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mktemp(1): add suffix support for compatibility with the GNU version
It is now possible to use templates where the Xs are not at the
end, like "foo.XXXXXX.bar".  If there are multiple runs of Xs,
the last one is used.  OK deraadt@

/*	$OpenBSD: mktemp.c,v 1.26 2024/03/01 21:50:40 millert Exp $	*/

/*
 * Copyright (c) 1996, 1997, 2001-2003, 2013
 *	Todd C. Miller <millert@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.
 */

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

__dead void usage(void);
__dead void fatal(const char *, ...) __attribute__((__format__(printf, 1, 2)));
__dead void fatalx(const char *, ...) __attribute__((__format__(printf, 1, 2)));

static int quiet;

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

	if (pledge("stdio rpath wpath cpath", NULL) == -1)
		err(1, "pledge");

	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();
	}

	base = strrchr(template, '/');
	if (base != NULL)
		base++;
	else
		base = template;
	len = strlen(base);
	if (len > 0 && base[len - 1] != 'X') {
		/* Check for suffix, e.g. /tmp/XXXXXX.foo in last component. */
		for (suffixlen = 0; suffixlen < len; suffixlen++) {
			if (base[len - suffixlen - 1] == 'X')
				break;
		}
	}
	if (len - suffixlen < 6 ||
	    strncmp(&base[len - suffixlen - 6], "XXXXXX", 6)) {
		fatalx("insufficient number of Xs in template `%s'",
		    template);
	}
	if (tflag) {
		if (base != template) {
			fatalx("template must not contain directory "
			    "separators in -t mode");
		}

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

		if (asprintf(&tempfile, "%.*s/%s", (int)len, prefix, template) == -1)
			tempfile = NULL;
	} else
		tempfile = strdup(template);

	if (tempfile == NULL)
		fatalx("cannot allocate memory");

	if (makedir) {
		if (mkdtemps(tempfile, suffixlen) == NULL)
			fatal("cannot make temp dir %s", tempfile);
		if (uflag)
			(void)rmdir(tempfile);
	} else {
		if ((fd = mkstemps(tempfile, suffixlen)) == -1)
			fatal("cannot make temp file %s", tempfile);
		(void)close(fd);
		if (uflag)
			(void)unlink(tempfile);
	}

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

	return EXIT_SUCCESS;
}

__dead void
fatal(const char *fmt, ...)
{
	if (!quiet) {
		va_list ap;

		va_start(ap, fmt);
		vwarn(fmt, ap);
		va_end(ap);
	}
	exit(EXIT_FAILURE);
}

__dead void
fatalx(const char *fmt, ...)
{
	if (!quiet) {
		va_list ap;

		va_start(ap, fmt);
		vwarnx(fmt, ap);
		va_end(ap);
	}
	exit(EXIT_FAILURE);
}

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

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