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-rw-r--r--lib/fstree/canonicalize_name.c61
1 files changed, 61 insertions, 0 deletions
diff --git a/lib/fstree/canonicalize_name.c b/lib/fstree/canonicalize_name.c
new file mode 100644
index 0000000..15c02be
--- /dev/null
+++ b/lib/fstree/canonicalize_name.c
@@ -0,0 +1,61 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * canonicalize_name.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "config.h"
+
+#include "fstree.h"
+
+static void normalize_slashes(char *filename)
+{
+ char *dst = filename, *src = filename;
+
+ while (*src == '/' || *src == '\\')
+ ++src;
+
+ while (*src != '\0') {
+ if (*src == '/' || *src == '\\') {
+ while (*src == '/' || *src == '\\')
+ ++src;
+ if (*src == '\0')
+ break;
+ *(dst++) = '/';
+ } else {
+ *(dst++) = *(src++);
+ }
+ }
+
+ *dst = '\0';
+}
+
+int canonicalize_name(char *filename)
+{
+ char *dst = filename, *src = filename;
+
+ normalize_slashes(filename);
+
+ while (*src != '\0') {
+ if (src[0] == '.') {
+ if (src[1] == '\0')
+ break;
+ if (src[1] == '/') {
+ src += 2;
+ continue;
+ }
+ if (src[1] == '.' && (src[2] == '/' || src[2] == '\0'))
+ return -1;
+ }
+
+ while (*src != '\0' && *src != '/')
+ *(dst++) = *(src++);
+
+ if (*src == '/')
+ *(dst++) = *(src++);
+ }
+
+ *dst = '\0';
+ normalize_slashes(filename);
+ return 0;
+}