/* vi: set sw=4 ts=4: */
/*
- * simplify_path implementation for busybox
+ * bb_simplify_path implementation for busybox
*
+ * Copyright (C) 2001 Manuel Novoa III <mjn3@codepoet.org>
*
- * Copyright (C) 2001 Vladimir N. Oleynik <dzo@simtreas.ru>
- *
- *
- * 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 02111-1307 USA
- *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
-
-#include <stdlib.h>
-
#include "libbb.h"
-static inline char *strcpy_overlap(char *dst, const char *src)
+char* FAST_FUNC bb_simplify_abs_path_inplace(char *start)
{
- char *ptr = dst;
+ char *s, *p;
+
+ p = s = start;
+ do {
+ if (*p == '/') {
+ if (*s == '/') { /* skip duplicate (or initial) slash */
+ continue;
+ }
+ if (*s == '.') {
+ if (s[1] == '/' || !s[1]) { /* remove extra '.' */
+ continue;
+ }
+ if ((s[1] == '.') && (s[2] == '/' || !s[2])) {
+ ++s;
+ if (p > start) {
+ while (*--p != '/') /* omit previous dir */
+ continue;
+ }
+ continue;
+ }
+ }
+ }
+ *++p = *s;
+ } while (*++s);
- do *dst++ = *src; while (*src++);
- return ptr;
+ if ((p == start) || (*p != '/')) { /* not a trailing slash */
+ ++p; /* so keep last character */
+ }
+ *p = '\0';
+ return p;
}
-char *simplify_path(const char *path)
+char* FAST_FUNC bb_simplify_path(const char *path)
{
- char *s, *start, *next;
+ char *s, *p;
if (path[0] == '/')
- start = xstrdup(path);
+ s = xstrdup(path);
else {
- s = xgetcwd(NULL);
- start = concat_path_file(s, path);
- free(s);
+ p = xrealloc_getcwd_or_warn(NULL);
+ s = concat_path_file(p, path);
+ free(p);
}
- s = start;
- /* remove . and .. */
- while(*s) {
- if(*s++ == '/' && (*s == '/' || *s == 0)) {
- /* remove duplicate and trailing slashes */
- s = strcpy_overlap(s-1, s);
- }
- else if(*(s-1) == '.' && *(s-2)=='/') {
- if(*s == '/' || *s == 0) {
- /* remove . */
- s = strcpy_overlap(s-1, s); /* maybe set // */
- s--;
- } else if(*s == '.') {
- next = s+1; /* set after ".." */
- if(*next == '/' || *next == 0) { /* "../" */
- if((s-=2) > start)
- /* skip previous dir */
- do s--; while(*s != '/');
- /* remove previous dir */
- strcpy_overlap(s, next);
- }
- }
- }
- }
- if(start[0]==0) {
- start[0]='/';
- start[1]=0;
- }
- return start;
+ bb_simplify_abs_path_inplace(s);
+ return s;
}