/******************************************************/

/*  tpax: a topological pax implementation            */

/*  Copyright (C) 2020  Z. Gilboa                     */

/*  Released under GPLv2 and GPLv3; see COPYING.TPAX. */

/******************************************************/

#include <stdio.h>

#include <stdarg.h>

#include <stdlib.h>

#include <unistd.h>

#include <errno.h>

int tpax_dprintf(int fd, const char * fmt, ...)

{

	int	ret;

	int	cnt;

	int	size;

	va_list	ap;

	char *	ch;

	char *	buf;

	char	chbuf[2048];

	va_start(ap,fmt);

	size = sizeof(chbuf);

	buf  = ((cnt = vsnprintf(chbuf,size,fmt,ap)) < size)

		? chbuf : malloc(cnt + 1);

	va_end(ap);

	if (buf == chbuf) {

		(void)0;

	} else if (buf) {

		va_start(ap,fmt);

		vsprintf(buf,fmt,ap);

		va_end(ap);

	} else {

		return -1;

	}

	ret = 0;

	ch  = buf;

	for (; cnt && ret>=0; ) {

		ret = write(fd,ch,cnt);

		while ((ret < 0) && (errno == EINTR))

			ret = write(fd,ch,cnt);

		ch  += ret;

		cnt -= ret;

	}

	ret = (ret < 0) ? -1 : ch - buf;

	if (buf != chbuf)

		free(buf);

	return ret;

}