S-Lang is a C programmer's library that includes routines for the rapid development of sophisticated, user friendly, multi-platform applications. The S-Lang library includes the following: - Low level tty input routines for reading single characters at a time, as well as low-level terminal-independent routines for manipulating the display of a terminal. - Keymap routines for defining keys and manipulating multiple keymaps. - High level screen management routines for manipulating both monochrome and color terminals. These routines are very efficient. - Routines for reading single line input with line editing and recall capabilities. - Searching functions: both ordinary searches and regular expression searches. - An embedded stack-based language interpreter with a C-like syntax. - A malloc debugging package