MKD_CALLBACKS(3)					   BSD Library Functions Manual 					  MKD_CALLBACKS(3)

NAME

     mkd_callbacks -- functions that modify link targets

LIBRARY

     Markdown (libmarkdown, -lmarkdown)

SYNOPSIS

     #include <mkdio.h>

     char*
     (*mkd_callback_t)(const char*, const int, void*);

     void
     (*mkd_free_t)(char *, void*);

     void
     mkd_e_url(MMIOT *document, mkd_callback_t edit);

     void
     mkd_e_flags(MMIOT *document, mkd_callback_t edit);

     void
     mkd_e_free(MMIOT *document, mkd_free_t dealloc);

     void
     mkd_e_data(MMIOT *document, void *data);

DESCRIPTION

     Discount provides a small set of data access functions to let a library user modify the targets given in a `[]' link, and to add additional
     flags to the generated link.

     The data access functions are passed a character pointer to the url being generated, the size of the url, and a data pointer pointing to a
     user data area (set by the mkd_e_data() function.)     After the callback function is called (either mkd_e_url() or mkd_e_flags()) the data
     freeing function (if supplied) is called and passed the character pointer and user data pointer.

EXAMPLE

     The mkd_basename() function (in the module basename.c) is implemented by means of mkd callbacks;  it modifies urls that start with a `/' so
     that they begin with a user-supplied url base by allocating a new string and filling it with the base + the url.  Discount plugs that url in
     in place of the original, then calls the basename free function (it only does this when mkd_e_url() or mkd_e_flags() returns nonzero) to
     deallocate this memory.

     Note that only one level of callbacks are supported; if you wish to do multiple callbacks, you need to write your own code to handle them
     all.

SEE ALSO

     markdown(1), markdown(3), mkd-line(3), markdown(7), mkd-extensions(7), mmap(2).

     basename.c

     http://daringfireball.net/projects/markdown/syntax

BUGS

     Error handling is minimal at best.

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