/*
 * 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 2017 Nexenta Systems, Inc.  All rights reserved.
 */

/*
 * Print a packed nvlist from a file.
 */

#include <stdio.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "libnvpair.h"

char buf[65536];

void
dumpit(FILE *fp)
{
        struct stat st;
        size_t flen;
        int rlen;
        nvlist_t *nvl = NULL;
        int err;

        if (fstat(fileno(fp), &st) < 0) {
                perror("fstat");
                return;
        }
        flen = (size_t)st.st_size;
        if (flen > sizeof (buf)) {
                (void) printf("File too large\n");
                return;
        }
        rlen = fread(buf, 1, flen, fp);
        if (rlen <= 0) {
                perror("fread");
                return;
        }
        if (rlen != flen) {
                (void) printf("Short read %d %d \n", rlen, flen);
                return;
        }

        err = nvlist_unpack(buf, flen, &nvl, 0);
        if (err != 0) {
                (void) printf("nvlist_unpack, err=%d\n", err);
                return;
        }

        nvlist_print(stdout, nvl);
        nvlist_free(nvl);
}

int
main(int argc, char **argv)
{
        FILE *fp;
        int i;

        if (argc < 2) {
                (void) fprintf(stderr, "usage: %s {filename} [filename2...]\n",
                    argv[0]);
                return (1);
        }
        for (i = 1; i < argc; i++) {
                fp = fopen(argv[i], "r");
                if (fp == NULL) {
                        perror(argv[i]);
                        return (1);
                }
                (void) printf("%s:\n", argv[i]);
                dumpit(fp);
                (void) fclose(fp);
        }
        return (0);
}