dprintf.c

/*
 * Copyright (c) 2021 Jan Klemkow <j.klemkow@wemelug.de>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#ifdef __sun__
#include <stdio.h>
#include <stdarg.h>
#include <unistd.h>

void
dprintf(int fd, const char *fmt, ...)
{
	char buf[BUFSIZ];
	va_list ap;
	int len;

	va_start(ap, fmt);
	len = vsnprintf(buf, sizeof buf, fmt, ap);
	va_end(ap);

	if (len >= (int)sizeof buf)
		len = sizeof buf;

	if (write(fd, buf, len) == -1)
		err(EXIT_FAILURE, "write");
}
#endif