summaryrefslogtreecommitdiff
path: root/libbb/simplify_path.c
diff options
context:
space:
mode:
Diffstat (limited to 'libbb/simplify_path.c')
-rw-r--r--libbb/simplify_path.c78
1 files changed, 78 insertions, 0 deletions
diff --git a/libbb/simplify_path.c b/libbb/simplify_path.c
new file mode 100644
index 0000000..4641bae
--- /dev/null
+++ b/libbb/simplify_path.c
@@ -0,0 +1,78 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * simplify_path implementation for busybox
+ *
+ *
+ * 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
+ *
+ */
+
+#include <stdlib.h>
+
+#include "libbb.h"
+
+static inline char *strcpy_overlap(char *dst, const char *src)
+{
+ char *ptr = dst;
+
+ do *dst++ = *src; while (*src++);
+ return ptr;
+}
+
+char *simplify_path(const char *path)
+{
+ char *s, *start, *next;
+
+ if (path[0] == '/')
+ start = xstrdup(path);
+ else {
+ s = xgetcwd(NULL);
+ start = concat_path_file(s, path);
+ free(s);
+ }
+ 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;
+}