1 files changed, 53 insertions, 0 deletions
diff --git a/libbb/simplify_path.c b/libbb/simplify_path.c
new file mode 100644
index 0000000..367f1f0
--- /dev/null
+++ b/libbb/simplify_path.c
@@ -0,0 +1,53 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * bb_simplify_path implementation for busybox
+ *
+ * Copyright (C) 2001  Manuel Novoa III  <mjn3@codepoet.org>
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+
+#include "libbb.h"
+
+char* FAST_FUNC bb_simplify_path(const char *path)
+{
+	char *s, *start, *p;
+
+	if (path[0] == '/')
+		start = xstrdup(path);
+	else {
+		s = xrealloc_getcwd_or_warn(NULL);
+		start = concat_path_file(s, path);
+		free(s);
+	}
+	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);
+
+	if ((p == start) || (*p != '/')) {	/* not a trailing slash */
+		++p;					/* so keep last character */
+	}
+	*p = 0;
+
+	return start;
+}