/*-
 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * file/module function dispatcher, support, etc.
 */

#include <stand.h>
#include <string.h>
#include <sys/param.h>
#include <sys/linker.h>
#include <sys/module.h>
#include <sys/queue.h>
#include <sys/stdint.h>
#include <sys/font.h>
#include <gfx_fb.h>

#if defined(LOADER_FDT_SUPPORT)
#include <fdt_platform.h>
#endif

#include "bootstrap.h"
#include "modinfo.h"

#define MDIR_REMOVED    0x0001
#define MDIR_NOHINTS    0x0002

struct moduledir {
        char    *d_path;        /* path of modules directory */
        u_char  *d_hints;       /* content of linker.hints file */
        int     d_hintsz;       /* size of hints data */
        int     d_flags;
        STAILQ_ENTRY(moduledir) d_link;
};

static int                      file_load(char *filename, vm_offset_t dest, struct preloaded_file **result);
static int                      file_load_dependencies(struct preloaded_file *base_mod);
static char *                   file_search(const char *name, char **extlist);
static struct kernel_module *   file_findmodule(struct preloaded_file *fp, char *modname, struct mod_depend *verinfo);
static int                      file_havepath(const char *name);
static char                     *mod_searchmodule(char *name, struct mod_depend *verinfo);
static char *                   mod_searchmodule_pnpinfo(const char *bus, const char *pnpinfo);
static void                     file_insert_tail(struct preloaded_file *mp);
static void                     file_remove(struct preloaded_file *fp);
static void                     file_remove_tail(struct preloaded_file *fp);
static struct file_metadata *   metadata_next(struct file_metadata *base_mp, int type);
static void                     moduledir_readhints(struct moduledir *mdp);
static void                     moduledir_rebuild(void);

/* load address should be tweaked by first module loaded (kernel) */
static vm_offset_t      loadaddr = 0;

#if defined(LOADER_FDT_SUPPORT)
static const char       *default_searchpath =
    "/boot/kernel;/boot/modules;/boot/dtb";
#else
static const char       *default_searchpath = "/boot/kernel;/boot/modules";
#endif

static STAILQ_HEAD(, moduledir) moduledir_list =
    STAILQ_HEAD_INITIALIZER(moduledir_list);

struct preloaded_file *preloaded_files = NULL;

static char *kld_ext_list[] = {
    ".ko",
    "",
    ".debug",
    NULL
};

/*
 * load an object, either a disk file or code module.
 *
 * To load a file, the syntax is:
 *
 * load -t <type> <path>
 *
 * code modules are loaded as:
 *
 * load <path> <options>
 */

COMMAND_SET(load, "load", "load a kernel or module", command_load);

static int
command_load(int argc, char *argv[])
{
        struct preloaded_file *fp;
        char    *typestr;
#ifdef LOADER_VERIEXEC
        char    *prefix, *skip;
        int     dflag = 0;
        char    *args = "dkp:s:t:";
#else
        char    *args = "kt:";
#endif
        int     dofile, dokld, ch, error;

        dokld = dofile = 0;
        optind = 1;
        optreset = 1;
        typestr = NULL;
        if (argc == 1) {
                command_errmsg = "no filename specified";
                return (CMD_CRIT);
        }
#ifdef LOADER_VERIEXEC
        prefix = NULL;
        skip = NULL;
#endif
        while ((ch = getopt(argc, argv, args)) != -1) {
                switch(ch) {
#ifdef LOADER_VERIEXEC
                case 'd':
                        dflag++;
                        break;
#endif
                case 'k':
                        dokld = 1;
                        break;
#ifdef LOADER_VERIEXEC
                case 'p':
                        prefix = optarg;
                        break;
                case 's':
                        skip = optarg;
                        break;
#endif
                case 't':
                        typestr = optarg;
                        dofile = 1;
                        break;
                case '?':
                default:
                        /* getopt has already reported an error */
                        return (CMD_OK);
                }
        }
        argv += (optind - 1);
        argc -= (optind - 1);

        /*
         * Request to load a raw file?
         */
        if (dofile) {
                if ((argc != 2) || (typestr == NULL) || (*typestr == 0)) {
                        command_errmsg = "invalid load type";
                        return (CMD_CRIT);
                }

#ifdef LOADER_VERIEXEC
                if (strncmp(typestr, "manifest", 8) == 0) {
                        if (dflag > 0)
                                ve_debug_set(dflag);
                        return (load_manifest(argv[1], prefix, skip, NULL));
                }
#ifdef LOADER_VERIEXEC_PASS_MANIFEST
                if (strncmp(typestr, "pass_manifest", 13) == 0) {
                        if (dflag > 0)
                                ve_debug_set(dflag);
                    return (pass_manifest(argv[1], prefix));
                }
#endif
#endif

                fp = file_findfile(argv[1], typestr);
                if (fp) {
                        snprintf(command_errbuf, sizeof(command_errbuf),
                          "warning: file '%s' already loaded", argv[1]);
                        return (CMD_WARN);
                }

                if (file_loadraw(argv[1], typestr, 1) != NULL)
                        return (CMD_OK);

                /* Failing to load mfs_root is never going to end well! */
                if (strcmp("mfs_root", typestr) == 0)
                        return (CMD_FATAL);

                return (CMD_ERROR);
        }
        /*
         * Do we have explicit KLD load ?
         */
        if (dokld || file_havepath(argv[1])) {
                error = mod_loadkld(argv[1], argc - 2, argv + 2);
                if (error == EEXIST) {
                        snprintf(command_errbuf, sizeof(command_errbuf),
                          "warning: KLD '%s' already loaded", argv[1]);
                        return (CMD_WARN);
                }
        
                return (error == 0 ? CMD_OK : CMD_CRIT);
        }
        /*
         * Looks like a request for a module.
         */
        error = mod_load(argv[1], NULL, argc - 2, argv + 2);
        if (error == EEXIST) {
                snprintf(command_errbuf, sizeof(command_errbuf),
                  "warning: module '%s' already loaded", argv[1]);
                return (CMD_WARN);
        }

        return (error == 0 ? CMD_OK : CMD_CRIT);
}

#ifdef LOADER_GELI_SUPPORT
COMMAND_SET(load_geli, "load_geli", "load a geli key", command_load_geli);

