68 lines
1.6 KiB
C
68 lines
1.6 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* simplify_path implementation for busybox
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*
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*
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* Copyright (C) 2001 Manuel Novoa III <mjn3@opensource.lineo.com>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <stdlib.h>
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#include "libbb.h"
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char *simplify_path(const char *path)
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{
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char *s, *start, *p;
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if (path[0] == '/')
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start = xstrdup(path);
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else {
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s = xgetcwd(NULL);
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start = concat_path_file(s, path);
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free(s);
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}
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p = s = start;
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do {
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if (*p == '/') {
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if (*s == '/') { /* skip duplicate (or initial) slash */
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continue;
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} else if (*s == '.') {
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if (s[1] == '/' || s[1] == 0) { /* remove extra '.' */
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continue;
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} else if ((s[1] == '.') && (s[2] == '/' || s[2] == 0)) {
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++s;
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if (p > start) {
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while (*--p != '/'); /* omit previous dir */
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}
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continue;
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}
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}
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}
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*++p = *s;
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} while (*++s);
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if ((p == start) || (*p != '/')) { /* not a trailing slash */
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++p; /* so keep last character */
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}
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*p = 0;
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return start;
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}
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