - 1;
(p >= canon) &&
G_IS_DIR_SEPARATOR (*p);
p--)
i++;
if (i > 2)
{
i -= 1;
start -= i;
memmove (start, start+i, strlen (start+i)+1);
}
p = start;
while (*p != 0)
{
if (p[0] == '.' && (p[1] == 0 || G_IS_DIR_SEPARATOR (p[1])))
{
memmove (p, p+1, strlen (p+1)+1);
}
else if (p[0] == '.' && p[1] == '.' &&
(p[2] == 0 || G_IS_DIR_SEPARATOR (p[2])))
{
q = p + 2;
/* Skip previous separator */
p = p - 2;
if (p < start)
p = start;
while (p > start && !G_IS_DIR_SEPARATOR (*p))
p--;
if (G_IS_DIR_SEPARATOR (*p))
*p++ = G_DIR_SEPARATOR;
memmove (p, q, strlen (q)+1);
}
else
{
/* Skip until next separator */
while (*p != 0 && !G_IS_DIR_SEPARATOR (*p))
p++;
if (*p != 0)
{
/* Canonicalize one separator */
*p++ = G_DIR_SEPARATOR;
}
}
/* Remove additional separators */
q = p;
while (*q && G_IS_DIR_SEPARATOR (*q))
q++;
if (p != q)
memmove (p, q, strlen (q)+1);
}
/* Remove trailing slashes */
if (p > start && G_IS_DIR_SEPARATOR (*(p-1)))
*(p-1) = 0;
return canon;
}
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