1 files changed, 117 insertions, 0 deletions
diff --git a/indra/llcommon/scriptcommand.cpp b/indra/llcommon/scriptcommand.cpp
new file mode 100644
index 0000000000..79afbc2063
--- /dev/null
+++ b/indra/llcommon/scriptcommand.cpp
@@ -0,0 +1,117 @@
+/**
+ * @file   scriptcommand.cpp
+ * @author Nat Goodspeed
+ * @date   2024-09-16
+ * @brief  Implementation for scriptcommand.
+ *
+ * $LicenseInfo:firstyear=2024&license=viewerlgpl$
+ * Copyright (c) 2024, Linden Research, Inc.
+ * $/LicenseInfo$
+ */
+
+// Precompiled header
+#include "linden_common.h"
+// associated header
+#include "scriptcommand.h"
+// STL headers
+// std headers
+#include <sstream>
+// external library headers
+// other Linden headers
+#include "fsyspath.h"
+#include "llerror.h"
+#include "llsdutil.h"
+#include "llstring.h"
+#include "stringize.h"
+
+ScriptCommand::ScriptCommand(const std::string& command, const LLSD& path,
+                             const std::string& base)
+{
+    fsyspath basepath(base);
+    // Use LLStringUtil::getTokens() to parse the script command line
+    args = LLStringUtil::getTokens(command,
+                                   " \t\r\n", // drop_delims
+                                   "",        // no keep_delims
+                                   "\"'",     // either kind of quotes
+                                   "\\");     // backslash escape
+    // search for args[0] on paths
+    if (search(args[0], path, basepath))
+    {
+        // The first token is in fact the script filename. Now that we've
+        // found the script file, we've consumed that token. The rest are
+        // command-line arguments.
+        args.erase(args.begin());
+        return;
+    }
+
+    // Parsing the command line produced a script file path we can't find.
+    // Maybe that's because there are spaces in the original pathname that
+    // were neither quoted nor escaped? See if we can find the whole original
+    // command line string.
+    if (search(command, path, basepath))
+    {
+        // Here we found script, using the whole input command line as its
+        // pathname. Discard any parts of it we mistook for command-line
+        // arguments.
+        args.clear();
+        return;
+    }
+
+    // Couldn't find the script either way. Is it because we can't even check
+    // existence?
+    if (! mError.empty())
+    {
+        return;
+    }
+
+    // No, existence check works, we just can't find the script.
+    std::ostringstream msgstream;
+    msgstream << "Can't find script file " << std::quoted(args[0]);
+    if (command != args[0])
+    {
+        msgstream << " or " << std::quoted(command);
+    }
+    if (path.size() > 0)
+    {
+        msgstream << " on " << path;
+    }
+    if (! base.empty())
+    {
+        msgstream << " relative to " << base;
+    }
+    mError = msgstream.str();
+    LL_WARNS("Lua") << mError << LL_ENDL;
+}
+
+bool ScriptCommand::search(const fsyspath& script, const LLSD& paths, const fsyspath& base)
+{
+    for (const auto& path : llsd::inArray(paths))
+    {
+        // If a path is already absolute, (otherpath / path) preserves it.
+        // Explicitly instantiate fsyspath for every string conversion to
+        // properly convert UTF-8 filename strings on Windows.
+        fsyspath absscript{ base / fsyspath(path.asString()) / script };
+        bool exists;
+        try
+        {
+            exists = std::filesystem::exists(absscript);
+        }
+        catch (const std::filesystem::filesystem_error& exc)
+        {
+            mError = stringize("Can't check existence: ", exc.what());
+            LL_WARNS("Lua") << mError << LL_ENDL;
+            return false;
+        }
+        if (exists)
+        {
+            this->script = absscript.string();
+            return true;
+        }
+    }
+    return false;
+}
+
+std::string ScriptCommand::error() const
+{
+    return mError;
+}