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Readline provides many functions for manipulating the text of the line, but it isn't possible to anticipate the needs of all programs. This section describes the various functions and variables defined within the Readline library which allow a user program to add customized functionality to Readline.
Before declaring any functions that customize Readline's behavior, or
using any functionality Readline provides in other code, an
application writer should include the file
in any file that uses Readline's features. Since some of the definitions
readline.h use the
stdio library, the file
<stdio.h> should be included before
2.2.1 Readline Typedefs C declarations to make code readable. 2.2.2 Writing a New Function Variables and calling conventions.