Renamed drive system

c-api/drive_system_h.md

@@ -0,0 +1,54 @@
+
+# toy_drive_system.h
+
+When accessing the file system through toy (such as with the runner library), it's best practice to utilize Toy's built-in drive system - this system (tries to) prevent malicious accessing of files outside of the designated folders. It does this by causing an error when a script tries to access a parent directory.
+
+To use the drive system, first you must designate specific folders which can be accessed, like so:
+
+```c
+#include "toy_drive_system.h"
+
+int main(int argc, char* argv[]) {
+	//the drive system uses a LiteralDictionary, which must be initialized with this
+	Toy_initDriveSystem();
+
+	Toy_setDrivePath("scripts", "assets/scripts");
+	Toy_setDrivePath("sprites", "assets/sprites");
+	Toy_setDrivePath("fonts", "assets/fonts");
+
+	//TODO: do you stuff here
+
+	//clean up the drive dictionary when you're done
+	Toy_freeDriveSystem();
+
+	return 0;
+}
+```
+
+This utility is intended mainly for libraries to use - as such, the core of Toy does not utilize it.
+
+### Implementation Details
+
+The drive system uses a Toy's Dictionary structure to store the mappings between keys and values - this dictionary object is a static global which persists for the lifetime of the program.
+
+## Defined Functions
+
+### void Toy_initDriveSystem()
+
+This function initializes the drive system.
+
+### void Toy_freeDriveSystem()
+
+This function cleans up after the drive system is no longer needed.
+
+### void Toy_setDrivePath(char* drive, char* path)
+
+This function sets a key-value pair in the drive system. It uses C strings, since its intended to be called directly from `main()`.
+
+### Toy_Literal Toy_getDrivePathLiteral(Toy_Interpreter* interpreter, Toy_Literal* drivePathLiteral)
+
+This function, when given a string literal of the correct format, will return a new string literal containing the relative filepath to a specified file.
+
+The correct format is `drive:/path/to/filename`, where `drive` is a drive that was specified with `Toy_setDrivePath()`.
+
+On failure, this function returns a null literal.