File: writecn.c

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cti-ifhp 2.1.8-2
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/**************************************************************************
 * LPRng IFHP Filter
 * Copyright 1994-1997 Patrick Powell, San Diego, CA <papowell@sdsu.edu>
 *
 * Based on the CTI printer filters.
 *  See COPYRIGHT for details.
 *
 * $Id: writecn.c,v 2.1 1997/01/05 18:41:47 papowell Exp $
 */

#include "portable.h"
#include "common.h"
#include "hp4.h"

int writecn(fd,ptr,nbytes)
int fd;
char *ptr;
int nbytes;
{
	int nleft, nwritten;
	
	/* log(8,"writecn: fd %d, nbytes %d", fd, nbytes ); */
	nleft = nbytes;
	while (nleft > 0){
		nwritten = write( fd, ptr, nleft);
		/* log(8,"writecn: wrote %d", nwritten ); */
		if (nwritten == 0) {
			/* logerr(4,"writecn wrote nothing"); */
		} else if(nwritten < 0) {
			/* logerr(4,"writecn failure"); */
			break;
		}
		nleft -= nwritten;
		ptr += nwritten;
	}
	return(nbytes - nleft);
}