Remove the attic.

This commit is contained in:
David Given 2018-06-23 23:16:22 +02:00
parent 59dbdea48a
commit fd94e219d4
8 changed files with 0 additions and 747 deletions

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/*
closedir -- close a directory stream
last edit: 11-Nov-1988 D A Gwyn
*/
#include <errno.h>
#include <stdlib.h>
#include <sys/errno.h>
#include <sys/types.h>
#include <dirent.h>
typedef void* pointer; /* (void *) if you have it */
#ifndef NULL
#define NULL 0
#endif
int _close(int d);
int closedir(register DIR* dirp) /* stream from opendir */
{
register int fd;
if (dirp == NULL || dirp->dd_buf == NULL)
{
errno = EFAULT;
return -1; /* invalid pointer */
}
fd = dirp->dd_fd; /* bug fix thanks to R. Salz */
free((pointer)dirp->dd_buf);
free((pointer)dirp);
return _close(fd);
}

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/*
getdents -- get directory entries in a file system independent format
(SVR3 system call emulation)
last edit: 06-Jul-1987 D A Gwyn
This single source file supports several different methods of
getting directory entries from the operating system. Define
whichever one of the following describes your system:
UFS original UNIX filesystem (14-character name limit)
BFS 4.2BSD (also 4.3BSD) native filesystem (long names)
NFS getdirentries() system call
Also define any of the following that are pertinent:
ATT_SPEC check user buffer address for longword alignment
BSD_SYSV BRL UNIX System V emulation environment on 4.nBSD
UNK have _getdents() system call, but kernel may not
support it
If your C library has a getdents() system call interface, but you
can't count on all kernels on which your application binaries may
run to support it, change the system call interface name to
_getdents() and define "UNK" to enable the system-call validity
test in this "wrapper" around _getdents().
If your system has a getdents() system call that is guaranteed
to always work, you shouldn't be using this source file at all.
*/
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <sys/errno.h>
#include <sys/types.h>
#ifdef BSD_SYSV
#include <sys/_dir.h> /* BSD flavor, not System V */
#else
#if defined(UFS)
#define DIRSIZ 14 /* 14 char filename in Version 7 */
#endif
#define MAXNAMLEN 255
struct direct
{
off_t d_off; /* offset of next disk directory entry */
u_long d_fileno; /* file number of entry */
u_short d_reclen; /* length of this record */
u_short d_namlen; /* length of string in d_name */
char d_name[MAXNAMLEN + 1]; /* name (up to MAXNAMLEN + 1) */
};
#undef MAXNAMLEN /* avoid conflict with SVR3 */
#define d_ino d_fileno /* compatability */
#ifdef d_ino /* 4.3BSD/NFS using d_fileno */
#undef d_ino /* (not absolutely necessary) */
#else
#define d_fileno d_ino /* (struct direct) member */
#endif
#endif
#include <sys/dirent.h>
#include <sys/stat.h>
#ifdef UNK
#ifndef UFS
#error UNK applies only to UFS
/* One could do something similar for getdirentries(), but I didn't bother. */
#endif
#include <signal.h>
#endif
#if defined(UFS) + defined(BFS) + defined(NFS) != 1 /* sanity check */
#error exactly one of UFS, BFS, or NFS must be defined
#endif
#ifdef UFS
#define RecLen(dp) (sizeof(struct direct)) /* fixed-length entries */
#else /* BFS || NFS */
#define RecLen(dp) ((dp)->d_reclen) /* variable-length entries */
#endif
#ifdef NFS
#ifdef BSD_SYSV
#define getdirentries _getdirentries /* package hides this system call */
#endif
extern int getdirentries(int fd, char* buf, int nbytes, long* basep);
static long dummy; /* getdirentries() needs basep */
#define GetBlock(fd, buf, n) getdirentries(fd, buf, (unsigned)n, &dummy)
#else /* UFS || BFS */
#ifdef BSD_SYSV
#define read _read /* avoid emulation overhead */
#endif
extern int read();
#define GetBlock(fd, buf, n) read(fd, buf, (unsigned)n)
#endif
#ifdef UNK
extern int _getdents(); /* actual system call */
#endif
extern int _fstat(int fd, struct stat* buf);
extern off_t _lseek(int d, int offset, int whence);
#ifndef DIRBLKSIZ
