file_util: Add platform-specific slash option to SanitizePath

src/common/file_util.cpp

@@ -884,11 +884,21 @@ std::string_view RemoveTrailingSlash(std::string_view path) {
     return path;
 }
 
-std::string SanitizePath(std::string_view path_) {
+std::string SanitizePath(std::string_view path_, bool with_platform_slashes) {
     std::string path(path_);
-    std::replace(path.begin(), path.end(), '\\', '/');
+    char type1 = '\\';
+    char type2 = '/';
+
+    if (with_platform_slashes) {
+#ifdef _WIN32
+        type1 = '/';
+        type2 = '\\';
+#endif
+    }
+
+    std::replace(path.begin(), path.end(), type1, type2);
     path.erase(std::unique(path.begin(), path.end(),
-                           [](char c1, char c2) { return c1 == '/' && c2 == '/'; }),
+                           [type2](char c1, char c2) { return c1 == type2 && c2 == type2; }),
                path.end());
     return std::string(RemoveTrailingSlash(path));
 }

src/common/file_util.h

@@ -182,8 +182,9 @@ std::vector<T> SliceVector(const std::vector<T>& vector, size_t first, size_t la
     return std::vector<T>(vector.begin() + first, vector.begin() + first + last);
 }
 
-// Removes trailing slash, makes all '\\' into '/', and removes duplicate '/'.
-std::string SanitizePath(std::string_view path);
+// Removes trailing slash, makes all '\\' into '/', and removes duplicate '/'. Makes '/' into '\\'
+// if windows and with_platform_slashes is true.
+std::string SanitizePath(std::string_view path, bool with_platform_slashes = false);
 
 // simple wrapper for cstdlib file functions to
 // hopefully will make error checking easier