userprintf_rbox.c
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userprintf_rbox.c
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			/*<html><pre> -<a href="qh-user.htm"
			>-------------------------------</a><a name="TOP">-</a>

			userprintf_rbox.c
			qh_fprintf_rbox()

			see README.txt see COPYING.txt for copyright information.

			If you recompile and load this file, then userprintf_rbox.o will not be loaded
			from qhull.a or qhull.lib

			See libqhull.h for data structures, macros, and user-callable functions.
			See user.c for qhull-related, redefinable functions
			see user.h for user-definable constants
			See usermem.c for qh_exit(), qh_free(), and qh_malloc()
			see Qhull.cpp and RboxPoints.cpp for examples.

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

			#include "libqhull.h"

			#include <stdarg.h>
			#include <stdio.h>
			#include <stdlib.h>

			/*-<a href="qh-user.htm#TOC"
			>-------------------------------</a><a name="qh_fprintf_rbox">-</a>

			qh_fprintf_rbox(fp, msgcode, format, list of args )
			print arguments to *fp according to format
			Use qh_fprintf_rbox() for rboxlib.c

			notes:
			same as fprintf()
			fgets() is not trapped like fprintf()
			exit qh_fprintf_rbox via qh_errexit_rbox()
			*/

			void qh_fprintf_rbox(FILE fp, int msgcode, const char fmt, ... ) {
			va_list args;

			if (!fp) {
			qh_fprintf_stderr(6231, "Qhull internal error (userprintf_rbox.c): fp is 0. Wrong qh_fprintf_rbox called.\n");
			qh_errexit_rbox(6231);
			}
			if (msgcode >= MSG_ERROR && msgcode < MSG_STDERR)
			fprintf(fp, "QH%.4d ", msgcode);
			va_start(args, fmt);
			vfprintf(fp, fmt, args);
			va_end(args);
			} /* qh_fprintf_rbox */