1 files changed, 56 insertions, 0 deletions
diff --git a/lib/util/canonicalize_name.c b/lib/util/canonicalize_name.c
new file mode 100644
index 0000000..6703b66
--- /dev/null
+++ b/lib/util/canonicalize_name.c
@@ -0,0 +1,56 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+#include <string.h>
+
+#include "util.h"
+
+int canonicalize_name(char *filename)
+{
+	char *ptr = filename;
+	int i;
+
+	while (*ptr == '/')
+		++ptr;
+
+	if (ptr != filename) {
+		memmove(filename, ptr, strlen(ptr) + 1);
+		ptr = filename;
+	}
+
+	while (*ptr != '\0') {
+		if (*ptr == '/') {
+			for (i = 0; ptr[i] == '/'; ++i)
+				;
+
+			if (i > 1)
+				memmove(ptr + 1, ptr + i, strlen(ptr + i) + 1);
+		}
+
+		if (ptr[0] == '/' && ptr[1] == '\0') {
+			*ptr = '\0';
+			break;
+		}
+
+		++ptr;
+	}
+
+	ptr = filename;
+
+	while (*ptr != '\0') {
+		if (ptr[0] == '.') {
+			if (ptr[1] == '/' || ptr[1] == '\0')
+				return -1;
+
+			if (ptr[1] == '.' &&
+			    (ptr[2] == '/' || ptr[2] == '\0')) {
+				return -1;
+			}
+		}
+
+		while (*ptr != '\0' && *ptr != '/')
+			++ptr;
+		if (*ptr == '/')
+			++ptr;
+	}
+
+	return 0;
+}