static int
command_load_geli(int argc, char *argv[])
{
        char    typestr[80];
        char    *cp;
        int             ch, num;

        if (argc < 3) {
                command_errmsg = "usage is [-n key#] <prov> <file>";
                return(CMD_ERROR);
        }

        num = 0;
        optind = 1;
        optreset = 1;
        while ((ch = getopt(argc, argv, "n:")) != -1) {
                switch(ch) {
                case 'n':
                        num = strtol(optarg, &cp, 0);
                        if (cp == optarg) {
                                snprintf(command_errbuf, sizeof(command_errbuf),
                                  "bad key index '%s'", optarg);
                                return(CMD_ERROR);
                        }
                        break;
                case '?':
                default:
                        /* getopt has already reported an error */
                        return(CMD_OK);
                }
        }
        argv += (optind - 1);
        argc -= (optind - 1);
        sprintf(typestr, "%s:geli_keyfile%d", argv[1], num);
        return (file_loadraw(argv[2], typestr, 1) ? CMD_OK : CMD_ERROR);
}
#endif

void
unload(void)
{
        struct preloaded_file *fp;

        while (preloaded_files != NULL) {
                fp = preloaded_files;
                preloaded_files = preloaded_files->f_next;
                file_discard(fp);
        }
        loadaddr = 0;
        unsetenv("kernelname");
}

COMMAND_SET(unload, "unload", "unload all modules", command_unload);

static int
command_unload(int argc, char *argv[])
{
        unload();
        return(CMD_OK);
}

COMMAND_SET(lsmod, "lsmod", "list loaded modules", command_lsmod);

static int
command_lsmod(int argc, char *argv[])
{
        struct preloaded_file   *fp;
        struct kernel_module    *mp;
        struct file_metadata    *md;
        char                    lbuf[80];
        int                             ch, verbose, ret = 0;

        verbose = 0;
        optind = 1;
        optreset = 1;
        while ((ch = getopt(argc, argv, "v")) != -1) {
                switch(ch) {
                case 'v':
                        verbose = 1;
                        break;
                case '?':
                default:
                        /* getopt has already reported an error */
                        return(CMD_OK);
                }
        }

        pager_open();
        for (fp = preloaded_files; fp; fp = fp->f_next) {
                snprintf(lbuf, sizeof(lbuf), " %p: ", (void *) fp->f_addr);
                pager_output(lbuf);
                pager_output(fp->f_name);
                snprintf(lbuf, sizeof(lbuf), " (%s, 0x%lx)\n", fp->f_type,
                  (long)fp->f_size);
                if (pager_output(lbuf))
                        break;
                if (fp->f_args != NULL) {
                        pager_output("    args: ");
                        pager_output(fp->f_args);
                        if (pager_output("\n"))
                                break;
                }
                if (fp->f_modules) {
                        pager_output("  modules: ");
                        for (mp = fp->f_modules; mp; mp = mp->m_next) {
                                snprintf(lbuf, sizeof(lbuf), "%s.%d ", mp->m_name,
                                  mp->m_version);
                                pager_output(lbuf);
                        }
                        if (pager_output("\n"))
                                break;
                }
                if (verbose) {
                        /* XXX could add some formatting smarts here to display some better */
                        for (md = fp->f_metadata; md != NULL; md = md->md_next) {
                                snprintf(lbuf, sizeof(lbuf), "      0x%04x, 0x%lx\n",
                                  md->md_type, (long) md->md_size);
                                if (pager_output(lbuf))
                                        break;
                        }
                }
                if (ret)
                        break;
        }
        pager_close();
        return(CMD_OK);
}

COMMAND_SET(pnpmatch, "pnpmatch", "list matched modules based on pnpinfo", command_pnpmatch);

static int pnp_dump_flag = 0;
static int pnp_unbound_flag = 0;
static int pnp_verbose_flag = 0;

static int
command_pnpmatch(int argc, char *argv[])
{
        char *module;
        int ch;

        pnp_verbose_flag = 0;
        pnp_dump_flag = 0;
        optind = 1;
        optreset = 1;
        while ((ch = getopt(argc, argv, "vd")) != -1) {
                switch(ch) {
                case 'v':
                        pnp_verbose_flag = 1;
                        break;
                case 'd':
                        pnp_dump_flag = 1;
                        break;
                case '?':
                default:
                        /* getopt has already reported an error */
                        return(CMD_OK);
                }
        }
        argv += optind;
        argc -= optind;

        if (argc != 2) {
                command_errmsg = "Usage: pnpmatch <busname> compat=<compatdata>";
                return (CMD_CRIT);
        }

        module = mod_searchmodule_pnpinfo(argv[0], argv[1]);
        if (module)
                printf("Matched module: %s\n", module);
        else
                printf("No module matches %s on bus %s\n", argv[1], argv[0]);

        return (CMD_OK);
}

COMMAND_SET(pnpload, "pnpload", "load matched modules based on pnpinfo", command_pnpload);

static int
command_pnpload(int argc, char *argv[])
{
        char *module;
        int ch, error;

        pnp_verbose_flag = 0;
        pnp_dump_flag = 0;
        optind = 1;
        optreset = 1;
        while ((ch = getopt(argc, argv, "vd")) != -1) {
                switch(ch) {
                case 'v':
                        pnp_verbose_flag = 1;
                        break;
                case 'd':
                        pnp_dump_flag = 1;
                        break;
                case '?':
                default:
                        /* getopt has already reported an error */
                        return(CMD_OK);
                }
        }
        argv += optind;
        argc -= optind;

        if (argc != 2) {
                command_errmsg = "Usage: pnpload <busname> compat=<compatdata>";
                return (CMD_ERROR);
        }

        module = mod_searchmodule_pnpinfo(argv[0], argv[1]);

        error = mod_load(module, NULL, 0, NULL);
        if (error == EEXIST) {
                snprintf(command_errbuf, sizeof(command_errbuf),
                  "warning: module '%s' already loaded", argv[1]);
                return (CMD_WARN);
        }

        return (error == 0 ? CMD_OK : CMD_CRIT);
}

#if defined(LOADER_FDT_SUPPORT)
static void
pnpautoload_fdt_bus(const char *busname)
{
        const char *pnpstring;
        const char *compatstr;
        char *pnpinfo = NULL;
        char *module = NULL;
        int tag = 0, len, pnplen;
        int error;

        while (1) {
                pnpstring = fdt_devmatch_next(&tag, &len);
                if (pnpstring == NULL)
                        return;

                compatstr = pnpstring;
                for (pnplen = 0; pnplen != len; compatstr = pnpstring + pnplen) {
                        pnplen += strlen(compatstr) + 1;
                        asprintf(&pnpinfo, "compat=%s", compatstr);

