Support importing scripts from disk

This is rather brittle right now, but quite interesting anyway.

c/jsc-test.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <JavaScriptCore/JavaScript.h>
	return JSValueMakeUndefined(ctx);
}
JSValueRef function_import_script(JSContextRef ctx, JSObjectRef function, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception) {
	if (argumentCount == 1 && JSValueGetType(ctx, arguments[0]) == kJSTypeString) {
		JSStringRef path_str_ref = JSValueToStringCopy(ctx, arguments[0], NULL);
		char path[100];
		path[0] = '\0';
		JSStringGetUTF8CString(path_str_ref, path, 100);
		FILE *f = fopen(path, "r");
		if (f == NULL) {
			perror("fopen");
			goto err;
		}
		struct stat f_stat;
		if (fstat(fileno(f), &f_stat) < 0) {
			perror("fstat");
			goto err;
		}
		char *buf = malloc(f_stat.st_size * sizeof(char));
		fread(buf, sizeof(char), f_stat.st_size, f);
		if (ferror(f)) {
			perror("fread");
			free(buf);
			goto err;
		}
		JSStringRef script_ref = JSStringCreateWithUTF8CString(buf);
		free(buf);
		JSEvaluateScript(ctx, script_ref, NULL, path_str_ref, 0, NULL);
		JSStringRelease(script_ref);
	}
	return JSValueMakeUndefined(ctx);
err:
	// TODO: Fill exception with error from errno
	return JSValueMakeUndefined(ctx);
}
void register_global_function(JSContextRef ctx, char *name, JSObjectCallAsFunctionCallback handler) {
	JSObjectRef global_obj = JSContextGetGlobalObject(ctx);
	JSObjectRef global_obj = JSContextGetGlobalObject(ctx);
	register_global_function(ctx, "IMPORT_SCRIPT", function_import_script);
	register_global_function(ctx, "CONSOLE_LOG", function_console_log);
	register_global_function(ctx, "CONSOLE_ERROR", function_console_error);