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rcsid[] and sccsid[] and copyright[] are essentially unmaintained (and
unmaintainable).  these days, people use source.  these id's do not provide
any benefit, and do hurt the small install media
(the 33,000 line diff is essentially mechanical)
ok with the idea millert, ok dms

/*	$OpenBSD: mktemp.c,v 1.15 2009/10/27 23:59:40 deraadt Exp $	*/

/*
 * Copyright (c) 1996, 1997, 2001 Todd C. Miller <Todd.Miller@courtesan.com>
 *
 * 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.
 */

#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <err.h>

__dead void usage(void);

int
main(int argc, char *argv[])
{
	int ch, fd, uflag = 0, quiet = 0, tflag = 0, makedir = 0;
	char *cp, *template, *tempfile, *prefix = _PATH_TMP;
	int plen;

	while ((ch = getopt(argc, argv, "dp:qtu")) != -1)
		switch(ch) {
		case 'd':
			makedir = 1;
			break;
		case 'p':
			prefix = optarg;
			tflag = 1;
			break;
		case 'q':
			quiet = 1;
			break;
		case 't':
			tflag = 1;
			break;
		case 'u':
			uflag = 1;
			break;
		default:
			usage();
	}

	/* If no template specified use a default one (implies -t mode) */
	switch (argc - optind) {
	case 1:
		template = argv[optind];
		break;
	case 0:
		template = "tmp.XXXXXXXXXX";
		tflag = 1;
		break;
	default:
		usage();
	}

	if (tflag) {
		if (strchr(template, '/')) {
			if (!quiet)
				warnx("template must not contain directory "
				    "separators in -t mode");
			exit(1);
		}

		cp = getenv("TMPDIR");
		if (cp != NULL && *cp != '\0')
			prefix = cp;
		plen = strlen(prefix);
		while (plen != 0 && prefix[plen - 1] == '/')
			plen--;

		if (asprintf(&tempfile, "%.*s/%s", plen, prefix, template) < 0)
			tempfile = NULL;
	} else
		tempfile = strdup(template);
	if (tempfile == NULL) {
		if (!quiet)
			warnx("cannot allocate memory");
		exit(1);
	}

	if (makedir) {
		if (mkdtemp(tempfile) == NULL) {
			if (!quiet)
				warn("cannot make temp dir %s", tempfile);
			exit(1);
		}

		if (uflag)
			(void)rmdir(tempfile);
	} else {
		if ((fd = mkstemp(tempfile)) < 0) {
			if (!quiet)
				warn("cannot make temp file %s", tempfile);
			exit(1);
		}
		(void)close(fd);

		if (uflag)
			(void)unlink(tempfile);
	}

	(void)puts(tempfile);
	free(tempfile);

	exit(0);
}

__dead void
usage(void)
{
	extern char *__progname;

	(void)fprintf(stderr,
	    "usage: %s [-dqtu] [-p directory] [template]\n", __progname);
	exit(1);
}