sl@0: /* 
sl@0:  * opendir.c --
sl@0:  *
sl@0:  *	This file provides dirent-style directory-reading procedures
sl@0:  *	for V7 Unix systems that don't have such procedures.  The
sl@0:  *	origin of this code is unclear, but it seems to have come
sl@0:  *	originally from Larry Wall.
sl@0:  *
sl@0:  *
sl@0:  * RCS: @(#) $Id: opendir.c,v 1.2 1998/09/14 18:39:44 stanton Exp $
sl@0:  */
sl@0: 
sl@0: #include "tclInt.h"
sl@0: #include "tclPort.h"
sl@0: 
sl@0: #undef DIRSIZ
sl@0: #define DIRSIZ(dp) \
sl@0:     ((sizeof (struct dirent) - (MAXNAMLEN+1)) + (((dp)->d_namlen+1 + 3) &~ 3))
sl@0: 
sl@0: /*
sl@0:  * open a directory.
sl@0:  */
sl@0: DIR *
sl@0: opendir(name)
sl@0: char *name;
sl@0: {
sl@0: 	register DIR *dirp;
sl@0: 	register int fd;
sl@0: 	char *myname;
sl@0: 
sl@0: 	myname = ((*name == '\0') ? "." : name);
sl@0: 	if ((fd = open(myname, 0, 0)) == -1)
sl@0: 		return NULL;
sl@0: 	if ((dirp = (DIR *)ckalloc(sizeof(DIR))) == NULL) {
sl@0: 		close (fd);
sl@0: 		return NULL;
sl@0: 	}
sl@0: 	dirp->dd_fd = fd;
sl@0: 	dirp->dd_loc = 0;
sl@0: 	return dirp;
sl@0: }
sl@0: 
sl@0: /*
sl@0:  * read an old style directory entry and present it as a new one
sl@0:  */
sl@0: #ifndef pyr
sl@0: #define	ODIRSIZ	14
sl@0: 
sl@0: struct	olddirect {
sl@0: 	ino_t	od_ino;
sl@0: 	char	od_name[ODIRSIZ];
sl@0: };
sl@0: #else	/* a Pyramid in the ATT universe */
sl@0: #define	ODIRSIZ	248
sl@0: 
sl@0: struct	olddirect {
sl@0: 	long	od_ino;
sl@0: 	short	od_fill1, od_fill2;
sl@0: 	char	od_name[ODIRSIZ];
sl@0: };
sl@0: #endif
sl@0: 
sl@0: /*
sl@0:  * get next entry in a directory.
sl@0:  */
sl@0: struct dirent *
sl@0: readdir(dirp)
sl@0: register DIR *dirp;
sl@0: {
sl@0: 	register struct olddirect *dp;
sl@0: 	static struct dirent dir;
sl@0: 
sl@0: 	for (;;) {
sl@0: 		if (dirp->dd_loc == 0) {
sl@0: 			dirp->dd_size = read(dirp->dd_fd, dirp->dd_buf,
sl@0: 			    DIRBLKSIZ);
sl@0: 			if (dirp->dd_size <= 0)
sl@0: 				return NULL;
sl@0: 		}
sl@0: 		if (dirp->dd_loc >= dirp->dd_size) {
sl@0: 			dirp->dd_loc = 0;
sl@0: 			continue;
sl@0: 		}
sl@0: 		dp = (struct olddirect *)(dirp->dd_buf + dirp->dd_loc);
sl@0: 		dirp->dd_loc += sizeof(struct olddirect);
sl@0: 		if (dp->od_ino == 0)
sl@0: 			continue;
sl@0: 		dir.d_ino = dp->od_ino;
sl@0: 		strncpy(dir.d_name, dp->od_name, ODIRSIZ);
sl@0: 		dir.d_name[ODIRSIZ] = '\0'; /* insure null termination */
sl@0: 		dir.d_namlen = strlen(dir.d_name);
sl@0: 		dir.d_reclen = DIRSIZ(&dir);
sl@0: 		return (&dir);
sl@0: 	}
sl@0: }
sl@0: 
sl@0: /*
sl@0:  * close a directory.
sl@0:  */
sl@0: void
sl@0: closedir(dirp)
sl@0: register DIR *dirp;
sl@0: {
sl@0: 	close(dirp->dd_fd);
sl@0: 	dirp->dd_fd = -1;
sl@0: 	dirp->dd_loc = 0;
sl@0: 	ckfree((char *) dirp);
sl@0: }