#define DIRBLKSIZ 4096 /* directory file read buffer size */
#endif
#ifndef NULL
#define NULL 0
#endif
#ifndef SEEK_CUR
#define SEEK_CUR 1
#endif
#ifndef S_ISDIR /* macro to test for directory file */
#define S_ISDIR(mode) (((mode)&S_IFMT) == S_IFDIR)
#endif
#ifdef UFS
/*
The following routine is necessary to handle DIRSIZ-long entry names.
Thanks to Richard Todd for pointing this out.
*/
static int
NameLen(char name[]) /* return # chars in embedded name */
/* -> name embedded in struct direct */
{
register char* s; /* -> name[.] */
register char* stop = &name[DIRSIZ]; /* -> past end of name field */
for (s = &name[1]; /* (empty names are impossible) */
*s != '\0' /* not NUL terminator */
&& ++s < stop; /* < DIRSIZ characters scanned */
)
;
return s - name; /* # valid characters in name */
}
#else /* BFS || NFS */
#define NameLen(name) strlen(name) /* names are always NUL-terminated */
#endif
#ifdef UNK
static enum { maybe,
no,
yes } state
= maybe;
/* does _getdents() work? */
/*ARGSUSED*/
static void
sig_catch(int sig) /* sig must be SIGSYS */
{
state = no; /* attempted _getdents() faulted */
}
#endif
int getdents(int fildes, char* buf, unsigned nbyte) /* returns # bytes read;
0 on EOF, -1 on error */
/* fildes == directory file descriptor */
/* *buf == where to put the (struct dirent)s */
/* nbyte == size of buf[] */
{
int serrno; /* entry errno */
off_t offset; /* initial directory file offset */
struct stat statb; /* fstat() info */
union {
char dblk[DIRBLKSIZ];
/* directory file block buffer */
struct direct dummy; /* just for alignment */
} u; /* (avoids having to malloc()) */
register struct direct* dp; /* -> u.dblk[.] */
register struct dirent* bp; /* -> buf[.] */
#ifdef UNK
switch (state)
{
void (*shdlr)(); /* entry SIGSYS handler */
register int retval; /* return from _getdents() if any */
case yes: /* _getdents() is known to work */
return _getdents(fildes, buf, nbyte);
case maybe: /* first time only */
shdlr = signal(SIGSYS, sig_catch);
retval = _getdents(fildes, buf, nbyte); /* try it */
(void)signal(SIGSYS, shdlr);
if (state == maybe) /* SIGSYS did not occur */
{
state = yes; /* so _getdents() must have worked */
return retval;
}
/* else fall through into emulation */
/* case no:*/ /* fall through into emulation */
}
#endif
if (buf == NULL
#ifdef ATT_SPEC
|| (unsigned long)buf % sizeof(long) != 0 /* ugh */
#endif
)
{
errno = EFAULT; /* invalid pointer */
return -1;
}
if (_fstat(fildes, &statb) != 0)
return -1; /* errno set by fstat() */
if (!S_ISDIR(statb.st_mode))
{
errno = ENOTDIR; /* not a directory */
return -1;
}
if ((offset = _lseek(fildes, (off_t)0, SEEK_CUR)) < 0)
return -1; /* errno set by lseek() */
#ifdef BFS /* no telling what remote hosts do */
if ((unsigned long)offset % DIRBLKSIZ != 0)
{
errno = ENOENT; /* file pointer probably misaligned */
return -1;
}
#endif
serrno = errno; /* save entry errno */
for (bp = (struct dirent*)buf; bp == (struct dirent*)buf;)
{ /* convert next directory block */
int size;
do
size = GetBlock(fildes, u.dblk, DIRBLKSIZ);
while (size == -1 && errno == EINTR);
if (size <= 0)
return size; /* EOF or error (EBADF) */
for (dp = (struct direct*)u.dblk;
(char*)dp < &u.dblk[size];
dp = (struct direct*)((char*)dp + RecLen(dp)))
{
#ifndef UFS
if (dp->d_reclen <= 0)
{
errno = EIO; /* corrupted directory */
return -1;
}
#endif
if (dp->d_fileno != 0)
{ /* non-empty; copy to user buffer */
register int reclen = DIRENTSIZ(NameLen(dp->d_name));
if ((char*)bp + reclen > &buf[nbyte])
{
errno = EINVAL;
return -1; /* buf too small */
}
bp->d_ino = dp->d_fileno;
bp->d_off = offset + ((char*)dp - u.dblk);
bp->d_reclen = reclen;
(void)strncpy(bp->d_name, dp->d_name,
reclen - DIRENTBASESIZ); /* adds NUL padding */
bp = (struct dirent*)((char*)bp + reclen);
}
}
#ifndef BFS /* 4.2BSD screwed up; fixed in 4.3BSD */
if ((char*)dp > &u.dblk[size])
{
errno = EIO; /* corrupted directory */
return -1;
}
#endif
}
errno = serrno; /* restore entry errno */
return (char*)bp - buf; /* return # bytes read */
}