                        module = mod_searchmodule_pnpinfo(busname, pnpinfo);
                        if (module) {
                                error = mod_loadkld(module, 0, NULL);
                                if (error)
                                        printf("Cannot load module %s\n", module);
                                break;
                        }
                }
                free(pnpinfo);
                free(module);
        }
}
#endif

struct pnp_bus {
        const char *name;
        void (*load)(const char *busname);
};

struct pnp_bus pnp_buses[] = {
#if defined(LOADER_FDT_SUPPORT)
        {"simplebus", pnpautoload_fdt_bus},
        {"ofwbus", pnpautoload_fdt_bus},
        {"iicbus", pnpautoload_fdt_bus},
        {"spibus", pnpautoload_fdt_bus},
#endif
};

COMMAND_SET(pnpautoload, "pnpautoload", "auto load modules based on pnpinfo", command_pnpautoload);

static int
command_pnpautoload(int argc, char *argv[])
{
        int i;
        int verbose;
        int ch, match;

        pnp_verbose_flag = 0;
        pnp_dump_flag = 0;
        verbose = 0;
        optind = 1;
        optreset = 1;
        match = 0;
        while ((ch = getopt(argc, argv, "v")) != -1) {
                switch(ch) {
                case 'v':
                        verbose = 1;
                        break;
                case '?':
                default:
                        /* getopt has already reported an error */
                        return(CMD_OK);
                }
        }
        argv += (optind - 1);
        argc -= (optind - 1);

        if (argc > 2)
                return (CMD_ERROR);

        for (i = 0; i < nitems(pnp_buses); i++) {
                if (argc == 2 && strcmp(argv[1], pnp_buses[i].name) != 0) {
                        if (verbose)
                                printf("Skipping bus %s\n", pnp_buses[i].name);
                        continue;
                }
                if (verbose)
                        printf("Autoloading modules for %s\n", pnp_buses[i].name);
                pnp_buses[i].load(pnp_buses[i].name);
                match = 1;
        }
        if (match == 0)
                printf("Unsupported bus %s\n", argv[1]);

        return (CMD_OK);
}

/*
 * File level interface, functions file_*
 */
static int
file_load(char *filename, vm_offset_t dest, struct preloaded_file **result)
{
        static int last_file_format = 0;
        struct preloaded_file *fp;
        int error;
        int i;

        TSENTER2(filename);
        dest = md_align(dest);

        error = EFTYPE;
        for (i = last_file_format, fp = NULL;
             file_formats[i] && fp == NULL; i++) {
                error = (file_formats[i]->l_load)(filename, dest, &fp);
                if (error == 0) {
                        fp->f_loader = last_file_format = i; /* remember the loader */
                        *result = fp;
                        break;
                } else if (last_file_format == i && i != 0) {
                        /* Restart from the beginning */
                        i = -1;
                        last_file_format = 0;
                        fp = NULL;
                        continue;
                }
                if (error == EFTYPE)
                        continue;               /* Unknown to this handler? */
                if (error) {
                        snprintf(command_errbuf, sizeof(command_errbuf),
                          "can't load file '%s': %s", filename, strerror(error));
                        break;
                }
        }
        TSEXIT();
        return (error);
}

static int
file_load_dependencies(struct preloaded_file *base_file)
{
        struct file_metadata *md;
        struct preloaded_file *fp;
        struct mod_depend *verinfo;
        struct kernel_module *mp;
        char *dmodname;
        int error;

        md = file_findmetadata(base_file, MODINFOMD_DEPLIST);
        if (md == NULL)
                return (0);
        error = 0;
        do {
                verinfo = (struct mod_depend*)md->md_data;
                dmodname = (char *)(verinfo + 1);
                if (file_findmodule(NULL, dmodname, verinfo) == NULL) {
                        if (module_verbose > MODULE_VERBOSE_SILENT)
                                printf("loading required module '%s'\n", dmodname);
                        error = mod_load(dmodname, verinfo, 0, NULL);
                        if (error)
                                break;
                        /*
                         * If module loaded via kld name which isn't listed
                         * in the linker.hints file, we should check if it have
                         * required version.
                         */
                        mp = file_findmodule(NULL, dmodname, verinfo);
                        if (mp == NULL) {
                                snprintf(command_errbuf, sizeof(command_errbuf),
                                  "module '%s' exists but with wrong version", dmodname);
                                error = ENOENT;
                                break;
                        }
                }
                md = metadata_next(md, MODINFOMD_DEPLIST);
        } while (md);
        if (!error)
                return (0);
        /* Load failed; discard everything */
        while (base_file != NULL) {
                fp = base_file;
                base_file = base_file->f_next;
                file_discard(fp);
        }
        return (error);
}

#ifdef LOADER_VERIEXEC_VECTX
#define VECTX_HANDLE(fd) vctx
#else
#define VECTX_HANDLE(fd) fd
#endif


/*
 * We've been asked to load (fname) as (type), so just suck it in,
 * no arguments or anything.
 */
struct preloaded_file *
file_loadraw(const char *fname, const char *type, int insert)
{
        struct preloaded_file   *fp;
        char                    *name;
        int                             fd, got;
        vm_offset_t                     laddr;
#ifdef LOADER_VERIEXEC_VECTX
        struct vectx            *vctx;
        int                     verror;
#endif

        TSENTER2(fname);
        /* We can't load first */
        if ((file_findfile(NULL, NULL)) == NULL) {
                command_errmsg = "can't load file before kernel";
                TSEXIT();
                return(NULL);
        }

        /* locate the file on the load path */
        name = file_search(fname, NULL);
        if (name == NULL) {
                snprintf(command_errbuf, sizeof(command_errbuf),
                  "can't find '%s'", fname);
                TSEXIT();
                return(NULL);
        }

        if ((fd = open(name, O_RDONLY)) < 0) {
                snprintf(command_errbuf, sizeof(command_errbuf),
                  "can't open '%s': %s", name, strerror(errno));
                free(name);
                TSEXIT();
                return(NULL);
        }

