OK mandoc, how'd that happen?

gistfile1.txt

_cbprintf(3)               Library Functions Manual               _cbprintf(3)

NNAAMMEE
     __ccbbpprriinnttff, __vvccbbpprriinnttff, __ccbbwwpprriinnttff, __vvccbbwwpprriinnttff -- formatted output
     conversion by callback

SSYYNNOOPPSSIISS
     ##iinncclluuddee <<ssttddiioo..hh>>

     iinntt __ccbbpprriinnttff(_v_o_i_d _*_p, _i_n_t _(_*_c_b_)_(_v_o_i_d _*_p_, _c_o_n_s_t _c_h_a_r    _*_b_u_f_, _i_n_t _s_i_z_e_),
         _c_o_n_s_t _c_h_a_r _*_f_m_t, _._._.);

     iinntt __vvccbbpprriinnttff(_v_o_i_d _*_p, _i_n_t _(_*_c_b_)_(_v_o_i_d _*_p_, _c_o_n_s_t _c_h_a_r    _*_b_u_f_, _i_n_t _s_i_z_e_),
         _c_o_n_s_t _c_h_a_r _*_f_m_t, _v_a___l_i_s_t _a_p);

     ##iinncclluuddee <<wwcchhaarr..hh>>

     iinntt __ccbbwwpprriinnttff(_v_o_i_d _*_p, _i_n_t _(_*_c_b_)_(_v_o_i_d _*_p_, _c_o_n_s_t _w_c_h_a_r___t _*_b_u_f_, _i_n_t _s_i_z_e_),
         _c_o_n_s_t _w_c_h_a_r___t _*_f_m_t, _._._.);

     iinntt __vvccbbwwpprriinnttff(_v_o_i_d _*_p,
         _i_n_t _(_*_c_b_)_(_v_o_i_d _*_p_, _c_o_n_s_t _w_c_h_a_r___t _*_b_u_f_, _i_n_t _s_i_z_e_), _c_o_n_s_t _w_c_h_a_r___t _*_f_m_t,
         _v_a___l_i_s_t _a_p);

DDEESSCCRRIIPPTTIIOONN
     These functions permit the pprriinnttff() string formatting functionality to be
     reused outside the C standard library, without the limitations of using
     the sspprriinnttff() function for this process; for example, the requirement to
     allocate large quantities of RAM or truncate when formatting produces a
     large string.

     These functions shall exhibit the same behaviour and conversion
     specifiers as the printf(3) function, except they shall perform their
     output by calling the _c_b callback, passing the characters to be output as
     the _b_u_f parameter, and the count of such characters as _s_i_z_e.  The
     implementation is permitted to invoke _c_b as many or as few times as it
     desires (i.e. it may perform as much or as little buffering internally as
     it desires), except that, excluding the case in which formatting has
     produced a zero length string. During all invocations, the callback will
     be passed as _p the same value as was passed to the function.

     The callback may return a negative value in order to terminate processing
     (in which case the function will also return a negative value).

RREETTUURRNN VVAALLUUEESS
     The functions will return the sum of the return values of the callback on
     success, a negative value otherwise.

EERRRROORRSS
     No errors are defined

SSEEEE AALLSSOO
     printf(3)

RRAATTIIOONNAALLEE
     Sensible implementations of the ISO C standard library implement an
     analogous system internally, permitting them to share their
     implementation of formatting between printf(3) and sprintf(3).
     Therefore, implementing a callback based variant is not of substantial
     complexity.

     These functions permit the reuse of this functionality by applications
     and libraries (for example, a logging library) without the need to
     reimplement it, and without the limitations imposed by snprintf(3).

HHIISSTTOORRYY
     This nonstandard extension was first defined by PDCLib.

Darwin 14.0.0                   August 11, 2014                  Darwin 14.0.0