(libc.info.gz) Customizing Printf

 
 12.13 Customizing `printf'
 ==========================
 
 The GNU C library lets you define your own custom conversion specifiers
 for `printf' template strings, to teach `printf' clever ways to print
 the important data structures of your program.
 
    The way you do this is by registering the conversion with the
 function `register_printf_function'; see  Registering New
 Conversions.  One of the arguments you pass to this function is a
 pointer to a handler function that produces the actual output; see
  Defining the Output Handler, for information on how to write
 this function.
 
    You can also install a function that just returns information about
 the number and type of arguments expected by the conversion specifier.
  Parsing a Template String, for information about this.
 
    The facilities of this section are declared in the header file
 `printf.h'.

 
* Registering New Conversions         Using `register_printf_function'
                                          to register a new output conversion.
* Conversion Specifier Options        The handler must be able to get
                                          the options specified in the
                                          template when it is called.
* Defining the Output Handler         Defining the handler and arginfo
                                          functions that are passed as arguments
                                          to `register_printf_function'.
* Printf Extension Example            How to define a `printf'
                                          handler function.
* Predefined Printf Handlers          Predefined `printf' handlers.
 
    *Portability Note:* The ability to extend the syntax of `printf'
 template strings is a GNU extension.  ISO standard C has nothing
 similar.

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