mkd_callbacks(3) functions that modify link targets


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Fd #include <mkdio.h> Ft char* Fn (*mkd_callback_t) const char* const int void* Ft void Fn (*mkd_free_t) char * void* Ft void Fn mkd_e_url MMIOT *document mkd_callback_t edit Ft void Fn mkd_e_flags MMIOT *document mkd_callback_t edit Ft void Fn mkd_e_free MMIOT *document mkd_free_t dealloc Ft void Fn mkd_e_data MMIOT *document void *data


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 Fn mkd_e_data function.) After the callback function is called (either Fn mkd_e_url or Fn mkd_e_flags ) the data freeing function (if supplied) is called and passed the character pointer and user data pointer.


The Fn 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 Fn mkd_e_url or Fn 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.


Error handling is minimal at best.