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/*
* getgrent - get entry form group file
*
* Author: Patrick van Kleef
*/
/* $Id$ */
#include <stdlib.h>
#include <string.h>
#include <grp.h>
#define O_RDONLY 0
int open(const char* path, int flags);
#if defined(__BSD4_2)
typedef int off_t; /* see lseek(2) */
#else
typedef long off_t;
#endif
off_t _lseek(int d, off_t offset, int whence);
int _read(int d, char* buf, int nbytes);
int _close(int d);
#define RBUFSIZE 1024
static char _gr_file[] = "/etc/group";
static char _grbuf[256];
static char _buffer[RBUFSIZE];
static char* _pnt;
static char* _buf;
static int _gfd = -1;
static int _bufcnt;
static struct group grp;
int setgrent(void)
{
if (_gfd >= 0)
_lseek(_gfd, 0L, 0);
else
_gfd = open(_gr_file, O_RDONLY);
_bufcnt = 0;
return _gfd;
}
void endgrent(void)
{
if (_gfd >= 0)
_close(_gfd);
_gfd = -1;
_bufcnt = 0;
}
static int
getline(void)
{
if (_gfd < 0 && setgrent() < 0)
return 0;
_buf = _grbuf;
do
{
if (--_bufcnt <= 0)
{
if ((_bufcnt = _read(_gfd, _buffer, RBUFSIZE)) <= 0)
return 0;
else
_pnt = _buffer;
}
*_buf++ = *_pnt++;
} while (*_pnt != '\n');
_pnt++;
_bufcnt--;
*_buf = 0;
_buf = _grbuf;
return 1;
}
static void
skip_period(void)
{
while (*_buf && *_buf != ':')
_buf++;
*_buf++ = '\0';
}
struct group*
getgrent(void)
{
if (getline() == 0)
return 0;
grp.gr_name = _buf;
skip_period();
grp.gr_passwd = _buf;
skip_period();
grp.gr_gid = atoi(_buf);
skip_period();
return &grp;
}
struct group*
getgrnam(const char* name)
{
struct group* g;
setgrent();
while ((g = getgrent()) != 0)
if (!strcmp(g->gr_name, name))
break;
endgrent();
if (g != 0)
return g;
else
return 0;
}
struct group*
getgrgid(int gid)
{
struct group* g;
setgrent();
while ((g = getgrent()) != 0)
if (g->gr_gid == gid)
break;
endgrent();
if (g != 0)
return g;
else
return 0;
}

