[winpr,path] implement normalize and IsRootOf functions

winpr/include/winpr/path.h

@@ -342,6 +342,48 @@ extern "C"
 	WINPR_ATTR_MALLOC(free, 1)
 	WINPR_API char* GetCombinedPath(const char* basePath, const char* subPath);
 
+	/** @brief creates a normalized version of \b path
+	 *  Duplicate path delimiters  and '.' in path are removed, '..' is resolved. The normalized
+	 * path does not contain any of these.
+	 *
+	 *  @param path The path to normalize
+	 *  @return A normalized version of \b path or \b NULL in case of an error
+	 *  @since version 3.10.0
+	 */
+	WINPR_ATTR_MALLOC(free, 1)
+	WINPR_API WCHAR* winpr_NormalizePathW(const WCHAR* path);
+
+	/** @brief creates a normalized version of \b path
+	 *  Duplicate path delimiters  and '.' in path are removed, '..' is resolved. The normalized
+	 * path does not contain any of these.
+	 *
+	 *  @param path The path to normalize
+	 *  @return A normalized version of \b path or \b NULL in case of an error
+	 *  @since version 3.10.0
+	 */
+	WINPR_ATTR_MALLOC(free, 1)
+	WINPR_API char* winpr_NormalizePathA(const char* path);
+
+	/** @brief Checks if path \b root is the root of \b path
+	 * Both paths are normalized first and then checked if \b root is a prefix of \b path.
+	 *
+	 *  @param root The root path, must be an absolute path.
+	 *  @param path The path to check
+	 *  @return \b TRUE if \b path has \b root as parent
+	 *  @since version 3.10.0
+	 */
+	WINPR_API BOOL winpr_PathIsRootOfA(const char* root, const char* path);
+
+	/** @brief Checks if path \b root is the root of \b path
+	 * Both paths are normalized first and then checked if \b root is a prefix of \b path
+	 *
+	 *  @param root The root path, must be an absolute path.
+	 *  @param path The path to check
+	 *  @return \b TRUE if \b path has \b root as parent
+	 *  @since version 3.10.0
+	 */
+	WINPR_API BOOL winpr_PathIsRootOfW(const WCHAR* root, const WCHAR* path);
+
 	WINPR_API BOOL PathMakePathA(LPCSTR path, LPSECURITY_ATTRIBUTES lpAttributes);
 	WINPR_API BOOL PathMakePathW(LPCWSTR path, LPSECURITY_ATTRIBUTES lpAttributes);
 

winpr/libwinpr/path/path.c

@@ -21,12 +21,15 @@
 #include <winpr/version.h>
 #include <winpr/build-config.h>
 
+#include <winpr/assert.h>
 #include <winpr/crt.h>
 #include <winpr/tchar.h>
 
 #include <winpr/path.h>
 #include <winpr/file.h>
 
+#include <cwalk.h>
+
 #define STR(x) #x
 
 #define PATH_SLASH_CHR '/'
@@ -1214,3 +1217,70 @@ char* winpr_GetConfigFilePath(BOOL system, const char* filename)
 
