/*************************************************************************\
*                  Copyright (C) Michael Kerrisk, 2026.                   *
*                                                                         *
* This program is free software. You may use, modify, and redistribute it *
* under the terms of the GNU General Public License as published by the   *
* Free Software Foundation, either version 3 or (at your option) any      *
* later version. This program is distributed without any warranty.  See   *
* the file COPYING.gpl-v3 for details.                                    *
\*************************************************************************/

#include <sys/mount.h>
#include "tlpi_hdr.h"

static void
usageError(const char *progName, const char *msg)
{
    if (msg != NULL)
        fprintf(stderr, "%s", msg);

    fprintf(stderr, "Usage: %s [options] source target\n\n", progName);
    fprintf(stderr, "Available options:\n");
#define fpe(str) fprintf(stderr, "    " str)    /* Shorter! */
    fpe("-t fstype        [e.g., 'ext2' or 'reiserfs']\n");
    fpe("-o data          [file system-dependent options,\n");
    fpe("                 e.g., 'bsdgroups' for ext2]\n");
    fpe("-f mountflags    can include any of:\n");
#define fpe2(str) fprintf(stderr, "            " str)
    fpe2("b - MS_BIND         create a bind mount\n");
    fpe2("d - MS_DIRSYNC      synchronous directory updates\n");
    fpe2("l - MS_MANDLOCK     permit mandatory locking\n");
    fpe2("m - MS_MOVE         atomically move subtree\n");
    fpe2("A - MS_NOATIME      don't update atime (last access time)\n");
    fpe2("V - MS_NODEV        don't permit device access\n");
    fpe2("D - MS_NODIRATIME   don't update atime on directories\n");
    fpe2("E - MS_NOEXEC       don't allow executables\n");
    fpe2("S - MS_NOSUID       disable set-user/group-ID programs\n");
    fpe2("r - MS_RDONLY       read-only mount\n");
    fpe2("c - MS_REC          recursive mount\n");
    fpe2("R - MS_REMOUNT      remount\n");
    fpe2("s - MS_SYNCHRONOUS  make writes synchronous\n");
    exit(EXIT_FAILURE);
}

int
main(int argc, char *argv[])
{
    unsigned long flags;
    char *data, *fstype;
    int j, opt;

    flags = 0;
    data = NULL;
    fstype = NULL;

    while ((opt = getopt(argc, argv, "o:t:f:")) != -1) {
        switch (opt) {
        case 'o':
            data = optarg;
            break;

        case 't':
            fstype = optarg;
            break;

        case 'f':
            for (j = 0; j < (int) strlen(optarg); j++) {
                switch (optarg[j]) {
                case 'b': flags |= MS_BIND;             break;
                case 'd': flags |= MS_DIRSYNC;          break;
                case 'l': flags |= MS_MANDLOCK;         break;
                case 'm': flags |= MS_MOVE;             break;
                case 'A': flags |= MS_NOATIME;          break;
                case 'V': flags |= MS_NODEV;            break;
                case 'D': flags |= MS_NODIRATIME;       break;
                case 'E': flags |= MS_NOEXEC;           break;
                case 'S': flags |= MS_NOSUID;           break;
                case 'r': flags |= MS_RDONLY;           break;
                case 'c': flags |= MS_REC;              break;
                case 'R': flags |= MS_REMOUNT;          break;
                case 's': flags |= MS_SYNCHRONOUS;      break;
                default:  usageError(argv[0], NULL);
                }
            }
            break;

        default:
            usageError(argv[0], NULL);
        }
    }

    if (argc != optind + 2)
        usageError(argv[0], "Wrong number of arguments\n");

    if (mount(argv[optind], argv[optind + 1], fstype, flags, data) == -1)
        errExit("mount");

    exit(EXIT_SUCCESS);
}