//// Dis VM// File: sys_utils.h// Author: arr// #ifndef _DISVM_SRC_VM_SYS_SYS_UTILS_H_#define _DISVM_SRC_VM_SYS_SYS_UTILS_H_ #include <vector>#include <ios>#include <memory>#include <disvm.h>#include <utils.h>#include "fd_types.h" namespace disvm{    namespace runtime    {        namespace sys        {            // Prints the format and arguments to the supplied buffer.            // Returns the number of bytes written.            word_t printf_to_buffer(                disvm::vm_t &vm,                const vm_string_t &msg_fmt,                byte_t *msg_args,                pointer_t base,                const std::size_t buffer_size,                char *buffer);             // Prints the format and arguments to the supplied dynamic buffer.            // Returns the number of bytes written.            word_t printf_to_dynamic_buffer(                disvm::vm_t &vm,                const vm_string_t &msg_fmt,                byte_t *msg_args,                pointer_t base,                std::vector<char> &buffer);             const word_t vm_invalid_fd = -1;             // No reference count updates are performed on supplied vm_fd_t instance.            word_t create_fd_record(vm_fd_t *vm_fd);             // Returns 'false' if the supplied file descriptor is invalid, otherwise 'true'.            // No reference count updates are performed on supplied vm_fd_t instance.            bool try_update_fd_record(word_t fd, vm_fd_t *vm_fd);             // Returns null if the record does not exist.            // If the record does exist, the reference count is incremented prior            // to the instance being returned.            vm_fd_t * fetch_fd_record(word_t fd);             // The associated vm_fd_t instance reference count is decremented            // and will be deleted once all references are released.            void drop_fd_record(word_t fd);        }    }} #endif // _DISVM_SRC_VM_SYS_SYS_UTILS_H_