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/*

 * Copyright (c) 1983 Regents of the University of California.

 * 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.

 * 3. All advertising materials mentioning features or use of this software

 *    must display the following acknowledgement:

 *      This product includes software developed by the University of

 *      California, Berkeley and its contributors.

 * 4. Neither the name of the University nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.

 */

#if defined(LIBC_SCCS) && !defined(lint)

static char sccsid[] = "@(#)scandir.c   5.10 (Berkeley) 2/23/91";

#endif /* LIBC_SCCS and not lint */

/*

 * Scan the directory dirname calling select to make a list of selected

 * directory entries then sort using qsort and compare routine dcomp.

 * Returns the number of entries and a pointer to a list of pointers to

 * struct dirent (through namelist). Returns -1 if there were any errors.

 */

#include <sys/types.h>

#include <sys/stat.h>

#include <dirent.h>

#include <stdlib.h>

#include <string.h>

/*

 * The DIRSIZ macro gives the minimum record length which will hold

 * the directory entry.  This requires the amount of space in struct dirent

 * without the d_name field, plus enough space for the name with a terminating

 * null byte (dp->d_namlen+1), rounded up to a 4 byte boundary.

 */

#undef DIRSIZ

#define DIRSIZ(dp) \

    ((sizeof (struct dirent) - (MAXNAMLEN+1)) + (((dp)->d_namlen+1 + 3) &~ 3))

#ifndef __P

#define __P(args) ()

#endif

int

scandir(dirname, namelist, select, dcomp)

        const char *dirname;

        struct dirent ***namelist;

        int (*select) __P((struct dirent *));

        int (*dcomp) __P((const void *, const void *));

{

        register struct dirent *d, *p, **names;

        register size_t nitems;

        struct stat stb;

        long arraysz;

        DIR *dirp;

        if ((dirp = opendir(dirname)) == NULL)

                return(-1);

        if (fstat(dirp->dd_fd, &stb) < 0)

                return(-1);

        /*

         * estimate the array size by taking the size of the directory file

         * and dividing it by a multiple of the minimum size entry.

         */

        arraysz = (stb.st_size / 24);

        names = (struct dirent **)malloc(arraysz * sizeof(struct dirent *));

        if (names == NULL)

                return(-1);

        nitems = 0;

        while ((d = readdir(dirp)) != NULL) {

                if (select != NULL && !(*select)(d))

                        continue;       /* just selected names */

                /*

                 * Make a minimum size copy of the data

                 */

                p = (struct dirent *)malloc(DIRSIZ(d));

                if (p == NULL)

                        return(-1);

                p->d_ino = d->d_ino;

                p->d_reclen = d->d_reclen;

                p->d_namlen = d->d_namlen;

                bcopy(d->d_name, p->d_name, p->d_namlen + 1);

                /*

                 * Check to make sure the array has space left and

                 * realloc the maximum size.

                 */

                if (++nitems >= arraysz) {

                        if (fstat(dirp->dd_fd, &stb) < 0)

                                return(-1);     /* just might have grown */

                        arraysz = stb.st_size / 12;

                        names = (struct dirent **)realloc((char *)names,

                                arraysz * sizeof(struct dirent *));

                        if (names == NULL)

                                return(-1);

                }

                names[nitems-1] = p;

        }

        closedir(dirp);

        if (nitems && dcomp != NULL)

                qsort(names, nitems, sizeof(struct dirent *), dcomp);

        *namelist = names;

        return(nitems);

}

/*

 * Alphabetic order comparison routine for those who want it.

 */

int

alphasort(d1, d2)

        const void *d1;

        const void *d2;

{

        return(strcmp((*(struct dirent **)d1)->d_name,

            (*(struct dirent **)d2)->d_name));

}