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/* ndir.c
*/
/* This software is copyrighted as detailed in the LICENSE file. */
#include "EXTERN.h"
#include "common.h"
#include "INTERN.h"
#include "ndir.h"
#ifdef EMULATE_NDIR
/*
* 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.
*/
Direntry_t*
readdir(dirp)
register DIR* dirp;
{
register struct olddirect* dp;
static Direntry_t 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 /* EMULATE_NDIR */
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