/*
 * This file and its contents are supplied under the terms of the
 * Common Development and Distribution License ("CDDL"), version 1.0.
 * You may only use this file in accordance with the terms of version
 * 1.0 of the CDDL.
 *
 * A full copy of the text of the CDDL should have accompanied this
 * source.  A copy of the CDDL is also available via the Internet at
 * http://www.illumos.org/license/CDDL.
 */

/*
 * Copyright 2020 Oxide Computer Company
 */

/*
 * Regression test for 12768 '12392 regressed ftello64 behavior'. The heart of
 * the problem was a bad cast that resulted in us not properly transmitting that
 * size.
 */

#include <stdio.h>
#include <err.h>
#include <stdlib.h>
#include <sys/sysmacros.h>

int
main(void)
{
        FILE *f;
        size_t i;
        int ret = EXIT_SUCCESS;
        static off_t offsets[] = {
                23,
                0xa0000,        /* 64 KiB */
                0x100000,       /* 1 MiB */
                0x7fffffffULL,  /* 2 GiB - 1 */
                0xc0000000ULL,  /* 3 GiB */
                0x200005432ULL  /* 8 GiB + misc */
        };

        f = tmpfile();
        if (f == NULL) {
                err(EXIT_FAILURE, "TEST FAILED: failed to create "
                    "temporary file");
        }

        for (i = 0; i < ARRAY_SIZE(offsets); i++) {
                off_t ftret;

                if (fseeko(f, offsets[i], SEEK_SET) != 0) {
                        warn("TEST FAILED: failed to seek to %lld",
                            (long long)offsets[i]);
                        ret = EXIT_FAILURE;
                }

                ftret = ftello(f);
                if (ftret == -1) {
                        warn("TEST FAILED: failed to get stream position at "
                            "%lld", (long long)offsets[i]);
                        ret = EXIT_FAILURE;
                }

                if (ftret != offsets[i]) {
                        warnx("TEST FAILED: stream position mismatch: expected "
                            "%lld, found %lld", (long long)offsets[i],
                            (long long)ftret);
                        ret = EXIT_FAILURE;
                }
        }

        return (ret);
}