user redefinable functions -- qh_exit, qh_free, and qh_malloc

   See README.txt.

   If you redefine one of these functions you must redefine all of them.
   If you recompile and load this file, then usermem.o will not be loaded
   from qhull.a or qhull.lib

   See libqhull_r.h for data structures, macros, and user-callable functions.
   See user_r.c for qhull-related, redefinable functions
   see user_r.h for user-definable constants
   See userprintf_r.c for qh_fprintf and userprintf_rbox_r.c for qh_fprintf_rbox

   Please report any errors that you fix to qhull@qhull.org

#include "libqhull_r.h"



  qh_exit( exitcode )
    exit program
    the exitcode must be 255 or less.  Zero indicates success.
    Note: Exit status ('$?') in bash reports 256 as 0

    qh_exit() is called when qh_errexit() and longjmp() are not available.

    This is the only use of exit() in Qhull
    To replace qh_exit with 'throw', see libqhullcpp/usermem_r-cpp.cpp
void qh_exit(int exitcode) {
} /* exit */


  qh_fprintf_stderr( msgcode, format, list of args )
    fprintf to stderr with msgcode (non-zero)

    qh_fprintf_stderr() is called when qh.ferr is not defined, usually due to an initialization error
    if msgcode is a MSG_ERROR (6000), caller should set qh.last_errcode (like qh_fprintf) or variable 'last_errcode'
    It is typically followed by qh_errexit().

    Redefine this function to avoid using stderr

    Use qh_fprintf [userprintf_r.c] for normal printing
void qh_fprintf_stderr(int msgcode, const char *fmt, ... ) {
    va_list args;

    va_start(args, fmt);
      fprintf(stderr, "QH%.4d ", msgcode);
    vfprintf(stderr, fmt, args);
} /* fprintf_stderr */


  qh_free(qh, mem )
    free memory

    same as free()
    No calls to qh_errexit() 
void qh_free(void *mem) {
} /* free */


    qh_malloc( mem )
      allocate memory

      same as malloc()
void *qh_malloc(size_t size) {
    return malloc(size);
} /* malloc */