#ifdef LOADER_VERIEXEC_VECTX
        vctx = vectx_open(fd, name, 0L, NULL, &verror, __func__);
        if (verror) {
                sprintf(command_errbuf, "can't verify '%s': %s",
                    name, ve_error_get());
                free(name);
                free(vctx);
                close(fd);
                TSEXIT();
                return(NULL);
        }
#else
#ifdef LOADER_VERIEXEC
        if (verify_file(fd, name, 0, VE_MUST, __func__) < 0) {
                sprintf(command_errbuf, "can't verify '%s': %s",
                    name, ve_error_get());
                free(name);
                close(fd);
                TSEXIT();
                return(NULL);
        }
#endif
#endif

        loadaddr = md_align(loadaddr);

        if (module_verbose > MODULE_VERBOSE_SILENT)
                printf("%s ", name);

        laddr = loadaddr;
        for (;;) {
                /* read in 4k chunks; size is not really important */
                got = archsw.arch_readin(VECTX_HANDLE(fd), laddr, 4096);
                if (got == 0)                           /* end of file */
                        break;
                if (got < 0) {                          /* error */
                        snprintf(command_errbuf, sizeof(command_errbuf),
                          "error reading '%s': %s", name, strerror(errno));
                        free(name);
                        close(fd);
#ifdef LOADER_VERIEXEC_VECTX
                        free(vctx);
#endif
                        TSEXIT();
                        return(NULL);
                }
                laddr += got;
        }

        if (module_verbose > MODULE_VERBOSE_SILENT)
                printf("size=%#jx\n", (uintmax_t)(laddr - loadaddr));
#ifdef LOADER_VERIEXEC_VECTX
        verror = vectx_close(vctx, VE_MUST, __func__);
        if (verror) {
                free(name);
                close(fd);
                free(vctx);
                TSEXIT();
                return(NULL);
        }
#endif

        /* Looks OK so far; create & populate control structure */
        fp = file_alloc();
        if (fp == NULL) {
                snprintf(command_errbuf, sizeof (command_errbuf),
                    "no memory to load %s", name);
                free(name);
                close(fd);
                TSEXIT();
                return (NULL);
        }
        fp->f_name = name;
        fp->f_type = strdup(type);
        fp->f_args = NULL;
        fp->f_metadata = NULL;
        fp->f_loader = -1;
        fp->f_addr = loadaddr;
        fp->f_size = laddr - loadaddr;

        if (fp->f_type == NULL) {
                snprintf(command_errbuf, sizeof (command_errbuf),
                    "no memory to load %s", name);
                free(name);
                close(fd);
                TSEXIT();
                return (NULL);
        }
        /* recognise space consumption */
        loadaddr = laddr;

        /* Add to the list of loaded files */
        if (insert != 0)
                file_insert_tail(fp);
        close(fd);
        TSEXIT();
        return(fp);
}

/*
 * Load the module (name), pass it (argc),(argv), add container file
 * to the list of loaded files.
 * If module is already loaded just assign new argc/argv.
 */
int
mod_load(char *modname, struct mod_depend *verinfo, int argc, char *argv[])
{
        struct kernel_module    *mp;
        int                             err;
        char                    *filename;

        TSENTER2(modname);
        if (file_havepath(modname)) {
                printf("Warning: mod_load() called instead of mod_loadkld() for module '%s'\n", modname);
                TSEXIT();
                return (mod_loadkld(modname, argc, argv));
        }
        /* see if module is already loaded */
        mp = file_findmodule(NULL, modname, verinfo);
        if (mp) {
#ifdef moduleargs
                free(mp->m_args);
                mp->m_args = unargv(argc, argv);
#endif
                snprintf(command_errbuf, sizeof(command_errbuf),
                  "warning: module '%s' already loaded", mp->m_name);
                TSEXIT();
                return (0);
        }
        /* locate file with the module on the search path */
        filename = mod_searchmodule(modname, verinfo);
        if (filename == NULL) {
                snprintf(command_errbuf, sizeof(command_errbuf),
                  "can't find '%s'", modname);
                TSEXIT();
                return (ENOENT);
        }
        err = mod_loadkld(filename, argc, argv);
        free(filename);
        TSEXIT();
        return (err);
}

/*
 * Load specified KLD. If path is omitted, then try to locate it via
 * search path.
 */
int
mod_loadkld(const char *kldname, int argc, char *argv[])
{
        struct preloaded_file   *fp;
        int                     err;
        char                    *filename;
        vm_offset_t             loadaddr_saved;

        TSENTER2(kldname);
        /*
         * Get fully qualified KLD name
         */
        filename = file_search(kldname, kld_ext_list);
        if (filename == NULL) {
                snprintf(command_errbuf, sizeof(command_errbuf),
                  "can't find '%s'", kldname);
                TSEXIT();
                return (ENOENT);
        }
        /*
         * Check if KLD already loaded
         */
        fp = file_findfile(filename, NULL);
        if (fp) {
                snprintf(command_errbuf, sizeof(command_errbuf),
                  "warning: KLD '%s' already loaded", filename);
                free(filename);
                TSEXIT();
                return (0);
        }

        do {
                err = file_load(filename, loadaddr, &fp);
                if (err)
                        break;
                fp->f_args = unargv(argc, argv);
                loadaddr_saved = loadaddr;
                loadaddr = fp->f_addr + fp->f_size;
                file_insert_tail(fp);   /* Add to the list of loaded files */
                if (file_load_dependencies(fp) != 0) {
                        err = ENOENT;
                        file_remove_tail(fp);
                        loadaddr = loadaddr_saved;
                        fp = NULL;
                        break;
                }
        } while(0);
        if (err == EFTYPE) {
                snprintf(command_errbuf, sizeof(command_errbuf),
                  "don't know how to load module '%s'", filename);
        }
        if (err)
                file_discard(fp);
        free(filename);
        TSEXIT();
        return (err);
}