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/*
opendir -- open a directory stream
last edit: 16-Jun-1987 D A Gwyn
*/
#include <errno.h>
#include <stdlib.h>
#include <sys/errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
typedef void* pointer; /* (void *) if you have it */
extern int _open(const char* path, int flags, int mode);
extern int _close(int d);
extern int _fstat(int fd, struct stat* buf);
#ifndef NULL
#define NULL 0
#endif
#ifndef O_RDONLY
#define O_RDONLY 0
#endif
#ifndef S_ISDIR /* macro to test for directory file */
#define S_ISDIR(mode) (((mode)&S_IFMT) == S_IFDIR)
#endif
DIR* opendir(const char* dirname) /* name of directory */
{
register DIR* dirp; /* -> malloc'ed storage */
register int fd; /* file descriptor for read */
struct stat sbuf; /* result of fstat() */
if ((fd = _open(dirname, O_RDONLY, 0)) < 0)
return NULL; /* errno set by open() */
if (_fstat(fd, &sbuf) != 0 || !S_ISDIR(sbuf.st_mode))
{
(void)_close(fd);
errno = ENOTDIR;
return NULL; /* not a directory */
}
if ((dirp = (DIR*)malloc(sizeof(DIR))) == NULL
|| (dirp->dd_buf = (char*)malloc((unsigned)DIRBUF)) == NULL)
{
register int serrno = errno;
/* errno set to ENOMEM by sbrk() */
if (dirp != NULL)
free((pointer)dirp);
(void)_close(fd);
errno = serrno;
return NULL; /* not enough memory */
}
dirp->dd_fd = fd;
dirp->dd_loc = dirp->dd_size = 0; /* refill needed */
return dirp;
}

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/*
readdir -- read next entry from a directory stream
last edit: 25-Apr-1987 D A Gwyn
*/
#include <errno.h>
#include <sys/errno.h>
#include <sys/types.h>
#include <dirent.h>
/* SVR3 system call, or emulation for getdents() */
extern int getdents(int fildes, char* buf, unsigned nbyte);
#ifndef NULL
#define NULL 0
#endif
struct dirent*
readdir(register DIR* dirp)
{
register struct dirent* dp; /* -> directory data */
if (dirp == NULL || dirp->dd_buf == NULL)
{
errno = EFAULT;
return NULL; /* invalid pointer */
}
do
{
if (dirp->dd_loc >= dirp->dd_size) /* empty or obsolete */
dirp->dd_loc = dirp->dd_size = 0;
if (dirp->dd_size == 0 /* need to refill buffer */
&& (dirp->dd_size = getdents(dirp->dd_fd, dirp->dd_buf, (unsigned)DIRBUF)) <= 0)
return NULL; /* EOF or error */
dp = (struct dirent*)&dirp->dd_buf[dirp->dd_loc];
dirp->dd_loc += dp->d_reclen;
} while (dp->d_ino == 0L); /* don't rely on getdents() */
return dp;
}

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/*
rewinddir -- rewind a directory stream
last edit: 25-Apr-1987 D A Gwyn
This is not simply a call to seekdir(), because seekdir()
will use the current buffer whenever possible and we need
rewinddir() to forget about buffered data.
*/
#include <errno.h>
#include <sys/errno.h>
#include <sys/types.h>
#include <dirent.h>
extern off_t _lseek(int d, int offset, int whence);
#ifndef NULL
#define NULL 0
#endif
#ifndef SEEK_SET
#define SEEK_SET 0
#endif
void rewinddir(register DIR* dirp)
{
if (dirp == NULL || dirp->dd_buf == NULL)
{
errno = EFAULT;
return; /* invalid pointer */
}
dirp->dd_loc = dirp->dd_size = 0; /* invalidate buffer */
(void)_lseek(dirp->dd_fd, (off_t)0, SEEK_SET); /* may set errno */
}

