rrn@lib.tmc.edu (Stan Barber) (11/26/90)
/* $Header: ndir.c,v 4.3.1.6 90/11/22 16:08:50 sob Exp $
*
* $Log: ndir.c,v $
* Revision 4.3.1.6 90/11/22 16:08:50 sob
* Added changes to accomodate pick C preprocessors.
*
* Revision 4.3.1.5 90/03/22 23:04:47 sob
* Fixes provided by Wayne Davison <drivax!davison>
*
* Revision 4.3.1.3 85/05/23 11:19:24 lwall
* Oops, shouldn't have included sys/types.h again.
*
* Revision 4.3.1.2 85/05/15 14:46:00 lwall
* Changed short to ino_t, which may be ushort on some systems.
*
* Revision 4.3.1.1 85/05/10 11:35:34 lwall
* Branch for patches.
*
* Revision 4.3 85/05/01 11:42:55 lwall
* Baseline for release with 4.3bsd.
*
*/
#include "EXTERN.h"
#include "common.h"
#include "INTERN.h"
#include "ndir.h"
#ifdef USENDIR
/*
* support for Berkeley directory reading routine on a V7 file system
*/
/*
* open a directory.
*/
DIR *
opendir(name)
char *name;
{
register DIR *dirp;
register int fd;
char *malloc();
if ((fd = open(name, 0)) == -1)
return NULL;
if ((dirp = (DIR *)malloc(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 an 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 direct *
readdir(dirp)
register DIR *dirp;
{
register struct olddirect *dp;
static struct direct 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;
free(dirp);
}
#endif /* USENDIR */