/*
 * Find a file matching (name) and (type).
 * NULL may be passed as a wildcard to either.
 */
struct preloaded_file *
file_findfile(const char *name, const char *type)
{
        struct preloaded_file *fp;

        for (fp = preloaded_files; fp != NULL; fp = fp->f_next) {
                if (((name == NULL) || !strcmp(name, fp->f_name)) &&
                  ((type == NULL) || !strcmp(type, fp->f_type)))
                        break;
        }
        return (fp);
}

/*
 * Find a module matching (name) inside of given file.
 * NULL may be passed as a wildcard.
 */
static struct kernel_module *
file_findmodule(struct preloaded_file *fp, char *modname,
        struct mod_depend *verinfo)
{
        struct kernel_module *mp, *best;
        int bestver, mver;

        if (fp == NULL) {
                for (fp = preloaded_files; fp; fp = fp->f_next) {
                        mp = file_findmodule(fp, modname, verinfo);
                        if (mp)
                                return (mp);
                }
                return (NULL);
        }
        best = NULL;
        bestver = 0;
        for (mp = fp->f_modules; mp; mp = mp->m_next) {
                if (strcmp(modname, mp->m_name) == 0) {
                        if (verinfo == NULL)
                                return (mp);
                        mver = mp->m_version;
                        if (mver == verinfo->md_ver_preferred)
                                return (mp);
                        if (mver >= verinfo->md_ver_minimum &&
                          mver <= verinfo->md_ver_maximum &&
                          mver > bestver) {
                                best = mp;
                                bestver = mver;
                        }
                }
        }
        return (best);
}
/*
 * Make a copy of (size) bytes of data from (p), and associate them as
 * metadata of (type) to the module (mp).
 */
void
file_addmetadata(struct preloaded_file *fp, int type, size_t size, void *p)
{
        struct file_metadata    *md;

        md = malloc(sizeof(struct file_metadata) - sizeof(md->md_data) + size);
        if (md != NULL) {
                md->md_size = size;
                md->md_type = type;
                bcopy(p, md->md_data, size);
                md->md_next = fp->f_metadata;
        }
        fp->f_metadata = md;
}

/*
 * Find a metadata object of (type) associated with the file (fp)
 */
struct file_metadata *
file_findmetadata(struct preloaded_file *fp, int type)
{
        struct file_metadata *md;

        for (md = fp->f_metadata; md != NULL; md = md->md_next)
                if (md->md_type == type)
                        break;
        return(md);
}

/*
 * Remove all metadata from the file.
 */
void
file_removemetadata(struct preloaded_file *fp)
{
        struct file_metadata *md, *next;

        for (md = fp->f_metadata; md != NULL; md = next)
        {
                next = md->md_next;
                free(md);
        }
        fp->f_metadata = NULL;
}

/*
 * Add a buffer to the list of preloaded "files".
 */
int
file_addbuf(const char *name, const char *type, size_t len, void *buf)
{
        struct preloaded_file   *fp;
        vm_offset_t dest;

        /* We can't load first */
        if ((file_findfile(NULL, NULL)) == NULL) {
                command_errmsg = "can't load file before kernel";
                return (-1);
        }

        /* Figure out where to load the data. */
        dest = md_align(loadaddr);

        /* Create & populate control structure */
        fp = file_alloc();
        if (fp == NULL) {
                snprintf(command_errbuf, sizeof (command_errbuf),
                    "no memory to load %s", name);
                return (-1);
        }
        fp->f_name = strdup(name);
        fp->f_type = strdup(type);
        fp->f_args = NULL;
        fp->f_metadata = NULL;
        fp->f_loader = -1;
        fp->f_addr = dest;
        fp->f_size = len;
        if ((fp->f_name == NULL) || (fp->f_type == NULL)) {
                snprintf(command_errbuf, sizeof (command_errbuf),
                    "no memory to load %s", name);
                free(fp->f_name);
                free(fp->f_type);
                return (-1);
        }

        /* Copy the data in. */
        archsw.arch_copyin(buf, fp->f_addr, len);
        loadaddr = fp->f_addr + len;

        /* Add to the list of loaded files */
        file_insert_tail(fp);
        return(0);
}

static struct file_metadata *
metadata_next(struct file_metadata *md, int type)
{

        if (md == NULL)
                return (NULL);
        while((md = md->md_next) != NULL)
                if (md->md_type == type)
                        break;
        return (md);
}

static char *emptyextlist[] = { "", NULL };

/*
 * Check if the given file is in place and return full path to it.
 */
static char *
file_lookup(const char *path, const char *name, int namelen, char **extlist)
{
        struct stat     st;
        char    *result, *cp, **cpp;
        int             pathlen, extlen, len;

        pathlen = strlen(path);
        extlen = 0;
        if (extlist == NULL)
                extlist = emptyextlist;
        for (cpp = extlist; *cpp; cpp++) {
                len = strlen(*cpp);
                if (len > extlen)
                        extlen = len;
        }
        result = malloc(pathlen + namelen + extlen + 2);
        if (result == NULL)
                return (NULL);
        bcopy(path, result, pathlen);
        if (pathlen > 0 && result[pathlen - 1] != '/')
                result[pathlen++] = '/';
        cp = result + pathlen;
        bcopy(name, cp, namelen);
        cp += namelen;
        for (cpp = extlist; *cpp; cpp++) {
                strcpy(cp, *cpp);
                if (stat(result, &st) == 0 && S_ISREG(st.st_mode))
                        return result;
        }
        free(result);
        return NULL;
}

/*
 * Check if file name have any qualifiers
 */
static int
file_havepath(const char *name)
{
        const char              *cp;

        archsw.arch_getdev(NULL, name, &cp);
        return (cp != name || strchr(name, '/') != NULL);
}

/*
 * Attempt to find the file (name) on the module searchpath.
 * If (name) is qualified in any way, we simply check it and
 * return it or NULL.  If it is not qualified, then we attempt
 * to construct a path using entries in the environment variable
 * module_path.
 *
 * The path we return a pointer to need never be freed, as we manage
 * it internally.
 */
static char *
file_search(const char *name, char **extlist)
{
        struct moduledir        *mdp;
        struct stat             sb;
        char            *result;
        int                     namelen;