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/*
seekdir -- reposition a directory stream
last edit: 24-May-1987 D A Gwyn
An unsuccessful seekdir() will in general alter the current
directory position; beware.
NOTE: 4.nBSD directory compaction makes seekdir() & telldir()
practically impossible to do right. Avoid using them!
*/
#include <errno.h>
#include <sys/errno.h>
#include <sys/types.h>
#include <dirent.h>
extern off_t _lseek(int d, int offset, int whence);
#ifndef NULL
#define NULL 0
#endif
#ifndef SEEK_SET
#define SEEK_SET 0
#endif
typedef int bool; /* Boolean data type */
#define false 0
#define true 1
void seekdir(register DIR* dirp, register off_t loc)
/* loc == position from telldir() */
{
register bool rewind; /* "start over when stymied" flag */
if (dirp == NULL || dirp->dd_buf == NULL)
{
errno = EFAULT;
return; /* invalid pointer */
}
/* A (struct dirent)'s d_off is an invented quantity on 4.nBSD
NFS-supporting systems, so it is not safe to lseek() to it. */
/* Monotonicity of d_off is heavily exploited in the following. */
/* This algorithm is tuned for modest directory sizes. For
huge directories, it might be more efficient to read blocks
until the first d_off is too large, then back up one block,
or even to use binary search on the directory blocks. I
doubt that the extra code for that would be worthwhile. */
if (dirp->dd_loc >= dirp->dd_size /* invalid index */
|| ((struct dirent*)&dirp->dd_buf[dirp->dd_loc])->d_off > loc
/* too far along in buffer */
)
dirp->dd_loc = 0; /* reset to beginning of buffer */
/* else save time by starting at current dirp->dd_loc */
for (rewind = true;;)
{
register struct dirent* dp;
/* See whether the matching entry is in the current buffer. */
if ((dirp->dd_loc < dirp->dd_size /* valid index */
|| readdir(dirp) != NULL /* next buffer read */
&& (dirp->dd_loc = 0, true) /* beginning of buffer set */
)
&& (dp = (struct dirent*)&dirp->dd_buf[dirp->dd_loc])->d_off
<= loc /* match possible in this buffer */
)
{
for (/* dp initialized above */;
(char*)dp < &dirp->dd_buf[dirp->dd_size];
dp = (struct dirent*)((char*)dp + dp->d_reclen))
if (dp->d_off == loc)
{ /* found it! */
dirp->dd_loc = (char*)dp - dirp->dd_buf;
return;
}
rewind = false; /* no point in backing up later */
dirp->dd_loc = dirp->dd_size; /* set end of buffer */
}
else /* whole buffer past matching entry */
if (!rewind)
{ /* no point in searching further */
errno = EINVAL;
return; /* no entry at specified loc */
}
else
{ /* rewind directory and start over */
rewind = false; /* but only once! */
dirp->dd_loc = dirp->dd_size = 0;
if (_lseek(dirp->dd_fd, (off_t)0, SEEK_SET)
!= 0)
return; /* errno already set (EBADF) */
if (loc == 0)
return; /* save time */
}
}
}

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/*
telldir -- report directory stream position
last edit: 25-Apr-1987 D A Gwyn
NOTE: 4.nBSD directory compaction makes seekdir() & telldir()
practically impossible to do right. Avoid using them!
*/
#include <errno.h>
#include <sys/errno.h>
#include <sys/types.h>
#include <dirent.h>
extern off_t _lseek(int d, int offset, int whence);
#ifndef SEEK_CUR
#define SEEK_CUR 1
#endif
off_t telldir(register DIR* dirp) /* return offset of next entry */
{
if (dirp == NULL || dirp->dd_buf == NULL)
{
errno = EFAULT;
return -1; /* invalid pointer */
}
if (dirp->dd_loc < dirp->dd_size) /* valid index */
return ((struct dirent*)&dirp->dd_buf[dirp->dd_loc])->d_off;
else /* beginning of next directory block */
return _lseek(dirp->dd_fd, (off_t)0, SEEK_CUR);
}