/*
 * lsvfs - list loaded VFSes
 * Garrett A. Wollman, September 1994
 * This file is in the public domain.
 *
 * $FreeBSD: src/usr.bin/lsvfs/lsvfs.c,v 1.13.2.1 2001/07/30 09:59:16 dd Exp $
 */

#include <sys/param.h>
#include <sys/mount.h>

#include <err.h>
#include <stdio.h>
#include <string.h>

#define FMT     "%-32.32s 0x%08x %5d  %s\n"
#define HDRFMT  "%-32.32s %10s %5.5s  %s\n"
#define DASHES  "-------------------------------- "     \
                "---------- -----  ---------------\n"

static struct flaglist {
        int             flag;
        const char      str[32]; /* must be longer than the longest one. */
} fl[] = {
        { .flag = VFCF_STATIC, .str = "static", },
        { .flag = VFCF_NETWORK, .str = "network", },
        { .flag = VFCF_READONLY, .str = "read-only", },
        { .flag = VFCF_SYNTHETIC, .str = "synthetic", },
        { .flag = VFCF_LOOPBACK, .str = "loopback", },
        { .flag = VFCF_UNICODE, .str = "unicode", },
};

static const char *fmt_flags(int);

int
main(int argc, char **argv)
{
        int rv = 0;
        struct vfsconf vfc;
        struct ovfsconf *ovfcp;
        argc--, argv++;

        setvfsent(1);

        printf(HDRFMT, "Filesystem", "Num", "Refs", "Flags");
        fputs(DASHES, stdout);

        if (argc) {
                for(; argc; argc--, argv++) {
                        if (getvfsbyname(*argv, &vfc) == 0) {
                                printf(FMT, vfc.vfc_name, vfc.vfc_typenum,
                                    vfc.vfc_refcount,
                                    fmt_flags(vfc.vfc_flags));
                        } else {
                                warnx("VFS %s unknown or not loaded", *argv);
                                rv = 1;
                        }
                }
        } else {
                while ((ovfcp = getvfsent()) != NULL) {
                        if (getvfsbyname(ovfcp->vfc_name, &vfc) == 0) {
                                printf(FMT, vfc.vfc_name, vfc.vfc_typenum,
                                    vfc.vfc_refcount,
                                    fmt_flags(vfc.vfc_flags));
                        } else {
                                warnx("VFS %s unknown or not loaded", *argv);
                                rv = 1;
                        }
                }
        }

        endvfsent();
        return rv;
}

static const char *
fmt_flags(int flags)
{
        static char buf[sizeof(struct flaglist) * sizeof(fl)];
        size_t i;

        buf[0] = '\0';
        for (i = 0; i < nitems(fl); i++)
                if (flags & fl[i].flag) {
                        strlcat(buf, fl[i].str, sizeof(buf));
                        strlcat(buf, ", ", sizeof(buf));
                }
        if (buf[0] != '\0')
                buf[strlen(buf) - 2] = '\0';
        return (buf);
}