1 files changed, 64 insertions, 0 deletions

diff --git a/busybox/libbb/simplify_path.c b/busybox/libbb/simplify_path.c
new file mode 100644
index 000000000..743133cd1
--- /dev/null
+++ b/busybox/libbb/simplify_path.c
@@ -0,0 +1,64 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * bb_simplify_path implementation for busybox
+ *
+ * Copyright (C) 2001  Manuel Novoa III  <mjn3@codepoet.org>
+ *
+ * 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"
+
+char *bb_simplify_path(const char *path)
+{
+        char *s, *start, *p;
+
+        if (path[0] == '/')
+                start = bb_xstrdup(path);
+        else {
+                s = xgetcwd(NULL);
+                start = concat_path_file(s, path);
+                free(s);
+        }
+        p = s = start;
+
+        do {
+                if (*p == '/') {
+                        if (*s == '/') {        /* skip duplicate (or initial) slash */
+                                continue;
+                        } else if (*s == '.') {
+                                if (s[1] == '/' || s[1] == 0) { /* remove extra '.' */
+                                        continue;
+                                } else if ((s[1] == '.') && (s[2] == '/' || s[2] == 0)) {
+                                        ++s;
+                                        if (p > start) {
+                                                while (*--p != '/');    /* omit previous dir */
+                                        }
+                                        continue;
+                                }
+                        }
+                }
+                *++p = *s;
+        } while (*++s);
+
+        if ((p == start) || (*p != '/')) {      /* not a trailing slash */
+                ++p;                                    /* so keep last character */
+        }
+        *p = 0;
+
+        return start;
+}