/*
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright © 2024 Mostafa Salmaan
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above
 *    copyright notice, this list of conditions and the following
 *    disclaimer in the documentation and/or other materials provided
 *    with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */
/* P_tmpdir and tmpnam() are gated behind feature macros on hosted (glibc) builds */
#define _GNU_SOURCE
#include <stdio.h>
#include <string.h>

int
main(void)
{
    char generate[2][L_tmpnam];

    // Generate two temporary files
    if (tmpnam(generate[0]) == NULL) {
        printf("tmpnam(generate[0]) failed\n");
        return -1;
    }
    if (tmpnam(generate[1]) == NULL) {
        printf("tmpnam(generate[1]) failed\n");
        return -1;
    }

    // Generated names must live under P_tmpdir
    if (sizeof(P_tmpdir) > 1 && strncmp(generate[0], P_tmpdir, sizeof(P_tmpdir) - 1) != 0) {
        printf("tmpnam \"%s\" not under P_tmpdir \"%s\"\n", generate[0], P_tmpdir);
        return -1;
    }

    // Check if the two file names are the same
    if (strcmp(tmpnam(generate[0]), generate[1]) == 0) {
        // The same file name
        printf("tmpnam returns identical names \"%s\"\n", generate[0]);
        return -1;
    } else {
        // Different file names
        printf("tmpnames generated \"%s\" and \"%s\"\n", generate[0], generate[1]);
        return 0;
    }
}