 	return path;
 }
+
+char* winpr_NormalizePathA(const char* path)
+{
+	const size_t rc = cwk_path_normalize(path, NULL, 0);
+	if (rc == 0)
+		return NULL;
+	char* npath = calloc(rc + 2, sizeof(char));
+	if (!npath)
+		return NULL;
+	const size_t chk = cwk_path_normalize(path, npath, rc + 1);
+	WINPR_ASSERT(chk == rc);
+	if (chk != rc)
+	{
+		free(npath);
+		return NULL;
+	}
+	return npath;
+}
+
+WCHAR* winpr_NormalizePathW(const WCHAR* path)
+{
+	char* utf = ConvertWCharToUtf8Alloc(path, NULL);
+	if (!utf)
+		return NULL;
+	char* nutf = winpr_NormalizePathA(utf);
+	free(utf);
+	if (!nutf)
+		return NULL;
+	WCHAR* wstr = ConvertUtf8ToWCharAlloc(nutf, NULL);
+	free(nutf);
+	return wstr;
+}
+
+BOOL winpr_PathIsRootOfA(const char* root, const char* path)
+{
+	BOOL rc = FALSE;
+	if (!cwk_path_is_absolute(root))
+		return FALSE;
+
+	char* nroot = winpr_NormalizePathA(root);
+	char* npath = winpr_NormalizePathA(path);
+	if (npath && nroot)
+	{
+		const size_t len = strlen(root);
+		const size_t ilen = cwk_path_get_intersection(nroot, npath);
+		rc = len == ilen;
+	}
+	free(npath);
+	free(nroot);
+
+	return rc;
+}
+
+BOOL winpr_PathIsRootOfW(const WCHAR* root, const WCHAR* path)
+{
+	if (!root || !path)
+		return FALSE;
+
+	char* utfroot = ConvertWCharToUtf8Alloc(root, NULL);
+	char* utfpath = ConvertWCharToUtf8Alloc(path, NULL);
+	BOOL rc = FALSE;
+	if (utfroot && utfpath)
+		rc = winpr_PathIsRootOfA(utfroot, utfpath);
+	free(utfroot);
+	free(utfpath);
+	return rc;
+}

winpr/libwinpr/path/shell.c

@@ -19,6 +19,7 @@
  */
 
 #include <winpr/config.h>
+#include <winpr/assert.h>
 #include <winpr/build-config.h>
 
 #include <stdio.h>
@@ -26,6 +27,8 @@
 #include <string.h>
 #include <sys/stat.h>
 
+#include <cwalk.h>
+
 #include <winpr/crt.h>
 #include <winpr/platform.h>
 #include <winpr/file.h>
@@ -447,53 +450,22 @@ char* GetEnvironmentSubPath(char* name, const char* path)
 
 char* GetCombinedPath(const char* basePath, const char* subPath)
 {
-	size_t length = 0;
+	const size_t len = cwk_path_join(basePath, subPath, NULL, 0);
-	HRESULT status = 0;
+	if (len == 0)
-	char* path = NULL;
+		return NULL;
-	char* subPathCpy = NULL;
-	size_t basePathLength = 0;
-	size_t subPathLength = 0;
-
-	if (basePath)
-		basePathLength = strlen(basePath);
-
-	if (subPath)
-		subPathLength = strlen(subPath);
-
-	length = basePathLength + subPathLength + 1;
-	path = (char*)calloc(1, length + 1);
 
+	char* path = calloc(len + 2, sizeof(char));
 	if (!path)
-		goto fail;
+		return NULL;
 
-	if (basePath)
+	const size_t chk = cwk_path_join(basePath, subPath, path, len + 1);
-		CopyMemory(path, basePath, basePathLength);
+	WINPR_ASSERT(len == chk);
-
+	if (len != chk)
-	if (FAILED(PathCchConvertStyleA(path, basePathLength, PATH_STYLE_NATIVE)))
+	{
-		goto fail;
+		free(path);
-
+		return NULL;
-	if (!subPath)
+	}
-		return path;
-
-	subPathCpy = _strdup(subPath);
-
-	if (!subPathCpy)
-		goto fail;
-
-	if (FAILED(PathCchConvertStyleA(subPathCpy, subPathLength, PATH_STYLE_NATIVE)))
-		goto fail;
-
-	status = NativePathCchAppendA(path, length + 1, subPathCpy);
-	if (FAILED(status))
-		goto fail;
-
-	free(subPathCpy);
 	return path;
-
-fail:
-	free(path);
-	free(subPathCpy);
-	return NULL;
 }
 
 BOOL PathMakePathA(LPCSTR path, LPSECURITY_ATTRIBUTES lpAttributes)
@@ -610,8 +582,7 @@ BOOL PathIsRelativeA(LPCSTR pszPath)
 {
 	if (!pszPath)
 		return FALSE;
-
+	return cwk_path_is_relative(pszPath);
-	return pszPath[0] != '/';
 }
 
 BOOL PathIsRelativeW(LPCWSTR pszPath)