        /* Don't look for nothing */
        if (name == NULL)
                return(NULL);

        if (*name == 0)
                return(strdup(name));

        if (file_havepath(name)) {
                /* Qualified, so just see if it exists */
                if (stat(name, &sb) == 0)
                        return(strdup(name));
                return(NULL);
        }
        moduledir_rebuild();
        result = NULL;
        namelen = strlen(name);
        STAILQ_FOREACH(mdp, &moduledir_list, d_link) {
                result = file_lookup(mdp->d_path, name, namelen, extlist);
                if (result)
                        break;
        }
        return(result);
}

#define INT_ALIGN(base, ptr)    ptr = \
        (base) + roundup2((ptr) - (base), sizeof(int))

static char *
mod_search_hints(struct moduledir *mdp, const char *modname,
        struct mod_depend *verinfo)
{
        u_char  *cp, *recptr, *bufend, *best;
        char    *result;
        int             *intp, bestver, blen, clen, found, ival, modnamelen, reclen;

        moduledir_readhints(mdp);
        modnamelen = strlen(modname);
        found = 0;
        result = NULL;
        bestver = 0;
        if (mdp->d_hints == NULL)
                goto bad;
        recptr = mdp->d_hints;
        bufend = recptr + mdp->d_hintsz;
        clen = blen = 0;
        best = cp = NULL;
        while (recptr < bufend && !found) {
                intp = (int*)recptr;
                reclen = *intp++;
                ival = *intp++;
                cp = (u_char*)intp;
                switch (ival) {
                case MDT_VERSION:
                        clen = *cp++;
                        if (clen != modnamelen || bcmp(cp, modname, clen) != 0)
                                break;
                        cp += clen;
                        INT_ALIGN(mdp->d_hints, cp);
                        ival = *(int*)cp;
                        cp += sizeof(int);
                        clen = *cp++;
                        if (verinfo == NULL || ival == verinfo->md_ver_preferred) {
                                found = 1;
                                break;
                        }
                        if (ival >= verinfo->md_ver_minimum &&
                          ival <= verinfo->md_ver_maximum &&
                          ival > bestver) {
                                bestver = ival;
                                best = cp;
                                blen = clen;
                        }
                        break;
                default:
                        break;
                }
                recptr += reclen + sizeof(int);
        }
        /*
         * Finally check if KLD is in the place
         */
        if (found)
                result = file_lookup(mdp->d_path, (const char *)cp, clen, NULL);
        else if (best)
                result = file_lookup(mdp->d_path, (const char *)best, blen, NULL);
bad:
        /*
         * If nothing found or hints is absent - fallback to the old way
         * by using "kldname[.ko]" as module name.
         */
        if (!found && !bestver && result == NULL)
                result = file_lookup(mdp->d_path, modname, modnamelen, kld_ext_list);
        return result;
}

static int
getint(void **ptr)
{
        int *p = *ptr;
        int rv;

        p = (int *)roundup2((intptr_t)p, sizeof(int));
        rv = *p++;
        *ptr = p;
        return rv;
}

static void
getstr(void **ptr, char *val)
{
        int *p = *ptr;
        char *c = (char *)p;
        int len = *(uint8_t *)c;

        memcpy(val, c + 1, len);
        val[len] = 0;
        c += len + 1;
        *ptr = (void *)c;
}

static int
pnpval_as_int(const char *val, const char *pnpinfo)
{
        int rv;
        char key[256];
        char *cp;

        if (pnpinfo == NULL)
                return -1;

        cp = strchr(val, ';');
        key[0] = ' ';
        if (cp == NULL)
                strlcpy(key + 1, val, sizeof(key) - 1);
        else {
                memcpy(key + 1, val, cp - val);
                key[cp - val + 1] = '\0';
        }
        strlcat(key, "=", sizeof(key));
        if (strncmp(key + 1, pnpinfo, strlen(key + 1)) == 0)
                rv = strtol(pnpinfo + strlen(key + 1), NULL, 0);
        else {
                cp = strstr(pnpinfo, key);
                if (cp == NULL)
                        rv = -1;
                else
                        rv = strtol(cp + strlen(key), NULL, 0);
        }
        return rv;
}

static void
quoted_strcpy(char *dst, const char *src)
{
        char q = ' ';

        if (*src == '\'' || *src == '"')
                q = *src++;
        while (*src && *src != q)
                *dst++ = *src++; // XXX backtick quoting
        *dst++ = '\0';
        // XXX overflow
}

static char *
pnpval_as_str(const char *val, const char *pnpinfo)
{
        static char retval[256];
        char key[256];
        char *cp;

        if (pnpinfo == NULL) {
                *retval = '\0';
                return retval;
        }

        cp = strchr(val, ';');
        key[0] = ' ';
        if (cp == NULL)
                strlcpy(key + 1, val, sizeof(key) - 1);
        else {
                memcpy(key + 1, val, cp - val);
                key[cp - val + 1] = '\0';
        }
        strlcat(key, "=", sizeof(key));
        if (strncmp(key + 1, pnpinfo, strlen(key + 1)) == 0)
                quoted_strcpy(retval, pnpinfo + strlen(key + 1));
        else {
                cp = strstr(pnpinfo, key);
                if (cp == NULL)
                        strcpy(retval, "MISSING");
                else
                        quoted_strcpy(retval, cp + strlen(key));
        }
        return retval;
}

static char *
devmatch_search_hints(struct moduledir *mdp, const char *bus, const char *dev, const char *pnpinfo)
{
        char val1[256], val2[256];
        int ival, len, ents, i, notme, mask, bit, v, found;
        void *ptr, *walker, *hints_end;
        char *lastmod = NULL, *cp, *s;

