/*
 * 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 (c) 2016 by Delphix. All rights reserved.
 */

#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <sys/param.h>

#define MAX_INT_LENGTH 10

static void
usage(char *msg, int exit_value)
{
        (void) fprintf(stderr, "mkfiles basename max_file [min_file]\n");
        (void) fprintf(stderr, "%s\n", msg);
        exit(exit_value);
}

int
main(int argc, char **argv)
{
        unsigned int numfiles = 0;
        unsigned int first_file = 0;
        unsigned int i;
        char buf[MAXPATHLEN];

        if (argc < 3 || argc > 4)
                usage("Invalid number of arguments", -1);

        if (sscanf(argv[2], "%u", &numfiles) != 1)
                usage("Invalid maximum file", -2);

        if (argc == 4 && sscanf(argv[3], "%u", &first_file) != 1)
                usage("Invalid first file", -3);

        if (numfiles < first_file)
                usage("First file larger than last file", -3);

        for (i = first_file; i < first_file + numfiles; i++) {
                int fd;
                (void) snprintf(buf, MAXPATHLEN, "%s%u", argv[1], i);
                if ((fd = open(buf, O_CREAT | O_EXCL, O_RDWR)) == -1) {
                        (void) fprintf(stderr, "Failed to create %s %s\n", buf,
                            strerror(errno));
                        return (-4);
                }
                (void) close(fd);
        }
        return (0);
}