RadiancePmap/duphead.c
fab831a1d6fdmaster

duphead.c
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			#ifndef lint
			static const char RCSid[] = "$Id: duphead.c,v 2.7 2003/10/22 02:06:35 greg Exp $";
			#endif
			/*
			* Duplicate header on stdout.
			*
			* Externals declared in ray.h
			*/

			#include "copyright.h"

			#include "platform.h"
			#include "standard.h"
			#include "paths.h"


			int headismine = 1; /* true if header file belongs to me */

			static char headfname = NULL; / temp file name */
			static FILE headfp = NULL; / temp file pointer */


			void
			headclean() /* remove header temp file (if one) */
			{
			if (headfname == NULL)
			return;
			if (headfp != NULL)
			fclose(headfp);
			if (headismine)
			unlink(headfname);
			}


			void
			openheader() /* save standard output to header file */
			{
			static char template[] = TEMPLATE;

			headfname = mktemp(template);
			if (freopen(headfname, "w", stdout) == NULL) {
			sprintf(errmsg, "cannot open header file \"%s\"", headfname);
			error(SYSTEM, errmsg);
			}
			}


			void
			dupheader() /* repeat header on standard output */
			{
			register int c;

			if (headfp == NULL) {
			if ((headfp = fopen(headfname, "r")) == NULL)
			error(SYSTEM, "error reopening header file");
			SET_FILE_BINARY(headfp);
			} else if (fseek(headfp, 0L, 0) < 0)
			error(SYSTEM, "seek error on header file");
			while ((c = getc(headfp)) != EOF)
			putchar(c);
			}