        moduledir_readhints(mdp);
        found = 0;
        if (mdp->d_hints == NULL)
                goto bad;
        walker = mdp->d_hints;
        hints_end = walker + mdp->d_hintsz;
        while (walker < hints_end && !found) {
                len = getint(&walker);
                ival = getint(&walker);
                ptr = walker;
                switch (ival) {
                case MDT_VERSION:
                        getstr(&ptr, val1);
                        ival = getint(&ptr);
                        getstr(&ptr, val2);
                        if (pnp_dump_flag || pnp_verbose_flag)
                                printf("Version: if %s.%d kmod %s\n", val1, ival, val2);
                        break;
                case MDT_MODULE:
                        getstr(&ptr, val1);
                        getstr(&ptr, val2);
                        if (lastmod)
                                free(lastmod);
                        lastmod = strdup(val2);
                        if (pnp_dump_flag || pnp_verbose_flag)
                                printf("module %s in %s\n", val1, val1);
                        break;
                case MDT_PNP_INFO:
                        if (!pnp_dump_flag && !pnp_unbound_flag && lastmod && strcmp(lastmod, "kernel") == 0)
                                break;
                        getstr(&ptr, val1);
                        getstr(&ptr, val2);
                        ents = getint(&ptr);
                        if (pnp_dump_flag || pnp_verbose_flag)
                                printf("PNP info for bus %s format %s %d entries (%s)\n",
                                    val1, val2, ents, lastmod);
                        if (strcmp(val1, "usb") == 0) {
                                if (pnp_verbose_flag)
                                        printf("Treating usb as uhub -- bug in source table still?\n");
                                strcpy(val1, "uhub");
                        }
                        if (bus && strcmp(val1, bus) != 0) {
                                if (pnp_verbose_flag)
                                        printf("Skipped because table for bus %s, looking for %s\n",
                                            val1, bus);
                                break;
                        }
                        for (i = 0; i < ents; i++) {
                                if (pnp_verbose_flag)
                                        printf("---------- Entry %d ----------\n", i);
                                if (pnp_dump_flag)
                                        printf("   ");
                                cp = val2;
                                notme = 0;
                                mask = -1;
                                bit = -1;
                                do {
                                        switch (*cp) {
                                                /* All integer fields */
                                        case 'I':
                                        case 'J':
                                        case 'G':
                                        case 'L':
                                        case 'M':
                                                ival = getint(&ptr);
                                                if (pnp_dump_flag) {
                                                        printf("%#x:", ival);
                                                        break;
                                                }
                                                if (bit >= 0 && ((1 << bit) & mask) == 0)
                                                        break;
                                                v = pnpval_as_int(cp + 2, pnpinfo);
                                                if (pnp_verbose_flag)
                                                        printf("Matching %s (%c) table=%#x tomatch=%#x\n",
                                                            cp + 2, *cp, v, ival);
                                                switch (*cp) {
                                                case 'J':
                                                        if (ival == -1)
                                                                break;
                                                        /*FALLTHROUGH*/
                                                case 'I':
                                                        if (v != ival)
                                                                notme++;
                                                        break;
                                                case 'G':
                                                        if (v < ival)
                                                                notme++;
                                                        break;
                                                case 'L':
                                                        if (v > ival)
                                                                notme++;
                                                        break;
                                                case 'M':
                                                        mask = ival;
                                                        break;
                                                }
                                                break;
                                                /* String fields */
                                        case 'D':
                                        case 'Z':
                                                getstr(&ptr, val1);
                                                if (pnp_dump_flag) {
                                                        printf("'%s':", val1);
                                                        break;
                                                }
                                                if (*cp == 'D')
                                                        break;
                                                s = pnpval_as_str(cp + 2, pnpinfo);
                                                if (strcmp(s, val1) != 0)
                                                        notme++;
                                                break;
                                                /* Key override fields, required to be last in the string */
                                        case 'T':
                                                /*
                                                 * This is imperfect and only does one key and will be redone
                                                 * to be more general for multiple keys. Currently, nothing
                                                 * does that.
                                                 */
                                                if (pnp_dump_flag)                              /* No per-row data stored */
                                                        break;
                                                if (cp[strlen(cp) - 1] == ';')          /* Skip required ; at end */
                                                        cp[strlen(cp) - 1] = '\0';      /* in case it's not there */
                                                if ((s = strstr(pnpinfo, cp + 2)) == NULL)
                                                        notme++;
                                                else if (s > pnpinfo && s[-1] != ' ')
                                                        notme++;
                                                break;
                                        default:
                                                printf("Unknown field type %c\n:", *cp);
                                                break;
                                        }
                                        bit++;
                                        cp = strchr(cp, ';');
                                        if (cp)
                                                cp++;
                                } while (cp && *cp);
                                if (pnp_dump_flag)
                                        printf("\n");
                                else if (!notme) {
                                        if (!pnp_unbound_flag) {
                                                if (pnp_verbose_flag)
                                                        printf("Matches --- %s ---\n", lastmod);
                                        }
                                        found++;
                                }
                        }
                        break;
                default:
                        break;
                }
                walker = (void *)(len - sizeof(int) + (intptr_t)walker);
        }
        if (pnp_unbound_flag && found == 0 && *pnpinfo) {
                if (pnp_verbose_flag)
                        printf("------------------------- ");
                printf("%s on %s pnpinfo %s", *dev ? dev : "unattached", bus, pnpinfo);
                if (pnp_verbose_flag)
                        printf(" -------------------------");
                printf("\n");
        }
        if (found != 0)
                return (lastmod);
        free(lastmod);

bad:
        return (NULL);
}

/*
 * Attempt to locate the file containing the module (name)
 */
static char *
mod_searchmodule(char *name, struct mod_depend *verinfo)
{
        struct  moduledir *mdp;
        char    *result;

        moduledir_rebuild();
        /*
         * Now we ready to lookup module in the given directories
         */
        result = NULL;
        STAILQ_FOREACH(mdp, &moduledir_list, d_link) {
                result = mod_search_hints(mdp, name, verinfo);
                if (result)
                        break;
        }

        return(result);
}

static char *
mod_searchmodule_pnpinfo(const char *bus, const char *pnpinfo)
{
        struct  moduledir *mdp;
        char    *result;

        moduledir_rebuild();
        /*
         * Now we ready to lookup module in the given directories
         */
        result = NULL;
        STAILQ_FOREACH(mdp, &moduledir_list, d_link) {
                result = devmatch_search_hints(mdp, bus, NULL, pnpinfo);
                if (result)
                        break;
        }

        return(result);
}

int
file_addmodule(struct preloaded_file *fp, char *modname, int version,
        struct kernel_module **newmp)
{
        struct kernel_module *mp;
        struct mod_depend mdepend;

        bzero(&mdepend, sizeof(mdepend));
        mdepend.md_ver_preferred = version;
        mp = file_findmodule(fp, modname, &mdepend);
        if (mp)
                return (EEXIST);
        mp = calloc(1, sizeof(struct kernel_module));
        if (mp == NULL)
                return (ENOMEM);
        mp->m_name = strdup(modname);
        if (mp->m_name == NULL) {
                free(mp);
                return (ENOMEM);
        }
        mp->m_version = version;
        mp->m_fp = fp;
        mp->m_next = fp->f_modules;
        fp->f_modules = mp;
        if (newmp)
                *newmp = mp;
        return (0);
}

