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Compat glue needed for Solaris 9 and 10.

Thanks to Sevan Janiyan <venture37 at geeklan dot co dot uk> for
reporting the Solaris 10 issues, to Jan Holzhueter <jh at opencsw
dot org> for some additional insight, and to OpenCSW in general for
providing me with a Solaris 9/10/11 testing environment.

#include "config.h"

#if HAVE_VASPRINTF

int dummy;

#else

/*	$Id: compat_vasprintf.c,v 1.1 2015/03/19 14:57:29 schwarze Exp $	*/
/*
 * Copyright (c) 2015 Ingo Schwarze <schwarze@openbsd.org>
 *
 * 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.
 *
 * This fallback implementation is not efficient:
 * It does the formatting twice.
 * Short of fiddling with the unknown internals of the system's
 * printf(3) or completely reimplementing printf(3), i can't think
 * of another portable solution.
 */

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

int
vasprintf(char **ret, const char *format, va_list ap)
{
	char	 buf[2];
	int	 sz;

	if ((sz = vsnprintf(buf, sizeof(buf), format, ap)) != -1 &&
	    (*ret = malloc(sz + 1)) != NULL) {
		if (vsnprintf(*ret, sz + 1, format, ap) == sz)
			return(sz);
		free(*ret);
	}
	*ret = NULL;
	return(-1);
}

#endif