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/*

 * opendir.c --

 *

 *      This file provides dirent-style directory-reading procedures

 *      for V7 Unix systems that don't have such procedures.  The

 *      origin of this code is unclear, but it seems to have come

 *      originally from Larry Wall.

 *

 *

 * RCS: @(#) $Id: opendir.c,v 1.1.1.1 2002-01-16 10:25:23 markom Exp $

 */

#include "tclInt.h"

#include "tclPort.h"

#undef DIRSIZ

#define DIRSIZ(dp) \

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

/*

 * open a directory.

 */

DIR *

opendir(name)

char *name;

{

        register DIR *dirp;

        register int fd;

        char *myname;

        myname = ((*name == '\0') ? "." : name);

        if ((fd = open(myname, 0, 0)) == -1)

                return NULL;

        if ((dirp = (DIR *)ckalloc(sizeof(DIR))) == NULL) {

                close (fd);

                return NULL;

        }

        dirp->dd_fd = fd;

        dirp->dd_loc = 0;

        return dirp;

}

/*

 * read an old style directory entry and present it as a new one

 */

#ifndef pyr

#define ODIRSIZ 14

struct  olddirect {

        ino_t   od_ino;

        char    od_name[ODIRSIZ];

};

#else   /* a Pyramid in the ATT universe */

#define ODIRSIZ 248

struct  olddirect {

        long    od_ino;

        short   od_fill1, od_fill2;

        char    od_name[ODIRSIZ];

};

#endif

/*

 * get next entry in a directory.

 */

struct dirent *

readdir(dirp)

register DIR *dirp;

{

        register struct olddirect *dp;

        static struct dirent dir;

        for (;;) {

                if (dirp->dd_loc == 0) {

                        dirp->dd_size = read(dirp->dd_fd, dirp->dd_buf,

                            DIRBLKSIZ);

                        if (dirp->dd_size <= 0)

                                return NULL;

                }

                if (dirp->dd_loc >= dirp->dd_size) {

                        dirp->dd_loc = 0;

                        continue;

                }

                dp = (struct olddirect *)(dirp->dd_buf + dirp->dd_loc);

                dirp->dd_loc += sizeof(struct olddirect);

                if (dp->od_ino == 0)

                        continue;

                dir.d_ino = dp->od_ino;

                strncpy(dir.d_name, dp->od_name, ODIRSIZ);

                dir.d_name[ODIRSIZ] = '\0'; /* insure null termination */

                dir.d_namlen = strlen(dir.d_name);

                dir.d_reclen = DIRSIZ(&dir);

                return (&dir);

        }

}

/*

 * close a directory.

 */

void

closedir(dirp)

register DIR *dirp;

{

        close(dirp->dd_fd);

        dirp->dd_fd = -1;

        dirp->dd_loc = 0;

        ckfree((char *) dirp);

}