/*
 * Throw a file away
 */
void
file_discard(struct preloaded_file *fp)
{
        struct file_metadata    *md, *md1;
        struct kernel_module    *mp, *mp1;
        if (fp == NULL)
                return;
        md = fp->f_metadata;
        while (md) {
                md1 = md;
                md = md->md_next;
                free(md1);
        }
        mp = fp->f_modules;
        while (mp) {
                free(mp->m_name);
                mp1 = mp;
                mp = mp->m_next;
                free(mp1);
        }
        free(fp->f_name);
        free(fp->f_type);
        free(fp->f_args);
        free(fp);
}

/*
 * Allocate a new file; must be used instead of malloc()
 * to ensure safe initialisation.
 */
struct preloaded_file *
file_alloc(void)
{

        return (calloc(1, sizeof(struct preloaded_file)));
}

/*
 * Add a module to the chain
 */
static void
file_insert_tail(struct preloaded_file *fp)
{
        struct preloaded_file   *cm;
    
        /* Append to list of loaded file */
        fp->f_next = NULL;
        if (preloaded_files == NULL) {
                preloaded_files = fp;
        } else {
                for (cm = preloaded_files; cm->f_next != NULL; cm = cm->f_next)
                        ;
                cm->f_next = fp;
        }
}

/*
 * Remove module from the chain
 */
static void
file_remove_impl(struct preloaded_file *fp, bool keep_tail)
{
        struct preloaded_file   *cm, *next;

        if (preloaded_files == NULL)
                return;

        if (keep_tail)
                next = fp->f_next;
        else
                next = NULL;

        if (preloaded_files == fp) {
                preloaded_files = next;
                return;
        }

        for (cm = preloaded_files; cm->f_next != NULL; cm = cm->f_next) {
                if (cm->f_next == fp) {
                        cm->f_next = next;
                        return;
                }
        }
}

static void
file_remove(struct preloaded_file *fp)
{

        file_remove_impl(fp, true);
}

static void
file_remove_tail(struct preloaded_file *fp)
{

        file_remove_impl(fp, false);
}

static char *
moduledir_fullpath(struct moduledir *mdp, const char *fname)
{
        char *cp;

        cp = malloc(strlen(mdp->d_path) + strlen(fname) + 2);
        if (cp == NULL)
                return NULL;
        strcpy(cp, mdp->d_path);
        strcat(cp, "/");
        strcat(cp, fname);
        return (cp);
}

/*
 * Read linker.hints file into memory performing some sanity checks.
 */
static void
moduledir_readhints(struct moduledir *mdp)
{
        struct stat     st;
        char    *path;
        int             fd, size, version;

        if (mdp->d_hints != NULL || (mdp->d_flags & MDIR_NOHINTS))
                return;
        path = moduledir_fullpath(mdp, "linker.hints");
        if (stat(path, &st) != 0 ||
          st.st_size < (ssize_t)(sizeof(version) + sizeof(int)) ||
          st.st_size > LINKER_HINTS_MAX || (fd = open(path, O_RDONLY)) < 0) {
                free(path);
                mdp->d_flags |= MDIR_NOHINTS;
                return;
        }
        free(path);
        size = read(fd, &version, sizeof(version));
        if (size != sizeof(version) || version != LINKER_HINTS_VERSION)
                goto bad;
        size = st.st_size - size;
        mdp->d_hints = malloc(size);
        if (mdp->d_hints == NULL)
                goto bad;
        if (read(fd, mdp->d_hints, size) != size)
                goto bad;
        mdp->d_hintsz = size;
        close(fd);
        return;
bad:
        close(fd);
        free(mdp->d_hints);
        mdp->d_hints = NULL;
        mdp->d_flags |= MDIR_NOHINTS;
        return;
}

/*
 * Extract directories from the ';' separated list, remove duplicates.
 */
static void
moduledir_rebuild(void)
{
        struct  moduledir *mdp, *mtmp;
        const char      *path, *cp, *ep;
        size_t  cplen;

        path = getenv("module_path");
        if (path == NULL)
                path = default_searchpath;
        /*
         * Rebuild list of module directories if it changed
         */
        STAILQ_FOREACH(mdp, &moduledir_list, d_link)
                mdp->d_flags |= MDIR_REMOVED;

        for (ep = path; *ep != 0;  ep++) {
                cp = ep;
                for (; *ep != 0 && *ep != ';'; ep++)
                        ;
                /*
                 * Ignore trailing slashes
                 */
                for (cplen = ep - cp; cplen > 1 && cp[cplen - 1] == '/'; cplen--)
                        ;
                STAILQ_FOREACH(mdp, &moduledir_list, d_link) {
                        if (strlen(mdp->d_path) != cplen ||     bcmp(cp, mdp->d_path, cplen) != 0)
                                continue;
                        mdp->d_flags &= ~MDIR_REMOVED;
                        break;
                }
                if (mdp == NULL) {
                        mdp = malloc(sizeof(*mdp) + cplen + 1);
                        if (mdp == NULL)
                                return;
                        mdp->d_path = (char*)(mdp + 1);
                        bcopy(cp, mdp->d_path, cplen);
                        mdp->d_path[cplen] = 0;
                        mdp->d_hints = NULL;
                        mdp->d_flags = 0;
                        STAILQ_INSERT_TAIL(&moduledir_list, mdp, d_link);
                }
                if (*ep == 0)
                        break;
        }
        /*
         * Delete unused directories if any
         */
        mdp = STAILQ_FIRST(&moduledir_list);
        while (mdp) {
                if ((mdp->d_flags & MDIR_REMOVED) == 0) {
                        mdp = STAILQ_NEXT(mdp, d_link);
                } else {
                        free(mdp->d_hints);
                        mtmp = mdp;
                        mdp = STAILQ_NEXT(mdp, d_link);
                        STAILQ_REMOVE(&moduledir_list, mtmp, moduledir, d_link);
                        free(mtmp);
                }
        }
        return;
}